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Data Validation Checklist <br /> 1 Project Location/Project Number: Stockton / Chevron #306620 <br /> Date sampled: March 10, 2009 <br /> Method(s): EPA Modified TO-3 for TPHg, BTEX, and MTBE <br /> ' Lab/ Lab work order number: Air Toxics, LTD. / 0903245 <br /> Place a check mark (RI) in the appropriate column. If the answer is "No", describe lab's corrective action. <br /> Criteria Yes No Comments <br /> Is COC included in lab report? X <br /> ' Where the samples properly preserved? N/A <br /> Is laboratory narrative included in lab report? X <br /> Was the laboratory narrative free of any lab X See explanation below <br /> errors/discrepancies? <br /> ' Were holding times met? X <br /> Were samples received at the correct temperature (4±20C)? N/A <br /> Did laboratory analyze with methods specified on COC? X <br /> ' Were appropriate analyte detection limits achieved? X <br /> Were surrogate recoveries within allowable range? X See explanation below <br /> ' Were the laboratory Matrix Spike/Matrix Spike Duplicate N/A <br /> (MS/MSD) results within the allowable range? <br /> Were the Laboratory Control Spike/Laboratory Control Spike X <br /> Duplicate (LCS/LCSD) results within the allowable range? <br /> Blanks <br /> ' • Lab blanks: Did lab blanks have non-detect results? X <br /> Field blanks: Did trip blanks have non-detect results? N/A Trip blanks not collected <br /> ' • Field blanks: Did rinsate blanks have non-detect results? N/A Rinsate blanks not collected <br /> Duplicates <br /> ' . Lab dups: Did lab dups have results within allowable N/A <br /> range? <br /> i . Field dups: Did field dups have results within allowable N/A Field dups not collected <br /> range? <br /> ' Notes: N/A = Not Applicable <br /> Comment explanations: <br /> ' The laboratory report narrative states, "The recovery of surrogate Fluorobenzene in sample Influent was outside <br /> control limits due to high level hydrocarbon matrix interference. Data is reported as qualified." <br />