King County Lower Duwamish Waterway Source Control Annual Report Year 2017
December 2018
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King County Lower Duwamish Waterway Source Control Annual Report Year 2017
Prepared for: Washington State Department of Ecology
Submitted by: King County Department of Natural Resources and Parks King County Department of Transportation King County Department of Executive Services
For more information contact: Debra Williston Water and Land Resources Division King County Department of Natural Resources and Parks 201 S. Jackson St. Seattle, WA 98104-3855 [email protected]
This information is available in alternative formats upon request at 206-477-5371 (voice) or 711 (TTY)
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King County Lower Duwamish Waterway Source Control Annual Report - 2017
ACKNOWLEDGMENTS A team of representatives from the King County Wastewater Treatment Division, Water and Land Resources Division, King County International Airport, Roads Services Division,
Permitting and Environmental Review, and Local Hazardous Waste Management Program Facilitiesall contributed Management to the production Division, Public of this Health−Seattle report. The production & King County, was managed Department and of coordinated by Debra Williston of the Water and Land Resources Division, Science and Technical Support Section.
CITATION
King County. 2018. King County Lower Duwamish Waterway Source Control Annual Report-Year 2017. Prepared by Department of Natural Resources and Parks, Department of Transportation, and Department of Executive Services. Seattle, Washington.
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King County Lower Duwamish Waterway Source Control Annual Report - 2017
TABLE OF CONTENTS
Acknowledgments ...... i Citation ...... i Table of Contents ...... ii Figures ...... iv Tables...... iv Appendices ...... iv Acronyms ...... v Executive Summary...... vi 1.0 Introduction ...... 1 1.1 LDW Source Control Area ...... 1 1.2 Internal Coordination Efforts ...... 1 2.0 Wastewater Treatment Division ...... 3 2.1 CSO Control Program ...... 3 2.2 RainWise Program ...... 3 2.3 WaterWorks Grant Funding ...... 4 2.4 Industrial Waste Program ...... 6 2.4.1 Listing of Industrial Users ...... 7 2.4.2 Listing of Inspections ...... 7 2.4.3 Collaborations ...... 7 2.4.4 Special Studies and Incident Responses ...... 7 2.5 Sediment Management Program ...... 9 2.5.1 Source Tracing Activities ...... 9 2.5.2 Summary of Source Control Studies ...... 12 2.5.3 Summary of Regulatory Review Actions ...... 13 3.0 Water and Land Resources Division ...... 14 3.1 Stormwater Services ...... 14 3.1.1 Mapping Updates ...... 14 3.1.2 Business Inspections ...... 14 3.1.3 Participation in Duwamish Inspectors Group ...... 17
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3.1.4 Source Tracing Activities ...... 17 3.2 Local Hazardous Waste Management Program ...... 18 4.0 Department of Transportation ...... 20 4.1 King County International Airport ...... 20 4.1.1 Industrial Stormwater General Permit Compliance...... 20 4.1.2 MS4 Permit Compliance ...... 22 4.1.3 Source Tracing Activities and Remediation ...... 23 4.2 Roads Services Division ...... 28 5.0 Other King County Departments and Divisions ...... 29 5.1 Facilities Management Division ...... 29 5.2 Department of Permitting and Environmental Review ...... 30 5.3 Environmental Health Services Division ...... 31 5.3.1 Public Health– ...... 31 5.3.2 Public Health -Site Wastewater Program ...... 35 –Seattle & King County Solid Waste Program 5.4 Solid Waste Division ...... 36 Seattle & King County On 6.0 References ...... 38
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FIGURES
Figure 1. Lower Duwamish Waterway Source Control Area...... 2 Figure 2. Sites with Regulatory Oversight by Public Health– Solid Waste Program...... 33 Seattle & King County
TABLES
Summary of King County CSO Control Project Milestones in the LDW for 2017...... 3 Summary of Source Tracing Samples Collected from the Combined Sewer System (2016 and 2017)...... 10 Business Source Control Inspection Results...... 15 Water Quality Complaint Investigations in 2017...... 17 LHWMP Site Visits in 2017 in the LDW Drainage Area...... 19 ISGP Discharge Monitoring Data Annual Averages for 2017...... 21 KCIA Tenants and ISGP Numbers...... 22 Number of Source Tracing Samples Collected from KCIA Source Control Areas in 2017...... 23 DPER Permitting/Inspection Activity in 2016...... 30 Solid Waste Facilities in the LDW Drainage Basin Permitted by Public Health in 2017...... 34
APPENDICES Appendix A: KCIW Industrial Users Appendix B: WTD Source Tracing Combined Sewer Solids Dataset Appendix C: SWS Source Tracing Storm Drain Solids Dataset Appendix D: KCIA Maps Appendix E: KCIA Source Tracing Storm Drain Solids Dataset
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ACRONYMS BMPs best management practices BEHP bis(2-ethylhexyl)phthalate BBP butyl benzyl phthalate CSL cleanup screening level CSO combined sewer overflow CA consistent attainment DPER Department of Permitting and Environmental Review ECOSS Environmental Coalition of South Seattle ERTS Environmental Report Tracking System FMD Facilities Management Division HPAHs high molecular weight polycyclic aromatic hydrocarbons ISGP Industrial Stormwater General Permit KCIW King County Industrial Waste KCIA King County International Airport LHWMP Local Hazardous Waste Management Program LPAHs low molecular weight polycyclic aromatic hydrocarbons LDW Lower Duwamish Waterway LAET lowest apparent effects threshold MTCA Model Toxics Control Act MS4 municipal separate storm sewer system NPDES National Pollutant Discharge Elimination System NBF North Boeing Field NTU nephelometric turbidity units OWS oil–water separator PCBs polychlorinated biphenyls PAHs polycyclic aromatic hydrocarbons SDOT Seattle Department of Transportation SPU Seattle Public Utilities SQS sediment quality standard SIU significant industrial user SCIP Source Control Implementation Plan SPS South Pump Station SWS Stormwater Services Section SBC SuttonBeresCuller TSS total suspended solids EPA U.S. Environmental Protection Agency Ecology Washington State Department of Ecology WTD Wastewater Treatment Division WLRD Water and Land Resources Division
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EXECUTIVE SUMMARY King County developed a Source Control Implementation Plan in support of the Lower Duwamish Waterway (LDW) Superfund site cleanup. The LDW source control area is comprised of individual combined sewer and stormwater drainage areas that discharge to the LDW Superfund site. The County’s plan includes a continued commitment to: • implementing planned combined sewer overflow (CSO) control projects to complete control of all CSOs in the LDW; • regulating and monitoring industrial dischargers to the portions of the regional wastewater system that have releases to the LDW; • implementing planned combined sewer overflow (CSO) control projects; managing the implementation of the County’s NPDES Phase I Municipal Stormwater Permit; • providing technical and educational programs for businesses and residents on ways to prevent pollutants from entering the LDW; • conducting scientific assessments, sampling, source tracing, and system mapping; and • committing to full compliance with water and air quality permits and regulations at County-owned and operated facilities. The County reports its source control related activities within LDW drainage basin through annual reports submitted to Washington Department of Ecology. This report summarizes County’s source control activities conducted in 2017 by various County departments and divisions with most activities being conducted by: the Wastewater Treatment Division, Water and Land Resources Division, King County International Airport, and Roads Services Division. All planned source control actions were completed in 2017.
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King County Lower Duwamish Waterway Source Control Annual Report - 2017
1.0 INTRODUCTION This report summarizes King County’s (County) Lower Duwamish Waterway (LDW) source control activities in 2017. It is the third annual report that documents implementation of actions outlined in the County’s LDW Source Control Implementation Plan (SCIP) for 2014 to 2018 (King County 2016a).1
The SCIP does the following:
• Identifies actions within the County’s authority that are needed to sufficiently control existing sources of contaminants to the LDW to begin sediment cleanup in the waterway.
• Strives to minimize the risk of recontaminating sediments after sediment cleanup to levels above the sediment cleanup standards established in the U.S. Environmental Protection Agency’s (EPA) Record of Decision for the LDW Superfund site (EPA 2014).
• Supports the Washington State Department of Ecology’s (Ecology) LDW Source Control Strategy Plan (Ecology 2016) and implementation of EPA’s Record of Decision for the LDW Superfund site. This annual report is organized according to the County departments and divisions specified in the SCIP.
1.1 LDW Source Control Area The LDW source control area is comprised of individual drainage areas that discharge to the LDW Superfund site (Figure 1). The area includes (1) King County and Seattle Public Utilities (SPU) combined sewer overflow (CSO) basins and (2) separated stormwater basins that are the responsibility of King County and the cities of Seattle, Tukwila, Burien, and SeaTac. This annual report covers actions in combined sewer basins associated with County CSO outfalls, County separated storm sewer basins that drain to the LDW, and County properties in the LDW source control area.
1.2 Internal Coordination Efforts Most of King County’s responsibility for LDW source control rests with four County divisions: the Wastewater Treatment Division (WTD), Water and Land Resources Division (WLRD), King County International Airport (KCIA), and Roads Services Division. In 2017,
1 King County provided previous source control updates to the LDW Source Control Work Group and to the reports can be found at http://www.ecy.wa.gov/programs/tcp/sites_brochure/lower_duwamish/source_control/sc.htmlWashington State Department of Ecology’s LDW Source Control Status Reports (2003−2013). The .status
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biannual meetings were held to discuss and coordinate source control efforts across County divisions and departments. These meetings included representatives from the divisions listed above as well as other County agencies and departments (i.e., Facilities Management Division [FMD], Solid Waste Division [SWD], Public Health−Seattle King County (Public Health), Department of Permitting and Environmental Review [DPER], and Local Hazardous Waste Management Program [LHWMP]). &
Figure 1. LDW Source Control Area.
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2.0 WASTEWATER TREATMENT DIVISION This section summarizes source control actions taken by WTD in the LDW drainage area during 2017.
2.1 CSO Control Program
WTD is responsible for managing King County’s regional wastewater system. WTD’s CSO Control Program fulfills requirements under the National Pollutant Discharge Elimination System (NPDES) permit for the County’s West Point Treatment Plant (WA0029181) in Seattle and requirements in Washington Administrative Code 173-245-090. The most recent West Point NPDES permit was issued on December 19, 2014, and became effective on February 1, 2015.
The County’s previous investments in CSO control have significantly reduced CSO volumes and pollutant loads into Seattle-area waterways. Three CSO control projects are currently underway in the LDW. The projects, estimated to cost $334.4 million (2017 dollars), are (1) West Duwamish Wet Weather Storage (West Michigan and Terminal 115 CSOs), (2) Georgetown Wet Weather Treatment Station (Georgetown WWTS; Brandon and South Michigan [S Michigan] CSOs), and (3) Rainier Valley Wet Weather Storage and conveyance improvements (Hanford #1 CSO). These three projects will control the remaining uncontrolled County CSOs in the LDW to the state standard of no more than one untreated CSO discharge on average per year at each outfall, and will remove most of the untreated CSOs in the LDW. The projects are currently in design or construction phases and are anticipated to be in operation by 2030. Table 1 summarizes progress made in 2017 to meet project milestones.
Summary of King County CSO Control Project Milestones in the LDW for 2017. Discharge Project Name (Status) Serial Milestone Deadline Milestone Completed Number Georgetown WWTS Construction completion Completed bidding 039, 041 (construction) by December 2022 December 2017 Rainier Valley Wet 031a, 031b, Construction completion Completed bidding May Weather Storage 031c by December 2019 2016 (construction) West Duwamish Submit facility plan by 038, 044 In progress (predesign) December 2020
2.2 RainWise Program Since 2010, King County, in partnership with the City of Seattle, has administered the RainWise program, which provides rebates to homeowners living in specific combined
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sewer areas for installing rain gardens and cisterns on their properties. RainWise helps to slow, detain, or retain stormwater, reducing both the volume and timing of CSOs and sources of pollution into the combined system. The program is underway in the neighborhoods of South Park and Highland Park. To date, RainWise installations in these two neighborhoods are capturing stormwater from 115,616 square feet (2.65 acres) of roof area and removing approximately 1.3 million gallons of stormwater from the combined sewer system.
2.3 WaterWorks Grant Funding King County established the WaterWorks Grant Program to promote source control partnerships, develop local expertise in water quality protection, and enhance economic opportunities in the community. The program funds projects undertaken by organizations and agencies to improve water quality. These projects support the success of King County’s CSO control projects by controlling new and ongoing sources of pollution that could harm the environment or recontaminate cleaned-up areas in the LDW and by reducing the volume and timing of CSOs.
In 2017, King County awarded funding to 45 projects through WaterWorks competitive and Council-allocated grants. Of that number, 19 projects totaling $1,557,869 take place entirely or include activities in the Green/Duwamish Watershed. All funded projects have water quality benefits, focusing on source control through green stormwater infrastructure, education and community engagement, or stream and river bank restoration activities. The 19 projects awarded funding that affect the Green/Duwamish Watershed are as follows:
1. City of Covington: Timberlane Estates Drainage Project Sites ($70,000). Improve existing stormwater collection, conveyance, and treatment systems; install new low impact development treatment facilities and additional flow control. 2. City of Kent: Green River Watershed Center, Design & Analysis ($50,000). Complete a feasibility, use, and program plan for a new watershed education center at the Green River Natural Resources Area in Kent. 3. City of Kent: Lake Fenwick Aerator Upgrade and Alum Treatment ($89,000). Plan, permit, and construct a new aeration system to improve water quality in Lake Fenwick. 4. SPU: Bioretention to Underground Injection Control Well Water Quality Monitoring ($94,200). Monitor and analyze water quality of the effluent from two bioretention systems that discharge to underground injection control wells. These data will help to inform design and maintenance requirements of these new systems. 5. City of Seattle, SPU: Protect Your Pipes: Flush Only Toilet Paper ($80,000). Reduce trash in Seattle’s wastewater pipes, pumps, and treatment plants and reduce potential trash from entering waterways during CSO disharges through an outreach and social marketing campaign.
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6. Delridge Neighborhoods Development Association: Delridge Wetlands Restoration and Stewardship Project ($50,000). Restore the wetland and install new green stormwater features to improve water quality entering Longfellow Creek at the former Seattle City Light transfer station site. 7. Environmental Coalition of South Seattle (ECOSS): Environmental Stewards Program ($55,000). Facilitate community educational workshops on water quality issues in the Green/Duwamish Watershed, targeting multilingual community members, and connect residents to activities and resources that protect and improve water quality. 8. ECOSS: Greening Community Spaces 2 ($50,000). Design and build two to three green infrastructure demonstration projects, outdoor learning spaces, and community amenities at highly visible and frequented urban community spaces, with a focus on reaching hard-to-reach audiences in multiple languages. 9. Environmental Science Center: Salmon Heroes: Watershed Education and Water Quality Training for Underserved Students ($50,000). Use project-based learning to train students on water quality issues; improve stewardship attitudes; and increase understanding of watershed issues in underserved areas of Renton, Kent, and South Seattle. 10. IslandWood: Community Waters – Connecting Stormwater Curriculum to Local Watersheds ($200,000). Integrate localized Puget Sound stormwater education into a district-wide 4th grade science curriculum in the Seattle Public Schools district, using a multifaceted learning model about best management practices (BMPs) for stormwater. 11. King County WLRD: Duwamish Source Control and Community Engagement ($150,000). Sample and source trace pollutants; conduct business inspections; and build a coalition and organizing structure for enhanced watershed-wide stormwater management among the Green/Duwamish community, jurisdictions, agencies, nonprofits, and businesses within WTD’s service area. 12. King County WTD with Urban Systems Design: Duwamish Infrastructure Restoration Training (DIRT Corps): Growing Green Infrastructure Careers through On-the-Job Training – Phase 2 ($50,000). Provide multilingual young adults with green infrastructure training and on-the-job experience, serving communities of South King County identified by WTD for equity and social justice initiatives. 13. Mountains to Sound Greenway Trust: Greenway Education Project ($25,000). Provide a hands-on scientific learning experience to nearly 4,000 students during the school year through classroom sessions, field investigations, and service-learning stewardship; outreach will focus on highest need low-income schools. 14. Seattle Parks Foundation: Water Quality Education at Gateway Park North, Georgetown ($65,000). Coordinate with public landowners; plant and maintain anti- erosion native plants; and design, install, and maintain a demonstration rain garden at the street end on the Duwamish River to address stormwater problems. 15. Seattle Parks Foundation: Building Green Walls to Mitigate Water and Air Pollution in a Community with Environmental Equity Concerns ($56,500). Design, site, and install two green wall projects in the Duwamish Valley; engage community members and organizations throughout the process.
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16. Sustainability Ambassadors with Sustainable Seattle: Green/Duwamish Project Design Lab ($89,969). Engage middle and high school teachers in four Green/Duwamish school districts (Seattle, Tukwila, Kent, and Auburn) to design and test a curriculum on local water quality. Teachers will also facilitate student-led community impact projects and advocate for district-wide adoption of the best models. 17. Tilth Alliance: The Watershed Stewards Project ($50,000). Provide extensive training in watershed stewardship and outreach to volunteers from communities east and south of Lake Washington. Once trained, these volunteers will provide over 1,000 hours of community service, reaching over 2,500 people. 18. World Relief: Hillside Paradise Parking Plots Community Garden ($75,000). Reduce stormwater runoff and pollution to waterways and reduce flooding by harvesting rainwater from the roof of the Hillside Church for watering a community garden. Educate and engage refugee and immigrant community members and gardeners on water quality topics. 19. YMCA of Greater Seattle – Earth Service Corps: Youth in Action: Stewardship, Education & Leadership ($33,200). Educate diverse youth in after-school programs on watersheds and water quality issues, and empower them to address issues in their communities through environmental service projects.
2.4 Industrial Waste Program The King County Industrial Waste (KCIW) Program regulates industrial customers of King County’s regional wastewater system. KCIW program functions under WTD as a delegated pretreatment program required by NPDES permits for operation of the division’s wastewater treatment plants. KCIW’s duties include issuing approvals for discharging industrial wastewater to the sewer system, monitoring permitted dischargers, conducting inspections, and taking enforcement action when necessary.
KCIW issues several types of discharge approvals (control documents). The type of approval is determined by the nature of the business, volume and characteristics of the wastewater, and potential risks to the system. Of the more than 600 customers under an active control document, approximately 25 percent are in the LDW drainage area.
