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Revised Construction Completion Report, Lower Columbia Slough

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Revised Construction Completion Report, Lower Columbia Slough Revised Construction Completion Report Lower Columbia Slough Pacific Carbide Portland, Oregon ECSI No. 268 Prepared for: Oregon Department of Environmental Quality Task Order No. 20-13-51 February 8, 2017 1888-04/Task 8 Table of Contents 1.0 INTRODUCTION ..................................................................................................................................... 1 1.1 Scope of Work ..................................................................................................................................... 1 2.0 BACKGROUND ....................................................................................................................................... 1 2.1 Site Location and Description .............................................................................................................. 1 2.2 Geology ............................................................................................................................................... 2 2.3 Site History .......................................................................................................................................... 2 2.4 Nature and Extent of Contamination.................................................................................................... 3 3.0 FIELD ACTIVITIES .................................................................................................................................. 4 3.1 Site Preparation ................................................................................................................................... 4 3.2 Bench Construction ............................................................................................................................. 5 3.3 Site Restoration ................................................................................................................................... 6 4.0 REFERENCES ........................................................................................................................................ 6 Figures 1 Site Location Map 2 Site Plan 3 Bench Construction Details Appendices A Permits and Access Agreements B Waste Disposal Documentation C Photograph Documentation D Topographic Surveys Revised Construction Completion Report Page i Lower Columbia Slough – Pacific Carbide, DEQ Task Order No. 20-13-51 February 8, 2017 1888-04/Task 8 1.0 Introduction This report documents the construction of an access bench on the bank of the Lower Columbia Slough (Slough) at the Pacific Carbide site (the Site). The bench was constructed in anticipation of a remedial action that will be conducted as part of the Columbia Slough Remedial Action approach described in the Record of Decision (ROD) for the Columbia Slough (Oregon Department of Environmental Quality (DEQ), 2005). Bench construction activities were completed under Task 7 of Task Order No. 20-13-51. Preliminary planning, design, and permitting for a summer 2016 removal action to address hot spots of high calcium concentrations and high pH at the Site was completed early in 2016. Preliminary sampling to refine the horizontal and vertical removal action extent identified high concentrations of calcium that extended to the maximum depth explored (5 feet below sediment surface). Due to the depth of high calcium concentrations, a redesign of the remedial approach was warranted, causing the implementation schedule to be delayed. The construction of the access bench was completed prior to Site remedial actions in order to serve as compensatory floodplain storage removal to offset activated carbon placement (fill) within the Lower Slough at the Pacific Meats Clean-up Site, as required by the City of Portland. 1.1 Scope of Work The scope of work for the access bench construction included: 1) Site preparation; 2) Pre-construction topographic survey; 3) Soil excavation, transportation, and disposal; 4) Site restoration; and 5) Post-construction topographic survey. 2.0 Background This section presents a description of the Site; the anticipated geology; previous work done at the Site; and the nature and extent of impacted sediments. 2.1 Site Location and Description The Site consists of the bank of the Lower Columbia Slough adjacent to an area of impacted sediment. The property was formerly owned by Pacific Carbide. It is located within the central portion of the Lower Slough section of the Columbia Slough, in the vicinity of the BNSF railroad crossing (river mile 5.5), in the City of Portland, Multnomah County, Oregon (Figures 1 and 2). The upland area is generally flat. In some locations on the Revised Construction Completion Report Page 1 Lower Columbia Slough – Pacific Carbide, DEQ Task Order No. 20-13-51 February 8, 2017 1888-04/Task 8 Pacific Carbide upland site, the top of the bank is up to approximately 10 feet higher than the site upland, and lies approximately 20 feet above the level of the Columbia Slough. At the access bench location to the north of the adjacent property to the east of the Pacific Carbide upland site (owned by Mark McCuddy), the top of bank is approximately one foot higher than the upland site. The bank is owned by the City of Portland. The upland facility is currently used as a trans-loading facility for warehousing of various products and as a storage yard. MG Warehouse operates a transfer and storage business in separate buildings in the southeast part of the property. The property is bordered by a Burlington Northern rail spur to the west, Columbia Boulevard to the south, industrial property to the east, and City of Portland property and the Columbia Slough to the north. The Lower Slough is approximately 8.5 miles long and discharges to the Willamette River. The Lower Slough is tidally influenced as it is directly connected to the Willamette River. The Columbia Slough and associated wetlands and bank provide habitat for a variety of birds, mammals, and other wildlife. The Columbia Slough Watershed drains approximately 32,700 acres of land, including areas in Fairview Lake and Fairview Creek, and portions of Troutdale, Fairview, Gresham, Maywood Park, Wood Village, and unincorporated Multnomah County. Historically the watershed contained channels, streams, lakes, ponds, and wetlands. As a result of urban development, the watershed has been altered, including building levees and draining and filling the wetland areas. The water has been channelized into what is now called the Columbia Slough. Side creeks and channels were filled in or diverted to underground pipes. The area is now an extensively managed surface water system with many water control structures. 2.2 Geology The primary near-site-vicinity regional geologic unit underlying the project Site has been mapped as surficial soil deposits of unconsolidated alluvium derived from river and stream deposits at the ground surface. These soils consist of sand and silt of recent age (Holocene Age, within the last 10,000 years) deposited on the flood plains of the Columbia River. Some of the materials are deposits of upstream formations re-worked by the Columbia River. This unit is typically found in thicknesses of less than 50 feet. This unit mantles the eroded surface of Pleistocene-aged, unconsolidated sand and silt alluvium deposits, and the eroded surface of Late- Pleistocene lacustrine (lake sediment) deposits. Based on materials observed during the bench excavation, the bank soils consisted predominantly of silt. The soils are most likely reworked materials derived from historical grading of the adjacent upland site. 2.3 Site History A ROD for the Pacific Carbide site was issued in April 2007 by the DEQ and included both upland and sediment remedial actions. Implementation of the ROD was to be conducted in phases, with the upland actions first. Revised Construction Completion Report Page 2 Lower Columbia Slough – Pacific Carbide, DEQ Task Order No. 20-13-51 February 8, 2017 1888-04/Task 8 Implementation of Phase 1 of the remedy was performed pursuant to a consent order issued to Pacific Carbide, dated September 28, 2007. In 2009, Pacific Carbide completed an additional investigation of Slough and upland sediments to refine the footprint and depth of lime sediment deposits for the planned removal. The sediment data indicated that sediment above the cleanup criteria was more extensive than previously estimated. In addition, PCBs were detected at potentially significant concentrations. This raised concerns about the feasibility of implementing the remaining elements of the 2007 ROD. Based on this information, Pacific Carbide requested DEQ to reconsider the selected remedy for the site. Remedial alternatives were evaluated in a revised Feasibility Study (FS) Report (CH2MHill, 2010). DEQ drafted a ROD Amendment but it was not finalized. DEQ subsequently negotiated a settlement with Pacific Carbide in the form of a Consent Judgment that was finalized in September 2013, under which DEQ assumed responsibility for in-water sediments and the bank. In January 2016, DEQ prepared a Removal Action Outline (Outline; DEQ, 2016) to guide the remedial action at the Site. The Outline presented objectives for remediation at the Site, removal action elements, and a tentative schedule for implementation. 2.4 Nature and Extent of Contamination In June 2006, 15 sediment samples were collected to investigate the extent of byproduct lime in Lower Columbia Slough sediment adjacent to the Site (CH2MHill, 2010). Samples were analyzed for metals and polycyclic aromatic hydrocarbons (PAHs). In September
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