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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate No.2480 Fax: (209)384-1507 <br /> Shop Hazard Solutions, Inc. Client Project Name:TSB Trucking Method:TPH-Diesel <br /> P.O. Box 798 Lab Reference Number:2010015 Instrument ID: HP-Diesel <br /> Turlock,CA 95381 Sample Description:Soil Extracted: 10-07-20 <br /> Attn:Steve Meier Analyzed: 10-08-20 <br /> Reported: 10-08-20 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration: 6.70 <br /> Units: mg/kg <br /> Batch#: TPHDS-0070 <br /> Method Blank: ND <br /> Surrogate%Recovery: 110% <br /> LCS%Recovery: 102% <br /> Surrogate%Recovery: 119% <br /> Control Limits: 60-130% <br /> MS/MSD Batch#: TPHDS-0070 <br /> MS%Recovery: 74.8% <br /> Surrogate%Recovery: 83.8% <br /> MSD%Recovery: 80.1% <br /> Surrogate%Recovery: 93.6% <br /> Relative%Difference: 6.42% <br /> Please Note: <br /> The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents,preparation and analytical methods employed for the samples. The LCS%recovery is used for validation <br /> of sample batch results. Due to matrix effects,the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> APPROVED BY: <br /> Clari J. Cone/La oratory Director <br /> Cassandra J.A. lVanney/Chemist <br />