This section describes KCIW’s work related to the LDW drainage area in 2017 under the following subsection headings: • Listing of Industrial Users • Listing of Inspections • Collaborations • Special Studies and Incident Responses A comprehensive list of KCIW activities can be found in the annual pretreatment reports submitted to Ecology.
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2.4.1 Listing of Industrial Users Industrial users that were active at the end of each year in LDW CSO drainage areas are listed in Appendix A, Table A-1. The table includes a column to designate whether the particular industrial user is a significant industrial user (SIU) with a waste discharge permit or a non-SIU with a lower-level discharge authorization.
2.4.2 Listing of Inspections KCIW inspects each SIU at least once annually, including all facilities that have applied to renew their discharge approvals. KCIW also conducts periodic inspections of major non- SIUs, typically once within the five-year permitting cycle or when significant facility modifications occur during the cycle. KCIW staff conduct miscellaneous inspections alone or jointly with staff from other regulatory agencies. Inspections conducted in 2017 in LDW CSO drainage areas are listed in Appendix A, Table A-2.
2.4.3 Collaborations KCIW coordinates with several other agencies on an ongoing basis to control sources of pollutants in the LDW. The following are some of the most significant collaborations during 2017:
• Duwamish Inspectors Group. A lead investigator from KCIW participated in the Duwamish Inspectors Group, which is a forum for inspectors from the City of Seattle, Ecology, King County, and other agencies to discuss regulatory issues at commercial and industrial facilities in the LDW basin.
• Review of source control documents. KCIW staff reviewed drafts of various source control reports and provided input to King County’s proposed future source control activities.
• Technical support for S Michigan Basin source control study. A KCIW staff engineer reviewed the study report and provided technical assistance to the project manager for the WTD-funded LDW-related source control study (see Section 2.5.2, “Summary of Source Control Studies,” below).
2.4.4 Special Studies and Incident Responses This subsection describes KCIW special studies and incident responses in 2016.
2.4.4.1 Surveys of Potential Industrial Dischargers During 2017, a survey initiated in 2016 was continued in accordance with Ecology’s Guidance Manual for Performing an Industrial User Survey (Ecology Publication No. 11-10- 055). Work in 2016 involved sorting businesses based on type, location, and risk to the system. The survey was mailed to 24,000 businesses throughout the County’s wastewater service area, reaching 17,000 businesses that are most likely to discharge non-domestic
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wastewater. The survey was conducted online and was available in five languages in addition to English. KCIW identified and prioritized types of businesses that were most likely to require a permit or additional oversight by the Industrial Waste Pretreatment Program. These 2,600 businesses received additional mailings and other follow-up to increase the participation rate. The response rate for this group was 83 percent; the overall survey response rate was 36 percent (6,000 businesses total). For 2017, King County reviewed the data from the 6,000 responses that were collected and sorted them into four groups by priority level. The highest priority level included surveys from respondents that indicated that their company performed categorical processes; discharged, on average, over 20,000 gallons per day; or had anodizing solutions on-site. KCIW categorized 66 companies into the highest priority level. KCIW worked with a consultant to provide database training for the investigators. The training enabled the investigators to use the 2016 Industrial User Survey database as a customer records management tool and tracking system. All 66 companies were evaluated by an investigator to determine if the company had completed the survey correctly and if they were still active in the King County Service area. For companies that were still active in the service area and had completed the survey correctly, the investigator determined if no control documents are needed or if a permit application is required. Of the 66 companies, six were located within LDW CSO basins. For 2017, the industrial user survey project neared its completion, with the output being incorporated into the KCIW pretreatment database tracking system; however, some work will continue in 2018 as one of KCIW’s priority projects. Lower Duwamish area facilities will be a priority for follow-up.
2.4.4.2 Response to Unusual Occurrences In 2017, KCIW staff continued to work with County treatment plant and conveyance inspection staff, local sewer agencies, and other regulatory agencies to evaluate and respond to referrals of unusual occurrences in the wastewater system. Staff also responded to notifications from Ecology’s Environmental Report Tracking System (ERTS). ERTS notifies local agencies of complaint calls regarding potential illicit discharges to the sanitary sewer. KCIW evaluates each referral on a case-by-case basis. Responses include follow-up calls to industrial facilities, inspections, sampling, and surveillance monitoring at key sampling maintenance holes.
The program responded to seven referrals within the Lower Duwamish area. Referrals regarding permitted facilities were handled by the assigned staff. The program did not issue any new control documents based on the referrals. There was no further follow-up required in 2017.
2.4.4.3 Surveillance Monitoring KCIW investigates potential sources of spills, slug loads, or illicit discharges by monitoring contaminants of concern at strategic maintenance holes near suspected industrial users or
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possible polluters. In addition, KCIW designs key maintenance hole studies to collect technical data in the regional wastewater system to use in the evaluation of local limits. There was no new surveillance monitoring required or conducted in the LDW drainage area in 2017.
In 2017, KCIW staff met with staff from SPU to discuss historical source tracing data that KCIW had collected within the 8th Avenue South (8th Ave. S; located in South Park) and Brandon CSO basins. The outcome of these meetings was that there was no need for WTD to conduct further source tracing in these areas in the immediate future. However, this could change should WTD become aware of source control issues in these basins that require further follow-up.
2.5 Sediment Management Program This section summarizes source control activities supported by WTD’s Sediment Management Program in 2017.
2.5.1 Source Tracing Activities Since 2010, King County has been collecting solids samples from pipes, wet wells, and outfall weir structures in the combined sewer collection system in the LDW basin to trace sources of pollution (see King County 2016b; Appendix B for 2010 to 2015 data). The 8th Ave. S CSO basin was sampled for this reporting period. A sediment trap sample was collected in June 2016, with results reported in last year’s source control annual report. A subsequent sediment trap was deployed over approximately seven months (June to December 2016), followed by one more deployment from December 2016 to June 2017.
Results for December 20162 and June 2017 sediment trap collection dates are presented in this annual report (Table 2). Sediment trap samples were also collected in two locations within the S Michigan CSO basin for another King County project. The sampling locations were at (1) Corson Avenue South and South Eddy Street and (2) S Michigan Regulator Station. The data from these samples, collected in June and December 2017 at both locations, are included in this annual report because the same sampling methodology was used to collect the samples. The sediment traps were installed at a level above sewage base flows in all three sampling locations. The goal is to capture solids indicative of flows associated with CSOs.
2 The 2016 sample is reported for 2017 activities because the analytical results were not available until 2017.
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Summary of Source Tracing Samples Collected from the Combined Sewer System (2016 and 2017). Number of Samples Sediment Trap Collection Year 8th Ave. S CSO Basin S Michigan CSO Basin* Sediment traps 2016 1 0 2017 1 4 * Samples from this basin were collected for another King County project. They are reported here because the sampling methodology was the same as that used for source tracing.
As outlined in King County’s LDW SCIP, source tracing screening levels for the combined sewer system are two times the second lowest apparent effects threshold (2LAET), and the source tracing focuses on metals, mercury, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and certain other semivolatile organic compounds. Analyses of all sediment trap samples, therefore, included metals, mercury, PCBs, and semivolatile organic chemicals. In addition, solids from combined sewer lines typically result in analytical matrix interferences that, in turn, often result in elevated detection limits3.
2.5.1.1 8th Avenue South CSO Basin The 8th Ave. S December 2016 sediment trap sample had concentrations of mercury and bis(2-ethylhexyl) phthalate (BEHP) above combined sewer system source tracing screening levels. The di-n-butyl phthalate concentration was greater than the 2LAET, but not the screening levels. The 8th Ave. S June 2017 sediment trap sample only had concentrations of BEHP greater than the CSO screening level.
Further evaluation of mercury in 8th Ave. S CSO source tracing sediment trap samples indicates that higher levels of mercury are not consistently found in the solids sample. The 2016 duplicate sample for mercury was below both the screening level and the 2LAET. In 2017, mercury concentrations in both primary and duplicate samples were below the screening level and the 2LAET. Mercury tends to be heterogeneous in the combined sewer basins based on sampling in other combined sewer basins and the laboratory duplicate sample data associated with samples collected from the 8th Ave. S CSO basin.
Based on the mercury results from the source tracing samples, King County met with SPU staff and requested right-of-way catch basin sample data for mercury along 8th Ave. S. These data showed four samples below and three samples above the 2LAET and no samples above the combined sewer system screening benchmark. The sediments near the outfall do not show any exceedances for mercury (AECOM 2012; SAIC 2011), and the outfall has had only two discharge events in last 10 years (King County 2018). Based on the
3 Smaller mass of sample is often used from the sample jar for analytical extraction methods or dilutions are required after analytical extraction methods. This is done so that analytical quality control/quality assurance performance is acceptable, although it can result in elevated detection limits.
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sediment conditions, infrequent use of the outfall, and the heterogeneous nature of the source tracing samples, further source tracing in this area is not being conducted at this time.
Further source tracing is also not being pursued for BEHP because the concentrations have been observed at levels commonly found in source tracing datasets. These levels have been characterized as ubiquitous in the samples and thus are not readily traceable to a particular source. In addition, there are no sediment exceedances for BEHP near the outfall (AECOM 2012; SAIC 2011).
Sediments near the 8th Ave. S CSO outfall only had an exceedance of the Washington State Sediment Management Standard’s sediment quality standard (SQS) for total PCBs at one station and benzyl alcohol at another station (AECOM 2012; SAIC 2011); a third station nearby had no exceedances of the SQS. PCBs in source tracing solids samples were below the LAET, and benzyl alcohol was not detected. Based on the sediment data near the outfall and source tracing solids data, no further source tracing efforts are planned for the 8th Ave. S CSO basin at this time.
2.5.1.2 South Michigan CSO Basin Both of the S Michigan CSO basin samples from June 2017 had concentrations of BEHP above the CSO source tracing screening level. The June 2017 sample also had concentrations of phenol above the 2LAET in the sample collected at the regulator station. The concentrations of BEHP in the December 2017 samples were above the 2LAET at the regulator station, but below both the screening level and 2LAET at the Corson and Eddy locations. Mercury concentrations from the December 2017 regulator station sample were also above the 2LAET.
Sediments near the S Michigan CSO outfall have exceedances of either SQS or benthic cleanup screening level (CSL) for total PCBs, the SQS for butyl benzyl phthalate (BBP), and benthic CSL for BEHP (AECOM 2012; King County 2017a). Sediments farther from the outfall also have SQS exceedances for total PCBs, and one sample south of the outfall near the 1st Avenue South Bridge has an SQS exceedance for mercury.
Although there are sediment exceedances for BEHP and BBP in sediments near the S Michigan CSO outfall, no additional source tracing efforts are planned for phthalates at this time. This is because of fluctuating concentrations within the combined sewer system solids data (not consistently observed above screening levels) and because these phthalates are ubiquitous in the samples and thus are not readily traceable to a particular source. Source tracing solids PCB concentrations also fluctuated in 2017 samples and were observed below 2LAET. Based on this, PCBs are at levels not readily traceable to a particular source. The Georgetown WWTS being constructed to control S Michigan CSO discharges is expected to greatly reduce solids discharged from the CSO, and thus address phthalate and other contaminants within the discharge.
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2.5.1.3 Next Steps For 2018, sediment traps for source tracing activities will be installed in the Hanford #1 combined sewer basin and near the West Marginal Pump Station for the T115 CSO (which receives CSO discharges via an overflow weir within the conveyance line along the west side of the LDW).
2.5.2 Summary of Source Control Studies Sources of chemical contaminants to the LDW Superfund site include both historical and current sources. Current sources can be transported through various pathways to the LDW, including inputs from the Green River, direct discharge of stormwater, CSOs, atmospheric deposition, spills and leaks of contaminated material, groundwater, and bank erosion or leaching of contaminants from materials. King County has been conducting studies to characterize contaminants in some of these pathways identified for the LDW. This section summarizes the status of the two remaining studies to be completed. The source control annual report for 2014 to 2015 activities summarized the full list of these studies (King County 2016b).
2.5.2.1 CSO Basin Inputs Study King County’s CSO basin inputs study is a pilot study to examine pathways of contaminant sources to combined sewer basins in the LDW (King County 2011, 2013). Combined sewer basins include inputs from domestic and industrial wastewater (sewage), groundwater infiltration into combined sewer lines (infiltration), and stormwater runoff (inflow). This study aims to better understand the present-day pathways for loadings of select chemicals into combined sewer basins. Specifically, the study seeks to identify primary pathways of LDW contaminants of concern in combined sewers to determine whether contaminants are primarily from stormwater, sewage, or groundwater infiltration entering the system.
The results of this study are intended to help guide source tracing efforts in combined basins before CSO control by estimating the primary pathways of contaminant sources during stormflow conditions (storm events when sewage and stormwater are both present in the system) that could lead to CSO discharge. King County selected the Brandon and S Michigan combined sewer basins for this study, both of which are priorities for CSO control in the LDW. The Brandon Combined Sewer Basin Study Data Report was completed in 2016 (King County 2016c). The Michigan Combined Sewer Basin Study Data Report was completed in 2017 (King County 2017b).
For most contaminants, stormwater contributes more of the chemical input into the Brandon and S Michigan combined sewer basin than sewage during storm events. The findings are similar between the two combined sewer basins despite some differences in land use. Although the studies only collected and analyzed samples within the combined sewer systems, not from CSO discharges, the results suggest that efforts to reduce pollution in stormwater pathways of combined systems would be the most effective way to reduce
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the amount of most chemical contaminants that could be released to the waterway during an untreated CSO event.
2.5.2.2 Green River PCB Equipment Blank Study King County is conducting a study to evaluate the potential for sampling equipment to cause contamination in samples analyzed for low-level PCBs (King County 2015). Equipment blank samples collected for previous studies suggest that autosampler equipment may be contributing PCBs to surface water samples collected from the Green River Watershed. This study includes the collection of surface water samples from the Green River as well as autosampler tubing equipment blank samples. These samples will help determine specific PCB congener contamination from autosampler equipment and evaluate the potential bias to middle and lower Green River surface water samples collected in previous King County Green River Watershed studies. Sampling and analysis was completed in 2017, with the study report finished in early 2018.
2.5.3 Summary of Regulatory Review Actions A description of a pollution prevention program, appropriate BMPs, and the legal authority and administrative procedures that will be used to ensure the pollution prevention program is being implemented in combined sewer basins were submitted to Ecology in the County’s 2017 CSO Control Program annual report (King County 2018). WTD relies on SPU to implement these pollution prevention actions (e.g., spill response, water quality complaint response, and street sweeping) in areas of Seattle served by WTD CSO facilities. SPU tracks and reports to WTD on these BMPs. SPU does not report records separately for the LDW combined basins to WTD, although it maintains details of all activities.
During 2017, SPU tracked the following pollution prevention BMPs in areas served by King County CSOs (this includes the LDW drainage area plus all other combined basins within the City of Seattle served by County CSOs):
• Water Quality Complaints: SPU inspectors respond to complaints as they are received through the water quality hotline, webpage, or agency referrals. In 2017, 186 water quality complaints were reported in these basins. • Spill Response: Spills are dispatched through the SPU Operations Response Center to on-call spill coordinators as they are received. In 2017, SPU responded to 268 spills within these basins. • Street Sweeping: SPU coordinates with the Seattle Department of Transportation (SDOT) to conduct street sweeping on arterials in Seattle using high-efficiency regenerative air street sweepers. In 2017, SPU and SDOT swept 10,128 lane miles in these basins.
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3.0 WATER AND LAND RESOURCES DIVISION This section summarizes source control actions taken by WLRD in the LDW drainage area during 2017.
3.1 Stormwater Services
3.1.1 Mapping Updates In accordance with the NPDES Phase I Municipal Stormwater Permit (S5.C.2, Municipal Separate Storm Sewer System Mapping and Documentation), King County is required to map and document the municipal separate storm sewer system (MS4) on properties it owns or operates, including the County right-of-way, and on properties that discharge to the MS4. King County submits annual progress reports to Ecology on the MS4 mapping effort; this occurs as part of the Municipal Stormwater NPDES Annual Report.
King County completed the mapping effort for unincorporated areas that drain to the LDW in 2016, except for locations that needed advanced investigations such as closed-circuit TV studies, engineering reviews, and similar type of approaches. In 2017, King County conducted a data gap analysis of the MS4 system in the unincorporated drainage area to the LDW. This gap analysis was conducted to better understand potential system connectivity and identified 29 locations within the drainage system that require advanced investigations to resolve system connectivity issues. This analysis also determined that no further investigations were needed for the facilities in the unincorporated drainage areas to the LDW. King County has created this inventory and initiated a project to resolve these issues in 2018 and 2019. These actions will improve the stormwater asset inventory datasets in the LDW drainage area in unincorporated King County and thus an understanding of the MS4 connectivity.
3.1.2 Business Inspections An inventory of the parcels in the unincorporated area of the LDW drainage area was created and each parcel was rated according to its potential to pollute and its stormwater inspection compliance history. A schedule of these accelerated inspections began in 2016. Fifty-three source control inspections were conducted in 2017. Table 3 summarizes these business inspections. Issues that were not resolved by the end of 2017 are noted as “ongoing technical assistance” in the “Comments” column of the table.
