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24-100687-Smelter Plume Assessment-02.22.24September 1, 2023 Revised September 8, 2023 Project No. T-8926 Mr. Geoffrey P. Sherwin Director of Acquisition and Entitlement JKM Holdings, LLC P.O. Box 188 Puyallup, Washington 98371 Subject: Tacoma Smelter Plume Site Assessment SW 316th Short Plat TSP 5101 -Southwest 316th Place Federal Way, Washington 98023 King County Tax Parcels 102103-9001, -9016, -9040 Dear Mr. Sherwin: We have completed our assessment of the project site for impacts from the Tacoma Smelter Plume. We understand the current project involves the subdivision of the site into single-family residential lots. Preliminary site plans do not indicate there will be any tree retention or wetland tracts associated with site redevelopment. Our assessment identified elevated arsenic above MTCA Method A cleanup levels in surficial site soil related to the Tacoma Smelter Plume (TSP) that will require remediation prior to redevelopment. The results of our assessment are presented in more detail below. SCOPE OF WORK We followed the procedures described in Ecology Publication 19-09-101, Asarco Tacoma Smelter Site-Model Remedies Plan for the Tacoma Smelter Plume. To determine the actual levels of arsenic, we divided the site into two Decision Units. These Decisions Units are based upon historical land use and proposed land use. 12220 113th Avenue NE, Ste. 130, Kirkland, Washington 98034 Phone (425) 821‐7777 Mr. Geoffrey P. Sherwin September 1, 2023 Revised September 8, 2023 Project No. T-8926 Page No. 2 The Decision Units consist of the following: Decision Unit Tax Parcels Predominant Land Cover Proposed Land Use Acreage DU-A -9001, -9016 Lawn, driveway and house Redeveloped 1.4 DU-B -9001, -9040 Forest Redeveloped 2.81 In Decision Unit A we collected samples for lead and arsenic analysis at a total of 18 locations. We sampled the upper six inches of soil at all locations. At one-fourth of the locations, we sampled from 6- to 12-inches-deep. We also collected a total of two composite duff samples. In Decision Unit B we collected samples for lead and arsenic analysis at a total of 32 locations. We sampled the upper six inches of soil at all locations. At one-fourth of the locations, we sampled from 6- to 12-inches-deep. We also collected a total of four composite duff samples. PROJECT DESCRIPTION The project site is an approximately 4.21-acre assemblage of 3 tax parcels located at 5101 Southwest 316th Place in Federal Way, Washington. The approximate location of the property and surroundings is shown in Figures 1 and 2. Figure 3 is a Sample Location Plan showing the proposed redeveloped subdivision of the existing parcels. The site is currently developed with a single-family residence located on the north portion of parcel 102103-9016. The residence is surrounded by ornamental landscaping and grass lawn. The roughly northern one-third of the site is currently covered with grass lawn, scattered mature trees, and blackberry vines. The southern two-thirds is covered by mature forest with a thick understory. The Geologic Map of the Tacoma 1:100,000-scale quadrangle, Washington by J.E. Schuster, A.A. Cabibbo, J.F. Schilter, and I.J. Hubert (2015) shows the site soils mapped as Recessional outwash (Qgo). The loose to compact, variably sorted soils observed in our subsurface explorations are generally consistent with this geologic map unit. Based on available topographic information, our field observations, and our local experience, groundwater will have a general flow direction towards the north or northwest. No shallow perched groundwater was found in our test pits. The groundwater will occur within the outwash soils at depths of 30 to 50 feet below site grades. Local variations in groundwater gradients will occur as a result of man-made features, such as drainage ditches, sewers, and roads. The topography of the area is shown on Figure 2. CURRENT SAMPLING The current sampling was conducted on August 16 through 18, 2023. Samples were obtained from a grid pattern superimposed on the site. A total of 50 locations were sampled. A total of 66 individual samples were analyzed for lead and arsenic. Sampling proceeded in general accordance with Ecology Publication 19-09-101. Mr. Geoffrey P. Sherwin September 1, 2023 Revised September 8, 2023 Project No. T-8926 Page No. 3 The sample locations are presented in Figure 3 attached to this report. The samples were placed into laboratory prepared glassware. Chain of custody protocols were followed for all samples. At the lab, the samples were prepared for analysis by sieving the samples through a 2mm (US No. 10) sieve to remove gravel. The test results for the current samples are attached in Appendix A. SAMPLE RESULTS The results of the current sampling are presented on Tables 1 through 3 attached to this report. Decision Unit A (DU-A) DU-A was assumed to be disturbed ground that had been cleared in the past. As shown on Table 1, arsenic values ranged from 2.0 to 