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Department of Environmental Quality Memorandum State of Oregon Department of Environmental Quality Memorandum Date: February 28, 2017 To: FILE Through: Dan Hafley, Lead Worker Northwest Region Cleanup Section From: Paul Seidel, Project Manager Northwest Region Cleanup Section Subject: 3009 NE Killingsworth Street, Portland, Oregon ECSI 6052; Staff Memorandum in support of a No Further Action determination This document presents the basis for the Oregon Department of Environmental Quality’s (DEQ’s) recommended No Further Action (NFA) determination for the property at 3009 NE Killingsworth Street in Portland, Oregon, formerly known as Bighouse Automotive (see Attachment 1 for site location). As discussed in this memorandum, contaminant concentrations in soil are below acceptable risk levels, while other environmental media have not been impacted. The proposed NFA determination meets the requirements of Oregon Administrative Rules Chapter 340 Division 122, Sections 010 to 0140; and ORS 465.200 through 465.455. The proposal is based on information documented in the administrative record for this site. A copy of the administrative record index is presented at the end of this memorandum. 1. BACKGROUND Site location. The site’s location can be described as follows: Address: 3009 Northeast Killingsworth Street, Portland (Multnomah County), Oregon. Latitude 45.562804 North, longitude 122.6348220 West, Willamette Baseline and Meridian Tax lot 1N1E13CD-15000. Site setting. The property is an urban lot approximately 0.23 acres in size, and was previously used for an automotive fueling and service station, automotive repair and U-Haul storage facility. The site is reported to have been first developed in 1939 by the City of Portland. The property is currently planned for redevelopment and is located in a mixed use commercial and residential neighborhood that is undergoing re-development. The site is bounded on the south by NE Killingsworth Street, on the west by NE 30th Avenue and on the east and north by residential properties (Figure 1). 3009 NE Killingsworth Street, ECSI # 6052 Staff Memorandum February 28, 2017 Page 2 of 10 The land is zoned Storefront Commercial (CS) by the City of Portland. Physical setting. The site is a flat lot located in the Concordia neighborhood of North Portland. Shallow groundwater was not encountered in borings completed during a Phase II investigation in 2015, which extended to a maximum depth of 25 feet below ground surface (bgs). According to the site consultant, groundwater in this area occurs at depths exceeding 60 feet bgs. The area is within the ancestral Columbia River flood plain. The geology of this area is defined by catastrophic flood events that drained ancient glacial Lake Missoula repeatedly from 15,300 to 12,700 years ago. These repeated floods deposited gravels and fine sediments in the Portland area and formed the topography of the Alameda Ridge, sloping gently north to the Columbia Slough. Shallow groundwater flow directions were not determined for the site, but groundwater likely flows northerly toward the Columbia Slough and River. Site history. On a 1924 Sanborn map, the site depicted as a vacant lot and in a 1934 aerial photograph, the Site is a vacant lot. The earliest known development on the site occurred in 1939, as reported by the City of Portland. Commercial use as an automotive service facility started at that time and continued until recently, when the site was sold for redevelopment. Prior to demolition in 2016, an approximately 1,300-square-foot wood-frame building with a concrete slab on-grade was present in the central portion of the lot. A service island and canopy for vehicle fueling was present immediately south of the building. Two service bays were used, each containing a subsurface hydraulic hoist and a catch basin with a sump that discharged to the City of Portland sanitary sewer system. No staining or evidence of releases was observed around the lifts at the time of the phase I assessment. The site is listed in DEQ’s UST database. No decommissioning records are available and no UST releases have been reported to DEQ. No transactions or site closure is indicated in DEQ’s UST records. Site closure for all site activities is therefore recommended under this memorandum. During site reconnaissance conducted in 2015, the Site owner reported that he removed the three USTs in 1989, including one gasoline and one diesel UST from the paved area east of the building and one waste-oil UST immediately north of the service bays. The USTs reportedly were emptied, removed with a backhoe, and recycled off-site. Groundwater reportedly was not encountered during the UST removal activities, and no confirmation soil samples were collected prior to backfilling the UST excavations with clean sand fill. A Phase I site assessment was completed in May 2015 (Phase I Environmental Site Assessment, Report, Northeast Killingsworth Property, Portland, Oregon, prepared by Farrallon, LLC. May 27, 2015). The report identified two recognized environmental conditions (RECs). These were: a) potential releases associated with former uses in automotive