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Business Source Control Inspection Results. Company Date Comments 509 Auto Repair and Electric 1/9/2017 No problems found Absolute German 11/21/2017 Joint inspection with Ecology; issues with waste disposal records, spill cleanup, waste labeling, and general housekeeping. Ace Galvanizing 11/2/2017 Joint inspection with Ecology; issues with 11/16/2017 adequately capturing contaminated 12/1/2017 stormwater for treatment, hazardous waste storage, cleanup practices, and sediment control during construction. Carey Limousine 6/2/2017 Issues with hazardous waste storage and 8/7/2017 labeling, catch basin cleaning. Concrete Restoration Inc. 11/29/2017 Only one issue with drum storage, which was immediately corrected. Custom Space 6/2/2017 Brand new structures; no problems found. Delta Marine 11/28/2017 Joint inspection with Ecology; issues with 12/18/2017 cover and containment, labeling, spill cleanup; ongoing technical assistance. Diamond Painting LLC 12/8/2017 Issues with conveyance system, catch basin labeling, outdoor work, container storage, boat washing, paint filter disposal; ongoing technical assistance. Graffix 10/12/2017 Issues with conveyance system, waste 10/27/2017 storage and labeling, outdoor storage, 11/13/2017 metal shavings; ongoing technical assistance. 12/14/2017 National Products Inc. 5/2/2017 No issues found. NRC Environmental 12/19/2017 Joint inspection with Ecology Hazardous Waste; catch basin labeling needed; improve liquid storage; ongoing technical assistance. NRC Office and Shop 12/22/2017 Conveyance system needs cleaning; ongoing technical assistance. Old Dominion Service Shop 11/29/2017 Issues with liquid storage, spill cleanup, 12/1/2017 possible need for secondary containment 12/4/2017 (no) scrap storage; unsure where trench drains go (sanitary). 12/8/2017 12/20/2017 Pacific Industrial Supply 5/20/2017 Issues with waste and product storage, 6/2/2017 inoperable vehicles, waste oil, batteries. 8/7/2017 10/18/2017 11/2/2017
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Company Date Comments Pacific Northwest Motor Freight Lines 12/21/2017 Issues with conveyance system, labeling, recordkeeping, waste storage; ongoing technical assistance. Pro Weld 5/17/2017 Unable to access after four visits. Puget Sound Coatings 12/20/2017 Joint inspection with Ecology; minor storage and labeling issues; ongoing technical assistance. QualFab 11/1/2017 Joint inspection with Ecology; issues with 11/13/2017 discharges to storm drain, oily 12/1/2017 wastewater, waste storage, grindings; ongoing technical assistance. 12/18/2017 Rick's Master Marine 12/21/2017 Joint inspection with Ecology Hazardous Waste issues with labeling, secondary containment. Security Contractor Services 11/30/2017 Joint inspection with Ecology; minor 12/15/2017 issues with waste storage. Security Contractor Services Storage 10/17/2017 Issues with labeling, secondary 11/6/2017 containment, spill materials. 11/13/2017 11/21/2017 Shell Gas Station & Bikini Espresso 11/6/2017 Issues with secondary containment and 11/13/2017 labeling, conveyance system, solid waste 11/16/2017 storage, illicit connection from espresso stand, spill cleanup; ongoing technical 11/21/2017 assistance. 11/30/2017 12/4/2017 12/8/2017 12/14/2017 12/20/2017 Warp Corporation 5/2/2017 No issues found.
King County received three water quality complaints that were investigated, as shown in Table 4.
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Water Quality Complaint Investigations in 2017. Company Date Comments Company allegedly paint scrapping and spraying Modern Carport & Fence 7/10/2017 outside; information provided to property management and business owner. Evidence of outdoor spray painting and improperly Seattle’s Espresso 7/13/2017 stored garbage; garbage removed, spills cleaned up, Restore and education provided. Integrity Energy Systems 11/07/2017 Observed company van being washed outside into the storm drain; practice stopped, extra water mopped up, education provided.
3.1.3 Participation in Duwamish Inspectors Group The Source Control Program manager regularly attended the Duwamish Inspectors Group meetings, sharing information about inspections and coordinating inspections whenever possible. Other members of this group include Ecology, City of Seattle, Puget Sound Clean Air, LHWMP, and other King County programs.
3.1.4 Source Tracing Activities The following subsections provide summaries of source tracing solids data collected in May 2017 by King County’s Stormwater Services Section (SWS) from unincorporated King County LDW drainage basins. Sediment trap samples were collected from sampling locations 96-ST1, 96-ST2, and 96-ST3, which are all associated with stormwater drainages that flow into the North Fork Hamm Creek to the LDW. All samples were analyzed for metals, total organic carbon, grain size distribution, and semi-volatile organic compounds. Appendix C contains the sample results.
The summaries below include a comparison of sample data to source control screening benchmarks (LAET and 2LAET) per steps in the County’s SCIP (see SCIP, Appendix F). The receiving water sediment data reviewed as part of the source tracing data evaluation were from the LDW Feasibility Study (AECOM 2012), outfall sediment sampling by Ecology (SAIC 2011), and 2018 sampling conducted by the Lower Duwamish Waterway Group in support of Ecology source control efforts (Windward 2018).
3.1.4.1 Location 96-ST1 (Sediment Trap Collected May 4, 2017) The sediment trap sample had concentrations of BEHP, phenanthrene, and benzoic acid4 above 2LAET and concentrations of zinc and fluoranthene above the LAET. The BEHP is at a level that is commonly observed in storm drain solids and would not likely be traceable to
4 Benzoic acid is not a contaminant identified for source tracing because it is not persistent. In addition, there are no exceedances of SMS in sediments near the North Fork of Hamm Creek.
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a particular source. There are no BEHP Sediment Management Standards SQS exceedances in nearby receiving sediment samples.
These results for zinc and two PAH compounds, coupled with previous years’ results, were interpreted to warrant source tracing in the stormwater conveyance system up-pipe of this location. Note that sediments near the discharge of North Fork of Hamm Creek do not exceed SQS (or LDW remedial action levels) for zinc or high molecular weight polycyclic aromatic hydrocarbons (HPAHs) in nearby sediments.
3.1.4.2 Location 96-ST2 (Sediment Trap Collected May 4, 2017) There were no results that were above the 2LAET. Only BBP had concentrations above the LAET. BBP is at a level often seen in source tracing storm drain solid samples and there are no SQS exceedances in available nearby receiving sediment samples. These results were interpreted to not warrant source tracing in the stormwater conveyance system up-pipe of this location. Previously, zinc was above the LAET, but the 2017 sample was below the LAET. SWS and Ecology have been working to control likely sources of zinc.
3.1.4.3 Location 96-ST3 (Sediment Trap Collected May 4, 2017) The sediment trap sample had concentrations of BEHP above the 2LAET and concentrations of zinc and BBP above the LAET. Zinc and the phthalates are at levels often seen in source tracing storm drain solid samples, and there are no SQS exceedances in available nearby receiving sediment samples for any of these chemicals. This location includes runoff from Highway 509 and is situated “upstream” of two other sampling locations within the basin. These results were interpreted to not warrant source tracing in the stormwater conveyance system up-pipe of this location.
3.1.4.4 Summary Based on the foregoing sample results summations for 2017, the source tracing activity planned for 2018 is to collect grab solids samples from four locations (catch basins) draining to the sediment trap location for 96-ST1. The 2017 sediment trap sample results for 96-ST2 and 96-ST3 do not, at this time, trigger source tracing actions in the stormwater system up-pipe of those locations. However, sediment trap bottles were redeployed in 2017 at the above three locations. Upon interpretation of 2018 sediment trap data, further source tracing may be undertaken for these locations.
3.2 Local Hazardous Waste Management Program LHWMP implements the moderate-risk waste plan, which addresses hazardous wastes generated by residents and small quantities generated by businesses. LHWMP activities in
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the LDW for 2017 are summarized below. More information on LHWMP’s services is available at www.hazwastehelp.org.
codes listed in Table 5. The effort focused on on-site technical assistance visits to businessesThe Technical for Assistancehazardous &material Incentives and teamwaste provided management 173 site, including visits in discharges 2017 in the to zip sanitary and storm drains. Other services to businesses include EnviroStars consultations and verifications for recognition.
LHWMP Site Visits in 2017 in the LDW Drainage Area. Zip Code 2017 98106 8 98108 18 98134 145 98168 2 Total 173
The team visited businesses that generate or store hazardous wastes and materials. These site visits occurred between January and December 2017. The businesses made improvements in hazardous waste and material storage, spill prevention, and waste disposal. LHWMP issued vouchers to reimburse businesses 75 percent of their costs (up to $599 dollars) for purchasing and installing pollution prevention equipment, if needed.
LHWMP also worked with select businesses and ethnic groups known to work in topic areas such as the following: dry cleaning companies to explore alternatives to using perchloroethylene and other chlorinated solvent spot cleaners; nail salons to address worker and customer exposures to hazardous solvent vapor; custodial services regarding the safe use of cleaning products and the promotion of safer alternatives; lead to reduce childhood lead poisoning in residential housing; and autobody shops to promote waterborne paint systems instead of solvent-based paint systems.
Through a contract with ECOSS, the LHWMP Business Field Services team also provided spill kits, customized drainage maps, spill plans, and spill cleanup training to businesses that lacked these items.
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4.0 DEPARTMENT OF TRANSPORTATION This section summarizes source control actions taken in 2017 in the LDW drainage area by KCIA and the Road Services Division of the King County Department of Transportation.
4.1 King County International Airport KCIA source control activities conducted in 2017 include Industrial Stormwater General Permit (ISGP) compliance, MS4 permit compliance, contaminated site cleanups, spill responses, annual stormwater solids monitoring, and stormwater line cleaning.
A map of KCIA drainage areas5 is provided in Appendix D, Map 1. KCIA is divided into four source control areas in associated drainage basins:
• Slip 4 (LDW river mile [RM] 2.8; north drainage area)
• Boeing Isaacson/Central KCIA/Former Slip 5 (LDW RM 3.7−3.9; central drainage basin)
• Slip 6 (LDW RM 3.9−4.3t; south-central drainage basin)
• Norfolk CSO/Storm Drain (LDW RM 4.9; south drainage basin) The Ecology source control action plans for these KCIA source control areas were reviewed, and 2017 actions described in this section are consistent with those listed in the LDW Source Control Status Report for 2013 (Ecology 2014).
Source control activities related to ISGP compliance, the MS4 permit, and other source control activities organized by four different KCIA source control areas are discussed below. Maps of sampling areas as well as past source tracing data can be found in the previous annual report (King County 2016b).
4.1.1 Industrial Stormwater General Permit Compliance In 2017, KCIA monitored stormwater at two sampling points in two of the airport’s drainage areas in accordance with the ISGP. The two areas sampled were central KCIA basin (SP2 sampling point) and south-central/Slip 6 basin (SP3 sampling point). Sampling at the third area, north/Slip 4 basin (SP1 and SPM sampling points), was not required in 2016. Sampling point SP4, located in the relatively small south drainage basin, was removed in 2012 because no airport industrial facilities are located in the basin. These sampling locations have been shown on maps included in the previous annual report (King
5 These drainage areas do not delineate the entire geographic area or basin that drains to each of these slips or outfalls. They are only intended to delineate the areas within the airport (not including the North Boeing Field area leased by the Boeing Company) that drain to each of these areas.
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County 2016b; 2017c). Sample parameters include turbidity, pH, zinc, copper, and petroleum sheen unless consistent attainment (CA) was achieved.6 The status of each sampling point is as follows:
• The SP1 and SPM sampling points achieved CA for turbidity, pH, zinc, and copper. In accordance with the 2015 ISGP, sampling of these parameters ceased in the first quarter of 2015 and will resume the first quarter of 2018. Petroleum sheen and total suspended solids (TSS) will continue to be monitored at SP1 and SPM.
• CA was achieved at SP2 for pH, zinc, and copper. Sampling will resume for these parameters in the fourth quarter of 2018. Turbidity, petroleum sheen, and TSS at SP2 will continue to be monitored.
• CA was achieved at SP3 for turbidity, pH, and zinc. Sampling at this location will resume for these parameters in the fourth quarter of 2018. Copper, petroleum sheen, and TSS at SP3 will continue to be monitored. Table 6 shows the 2017 average values for turbidity and copper based on quarterly data from discharge monitoring reports. Turbidity results for the third quarter (27.7 nephelometric turbidity units [NTU]) at SP2 were above the benchmark value of 25 NTU. A level-one corrective action was performed that included SP2 sampling on November 22, 2017 (15.1 NTU), and January 30, 2018 (10.2 NTU). The turbidity exceedance was temporary.
Copper results for the third quarter at SP3 were above the benchmark value of 14.0. A level-one corrective action was performed that included a site investigation and review of BMPs and resampling on November 22, 2017. The resampling resulted in a copper concentration (7.5 micrograms per liter [µg/L]) below benchmark value, indicating the source as temporary. Pavement sweeping and oil–water separator (OWS) maintenance was performed during the third quarter. Line cleaning and OWS cleaning was performed during the third quarter.
ISGP Discharge Monitoring Data Annual Averages for 2017. Location Turbidity (NTU) Zinc (µg/L) Copper (µg/L) SP1 CA CA CA SP2 22.6 CA CA SP3 CA CA 7.9 SPM CA CA CA Benchmarks 25 117 14
6 CA is achieved when eight consecutive quarterly samples demonstrate a reported value equal to or less than the benchmark value or when they are within the range of 5.0 to 9.0 standard units for pH. Sampling is resumed 12 months after CA is achieved.
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KCIA implemented airport-wide BMPs in accordance with its ISGP Stormwater Pollution Prevention Plan. Treatment BMPs such as OWSs, water quality vaults, and StormFilter systems have been installed and are being maintained. KCIA performs daily mechanical sweeping of paved areas, annual inspections of stormwater facilities, and weekly maintenance of OWSs. KCIA inspects tenant and airport common areas monthly to ensure that BMPs are being maintained. Stormwater line cleaning is being performed in accordance with the ISGP (see Section 4.1.3, “Source Tracing Activities and Remediation,” below).
Several tenants at KCIA who are also covered by an ISGP comply directly with Ecology on the ISGP requirements. KCIA ISGP tenants are listed in Table 7.
KCIA Tenants and ISGP Numbers. Tenant and Facility Name Permit Number Signature Aviation (formerly Landmark Aviation) WAR000607 UPS (Boeing Field) WAR000434 The Boeing Company (North Boeing Field) WAR000226 Ameriflight, LLC WAR002830 KC WTD (Georgetown Yard) WAR010792 Charles Air WAR127177
4.1.2 MS4 Permit Compliance KCIA performed spill response activities in 2017 in accordance with its spill response policy. The policy requires that spills be addressed immediately upon discovery.7 Notification requirements include contacting airport operations and firefighting units. To ensure zero discharge to receiving waters, pump stations are turned off when spills enter the stormwater drainage system. Sixteen spill events were recorded in 2017. Spill events resulted in proper cleanup and Ecology notifications, as needed. None of these spills entered receiving waters.
In August 2017, KCIA performed annual illicit discharges/connection inspections. Inspections were performed during dry periods and at various discharge points on airport property. No suspected or obvious illicit connections were identified at KCIA discharge points. Data are used to track and source-trace any suspected or obvious discharges that are observed.
In September 2017, KCIA performed annual stormwater facility inspections. The inspections involved measuring the amount of sediments in 20 stormwater structures, including OWSs, stormwater vaults, water quality vaults, StormFilter treatment systems, and stormwater retention systems. Measurements were used to develop schedules for
7 In addition, spill prevention materials (e.g., oil-absorbing materials such as booms and mats) are available in areas required per the NPDES ISGP permit.
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cleaning. OWSs are also maintained weekly for oils and floatables (e.g., replacing oil- absorbent booms).
4.1.3 Source Tracing Activities and Remediation In 2017, source control activities such as sampling, source tracing, remediation, and line cleaning (per the ISGP) were performed in KCIA’s four source control areas. A map of sampling, source tracing, and remediation locations was provided in the previous annual report (King County 2016b).
Stormwater solids samples were collected in source control areas draining to Slip 4, Former Slip 5, and Slip 6, as part of annual stormwater solids sampling and in support of the County’s LDW SCIP. Table 8 presents the numbers of source tracing samples collected in each area in 2017. Appendix E provides source tracing sampling data for 2017. As outlined in King County’s LDW SCIP, source tracing screening levels for the storm drain solids are the SQS/LAET and the CSL/2LAET of the Sediment Management Standards.
Number of Source Tracing Samples Collected from KCIA Source Control Areas in 2017. Number of Samples Sample Type Slip 4 Former Slip 5 Slip 6 In-line solids grab 4 2 1 Sediment traps 4 2 1 Catch basin/OWS 0 0 0
Summaries of source control activities, including sampling and any remedial activities, are presented by drainage basin below. In accordance with the County’s LDW SCIP, annual in- line trap and grab sampling will continue in 2018. The ongoing sampling will assist in investigating contaminant trends.
4.1.3.1 Slip 4 Basin The KCIA Slip 4 source control area is located in the north area of KCIA. North Boeing Field (NBF), an area of KCIA leased by the Boeing Company, is downgradient of the KCIA drainage area; KCIA non-leased areas (runways and taxiways) and areas leased by tenants other than Boeing are located up-gradient of NBF. Off-site stormwater from the east (Airport Way) discharges into the KCIA stormwater system. Stormwater is discharged from NBF through the north pump station and to Slip 4 via a stormwater pipe.
Sampling and Source Tracing In May 2017, KCIA collected annual in-line trap and grab stormwater solids samples at the south (SL4-T2A) and south-central lateral (SL4-T3A) drainage areas of Slip 4. In April 2017, the Boeing Company collected stormwater solids samples at the north-central (SL4-T4A)
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and north lateral (SL4-T5B) drainage areas of Slip 4.8 These sampling locations are the major laterals of the KCIA Slip 4 source control area that discharge into the NBF site. Appendix E, Tables E-1a through E-1d, present the sampling results. The following is a summary of 2017 in-line trap and solids grab sample data compared to source control screening benchmarks:
• North Lateral/SL4-T5B. Zinc, total HPAHs, and total PCBs were above the SQS/LAET, but were below the CSL/2LAET. Three individual HPAH compounds, BBP, and BEHP were above the CSL/2LAET. Heavy oil was above the Model Toxics Control Act (MTCA) Method A value. While there was a reduction of total HPAHs compared to 2016, there were slight increases in zinc, BEHP, and BBP compared to 2016.
• North central Lateral/SL4-T4A. Total PCBs, lead, and benzo(a)anthracene were above the SQS/LAET, but below the CSL/2LAET. Phenanthrene, eight individual HPAH compounds, total HPAHs, BEHP, BBP, and di-n-octyl phthalate were above the CSL/2LAET. Similar exceedances of screening benchmarks have been observed in past data. Concentrations of total HPAHs and phenanthrene were reduced by about half compared to 2016. There were slight increases in phthalate concentrations compared to 2016.
• South-central Lateral/SL4-T3A. Phenanthrene, nine individual HPAHs, total HPAHs, and BEHP were above the CSL/2LAET in the in-line trap samples. There was insufficient mass in the trap sample to analyze for metals. No parameters had concentrations above the benchmarks in the grab sample.