20 mg/kg in the 0- to 6-inch interval. The average in the 0- to 6-inch interval for arsenic was 10.3 mg/kg. The average arsenic concentration in the 6- to 12-inch depth was 9.9 mg/kg. The average arsenic concentration for DU-A at both depths is below the MTCA Method A cleanup level of 20 mg/kg. The lead levels in the soil samples ranged from 5.2 to 170 mg/kg. The average lead level in the 0 to 6-inch depth was 37.3 mg/kg. The average lead level in the 6- to 12-inch depth was 75.25 mg/kg. The average lead level for both depths in DU- A is below the MTCA Method A cleanup level of 250 mg/kg. The levels of arsenic in the composite duff samples ranged from 2.9 to 4.2 mg/kg with an average level of 3.6 mg/kg. The levels of lead ranged from 5.7 to 11 mg/kg with an average level of 8.35 mg/kg. None of the concentrations of arsenic and lead exceed the applicable MTCA Method A cleanup values. Decision Unit B (DU-B) DU-B was predominately undisturbed ground consisting of mature forest. As shown in Table 2, the arsenic concentrations in the 0-6- inch interval ranged from 4.6 to 100 mg/kg. The average concentration of arsenic in the 0- to 6-inch interval was 23.9 mg/kg. The average arsenic concentration in the 6- to 12-inch depth was 11.25 mg/kg. The average arsenic concentration for the 0-6- inch interval in DU-B exceeded the MTCA Method A cleanup value of 20 mg/kg. The lead concentration in the soil samples ranged from 5.3 to 180 mg/kg. The average lead concentration in the 0- to 6-inch depth was 49.3 mg/kg. The average lead level in the 6- to 12-inch depth was 21.1 mg/kg. Both the average lead levels for DU-B are all below the cleanup level. The concentrations of arsenic in the composite duff samples ranged from 3.1 to 15 mg/kg with an average concentration of 10.65 mg/kg. The levels of lead ranged from 6.1 to 44 mg/kg with an average concentration of 30.8 mg/kg. DISCUSSION Following the guidelines established in Ecology Publication 19-09-101, elevated arsenic exceeding MTCA Method A cleanup values related to the TSP was identified in the upper six inches of soil in DU-B. No other elevated concentrations of arsenic or lead were identified in this assessment. Ecology provides several model remedies to perform soil cleanup of elevated arsenic related to the TSP. In our recent experience, mixing the upper 6-12 inches of soil with the soils immediately beneath it adequately dilutes the concentrations below applicable cleanup levels. This can be conducted prior to, or concurrent with, site redevelopment. Mr. Geoffrey P. Sherwin September l , 2023 Revised September 8, 2023 Confirmation soil sampling will be required to obtain a No Further Action (NF A) letter from Ecology. We recommend reporting the release through the Statewide Environmental Incident Report Form (ERTS) and enrolling in the Voluntary Cleanup Program (VCP). LIMITATIONS The findings, conclusions, and recommendations presented in this report are our professional opinions based on our documented site observations, our review of current Ecology guidelines, our recent local experience, and the analytical testing summarized in this report. Other information related to past site uses or current site conditions may exist. If further information on the site becomes available, Terra Associates, Inc. should review the information, as it may affect our conclusions. We prepared our conclusions and recommendations in general accordance with current guidance from Ecology and generally accepted local professional engineering practices in use at this time. We make no other warranty, either expressed, or implied. The report is the copyrighted property of Terra Associates, Inc. and is for the specific application to the SW 316th Place Short Plat project in Federal Way, Washington. This letter is for the exclusive use of JKM Holdings, LLC and their authorized representatives. We trust the information presented is sufficient for your current needs. If you have any questions or require additional information, please call. Nicolas R Hoffman Attachments: Table 1 -Analytical Test Result Summary DU-A Table 2 -Analytical Test Result Summary-DU-B Table 3 -Analytical Test Result Summary-Duff Samples Figure 1 -Site Vicinity Map Figure 2 -Topographic Vicinity Map Figure 3-Sample Location Plan Appendix A-Analytical Test Report Project No. T-8926 Page No. 4 9-8-2023 Table 1 Decision Unit A Analytical Test Result Summary Sample Location Depth (inches) As (mg/kg) Pb (mg/kg) Sample Location Depth (inches) As (mg/kg) Pb (mg/kg) A-1 0-6 4.6 5.3 A-11 0-6 7.2 25 A-2 0-6 2.6U 5.2U A-12 0-6 19 55 A-3 0-6 5.9 9.7 6-12 18 61 A-4 0-6 7.6 28 A-13 0-6 15 39 6-12 11 42 A-14 0-6 13 38 A-5 0-6 4.1 12 A-15 0-6 13 38 A-6 0-6 6.4 20 A-16 0-6 11 30 A-7 0-6 8.7 42 6-12 8.6 28 A-8 0-6 20 170 A-17 0-6 12 39 6-12 20 170 A-18 0-6 13 42 A-9 0-6 7.9 20 A-10 0-6 14 43 Average Arsenic 0-6” 10.3 37.3 Average Arsenic 6-12” MTCA Method A 9.9 75.25 MTCA Method A 20 250 20 250 Notes: All values shown in italics are average concentrations. Project No. T-8926 