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Memorandum July 9, 2020 To: Scott Hackman Ref. No.: 11183954-95-04-7036 X From: Jeffrey Cloud/eew/677-NF Tel: 206-914-3141 cc: Brittani Jacobsen, Jesse Orth, Julie Lidstone Subject: Analytical Results and Reduced Validation of Report 10499008 Soil Sampling Union Pacific Railroad (UPRR)— November 10, 2019 Diesel Spill French Camp, California November 2019 1. Introduction This document details a reduced validation of analytical results for a soil sample collected in support of the Soil Sampling at the November 10, 2019 Diesel Spill site in French Camp, California during November 2019. The sample was submitted to Pace Analytical Services, located in Minneapolis, Minnesota.A sample collection and analysis summary is presented in Table 1. A summary of the analytical methodology is presented in Table 2. The validated analytical results are summarized in Table 3. Standard GHD report deliverables were submitted by the laboratory. The final results and supporting quality assurance/quality control (QA/QC) data were assessed. Evaluation of the data was based on information obtained from the chain of custody form, finished report forms, method blank data, recovery data from surrogate spikes, a laboratory control sample and matrix spikes. The QA/QC criteria by which these data have been assessed are outlined in the analytical method referenced in Table 2 and applicable guidance from the document entitled "USEPA Contract Laboratory Program National Functional Guidelines for Organic Data Review", United States Environmental Protection Agency (USEPA) 540 R 2016 002, September 2016. 2. Sample Holding Time and Preservation The sample holding time criteria and sample preservation requirement for the analysis are summarized in the method. The sample chain of custody document and analytical report were used to determine sample holding times. The sample was prepared and analyzed within the required holding times. All sample containers were properly preserved, delivered on ice and stored by the laboratory at the required temperature (0-6°C). GHD .o ...,..... 4550 Kruse Way Suite 300 Lake Oswego OR 97035 USA ISO 9001 T971 925 3756 W www.ghd.com CvGA t —-151