• South Lateral/SL4-T2A. The in-line trap only had enough sample mass for PCB analysis, which was non-detect at a 60.5-µg/kg detection limit. Zinc and three individual HPAH compounds in the grab sample were above the SQS/LAET, but below the CSL/2LAET. Concentrations of phenanthrene, six individual HPAHs, and total HPAHs in the grab sample were above the CSL/2LAET. In general, there were reductions in zinc, total PCBs, BEHP, and total HPAHs compared to 2016. In accordance with EPA and Ecology requirements, Boeing installed the North Boeing Field (NBF) Stormwater Treatment System at the KCIA north pump station in 2011 to reduce contaminants leaving NBF and entering the LDW at Slip 4. Boeing also rerouted KCIA stormwater to a separate pipe from the north lateral to efficiently treat stormwater from Boeing’s north lateral drainage basin. Boeing continues to treat stormwater, which comprises mostly base flows in NBF and KCIA Slip 4 drainage areas. Boeing also continues to operate and evaluate the system in compliance with their NPDES industrial permit.
In accordance with the NBF/Georgetown Steam Plant Remedial Investigation/Feasibility Study Work Plan, KCIA performed data gap sampling of stormwater structures up-gradient
8 Boeing provides data results for samples SL4-T4A and SL4-T5A/B to EPA, Ecology, and KCIA.
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of the NBF/Georgetown steam plant site in fall 2014. The sampling results were submitted to Ecology in a data gaps report in June 2016 (Cardno 2016). Data showed elevated concentrations of some PAH compounds, BEHP, and zinc compared to source tracing screening benchmark values such as the LAET. A source tracing plan for Slip 4 will be developed in 2018 at KCIA Slip 4 drainage area to determine potential sources of contamination, either at the KCIA or from stormwater up-gradient of the KCIA, which commingles with stormwater at the airport. This plan will be implemented in 2019. Other source tracing and source control activities are included in the MTCA NBF/Georgetown Steam Plant Site remedial investigation activities.
Remediation Activities The following remediation was conducted in 2017 in the Slip 4 area:
• Shultz Fuel Farm Site – 1495 South Hardy Street. In 2017, the tenant continued to monitor the site semiannually to obtain data for cleanup plans. The tenant initially entered the site into Ecology’s Voluntary Cleanup Program and planned to enter another appropriate funding model such as the Washington State Pollution Liability Insurance Agency Program. This program supports owners/operators by meeting financial and environmental cleanup requirements. The tenant plans to perform sampling through 2018.
• Boeing Electronics Manufacturing Facility Site. In November 2017, Boeing conducted bioremediation treatment in selected areas at the site. Boeing intends to conduct additional treatments in 2018.
4.1.3.2 Former Slip 5 Basin The KCIA Former Slip 5 source control area is located in the central area of KCIA. Off-site stormwater from the east (Airport Way−City of Seattle) discharges into the KCIA stormwater system. East Marginal Way in the City of Tukwila also discharges stormwater into the KCIA pipe to the Former Slip 5 outfall.
Sampling and Source Tracing In May 2017, KCIA collected annual in-line trap and grab stormwater solids samples at KCIA2 and South Pump Station (SPS) locations in the Former Slip 5 drainage areas of KCIA. The KCIA2 sampling point, located at the westernmost downgradient structure of the basin, represents KCIA stormwater discharges and tidal backflow from both LDW and East Marginal Way stormwater drainage. The SPS sampling point is more representative of KCIA stormwater drainage than KCIA2. SPS is located in the South Pump Station Pump Vault, which is up-gradient of the large water quality vault used for additional treatment. Appendix E, Table E-2, presents the sampling. The following is a summary of 2017 data compared to screening thresholds:
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• KCIA2. No contaminants, in grab or trap samples, had detected concentrations above the SQS/LAET. Both arsenic and zinc in the grab sample were above SQS/LAET in the previous year. The data suggest source control activities have been effective.
• KCIA SPS. The grab sample only showed total PCB concentrations above the SQS/LAET. All previous years’ monitoring results have shown low PCB concentrations well below the SQS/LAET. It is possible that the increase in total PCBs was attributable to NBF stall construction work. The areas reconstructed include those of known elevated PCB concentrations. Boeing’s replacement of the concrete pads at the reconstructed areas potentially solved the elevated PCB concentrations. It is possible that the PCB increase was attributed to the construction work that released some of the PCBs into the stormwater system downstream into the SPS. Because the elevated PCBs were not observed downstream at the KCIA2 trap or grab location (non-detect results), it may have remained in the KCIA SPS or Water Quality Vault. This allows it to be contained and cleaned in the next round of maintenance. KCIA will continue to observe KCIA2 and SPS sampling locations in the next couple of years to determine if the elevated PCBs continue to indicate an ongoing source. The LDW feasibility study (AECOM 2012) showed some PAH and phthalate concentrations exceeding SQS and/or CSL in sediments nearest the basin’s outfall. Samples farther from the outfall did show SQS exceedance for arsenic and PCBs. As noted above, off-site discharges and tidal backflow from LDW enter the pipe associated with KCIA2. As part of the ISGP, stormwater drainage lines, up-gradient of where KCIA2 is collected, were cleaned in 2016.
Remediation Activities There were no remediation activities in this basin in 2017.
4.1.3.3 Slip 6 Basin The KCIA Slip 6 source control area is located in the south-central area of KCIA. Off-site stormwater from the east (Airport Way–City of Seattle) discharges into the KCIA stormwater system. Other off-site properties such as the Museum of Flight, Airfield Business Center, East Marginal Way (City of Tukwila), Aviation High School, and International Auto Auctions discharge stormwater into the KCIA stormwater pipe, which drains to the Slip 6 outfall.
Sampling and Source Tracing In May 2017, KCIA collected annual in-line trap and grab stormwater solids samples in the Slip 6 drainage areas of KCIA. The KCIA1 sampling point was initially installed at the
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westernmost downgradient structure of the basin in 2009. In 2012, the sampling point was moved to a more up-gradient location to avoid off-site discharges and tidal backflow and relabeled as “KCIA1A”. The KCIA1A sampling point, which has been sampled since 2013, more accurately represents KCIA stormwater discharges to the LDW. Appendix E, Table E- 3, presents sampling results for both locations. The following is a summary of 2017 data compared to screening thresholds:
• KCIA1A. No parameters were above the SQS/LAET benchmarks in the grab sample. The in-line trap had very limited sample mass and was only analyzed for PCBs, which were non-detect at a 585-µg/kg detection limit. The previous year, PCBs were not detected at 20 µg/kg. The LDW feasibility study (AECOM 2012) did not show any sediment exceedances in samples nearest the basin’s outfall, but there were some PAH SQS exceedances within approximately 150 feet of the outfall. Samples collected by Ecology near the outfall showed sediment exceedances for dimethyl phthalate and benzyl alcohol (SAIC 2011).
The grab sample in 2017 had lower concentrations then 2016. Because of very limited mass in the in-line trap sample, comparisons of trap samples to previous years could not be made. KCIA will collect both the trap and grab samples again in 2018, which can then be compared to previous years to determine if additional source tracing is needed. In previous years, PAHs were above screening benchmarks, and in 2016, additional source tracing sampling occurred in three lateral lines in this basin.
Two of the lateral line samples had PAHs above screening benchmarks. The line cleaning completed in 2017 and other BMPs applied at KCIA may have controlled the PAHs or it is possible that the concentrations above benchmarks observed from the 2016 source tracing samples are not leaving the airport drainage system. This is likely attributable to the on- site treatment system that includes a wet vault downstream of the West Lateral sample location and an OWS downstream of all the laterals.
Alternately, there may be a potential off-site source from the East Lateral sample location. Approximately 113 acres of City of Seattle stormwater drainage from Beacon Hill and Airport Way enters the airport Slip 6 drainage basin. Additional assessment of this drainage is planned for 2018.
4.1.3.4 Norfolk CSO/Storm Drain Basin The KCIA Norfolk source control area includes a portion of Perimeter Road and some grassy areas. Off-site stormwater from the east (Airport Way–City of Seattle) and south (Unified Grocers) discharges to a stormwater pipe located within the boundaries of the KCIA property. The pipe extends westward into the Boeing Military Flight Center, connects to the City of Tukwila stormwater drainage system, and discharges to the Norfolk CSO/storm drain outfall in the LDW.
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Sampling and Remediation No sampling was conducted by KCIA in 2017. Past sampling indicated PCB contamination concerns; source control action was taken by Boeing to address the PCB contamination discovered on Boeing property that migrated to the off-site KCIA property. Boeing, EPA, and Ecology continue to address the remaining sources. Post-remediation soil sampling was performed by Boeing in June 2016. In 2017, Boeing began developing a plan to treat stormwater within their site.
4.1.3.5 Stormwater Line Cleaning The 2015 ISGP requires stormwater line cleaning for permitted sites that discharge to the LDW. Line cleaning is performed in conjunction with the current catch basin cleaning schedule.
Stormwater line cleaning was performed in 2017 in the KCIA West Areas (taxiways, parking lots, maintenance shop, airparks, and outfalls.
4.2 Roads Services Division In 2017, the King County Road Services Division continued to maintain roads in the unincorporated area of the LDW source control area. Source control work primarily focused on catch basin inspections and cleaning. Catch basins were physically inspected using protocols developed for the King County NPDES Municipal Permit. The inspections identify catch basins that need cleaning and any physical limitations or maintenance needs. Following catch basin inspections, 70 catch basins were cleaned or underwent sediment removal by a vacuum truck in 2017. An additional 41 catch basins were cleaned through maintenance service requests.
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5.0 OTHER KING COUNTY DEPARTMENTS AND DIVISIONS This section summarizes source control actions taken in 2017 in the LDW drainage area by various King County departments and divisions that have smaller roles in the LDW source area than the County agencies described in previous sections of this report.
5.1 Facilities Management Division This subsection presents source control updates for 2017 for FMD. No additional relevant FMD sites have been discovered in the LDW source control area during construction or normal maintenance.
FMD contracts with WLRD to perform water quality/business BMP inspections and stormwater facility inspections on properties that are under FMD custodial control. Vacant tax title and open space parcels are inspected every five years for water quality compliance. Similarly, all developed parcels are inspected every five years for water quality/business BMP compliance. Annual facility maintenance inspections are performed on all FMD- managed properties with constructed stormwater facilities, such as catch basins or storage and treatment ponds.
Within the LDW source control area, water quality inspections were performed at eight undeveloped properties in 2017 and all were found to be compliant.
Annual stormwater facility inspections in the LDW source control area include the five parcels with buildings and County tenants (Youth Services Center [two parcels], Orcas Building, Barclay-Dean Building, and the Elections Warehouse); three businesses on leased County property fronting on the Duwamish (Manson Construction, Lehigh-Cadman, and Ardagh Glass Company); and one tax title property that is undeveloped except for a stormwater facility. The inspections yielded the following information:
• The 2017 inspection at the Youth Services Detention Facility identified one catch basin covered by debris; this was cleared and the conveyance was cleaned in July 2017.
• The 2017 inspection of the Orcas Building system identified no maintenance needs.
• An April 2017 inspection at Barclay-Dean determined that both catch basins needed sediment removal; this work was performed in October 2017. Tests performed by a City of Seattle contractor before that cleaning identified somewhat elevated levels of PAHs in sediments in the north catch basin. Subsequent testing after the October cleaning was inconclusive because of insufficient sediment in the structures caused by lack of precipitation that might have conveyed additional material to the
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structures. King County and the City of Seattle will continue to monitor this location in 2018.
• The three catch basins at the Elections Warehouse were inspected and found to be compliant in 2017.
• The inspection at Manson Construction identified two catch basins that needed cleaning; this was accomplished by June 2017.
• The Lehigh-Cadman inspection found two catch basins in need of cleaning, which was accomplished in 2017.
• The Ardagh facility was compliant after one catch basin was cleaned in 2017.
• The vacant parcel was found to be compliant, with no maintenance required in 2017.
5.2 Department of Permitting and Environmental Review DPER provides two primary services for unincorporated King County and KCIA that are directly aimed at controlling the release of contaminants from development sites. DPER reviews and issues development and use permits and inspects the permits for compliance with plans and conditions of permit approval. Table 9 shows the number of permits and final construction approvals in 2017 for projects that could potentially introduce or mobilize contaminants.
DPER Permitting/Inspection Activity in 2016. Number of Permits Number of Final Construction Construction Type Approved Approvals Residential 22 14 Business/Commercial 3 2 Industrial – KCIA 4 2 Industrial – Other 1 2 Total 30 20
Projects approved in 2017 were as follows:
• Residential: three tank removal projects, eight new single-family residences, nine additions, one demolition project, and one retaining wall project. • Business/commercial: one demolition project, one condominium addition, and one school addition. • Industrial development outside of KCIA: one manufacturing building permit.
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• Redevelopment at KCIA: two building additions, one demolition project, one site grading project. Final construction was completed for six of the permits approved in 2017. Fourteen projects achieving final construction in 2017 were approved before 2017.
5.3 Environmental Health Services Division This section summarizes activities related to source control in Public Health’s Environmental Health Services Division regulatory programs to (1) administer and enforce state and local regulations governing the safe handling of solid waste and (2) minimize potential human and environmental exposures to sewage and chemicals released from properties that have on-site sewage (septic) systems in the LDW drainage basin.
5.3.1 Public Health–Seattle & King County Solid Waste Program Twenty-five percent of all permitted solid waste facilities and approximately 30 percent of all permit-exempt solid waste facilities in King County are located in the LDW drainage basin.
5.3.1.1 Permitted Facilities Figure 2 shows the locations of permitted and exempt solid waste facilities and illegal dumping complaints in the LDW drainage basin during 2017. Table 10 lists the permitted facilities within the LDW drainage basin. The Solid Waste Program’s solid waste permit approval and enforcement activities in 2017 in the LDW drainage area are as follows:
• There were 10 permitted solid waste facilities and 30 solid waste facilities exempt from permitting that discharge into the LDW drainage basin (Figure 2).
• For the permitted facilities, Public Health reviews site schematics, evaluates operational plans, issues permits, monitors operations, and performs routine inspections. The program received a notification of intent to operate under a solid waste exemption from Drywall Recycling Services (previously known as CDL Recycle) to recycle metal, wood, and concrete. The program also collaborated with multiple agencies, including Ecology, Seattle Department of Construction and Inspection, and KCIW, to review the solid waste material recovery facilities permit application for the Drywall Recycling Services’ Seattle facility located at 7201 East Marginal Way South. Drywall Recycling Services proposed to accept and process loads of mixed construction and demolition debris. Finally, the program reviewed the solid waste application for Emerald Services, Inc., located at 1500 Airport Way South in Seattle; Emerald Services had originally operated as an exempt facility for many years. Ecology determined that Emerald
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Services would need a solid waste handling permit to consolidate and solidify non- hazardous waste. No permits were issued this year because both the permit applications for Drywall Recycling Services and Emerald Services were still being processed at the end of 2017.
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Figure 2. Sites with Regulatory Oversight by Public Health Solid Waste Program.
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Solid Waste Facilities in the LDW Drainage Basin Permitted by Public Health in 2017.
Name Type of Facility Site Address South Transfer Station Municipal transfer station 8100 Second Ave. S (SPU) and recycling Seattle, WA 98108 South Recycle & Disposal Municipal transfer station 130 South Kenyon St. Station (SPU) Seattle, WA 98108 South Seattle Household Moderate risk waste 8100 Second Ave. S Hazardous Waste Facility processing facility Seattle, WA 98108
Eastmont Waste Municipal transfer station 7201 W Marginal Way SW Management Seattle, WA 98108 (Waste Management) Alaska Street Reload and Solid waste piles that accept 70 S Alaska St. Recycling dredged materials and Seattle, WA 98134 petroleum-contaminated soils Lafarge Solid waste piles that accept 5400 W Marginal Way SW dredged materials and Seattle, WA 98106 petroleum-contaminated soils Seattle City Light South Moderate-risk waste 3613 Fourth Ave. S Service Center processing facility Seattle, WA 98134 Cleanscapes (A Recology Material recovery facility for 4401 E Marginal Way S Company) curbside recyclables Seattle, WA 98134 Waste Management Biomedical waste treatment 149 SW Kenyon St. Biomedical Waste facility Seattle, WA 98108 Treatment Facility United Recycling Seattle Materials recovery facility for 80 S. Hudson St. construction and demolition Seattle, WA 98134 waste
5.3.1.2 Permit Violations Permit violations in 2017 were as follows:
In 2017, eight violations from permitted solid waste facilities, permit-exempt facilities, and solid waste transporters were documented. Some of the violations noted were as follows: vehicles must have current permit, vehicles should not be leaking leachate or oil, odors leaving the parking area, inadequate fugitive dust control, and not following protocols for moderate-risk waste handling.
5.3.1.3 Illegal Dumping Complaints Figure 2 shows the locations of complaints of unlawful dumping of solid waste around the LDW area in 2017. Staff visited these sites to assess conditions and to educate the
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owners on how to comply with King County Board of Health code. If no action was taken after a follow-up letter, Public Health enforced compliance as necessary and appropriate.
5.3.2 Public Health–Seattle & King County On-Site Wastewater Program Public Health administers and enforces the "on-site" (i.e., on the property) sewage (septic) code. These regulatory standards are intended to minimize human and environmental exposure to sewage from on-site sewage systems. The following summarizes the program’s activities related to source control in the LDW drainage area in 2017:
• Number of septic systems. In the County’s LDW SCIP, Public Health reported 45 known properties with septic systems in the source control area, primarily in the City of Seattle. In 2015, the On-Site Wastewater Program began tracking the number of properties with septic systems in King County. As of August 22, 2018, the program identified 1,413 properties that are likely served by septic systems in the LDW drainage basin. Most of these are outside of the City of Seattle and have been in place for many years. The number of systems and the number of properties (or parcels) should be equal because, in most cases, there is only one system (i.e., one house) per parcel. One home was reported to abandon its septic system in 2017 and at that time was connected to the city sewer.