Table 2 Decision Unit B Analytical Test Result Summary Sample Location Depth (inches) As (mg/kg) Pb (mg/kg) Sample Location Depth (inches) As (mg/kg) Pb (mg/kg) B-1 0-6 14 41 B-17 0-6 45 130 B-2 0-6 19 50 B-18 0-6 26 40 B-3 0-6 20 56 B-19 0-6 5.2 11 B-4 0-6 19 55 B-20 0-6 12 17 6-12 5.9 15 6-12 8.5 14 B-5 0-6 17 52 B-21 0-6 38 59 B-6 0-6 17 49 B-22 0-6 16 20 B-7 0-6 20 54 B-23 0-6 12 25 B-8 0-6 10 19 B-24 0-6 23 21 6-12 3.5 6.8 6-12 5.9 5.3U B-9 0-6 18 42 B-25 0-6 15 5.3U B-10 0-6 8.3 11 B-26 0-6 15 17 B-11 0-6 48 140 B-27 0-6 4.6 5.6 B-12 0-6 26 45 B-28 0-6 13 34 6-12 8.9 18 6-12 4.7 5.4U B-13 0-6 32 50 B-29 0-6 11 16 B-14 0-6 46 81 B-30 0-6 100 180 B-15 0-6 23 49 B-31 0-6 27 27 B-16 0-6 48 140 B-32 0-6 17 35 6-12 46 96 6-12 6.6 6.4 Average Arsenic 0-6” 23.9 49.3 Average Arsenic 6-12” MTCA Method A 11.25 21.1 MTCA Method A 20 250 20 250 Notes: All values shown in italics are average values. Values highlighted in blue exceed applicable MTCA Method A cleanup values. Project No. T-8926 Table 3 Duff Samples DU-A and DU-B Sample Location Arsenic Lead D-A-1 2.9U 5.7U D-A-2 4.2 11 D-B-1 9.5 44 D-B-2 3.1U 6.1U D-B-3 15 43 D-B-4 15 30 Average Duff DU A 3.6 8.4 Average Duff DU B 10.7 30.8 MTCA 20 250 Project No. T-8926 ROSEHILLA Browns Commencement Bay OLD-TACOMA MultiCare Tacoma G�ner:al Hospital Wo TERRA ASSOCIATES Figure 1 1000 1000 0 0.5 500 1000 0 0 0.5 2000 3000 KILOMETERS z METERS 1000 2000 0 MILES 4000 5000 6000 7000 8000 9000 10000 FEET TERRA ASSOCIATES Geotechnical Consultant ', ___ _I __ R/W >-+--==�---!----J---t---'-._-�--+--;::,--- - --- - - - ---��;;��----��W;��--------------------------,------------... ------- N:--0.:2-8'�42��-W�12�33:"':..4��-..-----------------------------------------------------------------------g-,-R/W �--' -3�- KEY <o.�<'<· ---� ® A-1 Approximate Sample Location in DU A ® B-1 Approximate Sample Location in DUB '-�,, 77.00' 1 /Q\.: � i. ,,, � .. @,-®67® @:w---@�®A-7 A-12 A-13 A-18 B 1 B 6 I --B-7 --IQ\ 5 1/Q\ 6 � 7 ® ! ® ® ® '<Y '<Y '<Y A-8 � A-11 -14 A-17 i B-2 B-5 B-8I I ® ® A-9 A-10 ® B-3 ® ® B-4 67.w . -9 67.00" @B B-11 ® B-10 N0"28'42"W 920.06' Scale: 1"=100' --0 25 50 100 TOPOGRAPHY NOTE: TOPOGRAPHY AND BOUNDARY HAS BffN PREPARED FROM KING COUNTY G./.S. MAPPING INFORMATION AND INFORMATION PROVIDED BY TH£ CLIENT. THIS IS NOT A SURVEY. Base Image: Preliminary Site Plan by Larson and Associates Dated August 2023. @9 B-14 ® B-15 ® � B-17 TERRA ASSOCIATES Geotechnical Consultant ® B-19 ® B-21 ® B-24 ® B-25 ® B-26 ® B-27 Proj. Nd. T-8926 ® B-30 ® 6<) B-32 8�9 14� ® . @ B-31 B-28 Sample Location Plan SW 316th Place TSP Federal Way, Washington Date SEP 2023 Figure 3 APPENDIX A ANALYTICAL TEST REPORT Project No. T-8926 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 14648 NE 95th Street, Redmond, WA 98052 x (425) 883-3881 August 25, 2023 Nick Hoffman Terra Associates, Inc. 12220 113th Avenue NE, Suite 130 Kirkland, WA 98034 Re: Analytical Data for Project 8926 Laboratory Reference No. 2308-184 Dear Nick: Enclosed are the analytical results and associated quality control data for samples submitted on August 16, 2023. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 Case Narrative Samples were collected on August 16, 2023 and received by the laboratory on August 16, 2023. They were maintained at the laboratory at a temperature of 2 oC to 6oC. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. Total Metals EPA 6010D Analysis Samples were sieved through a 2mm sieve prior to digestion and percent moisture determination. Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote reference and discussed in detail on the Data Qualifier page. 3 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: A-1 0-6 Laboratory ID: 08-184-01 Arsenic 4.6 2.6 EPA 6010D 8-23-23 8-23-23 Lead 5.3 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-2 0-6 Laboratory ID: 08-184-02 Arsenic ND 2.6 EPA 6010D 8-23-23 8-23-23 Lead ND 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-3 0-6 Laboratory ID: 08-184-03 Arsenic 5.9 2.6 EPA 6010D 8-23-23 8-23-23 Lead 9.7 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-4 0-6 Laboratory ID: 08-184-04 Arsenic 7.6 2.6 EPA 6010D 8-23-23 8-23-23 Lead 28 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-4 6-12 Laboratory ID: 08-184-05 Arsenic 11 10 EPA 6010D 8-23-23 8-23-23 Lead 42 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-5 0-6 Laboratory ID: 08-184-06 Arsenic 4.1 2.6 EPA 6010D 8-23-23 8-23-23 Lead 12 5.1 EPA 6010D 8-23-23 8-23-23 Client ID: A-6 0-6 Laboratory ID: 08-184-07 Arsenic 6.4 2.6 EPA 6010D 8-23-23 8-23-23 Lead 20 5.2 EPA 6010D 8-23-23 8-23-23 4 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: A-7 0-6 Laboratory ID: 08-184-08 Arsenic 8.7 2.6 EPA 6010D 8-23-23 8-23-23 Lead 42 5.1 EPA 6010D 8-23-23 8-23-23 Client ID: A-8 0-6 Laboratory ID: 08-184-09 Arsenic 20 2.6 EPA 6010D 8-23-23 8-23-23 Lead 170 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-8 6-12 Laboratory ID: 08-184-10 Arsenic 20 2.6 EPA 6010D 8-23-23 8-23-23 Lead 170 5.2 EPA 6010D 8-23-23 8-23-23 