Sediment Characterization Report Terminal 2, Berths 205 and 206 NW Front Avenue Portland, Oregon
Total Page：16
File Type：pdf, Size：1020Kb
Sediment Characterization Report Terminal 2, Berths 205 and 206 NW Front Avenue Portland, Oregon Prepared for Port of Portland April 10, 2012 15665-01 Sediment Characterization Report Terminal 2, Berths 205 and 206 NW Front Avenue Portland, Oregon Prepared for Port of Portland April 10, 2012 15665-01 Prepared by Hart Crowser, Inc. Expires: 5/31/12 Richard D. Ernst, RG Principal 8910 SW Gemini Drive Beaverton, Oregon 97008-7123 Fax 503.620.6918 Tel 503.620.7284 CONTENTS Page ACRONYMS iii 1.0 INTRODUCTION 1 1.1 Terminal 2 and Berth Descriptions 1 1.2 Previous Sediment Characterization Activities 2 1.3 Project Description 2 2.0 SEDIMENT CHARACTERIZATION OBJECTIVES 3 3.0 SAMPLING AND ANALYSIS ACTIVITIES 4 3.1 Sediment Core Sampling 4 3.2 Reference Sediment Sampling 5 3.3 Analytical Program 6 3.4 Modifications to the SAP 7 4.0 SEDIMENT QUALITY 8 4.1 Data Quality Review 8 4.2 Grain Size Characteristics 9 4.3 Comparison to SEF Screening Levels 9 4.4 Data Evaluation 10 5.0 SUMMARY 10 6.0 REFERENCES 10 TABLES 1 Core and Sample Information 2 Grain Size Distributions 3 Sediment Chemical Analyses Results FIGURES 1 Site Location Map 2 Site Plan and Core Sampling Locations Hart Crowser Page i 15665-01 April 10, 2012 CONTENTS (Continued) APPENDIX A SEDIMENT CORE LOGS APPENDIX B QUALITY ASSURANCE REVIEW APPENDIX C ANALYTICAL LABORATORY REPORTS Hart Crowser Page ii 15665-01 April 10, 2012 ACRONYMS ARI Analytical Resources, Inc. CCV Continuing Calibration Verifications COC chemical of concern Corps U.S. Army Corps of Engineers CRD Columbia River Datum cy cubic yard DEHP bis(2-ethylhexyl)phthalate DEQ Oregon Department of Environmental Quality DMEF Dredged Material Evaluation Framework DMMU Dredge material management unit EPA Environmental Protection Agency GPS global positioning system IS Internal Standard LCS laboratory control sample LCSD laboratory control sample duplicate MDL method detection limit µg/kg micrograms per kilogram MRL method reporting limit MS matrix spike MSD matrix spike duplicate NSM new surface material NUC Northwest Underwater Construction PAHs polycyclic aromatic hydrocarbons PCBs polychlorinated biphenyls Port Port of Portland PSET Portland Sediment Evaluation Team QA/QC quality assurance/quality control RPD relative percent difference RSD Relative Standard Deviation SAP Sampling and Analysis Plan SEF Sediment Evaluation Framework for the Pacific Northwest SL screening level SRM Standard Reference Material SVOC semivolatile organic compound TBT tributyltin TOC total organic carbon Total DDx DDT, DDE, and DDD TPH total petroleum hydrocarbons Hart Crowser Page iii 15665-01 April 10, 2012 SEDIMENT CHARACTERIZATION REPORT TERMINAL 2, BERTHS 205 AND 206 NW FRONT AVENUE, PORTLAND, OREGON 1.0 INTRODUCTION The Port of Portland (Port) proposes to conduct a maintenance dredging event at Berths 205 and 206 at Terminal 2 along the Willamette River in Portland, Oregon (Figure 1). To provide chemical quality data on sediment to be dredged and the future “leave surface” or new surface material (NSM), sediment characterization activities were completed in accordance with the Sediment Evaluation Framework (SEF) for the Pacific Northwest (U.S. Army Corps of Engineers [Corps] et al., 2009) and our Sampling and Analysis Plan (SAP) (Hart Crowser, 2011) as modified by comments from the Portland Sediment Evaluation Team (PSET, 2012). This report presents the results and findings of these activities. 1.1 Terminal 2 and Berth Descriptions Terminal 2 is located at 3556 NW Front Avenue in Portland, Oregon, on the west bank of the Willamette River at river mile 10 (Figure 1). The Willamette River at this location is heavily developed and supports a variety of industrial activities. Terminal 2 has four berths (Berths 203, 204, 205, and 206) and is used as a breakbulk and container general cargo facility (Figure 2). This facility handles many types of cargo, including lumber and forest products, steel, machinery, and packaged goods. The project site is Berths 205 and 206. Figure 2 shows Berths 205 and 206, along with July 2011 bathymetric survey conducted by the Port. Sediment contours are relative to the Columbia River Datum (CRD). These berths are contiguous and comprise an area of 1,550 feet long by 125 feet wide. A description of these berths is as follows. Berth 205. This berth is approximately 700 feet long. Based on the survey, the river bottom within the berthing area varies from approximately -27 to -37.5 feet CRD. The design depth of Berth 205 is -40 feet CRD but in this project the Port intends to dredge Berth 205 only to a project design depth of -36 feet CRD. Berth 206. This berth is approximately 850 feet long. Based on the survey, the river bottom within the berthing area varies from approximately -31 to -41 feet CRD. The design depth of Berth 206 is -40 feet CRD but in this project the Port