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Case Narrative Client: Conestoga-Rovers&Associates, Inc. TestAmerica Job ID:440-66282-1 Project/Site:4315 Waterloo Rd.,Stockton,CA Job ID: 440-66282-1 Laboratory:TestAmerica Irvine Narrative Job Narrative Q 440-66282-1 1J Comments ❑ No additional comments. Receipt The samples were received on 12/28/2013 11:40 AM;the samples arrived in good condition,properly preserved and,where required,on ice. The temperatures of the 2 coolers at receipt time were 2.5°C and 3.7°C. r GC/MS VOA No analytical or quality issues were noted. 1 GC/MS Semi VOA Method(s)8270C LL: Insufficient sample volume was available to perform batch matrix spike/matrix spike duplicate(MS/MSD)associated F11 with batch 153726. The laboratory,control sample(LCS)was performed in duplicate to provide precision data for this batch. Method(s)8270C LL:The laboratory control sample duplicate(LCSD)for batch 153726 recovered outside control limits for di-n-octylphthalate. This analyte was biased high in the LCS and was not detected in the associated samples;therefore,the data have been reported. No other analytical or quality issues were noted. GC Semi VOA Method(s)8082:Insufficient sample volume was available to perform batch matrix spike/matrix spike duplicate(MS/MSD)associated with batch 153724. The laboratory control sample(LCS)was performed in duplicate to provide precision data for this batch.(LCS 440-153724/4-A) Method(s)8082:The continuing calibration verification(CCV)associated with batch 154299 recovered above the upper control limit for 1254 and 1016. The samples associated with this CCV were non-detects for the affected analytes;therefore,the data have been reported. The following samples are impacted:MW-6(440-66282-1). No other analytical or quality issues were noted. Metals Method(s)6020:The matrix spike/matrix spike duplicate(MS/MSD)recoveries for batch 153986 were outside control limits for Antimony. Sample matrix interference is suspected because the associated laboratory control sample(LCS)precision was within acceptance limits. No other analytical or quality issues were noted. General Chemistry Method(s)1664A:Insufficient sample volume was available to perform batch matrix spike/matrix spike duplicate(MS/MSD)associated with batch 155162. The laboratory control sample(LCS)was performed in duplicate to provide precision data for this batch. No other analytical or quality issues were noted. Organic Prep No analytical or quality issues were noted. VOA Prep No analytical or quality issues were noted. i i I i TestAmerica Irvine Page 4 of 36 1/13/2014 1