Client ID: A-9 0-6 Laboratory ID: 08-184-11 Arsenic 7.9 2.6 EPA 6010D 8-23-23 8-23-23 Lead 20 5.3 EPA 6010D 8-23-23 8-23-23 Client ID: A-10 0-6 Laboratory ID: 08-184-12 Arsenic 14 2.7 EPA 6010D 8-23-23 8-23-23 Lead 43 5.3 EPA 6010D 8-23-23 8-23-23 Client ID: A-11 0-6 Laboratory ID: 08-184-13 Arsenic 7.2 2.7 EPA 6010D 8-23-23 8-23-23 Lead 25 5.3 EPA 6010D 8-23-23 8-23-23 Client ID: A-12 0-6 Laboratory ID: 08-184-14 Arsenic 19 2.7 EPA 6010D 8-23-23 8-23-23 Lead 55 5.5 EPA 6010D 8-23-23 8-23-23 5 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: A-12 6-12 Laboratory ID: 08-184-15 Arsenic 18 2.7 EPA 6010D 8-23-23 8-23-23 Lead 61 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: A-13 0-6 Laboratory ID: 08-184-16 Arsenic 15 2.7 EPA 6010D 8-23-23 8-23-23 Lead 39 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: A-14 0-6 Laboratory ID: 08-184-17 Arsenic 13 2.7 EPA 6010D 8-23-23 8-23-23 Lead 38 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: A-15 0-6 Laboratory ID: 08-184-18 Arsenic 13 2.8 EPA 6010D 8-23-23 8-23-23 Lead 38 5.6 EPA 6010D 8-23-23 8-23-23 Client ID: A-16 0-6 Laboratory ID: 08-184-19 Arsenic 11 2.8 EPA 6010D 8-23-23 8-23-23 Lead 30 5.6 EPA 6010D 8-23-23 8-23-23 Client ID: A-16 6-12 Laboratory ID: 08-184-20 Arsenic 8.6 2.8 EPA 6010D 8-23-23 8-23-23 Lead 28 5.6 EPA 6010D 8-23-23 8-23-23 Client ID: A-17 0-6 Laboratory ID: 08-184-21 Arsenic 12 2.8 EPA 6010D 8-23-23 8-23-23 Lead 39 5.6 EPA 6010D 8-23-23 8-23-23 6 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: A-18 0-6 Laboratory ID: 08-184-22 Arsenic 13 2.8 EPA 6010D 8-23-23 8-23-23 Lead 42 5.6 EPA 6010D 8-23-23 8-23-23 Client ID: B-1 0-6 Laboratory ID: 08-184-23 Arsenic 14 3.0 EPA 6010D 8-23-23 8-23-23 Lead 41 5.9 EPA 6010D 8-23-23 8-23-23 Client ID: B-2 0-6 Laboratory ID: 08-184-24 Arsenic 19 2.9 EPA 6010D 8-23-23 8-23-23 Lead 50 5.8 EPA 6010D 8-23-23 8-23-23 Client ID: B-3 0-6 Laboratory ID: 08-184-25 Arsenic 20 2.7 EPA 6010D 8-23-23 8-23-23 Lead 56 5.5 EPA 6010D 8-23-23 8-23-23 Client ID: B-4 0-6 Laboratory ID: 08-184-26 Arsenic 19 2.7 EPA 6010D 8-23-23 8-23-23 Lead 55 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: B-4 6-12 Laboratory ID: 08-184-27 Arsenic 5.9 2.7 EPA 6010D 8-23-23 8-23-23 Lead 15 5.3 EPA 6010D 8-23-23 8-23-23 Client ID: B-5 0-6 Laboratory ID: 08-184-28 Arsenic 17 2.7 EPA 6010D 8-23-23 8-23-23 Lead 52 5.5 EPA 6010D 8-23-23 8-23-23 7 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 TOTAL METALS EPA 6010D QUALITY CONTROL Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0823SM1 Arsenic ND 2.5 EPA 6010D 8-23-23 8-23-23 Lead ND 5.0 EPA 6010D 8-23-23 8-23-23 Laboratory ID: MB0823SM2 Arsenic ND 2.5 EPA 6010D 8-23-23 8-23-23 Lead ND 5.0 EPA 6010D 8-23-23 8-23-23 Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 08-184-01 ORIG DUP Arsenic 4.41 2.83 NA NA NA NA 44 20 C Lead 5.10 5.20 NA NA NA NA 2 20 Laboratory ID: 08-184-21 ORIG DUP Arsenic 10.9 10.5 NA NA NA NA 4 20 Lead 35.0 34.3 NA NA NA NA 2 20 MATRIX SPIKES Laboratory ID: 08-184-01 MS MSD MS MSD MS MSD Arsenic 84.8 88.1 100 100 4.41 80 84 75-125 4 20 Lead 245 245 250 250 5.10 96 96 75-125 0 20 Laboratory ID: 08-184-21 MS MSD MS MSD MS MSD Arsenic 103 102 100 100 10.9 92 91 75-125 1 20 Lead 300 300 250 250 35.0 106 106 75-125 0 20 8 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 % MOISTURE Date Client ID Lab ID % Moisture Analyzed A-1 0-6 08-184-01 3 8-22-23 A-2 0-6 08-184-02 3 8-22-23 A-3 0-6 08-184-03 4 8-22-23 A-4 0-6 08-184-04 4 8-22-23 A-4 6-12 08-184-05 5 8-22-23 A-5 0-6 08-184-06 2 8-22-23 A-6 0-6 08-184-07 4 8-22-23 A-7 0-6 08-184-08 3 8-22-23 A-8 0-6 08-184-09 4 8-22-23 A-8 6-12 08-184-10 5 8-22-23 A-9 0-6 08-184-11 5 8-22-23 A-10 0-6 08-184-12 6 8-22-23 A-11 0-6 08-184-13 6 8-22-23 A-12 0-6 08-184-14 9 8-22-23 A-12 6-12 08-184-15 8 8-22-23 A-13 0-6 08-184-16 7 8-22-23 A-14 0-6 08-184-17 7 8-22-23 A-15 0-6 08-184-18 10 8-22-23 A-16 0-6 08-184-19 11 8-22-23 A-16 6-12 08-184-20 11 8-22-23 A-17 0-6 08-184-21 10 8-22-23 A-18 0-6 08-184-22 10 8-22-23 B-1 0-6 08-184-23 15 8-22-23 B-2 0-6 08-184-24 14 8-22-23 B-3 0-6 08-184-25 8 8-22-23 B-4 0-6 08-184-26 8 8-22-23 B-4 6-12 08-184-27 6 8-22-23 9 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 16, 2023 Laboratory Reference: 2308-184 Project: 8926 % MOISTURE Date Client ID Lab ID % Moisture Analyzed B-5 0-6 08-184-28 8 8-22-23 10 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical ____________. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1 - Sample extract treated with a sulfuric acid/silica gel cleanup procedure. X2 - Sample extract treated with a silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in methods 8260 & 8270, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Y1 - Negative effects of the matrix from this sample on the instrument caused values for this analyte in the bracketing continuing calibration verification standard (CCVs) to be outside of 20% acceptance criteria. Because of this, quantitation limits and sample concentrations should be considered estimates. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference onsne Environmental Inc Analytical Laboratory Testing Services I 14648 NE 95th Street • Redmond, WA 9805 2 Phone: (425) 883-3881 • www.onsite-env.com Company:.,_. I\ -.� .. TN C/ (1'Ai) le�M . Project Number: R � L{., Project Name: Project Manag � tr li Sampled by: /Vi. "'-"- Lab ID I A-\ <)__ A-7-_g /\-3 \A-'1 s; A-u. (p A-5 'I A-lo �-7 '7 Pr-'5 ,o Pt-� Relinquished Received Relinquished Received Relinquished Received Reviewed/Date H n.=.r-M;..µ '?�E. Samnle Identification O-f, {)-� 0-� O-b�-,L-o-eo 0-b 0- � 0--Co t6---n., � Signature// � /I -7M,tu�. -,v _,.., � - Chain of Custody Page_l_of 3 Turnaround Request Laboratory Number: ·ns-1 84 (In working days) (Check One) D Same Day 0 1 Day ::;; � 6D 2Days D 3Days "' .;:; g ;;; a, "' 0 fil ;;; 1p(standard fl Days) a, 6 ,;: a, 'O "' 0 C: ., □C. <O = fil ·5 'O ;g 0 ., i ,:;:; :::, "'> :12 :2 <O t! C. a, I!! ::;; 2 0 -e 0 ill "' .'!! �¥ � ii a. � � C e. 2 "'., s c3 � l 0 ., J: "'"' "' � � 8: = 0.. 2 � oi C CJ g ::;; Cl) 0 :12 ai & +-□ � a, -.r; 0 Cl C> Cl �g 8l � � C C. <( ::;; ::;; (.) c3 'x al 0 ·c: "' "' 'O j(other) ;; X )( "' a, =�"' 0 0 al � <( oi C & J: CJ CJ Cl a, iii a, :c .r; � ai ti! rt iii ' ,.._ iii ::, .. ± ± ± ± 1 C ]] "' 0 8 C. (.) ::;; :§. i a, ., a, a, 0 C a: ::;; ... a. a. a. � � 8' w "' (I) C C ·c a. 0 Date Time E � � � CD -� ;e J: CD ti! tll .2 J§ J§ _, ::;; ::;; =g oi Cl rt (.) e> e> .r; i2 i2 � Samnled Sampled Matrix z z z z z J: w Cl) .!. a. 0 0 (.) J: "#. B�t/23 82.o s l >< }ag2,5 �10 Btto �YS' �� 900 9o5 � �\o ?\ 1,0 'IJ I 'u 1,� ,V Company Date Time Comments/Special Instructions TAr 8 'I� 23 /��? I�� f}, .... - k_ ''J G,W\+, 9f'b�c._olSr� I I - Data Package: Standard D Level Ill D Level IV 0 Reviewed/Date Chromatograms with final report D Electronic Data Deliverables (EDDs) D OnSite Environmental Inc Analytical Laboratory Testing Services I 14648 NE 95th Street· Redmond, WA 9805 2 Phone: (425) 883-3881 • www.onsite-env.com Company: /1 1 f:llP.A--�-,.,r .1.1-tr �;:,, Tuc(,At) Project Number: RCf 1-f, Project Name: Project Manager: /\ h-r .,__, +\-oFPMA�Sampled by/\,1,A)( �tc__e Lab ID Sample Identification t \ A-9 0-b,1-A-to 0-b,� A--11 0-b,1 A--/2-0-0,r A-/2-fo-/2 / I., A-r�O-b11 A-I� ()-�1J A--15 0-ColtJJ A-1{, o-G U)A-JC:. �-n.. Signature,.#� /} Relinquished //��LL , Received -/ ..... Relinquished Received Relinquished Received Reviewed/Date Chain of Custody Page 2-, of 7 08-1H4Turnaround Request Laboratory Number: (in working days) (Check One) ::;; D Same Day 0 1 Day � a D 2Days D 3Days N ;,; 0 cc co <O fil N a 0 co � co � II) J � Standard (J Days) 0 C =II) Q) st D a. <O 0 ., ., � u <O -�::, N 0 � 1'i C: co ::;; a'i :g � I:'.! 0 ., eCl) 0 j 1 Q) ci5 en l � 0.. ., jC: e. I II) ·;;; i o:c Q) :c II) II) II) � (.) �� = 0.. 2 i � "' (!l g ::;; 0 :g � □ C) I-� co -Q) .t: 0 0) a CD � 0 II) Q) @ C a. <( ::;; ::;; -¼-' (.) 0 � <O I i5 Q) > ·c II) II) i -g (other) 0 X X N co :S � 0 N 0 0 u � <( 1 � Ji= (!l (,' a co 1E ,._ co :c .t: � (.) "' � ::, -± ± II) $ 3: N 0 0 a. (.) � sCl) :c :c C g .Q co co 0 0 C ::;; .; � Q) cc .c � � � 0.. j Ol w II) II) C C ·c 0.. ·oDate Time E � 0 CD lE :c CD "' "' 0 iij g _J ::;; ::;; � iij a 1E (.) e> e> :c j§ � � w � Sampled Sampled Matrix z z z z z :c w Cl)� 0.. 0 0 (.) :c � 8/IL/7.,1 • 92-S 5 I X �a 930 9.'-15' "S"o /000 (o I c fol!) /ot{o lbSS \.j '/ 'J ' \!/ I \\D .,,, Company Date Time Comments/Sp ecial Instructions TAJ=�/16/z.-3 Jqz,,5 \<,� �-P<otoCQlS� ft!lfil7p. w,zf"" Data Package: Standard D Level Ill □Level IV □ Reviewed/Date Chromatograms with final report D Electronic Data Deliverables (EDDs) 0 OnSite Environmental Inc Analytical Laboratory Testing Services 14648 NE 95th Street • Redmond, WA 9805 2 Phone: (425) 883-3881 • www.onsite-env.com Company:, �o 12_ " A-ssoc..Vt� u.Jc__(7J+ z::) Project Number: F59U Project Name: Project Manager: H:oFFN,u.J �Sampled by: /Vi.Ax., 1f R-cr � Lab ID Sample Identification 1/l.-l A-11 0-bzz_ A-,3 04-b I-ZS 15 -, V-0Z'1 g_-z._ o-G 9., 13-:> o-b �'6-<-f o-b 'ri-1 "B-4 0-/2 2S( B-5 O--(o Signature .d J Relinquished �� Chain of Custody Turnaround Request Laboratory Number: (In working days) (Check One) D Same Day 01 Day Ei D 2Days 0 3Days 0 <O N C0 a $: J8l Standard (7 Days) 0 c D C. co 0 ::, N � c GO �., 0 "'"'.$ C: !!<, .S! Q) ·.; �I I (.) c C!l g□ 0 Cl fQ. c.:i 2 al 0 0 (other) ci X X N C0 ::i: C!l C!l Cl C0 ;;; -± ± ± ± 11 C: 8: .,.. ""'Cl. Cl. Cl. Cl. w Date Time E �� 8' [ll Sampled Matrix ::I g .; Cl Sampled z z z z z ::i: w 3/rf;/i ) \\1.--S >) \\37 1\50 \2CJ5 1230 1-i L\'5 125S \-131 5 'U \ Company Date llme ---TAT 8/lb/2.::.