service and repair, and; b) potential for releases from former dry cleaning in the site vicinity. A historic dry cleaner was reported to have operated at 5425 NE 30th Avenue, approximately 200 feet south of the site. No known releases are reported associated with this site, but it presence was identified as an REC. 3009 NE Killingsworth Street, ECSI # 6052 Staff Memorandum February 28, 2017 Page 3 of 10 In 2017, a mixed-use commercial/residential building will be constructed on-site, with residential space above the first floor. Site redeveloped occurred under a Soil Management Plan (SMP) and Health and Safety Plan (HASP) prepared independently of DEQ Contaminated soil (see discussion below) was segregated and disposed at the Hillsboro Landfill under the SMP (Soil Management Plan Implementation and Site Closure, Northeast Killingsworth Property, Portland, Oregon, prepared by Farrallon, LLC. February 16, 2017). 2. BENEFICIAL LAND AND WATER USE DETERMINATIONS Land use. Currently, the site is zoned Storefront Commercial (CS). According to the City, this zoning designation is intended to preserve and enhance older commercial areas that have a storefront character. The zone intends that new development in these areas will be compatible with this desired character. The Concordia neighborhood and site area is fully-developed, and will be undergoing redevelopment is a manner consistent with this zoning into the future. Groundwater use. There is no current use of groundwater at the site. Water is supplied to the site by the City. A review of Oregon Water Resources well logs did not identify any wells in the immediate site vicinity. However, groundwater may exceed depths of 50 feet based on experience of the site consultant. There is no indication that shallow groundwater has been impacted by site-related contaminants, based on the sampling results from the Phase II investigation. As discussed below, site impacts are negligible to minor and confined to near-surface soil. It is expected that there will be no use of groundwater at the site for the foreseeable future, based on the urban location. On this basis, the groundwater ingestion and inhalation pathway was not included in the risk evaluation. Surface water use. The nearest surface water body to the site is the Buffalo Slough, located approximately 0.9 miles to the north. The site topography is generally flat, and stormwater from the site is either captured in City catch basins or infiltrates into the ground around the site. Given that the site is currently being redeveloped and will be covered by a combination of hardscape and minimal landscaping, runoff or erosion of contaminants in soil does not appear to be a significant concern. To the extent that residual soil contamination is present, it will be covered by buildings or landscaping and not expected to migrate to nearby City catch basins. 3. INVESTIGATION AND CLEANUP WORK Based on the identified RECs in the Phase I assessment, Farrallon, LLC performed initial sampling and investigation of subsurface conditions to evaluate the potential presence of any hazardous substances associated with former site use as an automotive repair facility or migration of contaminants from off-site. A Phase II environmental site assessment was performed in May and June 2015 to assess potential contaminant impact to site media (Phase II Environmental Site Assessment Report, Northeast Killingsworth Property, Portland, Oregon, 3009 NE Killingsworth Street, ECSI # 6052 Staff Memorandum February 28, 2017 Page 4 of 10 prepared by Farrallon, LLC. June 9, 2015). Analytical Data from the Phase I investigation is presented in Tables 1-6. Sample locations are presented in Figure 2. The Phase II report documents the following work: 1) Completion of 15 investigative borings, advanced in locations based on the proximity to former site features including service bays, near hydraulic hoist and pumping equipment, and borings near the service island, product lines, former USTs and the sanitary sewer lines. 2) Collection of 31 soil samples at varying depths within the borings. PID readings were low to zero. Therefore shallow samples were selected for analysis, along with deeper samples from borings B-7, B-8 and B-9 in the former UST area. Nineteen total samples were analyzed for petroleum hydrocarbons by method TPH-HCID. 3) The same 19 soil samples were analyzed for petroleum hydrocarbon ranges (gasoline, diesel and oil) by method NWTPH. 4) A subset of four samples from borings B-1 and B-2 were analyzed for metals by EPA Method 6000/7000, volatile organic compounds (VOCs) by EPA Method 8260B and polychlorinated biphenyls (PCBs) by EPA Method 8082. 5) Four soil vapor samples were collected from the subsurface soil zone (approximately 10 feet bgs) and analyzed by EPA Method T0-15. Oil range hydrocarbons were detected in seven of the 19 samples. A single sample at 4,310 mg/kg exceeded DEQ risk-based concentration for diesel or heating Oil (RBC; Risk-Based Decision Making for the Remediation of Petroleum-Contaminated Sites, 2003) for urban residential exposure, taken at a depth of 5.5 feet bgs from boring B-7.
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