• Failing septic systems. In 2017, the program received four complaints of possible failing septic systems in the LDW drainage basin. Three of these complaints were closed because there was no evidence of obvious failure of a septic system or the system had a small problem that was repaired. One complaint was a confirmed failure of the septic system, which was subsequently repaired under permit and the case closed. Two additional complaints were still open from previous years; however, one septic system was inspected and found not to be failing at the time of inspection. • New septic systems. In 2017, one septic system installation permit was issued for a new house. The system has been installed. The last step of an installation of a septic system under permit, whether it represents a new system or a repair, is the approval of the “as-built” for the work completed. The as-built shows the system location, type, tank location, reserve area location, and other features. This system has not submitted the as-built for approval yet.
• Septic system repairs. In 2017, the program received seven full-repair permit applications, including approved site applications in the LDW drainage basin; three of the seven full repairs have been installed and are awaiting as-builts as the final step of completion. The other four full repairs have had an approved as-built. The two full repairs from the previous year have both had their as-builts approved and cases closed.
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5.4 Solid Waste Division SWD SCIP activities in the LDW drainage basin in 2017 involved the work of the King County Brownfields Program.9
Between 2008 and 2017, one project in the LDW drainage basin received extensive assistance from the Brownfields Program and EPA. The site, located in the Georgetown neighborhood of the City of Seattle, was formerly a gas station. Seattle-based artist collaborative SuttonBeresCuller (SBC) formed a 501(c)(3) nonprofit and purchased the property in 2013 to transform it into a pocket park and arts-oriented community center, called the Mini-Mart City Park.
Past assistance provided to the site includes the following:
• A 2008 Phase I Environmental Site Assessment that identified recognized environmental conditions, including the following: a former service station operation at the site that represented a potential source of petroleum contamination to soil and groundwater; pesticide residues that may have migrated through groundwater to the property from current and historical commercial nurseries located 500 feet northeast of the site; and total petroleum hydrocarbons (for gasoline and benzene, toluene, ethylbenzene and xylene) detected in groundwater from former underground storage tanks located at the KCIA maintenance shop located hydraulically up-gradient from the site.
• A 2009 geophysical investigation that identified as many as five potential underground storage tank sites and confirmed gasoline and diesel-range petroleum hydrocarbons in soil and groundwater at concentrations that exceeded Ecology MTCA Method A cleanup levels. The investigation did not find significant impacts from solvents or pesticides.
• A 2010 to 2011 EPA Targeted Brownfields Assessment (TBA) conducted by EPA contractor EIGov that conducted additional sampling to further characterize the site. The TBA detected a contaminated groundwater plume trending southwesterly off the site.
• A 2017 Supplemental Phase II Environmental Site Assessment that obtained additional groundwater data up-gradient and downgradient of the site that better defined the extent of petroleum‐related groundwater contamination. This investigation determined that the petroleum-contaminated groundwater was not extensive and would be amenable to remediation by installation of a vapor barrier and mitigation/treatment system at the appropriate stage of construction.
9 The County’s Brownfields Program is no longer in operation.
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As of May 2018, former building structures and underground storage tanks had been removed from the site, and SBC has been working with environmental consultant G-Logics to develop and install a combination air-sparge and soil-vapor extraction system to address the petroleum contamination below the property. The system, which will be incorporated into the first phase of construction, is designed to initiate remediation of residual petroleum contaminants on the property and to mitigate vapor intrusion into the site buildings. SBC held a groundbreaking ceremony for the Mini-Mart City Park in July 2018.
More information about the Mini-Mart City Park is available at https://www.minimartcitypark.com/. More information about past work of the King County Brownfields Program is available at https://kingcounty.gov/depts/dnrp/solid- waste/programs/brownfields.aspx.
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6.0 REFERENCES AECOM. 2012. Final Feasibility Study Lower Duwamish Waterway, Seattle, Washington. Prepared for Lower Duwamish Waterway Group for submittal to U.S. Environmental Protection Agency, Seattle, WA, and Washington State Department of Ecology, Bellevue, WA. Prepared by AECOM, Seattle, WA. October 2012.
Cardno. 2016. North Boeing Field/Georgetown Steamplant Remedial Investigation/Feasibility Study: Data Summary Report of Stormwater Solids Assessment King County International Airport. Prepared for King County International Airport by Cardno GS, Inc., Government Services Division, Seattle, WA. June 2016.
Ecology. 2014. Lower Duwamish Waterway Source Control Status Report January through December 2013. Publication #14-09-337. Prepared by Washington State Department of Ecology, Toxics Cleanup Program, Bellevue, WA. June 2014.
Ecology. 2016. Lower Duwamish Waterway Source Control Strategy. Prepared by Washington State Department of Ecology, Toxics Cleanup Program, Bellevue, WA.
EPA. 2014. Record of Decision: Lower Duwamish Waterway Superfund Site. Prepared by U.S. Environmental Protection Agency, Region 10, Seattle, WA. November 2014.
King County. 2011. Lower Duwamish Waterway Source Control Brandon Combined Sewer Basin Study – Sampling and Analysis Plan. Prepared by Dean Wilson, Water and Land Resources Division, Seattle, WA.
King County. 2013. Lower Duwamish Waterway Source Control Michigan Combined Sewer Basin Study – Sampling and Analysis Plan Addendum. Prepared by Richard Jack and Debra Williston, Water and Land Resources Division, Seattle, WA.
King County. 2015. Green River PCB Equipment Blank Study – Sampling and Analysis Plan. Prepared by Debra Williston, Water and Land Resources Division, Science and Technical Support Section, Seattle, WA.
King County, 2016a. King County Lower Duwamish Waterway Source Control Implementation Plan 2014-2018. Prepared for Washington State Department of Ecology, Seattle, WA.
King County 2016b. King County Lower Duwamish Waterway Source Control 2014-2015 Annual Report. Prepared by Department of Natural Resources and Parks, Department of Transportation, and Department of Executive Services, Seattle, WA.
King County 38 December 2018 King County Lower Duwamish Waterway Source Control Annual Report - 2017
King County. 2016c. Lower Duwamish Source Control: Brandon Combined Sewer Basin Study Data Report. Prepared by Richard Jack, Carly Greyell, and Debra Williston, King County Water and Land Resources Division, Science and Technical Support Section, Seattle, WA.
King County. 2017a. Georgetown Wet Weather Treatment Station: Excavated Material and Sediment Characterization – Data Summary Report. Prepared by Carly Greyell and Debra Williston, King County Water and Land Resources Division, Science Section. Seattle, Washington.
King County. 2017b. Lower Duwamish Source Control: Michigan Combined Sewer Basin Study Data Report. Prepared by Carly Greyell and Debra Williston, King County Water and Land Resources Division, Science and Technical Support Section. Seattle, Washington.
King County. 2017c. King County Lower Duwamish Waterway Source Control 2016 Annual Report. Prepared by Department of Natural Resources and Parks, Department of Transportation, and Department of Executive Services. Seattle, Washington
King County. 2018. Combined Sewer Overflow Control Program; 2017 Annual CSO and Consent Decree Report. Prepared by King County Wastewater Treatment Division, Seattle, WA
SAIC. 2011. Surface Sediment Sampling at Outfalls in the Lower Duwamish Waterway Seattle, WA Data Report. Prepared for Washington State Department of Ecology, Seattle, WA. October 2011.
Windward. 2018. Lower Duwamish Waterway Surface Sediment Data Report. Prepared for Lower Duwamish Waterway Group for submittal to U.S. Environmental Protection Agency, Seattle, WA. Prepared by Windward Environmental LLC, Seattle, WA.
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Appendix A: KCIW Industrial Users
LDW Source Control Annual Report King County December 2018
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Table A-1: Active Industrial Users within the LDW Drainage Basin in 2017
Facility Name Treatment Plant CSO Basin Authorization Type Permit Customer Type American Property Development - LARC at Burien Construction PrWEST POINT 8th Ave LETTER OF AUTHORIZATION 11789-01 CONSTRUCTION DEWATERING Beckwith & Kuffel Inc. - Remediation Construction Project SOUTH TREATMENT PLANT 8th Ave MINOR DISCHARGE AUTHORIZATION 11795-01 GROUNDWATER REMEDIATION - ORGANICS Coast Crane Company WEST POINT 8th Ave MINOR DISCHARGE AUTHORIZATION 788-02 PRESSURE WASHING First Student Inc. WEST POINT 8th Ave LETTER OF AUTHORIZATION 11768-01 VEHICLE WASHING Flying Fish Express WEST POINT 8th Ave MINOR DISCHARGE AUTHORIZATION 783-02 FOOD PROCESSING-FISH Gary Merlino Construction Co. Inc. WEST POINT 8th Ave LETTER OF AUTHORIZATION 11117-02 VEHICLE WASHING Industrial Container Services - WA LLC WEST POINT 8th Ave PERMIT 7929-01 BARREL CLEANING Kerry Inc. WEST POINT 8th Ave PERMIT 7854-02 FOOD PROCESSING-OTHER Magnetic and Penetrant Services Co. WEST POINT 8th Ave PERMIT 7873-02 METAL FINISHING - CFR 433 National Products Inc. WEST POINT 8th Ave PERMIT 7834-02 METAL FINISHING - CFR 433 PACO Ventures LLC WEST POINT 8th Ave LETTER OF AUTHORIZATION 11702-01 GENERAL TYPE Piroshky Baking Company LLC WEST POINT 8th Ave LETTER OF AUTHORIZATION 11785-01 FOOD PROCESSING-OTHER Samson Tug and Barge Inc. - 9228 Tenth Avenue WEST POINT 8th Ave MAJOR DISCHARGE AUTHORIZATION 4406-01 CONTAINER WASHING Sea Mar Community Health Centers - Vault Excavation ConstructioWEST POINT 8th Ave GLA-CONSTRUCTION 40111-01 CONSTRUCTION DEWATERING Seattle Housing Authority - Maintenance Facility WEST POINT 8th Ave LETTER OF AUTHORIZATION 10399-03 VEHICLE WASHING Seattle, City of - Joint Training Facility WEST POINT 8th Ave LETTER OF AUTHORIZATION 10849-03 GENERAL TYPE Seattle, City of - SPU - South Transfer Station WEST POINT 8th Ave MAJOR DISCHARGE AUTHORIZATION 4404-01 SOLID WASTE - TRANSFER FAC Seattle, City of - SPU - Storm Drainage Basin Cleaning Decant Site WEST POINT 8th Ave MAJOR DISCHARGE AUTHORIZATION 4425-01 CONSTRUCTION DEWATERING South Park Industrial Properties LLC SOUTH TREATMENT PLANT 8th Ave MAJOR DISCHARGE AUTHORIZATION 4086-03 GROUNDWATER REMEDIATION - ORGANICS The Gear Works WEST POINT 8th Ave PERMIT 7892-01 METAL FINISHING - CFR 433 United Site Services WEST POINT 8th Ave LETTER OF AUTHORIZATION 11772-01 PRESSURE WASHING Washington Liftruck WEST POINT 8th Ave MINOR DISCHARGE AUTHORIZATION 806-02 PRESSURE WASHING Waste Management Inc. - Eastmont Transfer Station WEST POINT 8th Ave MINOR DISCHARGE AUTHORIZATION 322-06 SOLID WASTE - TRANSFER FAC Waste Management Inc. - Seattle WEST POINT 8th Ave MINOR DISCHARGE AUTHORIZATION 785-04 CONTAINER WASHING Lineage Seafreeze WEST POINT 8th Ave or Terminal 115 PERMIT 7896-01 FOOD PROCESSING-SEAFOOD Northland Services Inc. WEST POINT 8th Ave or Terminal 115 LETTER OF AUTHORIZATION 10742-02 PRESSURE WASHING Ardagh Glass Inc. WEST POINT Brandon MAJOR DISCHARGE AUTHORIZATION 555-05 GLASS MANUFACTURING Art Brass Plating Inc. WEST POINT Brandon PERMIT 7722-05 METAL FINISHING - CFR 433 Cadman (Seattle) Inc. WEST POINT Brandon MAJOR DISCHARGE AUTHORIZATION 4235-02 CEMENT/READYMIX Can Do Services LLC - Dawson St. WEST POINT Brandon LETTER OF AUTHORIZATION 11685-01 CONTAINER WASHING Foster's Frame & Axle WEST POINT Brandon MINOR DISCHARGE AUTHORIZATION 948-01 VEHICLE WASHING General Electric Co. - Dawson Street WEST POINT Brandon MAJOR DISCHARGE AUTHORIZATION 543-04 GROUNDWATER REMEDIATION - ORGANICS Kamco Seafood Inc. WEST POINT Brandon MINOR DISCHARGE AUTHORIZATION 739-03 FOOD PROCESSING-FISH Seadrunar Recycling WEST POINT Brandon LETTER OF AUTHORIZATION 11430-01 METALS RECYCLING Seattle, City of - SPU - Materials Storage Yard WEST POINT Brandon MAJOR DISCHARGE AUTHORIZATION 774-03 GENERAL TYPE United Rentals - Seattle WEST POINT Brandon LETTER OF AUTHORIZATION 11436-01 GENERAL TYPE Georgetown Brewing Co. WEST POINT Brandon or Duwamish MAJOR DISCHARGE AUTHORIZATION 4154-02 FOOD PROCESSING-BREWERY Seattle Housing Authority - Red Cedar Construction Project WEST POINT Connecticut, Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 1062-01 CONSTRUCTION DEWATERING Yesler Investors 2 LLC - Yesler Terrace Block 2 Construction ProjecWEST POINT Connecticut, Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 1040-01 CONSTRUCTION DEWATERING Harborview Medical Center WEST POINT Connecticut,Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 712-04 HOSPITAL Boren & Spruce LLC Construction Project WEST POINT Connecticut/Hanford 1 and 2/Lander GLA-CONSTRUCTION 40104-01 CONSTRUCTION DEWATERING Vulcan Inc. - Yesler 3 Construction Project WEST POINT Connecticut/Hanford 1&2/Lander MINOR DISCHARGE AUTHORIZATION 1071-01 CONSTRUCTION DEWATERING Providence Health and Services - Boylston Triangle Construction PWEST POINT Denny, Dexter, Hanford 1/2 or Lander GLA-CONSTRUCTION 40037-01 CONSTRUCTION DEWATERING Seattle Academy of Arts and Sciences Cardinal Union Building ConWEST POINT Denny, Dexter, Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 1056-01 CONSTRUCTION DEWATERING Ash Grove Cement Company WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4009-05 CEMENT/READYMIX Auto-Chlor System WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4428-02 MANUFACTURING-MISC Bloch Steel Industries WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4085-04 GROUNDWATER REMEDIATION - PETROLEUM Cascade Designs Inc. WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4179-02 METAL FABRICATION Cascade Machinery and Electric Inc. WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 802-02 GENERAL TYPE