� /42f Received � -- �S<l t lJJ< 1'-1"2� "-Relinquished -t •I Received Relinquished Received Reviewed/Date Reviewed/Date Page 3, of� nA-1 RA. ....N ;;;�C0 C0 &! co0 jC0 'O "'"' ,� �gi � 'O > 'O ·;; � ::i: "'·;;"' :e j_ �en l �Cl. ., "' o::J: Q) ::i: "'.!!l "' ��Cl. 2 � "' m ::i: 0 'O .; GO-"'.r. u Ol C: ::i: gi � I � C. <{ ::i: "''O + ;� "'0 j �<{ .; C: �GO .r. .r. (.) .; ., 13 .!!l;:: �0 " C. "'(.) I-::i: s �§? .2 GO 0 0 C: a: ::i: "'C: C: ·g ·o·E="'"' "' 1§ 1§ Cl. ::i: ::i: [ll e>e>..J J.:�8: (.) :c ��w Cl. 0 0 (.) :c �x �� i, ,v Comments/Special Instructions k·,�� '( OJ toc.c ts. Data Package: Standard □ Level Ill □ Level IV □ Chromatograms with final report D Electronic Data Deliverables (EDDs) D OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 14648 NE 95th Street, Redmond, WA 98052 x (425) 883-3881 August 25, 2023 Nick Hoffman Terra Associates, Inc. 12220 113th Avenue NE, Suite 130 Kirkland, WA 98034 Re: Analytical Data for Project 8926 Laboratory Reference No. 2308-197 Dear Nick: Enclosed are the analytical results and associated quality control data for samples submitted on August 17, 2023. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 17, 2023 Laboratory Reference: 2308-197 Project: 8926 Case Narrative Samples were collected on August 17, 2023 and received by the laboratory on August 17, 2023. They were maintained at the laboratory at a temperature of 2 oC to 6oC. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. Total Metals EPA 6010D Analysis Samples were sieved through a 2mm sieve prior to digestion and percent moisture determination. Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote reference and discussed in detail on the Data Qualifier page. 3 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 17, 2023 Laboratory Reference: 2308-197 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: B-6 0-6 Laboratory ID: 08-197-01 Arsenic 17 2.7 EPA 6010D 8-23-23 8-23-23 Lead 49 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: B-7 0-6 Laboratory ID: 08-197-02 Arsenic 20 2.7 EPA 6010D 8-23-23 8-23-23 Lead 54 5.5 EPA 6010D 8-23-23 8-23-23 Client ID: B-8 0-6 Laboratory ID: 08-197-03 Arsenic 10 2.7 EPA 6010D 8-23-23 8-23-23 Lead 19 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: B-8 6-12 Laboratory ID: 08-197-04 Arsenic 3.5 2.7 EPA 6010D 8-23-23 8-23-23 Lead 6.8 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: B-9 0-6 Laboratory ID: 08-197-05 Arsenic 18 2.8 EPA 6010D 8-23-23 8-23-23 Lead 42 5.6 EPA 6010D 8-23-23 8-23-23 Client ID: B-10 0-6 Laboratory ID: 08-197-06 Arsenic 8.3 2.7 EPA 6010D 8-23-23 8-23-23 Lead 11 5.4 EPA 6010D 8-23-23 8-23-23 Client ID: B-11 0-6 Laboratory ID: 08-197-07 Arsenic 48 2.9 EPA 6010D 8-23-23 8-23-23 Lead 140 5.9 EPA 6010D 8-23-23 8-23-23 4 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 17, 2023 Laboratory Reference: 2308-197 Project: 8926 TOTAL METALS EPA 6010D QUALITY CONTROL Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0823SM2 Arsenic ND 2.5 EPA 6010D 8-23-23 8-23-23 Lead ND 5.0 EPA 6010D 8-23-23 8-23-23 Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 08-184-21 ORIG DUP Arsenic 10.9 10.5 NA NA NA NA 4 20 Lead 35.0 34.3 NA NA NA NA 2 20 MATRIX SPIKES Laboratory ID: 08-184-01 MS MSD MS MSD MS MSD Arsenic 103 102 100 100 10.9 92 91 75-125 1 20 Lead 300 300 250 250 35.0 106 106 75-125 0 20 5 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 25, 2023 Samples Submitted: August 17, 2023 Laboratory Reference: 2308-197 Project: 8926 % MOISTURE Date Client ID Lab ID % Moisture Analyzed B-6 0-6 08-197-01 7 8-22-23 B-7 0-6 08-197-02 9 8-22-23 B-8 0-6 08-197-03 7 8-22-23 B-8 6-12 08-197-04 8 8-22-23 B-9 0-6 08-197-05 10 8-22-23 B-10 0-6 08-197-06 7 8-22-23 B-11 0-6 08-197-07 15 8-22-23 6 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical ____________. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1 - Sample extract treated with a sulfuric acid/silica gel cleanup procedure. X2 - Sample extract treated with a silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in methods 8260 & 8270, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Y1 - Negative effects of the matrix from this sample on the instrument caused values for this analyte in the bracketing continuing calibration verification standard (CCVs) to be outside of 20% acceptance criteria. Because of this, quantitation limits and sample concentrations should be considered estimates. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental Inc Analytical Laboratory Testing Services I 14648 NE 95th Street • Redmond, WA 9805 2 Phone: (425) 883-3881 • www.onsite -env.com Company: r �-£:\-A-ss.6} C;; hTf:S I '\ Tue.. { I 1-fJ., J Project Numb ePfJ?_(.__ Project Name: - Project Ma l\) r: tC.V-t\ o F� MAtJSampled by: MAX. °?R� Lab ID Sample Identification \ 8-b 0-£ 2. B-1 0-l, 3 '3-g 0-1,.., L\ �-�(r.-1'2. s i-9 D-f, ltJ \3-\D t)--'=, 1 \:>- \ \ D-b Signature ,4 ./ /) Chain of Custody Turnaround Request Laboratory Number: (in working days) (Check One) D Same Day 0 1 Day Ei D 2 Days D 3Days 0 a. CX) :J N c -;;: J8Lstandard (7 Days) IX) "' 0 □ .91 c (0 0 N 0 f? N ('.) IX) I!? a, 0 en "' ! C !:2-.91 i -� X :2 C LlJ g □ 0 iii 0 c..> Cl � 0 0 0 )( (0 * (other) 0 X X N IX) I ('.) ('.) Cl IX)-± ± ± ± "' 'It C a, .91 Q) .Q a.. a.. a.. a.. C) LlJ � Date Time E � � � � 0 ti) Sampled Matrix :::, g iii Cl Sampled z z z z z I LlJ 8/17/23 \2..� 5 I 11.-50 I ?:,l)O 13)5 1�2S-- C34S " V 1355 ,I ' / Company Date Time Relinquished 4///Ad� TA� 8'11/v I �:,0 Received � -� -· ose ij n/73 �1.