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Pace Analytical Services,LLC laneAnalyficale 1700 Elm Street-Suite 200 Minneapolis,MN 55414 www.pacelabs.com (612)607-1700 PROJECT NARRATIVE Project: French Camp,CA Pace Project No.: 10499008 Method: EPA 8015 Modified Description: 8015 GCS THC-Diesel Client: UPRR_Arcadis Date: November 13,2019 General Information: 1 sample was analyzed for EPA 8015 Modified. All samples were received in acceptable condition with any exceptions noted below or on the chain-of custody and/or the sample condition upon receipt form(SCUR)attached at the end of this report. Hold Time: The samples were analyzed within the method required hold times with any exceptions noted below. Sample Preparation: The samples were prepared in accordance with EPA 3550 Sonication with any exceptions noted below. Initial Calibrations(including MS Tune as applicable): All criteria were within method requirements with any exceptions noted below. Continuing Calibration: All criteria were within method requirements with any exceptions noted below. Surrogates: All surrogates were within QC limits with any exceptions noted below. QC Batch:644408 S4:Surrogate recovery not evaluated against control limits due to sample dilution. •MS (Lab ID:3469421) •n-Triacontane(S) •o-Terphenyl(S) •MSD (Lab ID:3469422) •n-Triacontane(S) •o-Terphenyl(S) •SS-1 (Lab ID:10499008001) •n-Triacontane(S) •o-Terphenyl(S) Method Blank: All analytes were below the report limit in the method blank,where applicable,with any exceptions noted below. Laboratory Control Spike: All laboratory control spike compounds were within QC limits with any exceptions noted below. Matrix Spikes: All percent recoveries and relative percent differences(RPDs)were within acceptance criteria with any exceptions noted below. QC Batch:644408 A matrix spike and/or matrix spike duplicate(MS/MSD)were performed on the following sample(s): 10499008001 M6:Matrix spike and Matrix spike duplicate recovery not evaluated against control limits due to sample dilution. •MS (Lab ID:3469421) REPORT OF LABORATORY ANALYSIS This report shall not be reproduced,except in full, without the written consent of Pace Analytical Services,LLC. Page 6 of 16