Appendix A: LDW Source Control Annual Report Page 1 of 3 King County December 2018 Table A-1: Active Industrial Users within the LDW Drainage Basin in 2017
Facility Name Treatment Plant CSO Basin Authorization Type Permit Customer Type ConGlobal Industries Inc. WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 932-01 PRESSURE WASHING Field Roast Grain Meat Co. - Seventh Ave. WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4417-01 FOOD PROCESSING-MEATS Grand Central Bakery - Nevada Street WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 1073-01 FOOD PROCESSING-BAKERY MacMillan-Piper Inc. - Edmunds Street Facility WEST POINT Duwamish LETTER OF AUTHORIZATION 10638-03 GENERAL TYPE North Star Casteel Products Inc. WEST POINT Duwamish LETTER OF AUTHORIZATION 11557-01 METAL FABRICATION Northwest Container Services Inc. - Seattle Intermodal Yard WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 964-01 CONTAINER WASHING Schwartz Brothers Bakery - Seattle WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 743-04 FOOD PROCESSING-BAKERY Schwartz Brothers Bakery - Seattle WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 743-05 FOOD PROCESSING-BAKERY Seattle Barrel Co. WEST POINT Duwamish PERMIT 7113-04 BARREL CLEANING Seattle Radiator LLC WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 796-02 RADIATOR REPAIR Stoneway Concrete - Seattle WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 232-05 CEMENT/READYMIX Two Beers Brewing Company LLC WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4431-01 FOOD PROCESSING-BREWERY Union Pacific Railroad - Argo Yard WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 668-05 VEHICLE WASHING United Parcel Service Inc. - Seattle WEST POINT Duwamish MAJOR DISCHARGE AUTHORIZATION 4020-04 VEHICLE WASHING Waste Management Inc. - Alaska Street Facility WEST POINT Duwamish MINOR DISCHARGE AUTHORIZATION 691-04 SOLID WASTE - TRANSFER FAC Alaska Marine Lines Inc. WEST POINT Duwamish West MINOR DISCHARGE AUTHORIZATION 459-04 CONTAINER WASHING Chemithon Corporation WEST POINT Duwamish West MAJOR DISCHARGE AUTHORIZATION 4112-03 MANUFACTURING-MISC Encore Oils LLC WEST POINT Duwamish West MAJOR DISCHARGE AUTHORIZATION 4405-01 RENDERING FOG-TITE Meter Seal Inc. WEST POINT Duwamish West MINOR DISCHARGE AUTHORIZATION 815-02 CEMENT/READYMIX Glacier Northwest Inc. - Vehicle Washing WEST POINT Duwamish West MINOR DISCHARGE AUTHORIZATION 510-04 VEHICLE WASHING LMV Interbay Holdings LLC - 3230 16th Ave. W. Construction ProjeWEST POINT Duwamish West GLA-CONSTRUCTION 40018-01 CONSTRUCTION DEWATERING Lafarge - Seattle Plant WEST POINT Duwamish West PERMIT 7925-01 SOLID WASTE - TRANSFER FAC Rainier Petroleum Corp. WEST POINT Duwamish West MINOR DISCHARGE AUTHORIZATION 536-05 FUELING FACILITY Surplus Items Inc. WEST POINT Duwamish West MAJOR DISCHARGE AUTHORIZATION 266-07 GROUNDWATER REMEDIATION - OTHER TLP Management Services LLC WEST POINT Duwamish West PERMIT 7592-05 FUELING FACILITY Vigor Shipyards Inc. WEST POINT Duwamish West PERMIT 7782-07 BOAT/SHIPYARD Westway Feed Products LLC WEST POINT Duwamish West MINOR DISCHARGE AUTHORIZATION 952-01 MANUFACTURING-MISC VA Puget Sound Healthcare System - Seattle Division WEST POINT DUWAMISH,HANFORD 1/2,LANDER,MICHIGAMINOR DISCHARGE AUTHORIZATION 818-02 HOSPITAL VA Puget Sound Healthcare System - Mental Health and Research WEST POINT DUWAMISH-HANFORD ½-LANDER-MICHIGANMINOR DISCHARGE AUTHORIZATION 1037-01 CONSTRUCTION DEWATERING Boeing Company - Plant 2 Facility WEST POINT E Marginal PERMIT 7811-04 METAL FINISHING - CFR 433 Boeing Defense, Space & Security - Developmental Center WEST POINT E Marginal MAJOR DISCHARGE AUTHORIZATION 526-06 MANUFACTURING-MISC Boeing Integrated Defense Systems - Military Flight Center WEST POINT E Marginal LETTER OF AUTHORIZATION 11764-02 VEHICLE WASHING Can Do Services LLC - E. Marginal Way SOUTH TREATMENT PLANT E Marginal LETTER OF AUTHORIZATION 11695-01 CONTAINER WASHING Container Properties LLC WEST POINT E Marginal MAJOR DISCHARGE AUTHORIZATION 4167-02 GROUNDWATER REMEDIATION - ORGANICS Boeing Commercial Airplane - North Field WEST POINT E Marginal or Michigan PERMIT 7594-06 METAL FINISHING - CFR 433 Boeing North Field Facility - PCB Treatment System for Duwamish WEST POINT E Marginal or Michigan MAJOR DISCHARGE AUTHORIZATION 4223-02 WATER TREATMENT Cucina Fresca Gourmet Foods WEST POINT E Marginal or Michigan MINOR DISCHARGE AUTHORIZATION 891-01 FOOD PROCESSING-OTHER King County International Airport - Boeing Field WEST POINT E Marginal or Michigan MAJOR DISCHARGE AUTHORIZATION 4109-03 TRANSPORTATION FACILITY King County International Airport - GWR WEST POINT E Marginal or Michigan MAJOR DISCHARGE AUTHORIZATION 4129-04 GROUNDWATER REMEDIATION - PETROLEUM Quad 7 Development LLC/Signature Flight Support WEST POINT E Marginal or Michigan MINOR DISCHARGE AUTHORIZATION 849-02 VEHICLE WASHING Capitol Hill Housing - Liberty Bank Building WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40119-01 CONSTRUCTION DEWATERING Country Doctor Community Health Centers Construction Project WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40102-01 CONSTRUCTION DEWATERING Jackson Investors South LLC - Jackson Apartments Construction PrWEST POINT Hanford 1 and 2/Lander MAJOR DISCHARGE AUTHORIZATION 1076-01 CONSTRUCTION DEWATERING MBS LLC - Mount Baker Station Apartments North Construction P WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40125-01 CONSTRUCTION DEWATERING MBS LLC - Mount Baker Station Apartments South Construction P WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40126-01 CONSTRUCTION DEWATERING Mount Baker Housing Association - 2530 Construction Project WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40108-01 CONSTRUCTION DEWATERING Mount Baker Housing Association - 2540 Construction Project WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40109-01 CONSTRUCTION DEWATERING Mount Baker Housing Association - 2554 Construction Project WEST POINT Hanford 1 and 2/Lander GLA-CONSTRUCTION 40107-01 CONSTRUCTION DEWATERING 718 Rainier LLC Construction Project WEST POINT Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 1067-01 CONSTRUCTION DEWATERING
Appendix A: LDW Source Control Annual Report Page 2 of 3 King County December 2018 Table A-1: Active Industrial Users within the LDW Drainage Basin in 2017
Facility Name Treatment Plant CSO Basin Authorization Type Permit Customer Type BSOP3 LLC - 1001 Broadway Construction Project WEST POINT Hanford 1/2 or Lander GLA-CONSTRUCTION 40009-01 CONSTRUCTION DEWATERING Franz-Gai's Bakery - Weller St. WEST POINT Hanford 1/2 or Lander MAJOR DISCHARGE AUTHORIZATION 4296-01 FOOD PROCESSING-BAKERY Jefferson Park LLC - Jefferson Park Construction Project WEST POINT Hanford 1/2 or Lander GLA-CONSTRUCTION 40081-01 CONSTRUCTION DEWATERING King County FMD - Children and Family Justice Center ConstructioWEST POINT Hanford 1/2 or Lander MAJOR DISCHARGE AUTHORIZATION 4383-01 CONSTRUCTION DEWATERING King's Oriental Foods Co. WEST POINT Hanford 1/2 or Lander LETTER OF AUTHORIZATION 11766-01 FOOD PROCESSING-OTHER LabCorp/Dynacare Laboratories WEST POINT Hanford 1/2 or Lander LETTER OF AUTHORIZATION 11784-01 LABORATORY Northwest Tofu Inc. WEST POINT Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 1044-01 FOOD PROCESSING-OTHER Penthouse Drapery Cleaners and Manufacturers Former Property WEST POINT Hanford 1/2 or Lander LETTER OF AUTHORIZATION 1065-01 GROUNDWATER REMEDIATION - ORGANICS Photographic Center Northwest WEST POINT Hanford 1/2 or Lander LETTER OF AUTHORIZATION 11531-01 PHOTO PROCESSING Rainier Commons LLC - Old Rainier Brewery Site WEST POINT Hanford 1/2 or Lander PERMIT 7927-01 GENERAL TYPE Ralph's Concrete Pumping, Inc. - Rainier Avenue WEST POINT Hanford 1/2 or Lander LETTER OF AUTHORIZATION 11760-01 CEMENT/READYMIX Seattle University - Onsite Compost Facility WEST POINT Hanford 1/2 or Lander LETTER OF AUTHORIZATION 11179-02 COMPOSTING-YARD WASTE Seattle University Student Housing Construction Project WEST POINT Hanford 1/2 or Lander MAJOR DISCHARGE AUTHORIZATION 4413-01 CONSTRUCTION DEWATERING Sound Transit - E130 East Link Extension SPU Discharge Locations WEST POINT Hanford 1/2 or Lander MAJOR DISCHARGE AUTHORIZATION 4439-01 CONSTRUCTION DEWATERING Sound Transit Operations and Maintenance Facility WEST POINT Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 801-03 TRANSPORTATION FACILITY Swedish Medical Center - Cherry Hill WEST POINT Hanford 1/2 or Lander MINOR DISCHARGE AUTHORIZATION 707-04 HOSPITAL University of Washington Consolidated Laundry WEST POINT Hanford 1/2 or Lander MAJOR DISCHARGE AUTHORIZATION 4301-01 LAUNDRY - LINEN Cascade Columbia Distribution WEST POINT Michigan MAJOR DISCHARGE AUTHORIZATION 4156-02 CONTAINER WASHING Ceradyne Inc., a 3M Company - Seattle WEST POINT Michigan PERMIT 7507-05 GLASS MANUFACTURING Classic Impressions Inc. WEST POINT Michigan LETTER OF AUTHORIZATION 11777-01 GENERAL TYPE Dawn Food Products WEST POINT Michigan LETTER OF AUTHORIZATION 11009-02 FOOD PROCESSING EcoChemical Inc. WEST POINT Michigan MINOR DISCHARGE AUTHORIZATION 918-01 GENERAL TYPE Elysian Brewing Company - Airport Way S. WEST POINT Michigan MAJOR DISCHARGE AUTHORIZATION 4211-03 FOOD PROCESSING-BREWERY Emerald, An Environmental Company - Brighton Facility WEST POINT Michigan MAJOR DISCHARGE AUTHORIZATION 4372-01 FUEL - BULK STORAGE Evergreen Tractor LLC WEST POINT Michigan LETTER OF AUTHORIZATION 11008-02 VEHICLE WASHING FleetMasters Inc. WEST POINT Michigan LETTER OF AUTHORIZATION 11704-01 VEHICLE WASHING King County WTD - Georgetown Wet Weather Treatment Station WEST POINT Michigan MAJOR DISCHARGE AUTHORIZATION 4424-02 CONSTRUCTION DEWATERING King County WTD - Georgetown Wet Weather Treatment Station WEST POINT Michigan PERMIT 7937-01 CONSTRUCTION DEWATERING Marine Vacuum Service Inc. WEST POINT Michigan PERMIT 7676-06 CENTRALIZED WASTE TREATMENT-CFR 437 Northwest Porosity & Heat Treat LLC WEST POINT Michigan LETTER OF AUTHORIZATION 11173-02 MANUFACTURING-MISC Prologis - Georgetown Crossroads LLC - Sounder Construction ProWEST POINT Michigan MAJOR DISCHARGE AUTHORIZATION 4408-01 CONSTRUCTION DEWATERING Recology CleanScapes Inc. WEST POINT Michigan MINOR DISCHARGE AUTHORIZATION 850-03 CONTAINER WASHING Seattle Iron and Metals Corp. WEST POINT Michigan MINOR DISCHARGE AUTHORIZATION 750-03 VEHICLE WASHING Seattle Iron and Metals Corp. - 730 South Myrtle Construction ProWEST POINT Michigan LETTER OF AUTHORIZATION 11780-01 CONSTRUCTION DEWATERING Waste Management National Services - 8th Avenue South Reload WEST POINT Michigan PERMIT 7928-02 SOLID WASTE - TRANSFER FAC Affordable Auto Wrecking SOUTH TREATMENT PLANT Norfolk MAJOR DISCHARGE AUTHORIZATION 4134-02 GENERAL TYPE Coluccio Construction WEST POINT Norfolk MINOR DISCHARGE AUTHORIZATION 779-03 VEHICLE WASHING Hutyler Consulting - 37th SFR Construction Project WEST POINT Norfolk GLA-CONSTRUCTION 40006-01 CONSTRUCTION DEWATERING Northwest Gourmet Food Products Inc. - Seattle Facility WEST POINT Norfolk MINOR DISCHARGE AUTHORIZATION 784-02 FOOD PROCESSING-OTHER OHNO Construction Company WEST POINT Norfolk LETTER OF AUTHORIZATION 11279-02 PRESSURE WASHING Starline Luxury Coaches WEST POINT Norfolk LETTER OF AUTHORIZATION 11528-01 VEHICLE WASHING Seattle, City of - SPU - West Seattle Decant Station WEST POINT West Michigan MAJOR DISCHARGE AUTHORIZATION 416-05 DECANT STATION
Appendix A: LDW Source Control Annual Report Page 3 of 3 King County December 2018 Table A-2: KCIW Inspections in LDW Basin for 2017
Authorization Facility Number Discharge Authorizations KING COUNTY FMD - CHILDREN AND FAMILY JUSTICE CENTER CONSTRUCTION PROJECT 4383-01 RECOLOGY CLEANSCAPES INC. 850-03 SEATTLE, CITY OF - SPU - MATERIALS STORAGE YARD 774-02 718 RAINIER LLC CONSTRUCTION PROJECT 1067-01 BOEING NORTH FIELD FACILITY - PCB TREATMENT SYSTEM FOR DUWAMISH AREA BOEING FACILITIES 4223-01 CADMAN (SEATTLE) INC. 4235-01 CLASSIC IMPRESSIONS INC. 860-01 COLUCCIO CONSTRUCTION 779-03 FIELD ROAST GRAIN MEAT CO. - SEVENTH AVE. 4417-01 FIRST STUDENT INC. 854-01 HARBORVIEW MEDICAL CENTER 712-03 KING COUNTY INTERNATIONAL AIRPORT - GWR 4129-04 KING COUNTY WTD - GEORGETOWN WET WEATHER TREATMENT STATION 4402-01 LABCORP/DYNACARE LABORATORIES 704-04 PIROSHKY BAKING COMPANY LLC 200083-01 PROLOGIS - GEORGETOWN CROSSROADS LLC - SOUNDER CONSTRUCTION PROJECT 4408-01 QUAD 7 DEVELOPMENT LLC/SIGNATURE FLIGHT SUPPORT 849-01 SAMSON TUG AND BARGE INC. - 9228 TENTH AVENUE 4406-01 SEATTLE HOUSING AUTHORITY - RED CEDAR CONSTRUCTION PROJECT 1062-01 SEATTLE, CITY OF - JOINT TRAINING FACILITY 10849-02 SEATTLE, CITY OF - SPU - STORM DRAINAGE BASIN CLEANING DECANT SITE 4425-01 SOUND TRANSIT - E130 EAST LINK EXTENSION SPU DISCHARGE LOCATIONS CONSTRUCTION PROJECT 4439-01 SURPLUS ITEMS INC. 266-07 SWEDISH MEDICAL CENTER - CHERRY HILL 707-03 TWO BEERS BREWING COMPANY LLC 4431-01 UNITED PARCEL SERVICE INC. - SEATTLE 4020-03 NORTHWEST TOFU INC. 1044-01
Permits ART BRASS PLATING INC. 7722-05 BOEING COMMERCIAL AIRPLANE - NORTH FIELD 7594-06 BOEING COMPANY - PLANT 2 FACILITY 7811-04 CERADYNE INC., A 3M COMPANY - SEATTLE 7507-05 INDUSTRIAL CONTAINER SERVICES - WA LLC 7130-05 KERRY INC. 7854-02 LAFARGE - SEATTLE PLANT 7925-01 LINEAGE SEAFREEZE 7896-01 MAGNETIC AND PENETRANT SERVICES CO. 7873-02 MARINE VACUUM SERVICE INC. 7676-06 NATIONAL PRODUCTS INC. 7834-02 RAINIER COMMONS LLC - OLD RAINIER BREWERY SITE 7927-01 SEATTLE BARREL CO. 7113-04 SEATTLE, CITY OF - SPU - SOUTH TRANSFER STATION 7878-01 TLP MANAGEMENT SERVICES LLC 7592-05 VIGOR SHIPYARDS INC. 7782-07 WASTE MANAGEMENT NATIONAL SERVICES - 8TH AVENUE SOUTH RELOAD FACILITY 7928-01
Appendix A: LDW Source Control Annual Report Page 1 of 1 King County December 2018
Appendix B: WTD Source Tracing Combined Sewer Solids Dataset
LDW Source Control Annual Report King County December 2018
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Table B-1. King County LDW CSO Source Tracing Sample Locators and Associated Coordinates and Sample Types for 2016/2017
Samples Locator Description Xplan Yplan Latitude Longitude Sample Type Collected 8th Ave WEWDUWAM W14-316 (near 7703 8th ST_8AVE-01 1272497 198097.89 47.533316 -122.322785 12/7/16, 6/23/17 Sed Trap Ave S where 8th turns to S. Portland St) 6/19/17, S070196_TR S. Michigan Street Regulator Station 1270402 202321 473241.21 1221953.77 Sed Trap 12/21/17
MH071-099; Corson Ave S and S. Eddy Street 6/19/17, ST_MH071-099 1272840 202712 47.545982 -122.32176 Sed Trap Intersection 12/21/17
Locators with 'ST_' added to beginning indicates sample is sediment trap rather than in-line grab sample. X/Y Coordinates are in NAD1983 WA State Plane North.