-P�O Relinquished Received Relinquished Received Reviewed/Date Reviewed/Date Page __ ,_of_l__ n-A=--1 � 7 � \,,_ N Ji co IX) "'"' co 0 (I) IX) -0 "' "' ·u Q) ;g cii -0 (I) � > -0 ·u ;e ::e (I) ·u@en l � a.. iii Q) + oI (I) "' I "' "' �� a.. 2 '" iii "' 0 :2 ., ., � IX)_ :a (I) .c 0 C) 1"'Q) � C a. <l: :a :a "' Q) > '§ "' -0 =� N a al <l: <l: � C � .!H .... IX) :c .c a: 0 "' N 0 0 a. iii 0 I-:J IX) :a :§. 1n g .Q IX) a 0 C ::e "' C C ·c a: ·5 "' a.. E£ I ti) "' "' a '" iii ...J :a :a in. 'It 0 e>e>:c � � 0 a.. 0 0 0 I-I ;,'< lY yJ yJ '() ·y. '{) 'P '-v �'I- Comments/Special Instructions k-uJ� Co. 7 n, To c.,0LS Data Package: Standard D Level Ill 0 Level IV 0 Chromatograms with final report D Electronic Data Deliverables (EDDs) D OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 14648 NE 95th Street, Redmond, WA 98052 x (425) 883-3881 August 29, 2023 Nick Hoffman Terra Associates, Inc. 12220 113th Avenue NE, Suite 130 Kirkland, WA 98034 Re: Analytical Data for Project 8926 Laboratory Reference No. 2308-217 Dear Nick: Enclosed are the analytical results and associated quality control data for samples submitted on August 18, 2023. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 Case Narrative Samples were collected on August 18, 2023 and received by the laboratory on August 18, 2023. They were maintained at the laboratory at a temperature of 2 oC to 6oC. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. Total Metals EPA 6010D Analysis Samples were sieved through a 2mm sieve prior to digestion and percent moisture determination. Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote reference and discussed in detail on the Data Qualifier page. 3 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: B-12 0-6 Laboratory ID: 08-217-01 Arsenic 26 2.7 EPA 6010D 8-28-23 8-28-23 Lead 45 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-12 6-12 Laboratory ID: 08-217-02 Arsenic 8.9 2.7 EPA 6010D 8-28-23 8-28-23 Lead 18 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-13 0-6 Laboratory ID: 08-217-03 Arsenic 32 2.7 EPA 6010D 8-28-23 8-28-23 Lead 50 5.5 EPA 6010D 8-28-23 8-28-23 Client ID: B-14 0-6 Laboratory ID: 08-217-04 Arsenic 46 2.8 EPA 6010D 8-28-23 8-28-23 Lead 81 5.7 EPA 6010D 8-28-23 8-28-23 Client ID: B-15 0-6 Laboratory ID: 08-217-05 Arsenic 23 2.7 EPA 6010D 8-28-23 8-28-23 Lead 49 5.5 EPA 6010D 8-28-23 8-28-23 Client ID: B-16 0-6 Laboratory ID: 08-217-06 Arsenic 48 2.8 EPA 6010D 8-28-23 8-28-23 Lead 140 5.6 EPA 6010D 8-28-23 8-28-23 Client ID: B-16 6-12 Laboratory ID: 08-217-07 Arsenic 46 2.8 EPA 6010D 8-28-23 8-28-23 Lead 96 5.5 EPA 6010D 8-28-23 8-28-23 4 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: B-17 0-6 Laboratory ID: 08-217-08 Arsenic 45 2.8 EPA 6010D 8-28-23 8-28-23 Lead 130 5.5 EPA 6010D 8-28-23 8-28-23 Client ID: B-18 0-6 Laboratory ID: 08-217-09 Arsenic 26 2.7 EPA 6010D 8-28-23 8-28-23 Lead 40 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-19 0-6 Laboratory ID: 08-217-10 Arsenic 5.2 2.6 EPA 6010D 8-28-23 8-28-23 Lead 11 5.2 EPA 6010D 8-28-23 8-28-23 Client ID: B-20 0-6 Laboratory ID: 08-217-11 Arsenic 12 2.7 EPA 6010D 8-28-23 8-28-23 Lead 17 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: B-20 6-12 Laboratory ID: 08-217-12 Arsenic 8.5 2.7 EPA 6010D 8-28-23 8-28-23 Lead 14 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: B-21 0-6 Laboratory ID: 08-217-13 Arsenic 38 2.7 EPA 6010D 8-28-23 8-28-23 Lead 59 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-22 0-6 Laboratory ID: 08-217-14 Arsenic 16 2.7 EPA 6010D 8-28-23 8-28-23 Lead 20 5.4 EPA 6010D 8-28-23 8-28-23 5 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: B-23 0-6 Laboratory ID: 08-217-15 Arsenic 12 2.8 EPA 6010D 8-28-23 8-28-23 Lead 25 5.5 EPA 6010D 8-28-23 8-28-23 Client ID: B-24 0-6 Laboratory ID: 08-217-16 Arsenic 23 2.7 EPA 6010D 8-28-23 8-28-23 Lead 21 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-24 6-12 Laboratory ID: 08-217-17 Arsenic 5.9 2.7 EPA 6010D 8-28-23 8-28-23 Lead ND 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: B-25 0-6 Laboratory ID: 08-217-18 Arsenic 15 2.6 EPA 6010D 8-28-23 8-28-23 Lead ND 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: B-26 0-6 Laboratory ID: 08-217-19 Arsenic 15 2.6 EPA 6010D 8-28-23 8-28-23 Lead 17 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: B-27 0-6 Laboratory ID: 08-217-20 Arsenic 4.6 2.6 EPA 6010D 8-28-23 8-28-23 Lead 5.6 5.2 EPA 6010D 8-28-23 8-28-23 Client ID: B-28 0-6 Laboratory ID: 08-217-21 Arsenic 13 2.7 EPA 6010D 8-28-23 8-28-23 Lead 34 5.4 EPA 6010D 8-28-23 8-28-23 6 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: B-28 6-12 Laboratory ID: 08-217-22 Arsenic 4.7 2.6 EPA 6010D 8-28-23 8-28-23 Lead ND 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: B-29 0-6 Laboratory ID: 08-217-23 Arsenic 11 2.7 EPA 6010D 8-28-23 8-28-23 Lead 16 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-30 0-6 Laboratory ID: 08-217-24 Arsenic 100 2.9 EPA 6010D 8-28-23 8-28-23 Lead 180 5.8 EPA 6010D 8-28-23 