intends to dredge Berth 206 only to a project design depth of -38 feet CRD. Hart Crowser Page 1 15665-01 April 10, 2012 1.2 Previous Sediment Characterization Activities Previous sediment characterization and berth maintenance events for Berths 205 and 206 are discussed in the SAP (Hart Crowser, 2011). The Port has conducted maintenance dredging of Berths 205 and 206, along with Berth 204, six times from 1990 through 2008. The last dredging event in 2008 removed 12,242 cubic yards (cy) from Berths 205 and 206. Previous sampling data detected total DDx (DDT plus its breakdown products DDE and DDD) slightly above its Dredged Material Evaluation Framework (DMEF) screening level (SL) within the dredge prism in a 2001 study, but not in the NSM (the previous individual detections of DDT, DDE, and DDD are below their respective SEF SLs). This material was partially dredged in 2002, and sampling in 2004 and 2008 did not detect DDT, DDE, and DDD above SEF SLs. As such, total DDx or its breakdown products are no longer chemicals of concern (COCs) for the project site. Analytical results on grab samples in 2004 did not detect compounds above SEF SLs. The 2008 study detected benzoic acid and bis (2-ethylhexyl) phthalate (DEHP) above their respective SLs in NSM samples at Berth 205 and a NSM sample had a bioassay failure (likely due to ammonia). After dredging, benzoic acid and DEHP were below SEF SLs in the NSM. Because of these prior and recent detections, benzoic acid and DEHP were identified as COCs at this site. Based on these slight COC exceedances and the prior bioassay failure, a “moderate” rank was proposed for Berths 205 and 206 in accordance with Table 4-2 of the SEF. PSET (2012) concurred with this ranking. 1.3 Project Description Maintenance dredging is needed due to the gradual and persistent deposition of river sediment in the berthing areas that compromises the authorized navigational depth clearances required for ships. The Port conducts maintenance dredging under Corps permit NWP-2006-635 (expiration January 31, 2017) issued under Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act and Oregon DSL permit 34105-RF (expiration July 18, 2013). These permits allow dredging up to -40 feet CRD with two feet of overdredge. In-water dredging activities will be performed during the Willamette River in-water work window from July 1 to October 31, 2012. Project specifics for each berth are presented below, including the authorized dredging depths (per Corps permit NWP-2006-635), the approximate leave surface elevation for NSM considering overdredge for maintenance and inherent dredging accuracy, and the estimated Hart Crowser Page 2 15665-01 April 10, 2012 volume of sediment to be dredged. The Port considered two different design depths for each berth and thus sediment characterization included sampling both possible NSM depths. The Port has since decided to conduct maintenance dredging to the shallower NSM depth as indicated below. Figure 2 shows the approximate area where dredging will occur for Berths 205 and 206. Berth 205. This berth’s design depth for this project is -36 feet CRD. With an additional two feet of overdredge allowance, the NSM will likely average -37 feet CRD. The estimated volume of sediment in the dredge prism ranges from approximately 6,000 to 18,000 cy. A deeper design depth of -38 feet CRD was considered (NSM of -39 feet CRD), but will not be selected. Berth 206. This berth’s design depth for this project is -38 feet CRD. With an additional two feet of overdredge allowance, the NSM will likely average -39 feet CRD. The estimated volume of sediment in the dredge prism ranges from approximately 5,000 to 10,000 cy. A deeper design depth of -40 feet CRD was considered (NSM of -41 feet CRD), but will not be selected. The Port will use its standard berth dredging methods, which are designed and have been previously demonstrated to minimize water quality impacts. A clamshell dredge will remove sediments using a close-lipped bucket operated either from the dock or from a floating crane. The depth and position of the bucket and dredge would be monitored by visual and positioning computer systems, including a global positioning system (GPS). The dredge material will be placed in a barge for transport and placement at the West Hayden Island Upland Placement Site (pending approval of a Beneficial Use Determination from the Oregon Department of Environmental Quality [DEQ]). Placement of this dredged material at this upland placement site is not anticipated to generate return water to the Columbia River. 2.0 SEDIMENT CHARACTERIZATION OBJECTIVES The overall objective of this sediment characterization study was to characterize the quality of the proposed dredge material and NSM. Specific objectives of the study were to: Characterize sediment affected by proposed dredging activities along the berths (i.e., the dredge prism) to document the quality of the sediments; Additionally, characterize the underlying NSM (a.k.a.