Appendix B: LDW Source Control Annual Report 1 of 1 King County December 2018 Table B-2a. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report
Project: 423589-340-4 Project: 423589-340-4 Locator: ST_8AVE-01 Locator: ST_8AVE-01 Descrip: 8TH AVE SOUTH INLI Descrip: 8TH AVE SOUTH INLI Sample: L68096-2 Sample: L68096-4 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 6/23/17 0:00 ColDate: 6/23/17 0:00 TotalSolid: 48.6 TotalSolid: 48.6 DRY Weight Basis DRY Weight Basis
Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units CV ASTM D422/D3977-97 500 Micron (equal to/more than)* 28.4 TA J 0.005 0.01 % CV ISO 13320:2009(E) Clay* 3.06 TA J 0.01 0.01 % Volume Fines* 27.15 TA J 0.01 0.01 % Volume p+1.00* 2.64 TA J 0.01 0.01 % Volume p+10.0(more than)* 0.51 TA J 0.01 0.01 % Volume p+10.0* 0.86 TA J 0.01 0.01 % Volume p+2.00* 10.09 TA J 0.01 0.01 % Volume p+3.00* 14.83 TA J 0.01 0.01 % Volume p+4.00* 16.89 TA J 0.01 0.01 % Volume p+5.00* 8.52 TA J 0.01 0.01 % Volume p+6.00* 7.39 TA J 0.01 0.01 % Volume p+7.00* 5.09 TA J 0.01 0.01 % Volume p+8.00* 3.09 TA J 0.01 0.01 % Volume p+9.00* 1.69 TA J 0.01 0.01 % Volume Sand<1000* 44.46 TA J 0.01 0.01 % Volume Silt* 24.09 TA J 0.01 0.01 % Volume CV SM2540-G Total Solids* 48.6 0.005 0.01 % 48.6 0.005 0.01 % CV SW846 9060 PSEP96 Total Organic Carbon 107000 TA 10600 10600 mg/Kg MT SW846 3050B*SW846 6010D Arsenic, Total, ICP 6.4 5.14 5.14 mg/Kg Cadmium, Total, ICP 0.872 0.514 0.514 mg/Kg Chromium, Total, ICP 61.1 0.514 0.514 mg/Kg Copper, Total, ICP 132 1.03 1.03 mg/Kg Lead, Total, ICP 70.8 5.14 5.14 mg/Kg Nickel, Total, ICP 36.4 1.03 1.03 mg/Kg Silver, Total, ICP 1.73 1.03 1.03 mg/Kg Vanadium, Total, ICP 38.3 1.03 1.03 mg/Kg Zinc, Total, ICP 576 0.514 0.514 mg/Kg MT SW846 7471B Mercury, Total, CVAA 0.329 J J 0.0395 0.0395 mg/Kg 0.274 J,H J 0.0395 0.0395 mg/Kg OR SW846 3550B*SW846 8082A Aroclor 1016 Appendix B: LDW Source Control Annual Report Page 1 of 6 King County December 2018 Table B-2a. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423589-340-4 Locator: ST_8AVE-01 Locator: ST_8AVE-01 Descrip: 8TH AVE SOUTH INLI Descrip: 8TH AVE SOUTH INLI Sample: L68096-2 Sample: L68096-4 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 6/23/17 0:00 ColDate: 6/23/17 0:00 TotalSolid: 48.6 TotalSolid: 48.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Aroclor 1248 Appendix B: LDW Source Control Annual Report Page 2 of 6 King County December 2018 Table B-2a. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423589-340-4 Locator: ST_8AVE-01 Locator: ST_8AVE-01 Descrip: 8TH AVE SOUTH INLI Descrip: 8TH AVE SOUTH INLI Sample: L68096-2 Sample: L68096-4 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 6/23/17 0:00 ColDate: 6/23/17 0:00 TotalSolid: 48.6 TotalSolid: 48.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Pentachlorophenol * Not converted to dry weight basis MDL - method detection limit RDL - reporting detectin limit QL - quantitation limit J - estimated value U- not detected H - holding time TA- narrative info available Shaded value > source control screening benchmarks for combined sewer system. see Appendix F of King County 2016 Appendix B: LDW Source Control Annual Report Page 3 of 6 King County December 2018 Table B-2a. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423589-340-4 Locator: ST_8AVE-01 Locator: ST_8AVE-01 Descrip: 8TH AVE SOUTH INLI Descrip: 8TH AVE SOUTH INLI Sample: L68096-1 Sample: L68096-3 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 12/7/16 0:00 ColDate: 12/7/16 0:00 TotalSolid: 51.6 TotalSolid: 51.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units CV ASTM D422/D3977-97 500 Micron (equal to/more than)* CV ISO 13320:2009(E) Clay* Fines* p+1.00* p+10.0(more than)* p+10.0* p+2.00* p+3.00* p+4.00* p+5.00* p+6.00* p+7.00* p+8.00* p+9.00* Sand<1000* Silt* CV SM2540-G Total Solids* 51.6 H J 0.005 0.01 % 51.6 H J 0.005 0.01 % CV SW846 9060 PSEP96 Total Organic Carbon 116000 H,TA J 17000 17000 mg/Kg MT SW846 3050B*SW846 6010D Arsenic, Total, ICP 6.05 4.81 4.81 mg/Kg Cadmium, Total, ICP 0.872 0.481 0.481 mg/Kg Chromium, Total, ICP 84.9 0.481 0.481 mg/Kg Copper, Total, ICP 148 0.959 0.959 mg/Kg Lead, Total, ICP 101 4.81 4.81 mg/Kg Nickel, Total, ICP 43.4 0.959 0.959 mg/Kg Silver, Total, ICP 1 0.959 0.959 mg/Kg Vanadium, Total, ICP 32.2 0.959 0.959 mg/Kg Zinc, Total, ICP 682 0.481 0.481 mg/Kg MT SW846 7471B Mercury, Total, CVAA 5.21 H,J J 0.0773 0.0773 mg/Kg 0.378 H,J J 0.0397 0.0397 mg/Kg OR SW846 3550B*SW846 8082A Aroclor 1016 Appendix B: LDW Source Control Annual Report Page 4 of 6 King County December 2018 Table B-2a. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423589-340-4 Locator: ST_8AVE-01 Locator: ST_8AVE-01 Descrip: 8TH AVE SOUTH INLI Descrip: 8TH AVE SOUTH INLI Sample: L68096-1 Sample: L68096-3 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 12/7/16 0:00 ColDate: 12/7/16 0:00 TotalSolid: 51.6 TotalSolid: 51.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Aroclor 1248 Appendix B: LDW Source Control Annual Report Page 5 of 6 King County December 2018 Table B-2a. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423589-340-4 Locator: ST_8AVE-01 Locator: ST_8AVE-01 Descrip: 8TH AVE SOUTH INLI Descrip: 8TH AVE SOUTH INLI Sample: L68096-1 Sample: L68096-3 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 12/7/16 0:00 ColDate: 12/7/16 0:00 TotalSolid: 51.6 TotalSolid: 51.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Pentachlorophenol * Not converted to dry weight basis MDL - method detection limit RDL - reporting detectin limit QL - quantitation limit J - estimated value U- not detected H - holding time TA- narrative info available Shaded value > source control screening benchmarks for combined sewer system. see Appendix F of King County 2016 Appendix B: LDW Source Control Annual Report Page 6 of 6 King County December 2018 Table B-2b. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423660-200 Project: 423660-200 Locator: S070196_TR_U Locator: ST_MH071-099 Descrip: SOUTH MICHIGAN CSO Descrip: CORSON AND EDDY - Sample: L68066-1 Sample: L68066-3 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 6/19/17 0:00 ColDate: 6/19/17 0:00 TotalSolid: 56.1 TotalSolid: 53.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual MDL RDL Units Value Qual MDL RDL Units CV ASTM D422 Clay* 3.9 TA 1 1.9 % 5.5 TA 0.9 1.8 % Fines* 7.8 TA 1 1.9 % 12.9 TA 0.9 1.8 % Gravel* 20.5 TA 0.2 1.9 % 5.4 TA 0.2 1.8 % p+0.00* 11 TA 0.2 1.9 % 5.7 TA 0.2 1.8 % p+1.00* 8.1 TA 0.2 1.9 % 7.2 TA 0.2 1.8 % p+10.0(equal/more than)* 3.9 TA 1 1.9 % 3.7 TA 0.9 1.8 % p+2.00* 27.6 TA 0.2 1.9 % 40 TA 0.2 1.8 % p+3.00* 15.2 TA 0.2 1.9 % 22.3 TA 0.2 1.8 % p+4.00* 5.6 TA 0.2 1.9 % 6.6 TA 0.2 1.8 % p+5.00* 2.9 TA 1 1.9 % 6.4 TA 0.9 1.8 % p+6.00* 1 Appendix B: LDW Source Control Annual Report Page 1 of 3 King County December 2018 Table B-2b. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423660-200 Project: 423660-200 Locator: S070196_TR_U Locator: ST_MH071-099 Descrip: SOUTH MICHIGAN CSO Descrip: CORSON AND EDDY - Sample: L68066-1 Sample: L68066-3 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 6/19/17 0:00 ColDate: 6/19/17 0:00 TotalSolid: 56.1 TotalSolid: 53.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual MDL RDL Units Value Qual MDL RDL Units Aroclor 1254 116 8.91 8.91 ug/Kg 40.3 9.33 9.33 ug/Kg Aroclor 1260 95.5 8.91 8.91 ug/Kg 28 9.33 9.33 ug/Kg Total Aroclors 304 8.91 8.91 ug/Kg 68.3 9.33 9.33 ug/Kg OR SW846 3550B*SW846 8270D 1,2,4-Trichlorobenzene Appendix B: LDW Source Control Annual Report Page 2 of 3 King County December 2018 Table B-2b. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423660-200 Project: 423660-200 Locator: S070196_TR_U Locator: ST_MH071-099 Descrip: SOUTH MICHIGAN CSO Descrip: CORSON AND EDDY - Sample: L68066-1 Sample: L68066-3 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 6/19/17 0:00 ColDate: 6/19/17 0:00 TotalSolid: 56.1 TotalSolid: 53.6 DRY Weight Basis DRY Weight Basis Parameters Value Qual MDL RDL Units Value Qual MDL RDL Units Total HPAHS (calc) 3228 ug/Kg 3482 ug/Kg Total LPAHs (calc) 1207 ug/Kg 1328 ug/Kg OR WDOE NWTPH-DX Diesel Range (>C12-C24) 1940 SH,J 223 223 mg/Kg 951 SH,J 233 233 mg/Kg Lube Oil Range (>C24) 3160 SH 223 223 mg/Kg 2310 SH 233 233 mg/Kg * Not converted to dry weight basis NOTE: samples collected for another King County project so target analyte list differs from source tracing analytical list. MDL - method detection limit RDL - reporting detectin limit QL - quantitation limit J - estimated value U- not detected H - holding time TA- narrative info available SH - sampling handling Shaded value > source control screening benchmark for CSO system see Appendix F of King County 2016 Appendix B: LDW Source Control Annual Report Page 3 of 3 King County December 2018 Table B-2c. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423660-200 Locator: S070196_TR_L Locator: ST_MH071-099 Descrip: SOUTH MICHIGAN CSO Descrip: CORSON AND EDDY - Sample: L69255-1 Sample: L69256-1 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 12/21/17 0:00 ColDate: 12/21/17 0:00 TotalSolid: 46.2 TotalSolid: 48.4 DRY Weight Basis DRY Weight Basis Parameters Value Qual MDL RDL Units Value Qual MDL RDL Units CV ASTM D422 Clay* 6 1.2 2.4 % 7.3 1 2.1 % Fines* 30.2 1.2 2.4 % 13.6 1 2.1 % Gravel* 4.5 0.2 2.4 % 6.3 0.2 2.1 % p+0.00* 11.3 0.2 2.4 % 9.1 0.2 2.1 % p+1.00* 8.2 0.2 2.4 % 7.2 0.2 2.1 % p+10.0(equal/more than)* 4.8 1.2 2.4 % 7.3 1 2.1 % p+2.00* 11.2 0.2 2.4 % 22.6 0.2 2.1 % p+3.00* 18 0.2 2.4 % 29.4 0.2 2.1 % p+4.00* 10.3 0.2 2.4 % 10.9 0.2 2.1 % p+5.00* 20.5 1.2 2.4 % 4.2 1 2.1 % p+6.00* 1.2 Appendix B: LDW Source Control Annual Report Page 1 of 3 King County December 2018 Table B-2c. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423660-200 Locator: S070196_TR_L Locator: ST_MH071-099 Descrip: SOUTH MICHIGAN CSO Descrip: CORSON AND EDDY - Sample: L69255-1 Sample: L69256-1 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 12/21/17 0:00 ColDate: 12/21/17 0:00 TotalSolid: 46.2 TotalSolid: 48.4 DRY Weight Basis DRY Weight Basis Parameters Value Qual MDL RDL Units Value Qual MDL RDL Units Benzoic Acid 9260 2200 5410 ug/Kg 8510 2100 5170 ug/Kg Benzyl Alcohol Appendix B: LDW Source Control Annual Report Page 2 of 3 King County December 2018 Table B-2c. Combined Sewer System Solids Sampling Results for 2017. King County Environmental Lab Analytical Report Project: 423589-340-4 Project: 423660-200 Locator: S070196_TR_L Locator: ST_MH071-099 Descrip: SOUTH MICHIGAN CSO Descrip: CORSON AND EDDY - Sample: L69255-1 Sample: L69256-1 Matrix: SH IN-LINESED Matrix: SH IN-LINESED ColDate: 12/21/17 0:00 ColDate: 12/21/17 0:00 TotalSolid: 46.2 TotalSolid: 48.4 DRY Weight Basis DRY Weight Basis Parameters Value Qual MDL RDL Units Value Qual MDL RDL Units Indeno(1,2,3-Cd)Pyrene 80 NOTE: samples collected for another King County project so target analyte list differs from source tracing analytical list. MDL - method detection limit RDL - reporting detectin limit QL - quantitation limit J - estimated value U- not detected H - holding time TA- narrative info available SH - sampling handling Shaded value > source control screening benchmark for CSO system see Appendix F of King County 2016 Appendix B: LDW Source Control Annual Report Page 3 of 3 King County December 2018 This page intentionally left blank Appendix C: SWS Source Tracing Storm Drain Solids Dataset LDW Source Control Annual Report King County December 2018 This page intentionally left blank Table C-1. King County LDW Separated Stormdrain Source Tracing Sample Locators and Associated Coordinates and Sample Types Locator Sample Type FeatureType X Y Description Traps in 8-ft-deep, type 2 catch basin with slotted lid, just east of the lawn of 96-ST1 Sediment Trap Sump 1275076 192295.6 the Delta Marine admin building and just north of S 96th St. Traps in 14-foot-deep, type 2 CB with vaned, slotted lid near NE corner of 96-ST2 Sediment Trap Sump 1274675 192705 15th S. and S. 95th. Down-pipe drain system from 96-ST3. Traps on south wall of 13-ft deep stormwater vault at corner of 4th Ave S and 96-ST3 Sediment Trap Pond/Vault 1270741 192246.7 S 96th St. Up-pipe drain system from 96-ST2. X/Y Coordinates are in NAD1983 WA State Plane North. Appendix C: LDW Source Control Annual Report 1 of 1 King County December 2018 Table C-2. SWS Stormdrain solids sampling results 2017. King County Environmental Lab Analytical Report Project: 421195-590 Project: 421195-590 Project: 421195-590 Locator: 96-ST1 Locator: 96-ST2 Locator: 96-ST3 Descrip: SUMP 2219. THIS IS Descrip: SUMP 2228. THIS IS Descrip: POND/VAULT 144. TH Sample: L67374-1 Sample: L67374-2 Sample: L67374-3 Matrix: SE FRSHWTRSED Matrix: SE FRSHWTRSED Matrix: SE FRSHWTRSED ColDate: 5/4/17 ColDate: 5/4/17 ColDate: 5/4/17 TotalSolid: 64 TotalSolid: 75 TotalSolid: 44.8 DRY Weight Basis DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units CV ASTM D422 Clay* 4.7 0.8 1.6 % 2.6 0.7 1.3 % Fines* 18.8 0.8 1.6 % 6.6 0.7 1.3 % Gravel* 2.8 0.2 1.6 % 6.6 0.1 1.3 % p+0.00* 8.1 0.2 1.6 % 6.8 0.1 1.3 % p+1.00* 38.4 0.2 1.6 % 15.7 0.1 1.3 % p+10.0(equal/more than)* 3.1 0.8 1.6 % 2.6 0.7 1.3 % p+2.00* 25.7 0.2 1.6 % 44.3 0.1 1.3 % p+3.00* 3.1 0.2 1.6 % 18.2 0.1 1.3 % p+4.00* 2.5 0.2 1.6 % 2.3 0.1 1.3 % p+5.00* 7 0.8 1.6 % 2 0.7 1.3 % p+6.00* 1.6 RDL J 0.8 1.6 % 0.7 Appendix C: LDW Source Control Annual Report Page 1 of 3 King County December 2018 Table C-2. SWS Stormdrain solids sampling results 2017. King County Environmental Lab Analytical Report Project: 421195-590 Project: 421195-590 Project: 421195-590 Locator: 96-ST1 Locator: 96-ST2 Locator: 96-ST3 Descrip: SUMP 2219. THIS IS Descrip: SUMP 2228. THIS IS Descrip: POND/VAULT 144. TH Sample: L67374-1 Sample: L67374-2 Sample: L67374-3 Matrix: SE FRSHWTRSED Matrix: SE FRSHWTRSED Matrix: SE FRSHWTRSED ColDate: 5/4/17 ColDate: 5/4/17 ColDate: 5/4/17 TotalSolid: 64 TotalSolid: 75 TotalSolid: 44.8 DRY Weight Basis DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units MT SW846 3050B*SW846 6010D Arsenic, Total, ICP 20.5 3.91 3.91 mg/Kg 5.31 3.32 3.32 mg/Kg 14.5 5.58 5.58 mg/Kg Cadmium, Total, ICP Appendix C: LDW Source Control Annual Report Page 2 of 3 King County December 2018 Table C-2. SWS Stormdrain solids sampling results 2017. King County Environmental Lab Analytical Report Project: 421195-590 Project: 421195-590 Project: 421195-590 Locator: 96-ST1 Locator: 