8-28-23 Client ID: B-31 0-6 Laboratory ID: 08-217-25 Arsenic 27 2.7 EPA 6010D 8-28-23 8-28-23 Lead 27 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-32 0-6 Laboratory ID: 08-217-26 Arsenic 17 2.7 EPA 6010D 8-28-23 8-28-23 Lead 35 5.4 EPA 6010D 8-28-23 8-28-23 Client ID: B-32 6-12 Laboratory ID: 08-217-27 Arsenic 6.6 2.6 EPA 6010D 8-28-23 8-28-23 Lead 6.4 5.3 EPA 6010D 8-28-23 8-28-23 Client ID: Duff A-1 Laboratory ID: 08-217-28 Arsenic ND 2.9 EPA 6010D 8-28-23 8-28-23 Lead ND 5.7 EPA 6010D 8-28-23 8-28-23 7 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 TOTAL METALS EPA 6010D Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: Duff A-2 Laboratory ID: 08-217-29 Arsenic 4.2 2.8 EPA 6010D 8-28-23 8-28-23 Lead 11 5.6 EPA 6010D 8-28-23 8-28-23 Client ID: Duff B-1 Laboratory ID: 08-217-30 Arsenic 9.5 2.8 EPA 6010D 8-28-23 8-28-23 Lead 44 5.6 EPA 6010D 8-28-23 8-28-23 Client ID: Duff B-2 Laboratory ID: 08-217-31 Arsenic ND 3.1 EPA 6010D 8-28-23 8-28-23 Lead ND 6.1 EPA 6010D 8-28-23 8-28-23 Client ID: Duff B-3 Laboratory ID: 08-217-32 Arsenic 15 2.9 EPA 6010D 8-28-23 8-28-23 Lead 43 5.9 EPA 6010D 8-28-23 8-28-23 Client ID: Duff B-4 Laboratory ID: 08-217-33 Arsenic 15 2.7 EPA 6010D 8-28-23 8-28-23 Lead 30 5.4 EPA 6010D 8-28-23 8-28-23 8 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 TOTAL METALS EPA 6010D QUALITY CONTROL Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0828SM2 Arsenic ND 2.5 EPA 6010D 8-28-23 8-28-23 Lead ND 5.0 EPA 6010D 8-28-23 8-28-23 Laboratory ID: MB0828SM3 Arsenic ND 2.5 EPA 6010D 8-28-23 8-28-23 Lead ND 5.0 EPA 6010D 8-28-23 8-28-23 Matrix: Soil Units: mg/Kg (ppm) Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 08-217-01 ORIG DUP Arsenic 24.1 23.0 NA NA NA NA 5 20 Lead 41.3 48.9 NA NA NA NA 17 20 Laboratory ID: 08-217-21 ORIG DUP Arsenic 12.5 11.9 NA NA NA NA 5 20 Lead 31.7 33.2 NA NA NA NA 5 20 MATRIX SPIKES Laboratory ID: 08-217-01 MS MSD MS MSD MS MSD Arsenic 119 125 100 100 24.1 95 101 75-125 5 20 Lead 286 293 250 250 41.3 98 101 75-125 2 20 Laboratory ID: 08-217-21 MS MSD MS MSD MS MSD Arsenic 111 113 100 100 12.5 99 101 75-125 2 20 Lead 282 287 250 250 31.7 100 102 75-125 2 20 9 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 % MOISTURE Date Client ID Lab ID % Moisture Analyzed B-12 0-6 08-217-01 8 8-28-23 B-12 6-12 08-217-02 8 8-28-23 B-13 0-6 08-217-03 9 8-28-23 B-14 0-6 08-217-04 12 8-28-23 B-15 0-6 08-217-05 8 8-28-23 B-16 0-6 08-217-06 11 8-28-23 B-16 6-12 08-217-07 9 8-28-23 B-17 0-6 08-217-08 10 8-28-23 B-18 0-6 08-217-09 8 8-28-23 B-19 0-6 08-217-10 3 8-28-23 B-20 0-6 08-217-11 6 8-28-23 B-20 6-12 08-217-12 6 8-28-23 B-21 0-6 08-217-13 8 8-28-23 B-22 0-6 08-217-14 8 8-28-23 B-23 0-6 08-217-15 10 8-28-23 B-24 0-6 08-217-16 7 8-28-23 B-24 6-12 08-217-17 6 8-28-23 B-25 0-6 08-217-18 5 8-28-23 B-26 0-6 08-217-19 5 8-28-23 B-27 0-6 08-217-20 3 8-28-23 B-28 0-6 08-217-21 8 8-28-23 B-28 6-12 08-217-22 5 8-28-23 B-29 0-6 08-217-23 7 8-28-23 B-30 0-6 08-217-24 14 8-28-23 B-31 0-6 08-217-25 8 8-28-23 B-32 0-6 08-217-26 7 8-28-23 B-32 6-12 08-217-27 5 8-28-23 10 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: August 29, 2023 Samples Submitted: August 18, 2023 Laboratory Reference: 2308-217 Project: 8926 % MOISTURE Date Client ID Lab ID % Moisture Analyzed Duff A-1 08-217-28 12 8-28-23 Duff A-2 08-217-29 11 8-28-23 Duff B-1 08-217-30 11 8-28-23 Duff B-2 08-217-31 18 8-28-23 Duff B-3 08-217-32 15 8-28-23 Duff B-4 08-217-33 8 8-28-23 11 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical ____________. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1 - Sample extract treated with a sulfuric acid/silica gel cleanup procedure. X2 - Sample extract treated with a silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in methods 8260 & 8270, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Y1 - Negative effects of the matrix from this sample on the instrument caused values for this analyte in the bracketing continuing calibration verification standard (CCVs) to be outside of 20% acceptance criteria. Because of this, quantitation limits and sample concentrations should be considered estimates. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference I_ OnSHe Environmental Inc Analytical Laboratory Testing Services 14648 NE 95th Street • Redmond, WA 98052 Phone: (425) 883-3881 • www.onsite-env.com Company: / ,=;OQ.4" -Ac:...,o,--rA-:r--r:::::7 Project Number: � 9 � Project Name: Project A)�� t-\-oi= FAA A..� Sampled /\A I\')( °fi<.J:Ct Lab ID Samole Identification I �.:.. rz (9-� "2, '&-12 (o-/7_ 3 13-13 0-b l..} B-1�0-bs J3-,� 0-6 (;, (3-/'=, t>-b 7 i-/'1 fJ-rz.,, i \3-17 0-0'1 'B-18 0 -C.. \0 i-,� 0 -c. Signature _ ., � Lt:_IT,liC) "" Relinquished �A,1/./l__ Received C. 7¥,.__ Relinquished Received Relinquished Received Reviewed/Date Chain of Custody Page __L_ of -1 Turnaround Request Laboratory Number: 'n A -, 1 7(in working days) (Check One) D Same Day 0 1 Day D 2 Days D 3 Days � Standard r, Days) t! C ! □ C "' c.) 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