96-ST2 Locator: 96-ST3 Descrip: SUMP 2219. THIS IS Descrip: SUMP 2228. THIS IS Descrip: POND/VAULT 144. TH Sample: L67374-1 Sample: L67374-2 Sample: L67374-3 Matrix: SE FRSHWTRSED Matrix: SE FRSHWTRSED Matrix: SE FRSHWTRSED ColDate: 5/4/17 ColDate: 5/4/17 ColDate: 5/4/17 TotalSolid: 64 TotalSolid: 75 TotalSolid: 44.8 DRY Weight Basis DRY Weight Basis DRY Weight Basis Parameters Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Value Qual Val Qual MDL RDL Units Hexachlorobutadiene SQS/LAET and CSL/2LAET are source tracing benchmarks (See Appendix F of Kiing County 2016) Appendix C: LDW Source Control Annual Report Page 3 of 3 King County December 2018 Appendix D: KCIA Maps LDW Source Control Annual Report King County December 2018 This page intentionally left blank Appendix D, Figure 1. KCIA Stormwater Drainage Basins CENTERLINE WATERWAYDUWAMISH RIVER CHANNEL S14°00'00"E 598.52' S14°00'00"E 300.60' SDMH SDMH 12.00' SDMH N89°03'34"W 566.52' N88°51'56"W 1409.57' 12.00' CITY OF TUKWILA CITY OF SEATTLE SDMH SDMH S88°51'08"E 1506.71' DETAIL N.T.S. 1.00' N00°46'44"E SDMH LOT B LOT A N89°13'16"W 789.00' BLA NO. L2000-080 BLA NO. L2000-080 REC NO. 2001 11 08 900013 REC NO. 20011108900013 SDMH SDMH N22°32'07"W 631.21' SDMH 9.57" N22°32'07"W 341.91' 12" 6" 66" CMP OWNED BY WADOT 6" 6" 6" 2072 SF CONC SLAB PERIMETER 205 LF 6" 8238 SF ASPHALT 12" 1119 SF 4543 SF 6" 6" 12" S W A L E S W A L E S W A L E BLOCKAGE 12" IN LOWER UNKNOWN PIPE IF PIPE CONTINUES. NO EVIDENCE OF PIPE TO SDMH-1087 CITY OF TUKWILA CITY OF SEATTLE 247.3' 15" Ø 222 LF RCP1 15" RCP 15" RCP 18" RCP 16" D.I. S<0.0025 DUCTILE IRON 66" CMP OWNED BY WADOT 114 LF 48" DETENTION PIPE 54 LF 48" DETENTION PIPE 200 LF 48" DETENTION PIPE CITY OF TUKWILA CITY OF SEATTLE 8" DIP 8" DIP 8" DIP 6" SCH 80 PVC CB PROJECT NORTH TRUE NORTH FULL SIZE 1:1 72x36 Appendix D: LDW Source Control Annual Report 1 of 1 King County December 2018 This page intentionally left blank Appendix E: KCIA Source Tracing Storm Drain Solids Dataset LDW Source Control Annual Report King County December 2018 This page intentionally left blank Table E-1. Slip 4 Drainage Basin Stormdrain Solids Sample Results for 2017. Location SL4-T5B Grab SL4-T4A Trap SL4-T3A Trap SL4-T3A Grab SL4-T2A Trap SL4-T2A Grab Sampled By Boeing Boeing KCIA KCIA KCIA KCIA SQS CSL LAET 2LAET Date 4/28/2017 4/28/2017 5/31/2017 5/31/2017 5/31/2017 5/31/2017 Description North Lateral N. Central Lateral S. Central Lateral S. Central Lateral South Lateral South Lateral Results Qual Results Qual Results Qual Results Qual Results Qual Results Qual METALS (mg/kg dw) Arsenic (total) 57 93 31.8 25.6 J NA 2.17 NA 35.2 Copper 390 390 149 503 NA 13 NA 71.5 Lead 450 530 136 460 NA 5.51 NA 218 Mercury 0.41 0.59 0.280 0.366 NA 0.521 NA 0.484 U Zinc 410 960 525 1,590 NA 24 NA 737 PCB (ug/kg) pcb - Aroclor 1016 ------19.5 U 18.5 U 107 U 17.6 U 60.5 U 18.9 U pcb - Aroclor 1221 ------19.5 U 18.5 U 107 U 17.6 U 60.5 U 18.9 U pcb - Aroclor 1232 ------19.5 U 18.5 U 107 U 17.6 U 60.5 U 18.9 U pcb - Aroclor 1242 ------19.5 U 18.5 U 107 U 17.6 U 60.5 U 18.9 U pcb - Aroclor 1248 ------48.8 U 27.7 U 107 U 17.6 U 60.5 U 18.9 U pcb - Aroclor 1254 ------312 70.9 107 U 17.6 U 60.5 U 18.9 U pcb - Aroclor 1260 ------147 112 107 U 17.6 U 60.5 U 18.9 U Total PCB 130 1,000 459 182.9 107 U 17.6 U 60.5 U 18.9 U LPAH (ug/kg) acenaphthene 500 500 294 U 551 U 64 3.91 U NA 298 acenaphthylene 1,300 1,300 294 U 551 U 64 3.91 U NA 61.2 anthracene 960 960 106 J 318 J 25.6 U 3.91 U NA 398 fluorene 540 540 294 U 551 U 89.6 3.91 U NA 304 methylnaphthalene, 2- 670 670 294 U 551 U 25.6 U 3.91 U NA 299 naphthalene 2,100 2,100 294 U 551 U 512 U 78.2 U NA 103 U phenanthrene 1,500 1,500 1,060 2,390 1,880 56 NA 2,640 Total LPAH1 5,200 5,200 1,166 2,708 2,098 56 4,000 HPAH (ug/kg) benzo[a]anthracene 1,300 1,600 615 1,300 1,620 51 NA 1,540 benzo[a]pyrene 1,600 1,600 987 2,090 2,730 89 NA 2,470 Total Benzoflouranthenes 3,200 3,600 2,900 5,810 9,140 246 NA 13,070 benzo(g,h,i)perylene 670 720 1,290 2,230 3,530 104 NA 2,000 chrysene 1,400 2,800 1,800 3,510 3,040 86 NA 2,100 dibenz[a,h]anthracene 230 230 253 J 854 645 20 NA 393 fluoranthene 1,700 2,500 2,170 4,030 6,130 174 NA 4,780 indeno[1,2,3-cd]pyrene 600 690 938 1,790 3,270 94 NA 2,020 pyrene 2,600 3,300 2,310 3,190 4,440 133 NA 4,130 Total HPAH2 12,000 17,000 13,263 J 24,804 34,545 996 32,503 PHTHALATES (ug/kg) bis(2-ethylhexyl) phthalate 1,300 1,900 27,500 18,100 12,000 78 U NA 858 butyl benzyl phthalate 63 900 8,660 3,510 512 U 78 U NA 103 U diethyl phthalate 200 1,200 294 U 551 U 512 U 78 U NA 103 U dimethyl phthalate 71 160 294 U 551 U 512 U 78 U NA 103 U di-butyl phthalate (di-n-butyl phth.) 1,400 1,400 294 U 688 512 U 78 U NA 103 U Appendix E: LDW Source Control Annual Report 1 of 2 King County December 2018 Table E-1. Slip 4 Drainage Basin Stormdrain Solids Sample Results for 2017. Location SL4-T5B Grab SL4-T4A Trap SL4-T3A Trap SL4-T3A Grab SL4-T2A Trap SL4-T2A Grab Sampled By Boeing Boeing KCIA KCIA KCIA KCIA SQS CSL LAET 2LAET Date 4/28/2017 4/28/2017 5/31/2017 5/31/2017 5/31/2017 5/31/2017 Description North Lateral N. Central Lateral S. Central Lateral S. Central Lateral South Lateral South Lateral Results Qual Results Qual Results Qual Results Qual Results Qual Results Qual di-n-octyl phthalate 6,200 6,200 3,790 34,100 256 U 39 U NA 51 U TPH (mg/kg dw) Diesel (MTCA A) 2,000 2,000 871 J 339 J NA 62 NA 160 Heavy Oil (Motor Oil MTCA A) 2,000 2,000 2,740 J 1,710 J NA 360 NA 570 Conventionals (%) Solids, Total ------20.37 17.92 13 66.8 24.9 53.7 Total Organic Carbon ------8.28 6.11 2.3 0.26 18.0 1.9 <-1 Phi Gravel, >2000 micron ------NA NA NA 0.3 NA 4.1 -1-0 Phi Very Coarse Sand, 1000-2000 micron ------NA NA NA 0.6 NA 20.4 0-1 Phi Coarse Sand, 500-1000 micron ------NA NA NA 1.8 NA 17 1-2 Phi Medium Sand, 250-500 micron ------NA NA NA 15.9 NA 20.2 2-3 Phi Fine Sand, 125-250 micron ------NA NA NA 49.5 NA 24.5 3-4 Phi Very Fine Sand, 62.5-125 micron ------NA NA NA 23.7 NA 5.6 4-5 Phi Coarse Silt, 31-62.5 micron ------NA NA NA 3.7 NA 3 5-6 Phi Medium Silt, 15.6-31 micron ------NA NA NA 0.1 U NA 0.1 U 6-7 Phi Fine Silt, 7.8-15.6 micron ------NA NA NA 1.6 NA 0.8 7-8 Phi Very Fine Silt, 3.9-7.8 micron ------NA NA NA 1.3 NA 0.9 8-9 Phi Clay, 2-3.9 micron ------NA NA NA 0.4 NA 1.0 9-10 Phi Clay, 1-2 micron ------NA NA NA 0.1 U NA 0.6 >10 Phi Clay, <1 micron ------NA NA NA 0.1 U NA 0.5 Total Fines ------NA NA NA 0.7 NA 0.7 Indicates > than the SQS/LAET Indicates > than the CSL/2LAET NA = Not Analyzed U - Not detected J - Estimated value 1. Total LPAHs were calculated as the sum of detected 2-methylnaphthalene, acenaphthene, acenaphthylene, anthracene, fluorene, naphthalene, and phenanthrene 2. Total HPAHs were calculated as the sum of detected benzo(a)anthracene, benzo(a)pyrene, benzo(g,h,i)perylene, total benzofluoranthenes, chrysene, dibenzo(a,h)anthracene, fluoranthene, indeno(1,2,3-cd)pyrene, and pyrene SQS/LAET - Sediment Quality Standards/Lowest Apparent Effects Threshold CSL/2LAET - Cleanup Screening Level/Second Lowest Apparent Effects Threshold SQS/LAET and CSL/2LAET are source tracing benchmarks (See Appendix F of Kiing County 2016) Appendix E: LDW Source Control Annual Report 2 of 2 King County December 2018 Table E-2. Former Slip 5 Drainage Basin Stormdrain Solids Sample Results for 2017 Location KCIA2 Trap KCIA2 Grab SPS Grab SQS CSL Sampled By LAET 2LAET KCIA KCIA KCIA Date 5/31/2017 5/31/2017 5/31/2017 Results Qual Results Qual Results Qual METALS (mg/kg) Arsenic (total) 57 93 NA 14.1 42.9 Copper 390 390 NA 38.1 112 Lead 450 530 NA 18.7 29.7 Mercury 0.41 0.59 NA 2.13 U 4.62 U Zinc 410 960 NA 409 352 PCB (ug/kg) pcb - Aroclor 1016 ------58.5 U 76.5 U 126 U J pcb - Aroclor 1221 ------58.5 U 76.5 U 126 U J pcb - Aroclor 1232 ------58.5 U 76.5 U 126 U J pcb - Aroclor 1242 ------58.5 U 76.5 U 126 U J pcb - Aroclor 1248 ------58.5 U 76.5 U 126 U J pcb - Aroclor 1254 ------58.5 U 76.5 U 126 U J pcb - Aroclor 1260 ------58.5 U 76.5 U 367 J Total PCB 130 1,000 58.5 U 76.5 U 367 J LPAH (ug/kg) acenaphthene 500 500 NA 23.3 U 27.5 U acenaphthylene 1,300 1,300 NA 23.3 U 27.5 U anthracene 960 960 NA 23.3 U 27.5 U fluorene 540 540 NA 23.3 U 27.5 U methylnaphthalene, 2- 670 670 NA 23.3 U 27.5 U naphthalene 2,100 2,100 NA 466 U 550 U phenanthrene 1,500 1,500 NA 41.9 66 Total LPAH1 5,200 5,200 NA 41.9 66 HPAH (ug/kg) benzo[a]anthracene 1,300 1,600 NA 44 55 benzo[a]pyrene 1,600 1,600 NA 23.3 U 294 total benzofluoranthenes 3,200 3,600 NA 559 630 benzo(g,h,i)perylene 670 720 NA 261 256 chrysene 1,400 2,800 NA 90.9 124 dibenz[a,h]anthracene 230 230 NA 23.3 U 38.5 fluoranthene 1,700 2,500 NA 165 228 indeno[1,2,3-cd]pyrene 600 690 NA 231 234 pyrene 2,600 3,300 NA 135 179 Total HPAH2 12,000 17,000 NA 1,486 2,039 PHTHALATES (ug/kg) bis(2-ethylhexyl) phthalate 1,300 1,900 NA 466 U 550 U butyl benzyl phthalate 63 900 NA 466 U 550 U diethyl phthalate 200 1,200 NA 466 U 550 U Appendix E: LDW Source Control Annual Report 1 of 2 King County December 2017 Table E-2. Former Slip 5 Drainage Basin Stormdrain Solids Sample Results for 2017 Location KCIA2 Trap KCIA2 Grab SPS Grab SQS CSL Sampled By LAET 2LAET KCIA KCIA KCIA Date 5/31/2017 5/31/2017 5/31/2017 Results Qual Results Qual Results Qual dimethyl phthalate 71 160 NA 466 U 550 U di-butyl phthalate (di-n-butyl phth.) 1,400 1,400 NA 466 U 550 U di-n-octyl phthalate 6,200 6,200 NA 233 U 275 U TPH (mg/kg) Diesel (MTCA A) 2,000 2,000 NA 25 U 100 Heavy Oil (Motor Oil MTCA A) 2,000 2,000 NA 50 U 570 Conventionals (%) Solids, Total 24.1 11.6 9.81 Total Organic Carbon 0.18 0.54 0.41 <-1 Phi Gravel, >2000 micron NA 24.7 4.10 -1-0 Phi Very Coarse Sand, 1000-2000 micron NA 18.70 10.20 0-1 Phi Coarse Sand, 500-1000 micron NA 13.9 9.2 1-2 Phi Medium Sand, 250-500 micron NA 12.0 7.2 2-3 Phi Fine Sand, 125-250 micron NA 5.40 2.00 3-4 Phi Very Fine Sand, 62.5-125 micron NA 6.00 9.20 4-5 Phi Coarse Silt, 31-62.5 micron NA 2.00 30.10 5-6 Phi Medium Silt, 15.6-31 micron NA 2.2 7.50 6-7 Phi Fine Silt, 7.8-15.6 micron NA 4.40 7.40 7-8 Phi Very Fine Silt, 3.9-7.8 micron NA 4.00 6.80 8-9 Phi Clay, 2-3.9 micron NA 0.7 1.10 9-10 Phi Clay, 1-2 micron NA 0.1 U 0.10 >10 Phi Clay, <1 micron NA 6.70 6.20 Total Fines NA NA NA Indicates > than the SQS/LAET Indicates > than the CSL/2LAET NA = Not Analyzed U - Not detected J - Estimated value 1. Total LPAHs were calculated as the sum of detected 2-methylnaphthalene, acenaphthene, acenaphthylene, anthracene, fluorene, naphthalene, and phenanthrene 2. Total HPAHs were calculated as the sum of detected benzo(a)anthracene, benzo(a)pyrene, benzo(g,h,i)perylene, total benzofluoranthenes, chrysene, dibenzo(a,h)anthracene, fluoranthene, indeno(1,2,3-cd)pyrene, and pyrene SQS/LAET - Sediment Quality Standards/Lowest Apparent Effects Threshold CSL/2LAET - Cleanup Screening Level/Second Lowest Apparent Effects Threshold SQS/LAET and CSL/2LAET are source tracing benchmarks (See Appendix F of Kiing County 2016) Appendix E: LDW Source Control Annual Report 2 of 2 King County December 2017 Table E-3. Slip 6 Drainage Basin Stormdrain Solids Sample Results for 2017 Location KCIA1A Trap KCIA1A Grab SQS CSL LAET 2LAET Sampled By KCIA KCIA Date 5/31/2017 5/31/2017 Results Qual Results Qual METALS (mg/kg) Arsenic (total) 57 93 NA 14.1 Copper 390 390 NA 38.1 Lead 450 530 NA 18.7 Mercury 0.41 0.59 NA 2.13 U Zinc 410 960 NA 409 PCB (ug/kg) pcb - Aroclor 1016 ------585 U 76.5 U pcb - Aroclor 1221 ------585 U 76.5 U pcb - Aroclor 1232 ------585 U 76.5 U pcb - Aroclor 1242 ------585 U 76.5 U pcb - Aroclor 1248 ------585 U 76.5 U pcb - Aroclor 1254 ------585 U 76.5 U pcb - Aroclor 1260 ------585 U 76.5 U Total PCB 130 1,000 585 U 76.5 U LPAH (ug/kg) acenaphthene 500 500 NA 19.8 U acenaphthylene 1,300 1,300 NA 19.8 U anthracene 960 960 NA 19.8 U fluorene 540 540 NA 19.8 U methylnaphthalene, 2- 670 670 NA 19.8 U naphthalene 2,100 2,100 NA 396 U phenanthrene 1,500 1,500 NA 19.8 U Total LPAH1 5,200 5,200 NA 396 U HPAH (ug/kg) benzo[a]anthracene 1,300 1,600 NA 19.8 U benzo[a]pyrene 1,600 1,600 NA 19.8 U Total Benzofluoranthenes 3,200 3,600 NA 19.8 U benzo(g,h,i)perylene 670 720 NA 20.8 U chrysene 1,400 2,800 NA 19.8 U dibenz[a,h]anthracene 230 230 NA 19.8 U fluoranthene 1,700 2,500 NA 19.8 U indeno[1,2,3-cd]pyrene 600 690 NA 19.8 U pyrene 2,600 3,300 NA 19.8 U Total HPAH2 12,000 17,000 NA 20.8 U PHTHALATES (ug/kg) bis(2-ethylhexyl) phthalate 1,300 1,900 NA 396 U butyl benzyl phthalate 63 900 NA 396 U diethyl phthalate 200 1,200 NA 396 U dimethyl phthalate 71 160 NA 396 U di-butyl phthalate (di-n-butyl phth.) 1,400 1,400 NA 396 U di-n-octyl phthalate 6,200 6,200 NA 198 U Appendix E: LDW Source Control Annual Report 1 of 2 King County December 2017 Table E-3. Slip 6 Drainage Basin Stormdrain Solids Sample Results for 2017 Location KCIA1A Trap KCIA1A Grab SQS CSL LAET 2LAET Sampled By KCIA KCIA Date 5/31/2017 5/31/2017 Results Qual Results Qual TPH (mg/kg) Diesel (MTCA A) 2,000 2,000 NA 25 U Heavy Oil (Motor Oil MTCA A) 2,000 2,000 NA 50 U Conventionals (%) Solids, Total 2.3 14.1 Total Organic Carbon 0.94 7.4 <-1 Phi Gravel, >2000 micron NA 10.7 -1-0 Phi Very Coarse Sand, 1000-2000 micron NA 15.6 0-1 Phi Coarse Sand, 500-1000 micron NA 14.9 1-2 Phi Medium Sand, 250-500 micron NA 12.1 2-3 Phi Fine Sand, 125-250 micron NA 8.5 3-4 Phi Very Fine Sand, 62.5-125 micron NA 7.1 4-5 Phi Coarse Silt, 31-62.5 micron NA 6.1 5-6 Phi Medium Silt, 15.6-31 micron NA 4.8 6-7 Phi Fine Silt, 7.8-15.6 micron NA 1.8 7-8 Phi Very Fine Silt, 3.9-7.8 micron NA 6.8 8-9 Phi Clay, 2-3.9 micron NA 3.1 9-10 Phi Clay, 1-2 micron NA 1.8 >10 Phi Clay, <1 micron NA 6.5 Total Fines NA NA Indicates > than the SQS/LAET Indicates > than the CSL/2LAET NA = Not Analyzed U - Not detected 1. Total LPAHs were calculated as the sum of detected 2-methylnaphthalene, acenaphthene, acenaphthylene, anthracene, fluorene, naphthalene, and phenanthrene 2. Total HPAHs were calculated as the sum of detected benzo(a)anthracene, benzo(a)pyrene, benzo(g,h,i)perylene, total benzofluoranthenes, chrysene, dibenzo(a,h)anthracene, fluoranthene, indeno(1,2,3-cd)pyrene, and pyrene SQS/LAET - Sediment Quality Standards/Lowest Apparent Effects Threshold CSL/2LAET - Cleanup Screening Level/Second Lowest Apparent Effects Threshold SQS/LAET and CSL/2LAET are source tracing benchmarks (See Appendix F of Kiing County 2016) Appendix E: LDW Source Control Annual Report 2 of 2 King County December 2017