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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209)384-2930 <br /> Certificate 42480 Fax: (209)384-1507 <br /> Shop Hazard Solutions, Inc. Client Project Name: SJ Method: EPA 5030/8021B <br /> P.O. Box 798 Lab Reference Number:2007012 Instrument ID:VAR-GC1 <br /> Turlock, CA 95381 Sample Description: Soil Extracted: 07-06-20 <br /> Attn: Steve Meier Analyzed: 07-06-20 <br /> Reported: 07-07-20 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethylbenzene Total Xylenes <br /> Spike Concentration: 32.3 152 37.5 230 <br /> Units: ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch#: VS-7060 VS-7060 VS-7060 VS-7060 <br /> LCS %Recovery: 128% 112% 136% 118% <br /> Surrogate Recovery: 88.5% 88.5% 88.5% 88.5% <br /> Control Limits: 70-130% 70-130% 70-130% 70-130% <br /> LCSA/LCSB Batch#: VS-7060 VS-7060 VS-7060 VS-7060 <br /> LCSA%Recovery: 128% 114% 136% 120% <br /> Surrogate Recovery: 84.9% 84.9% 84.9% 84.9% <br /> LCSB%Recovery: 125% 114% 135% 119% <br /> Surrogate Recovery: 86.8% 86.8% 86.8% 86.8% <br /> Relative%Difference: 2.2% 0.11% 0.19% 0.17% <br /> Method Blank: ND ND ND ND <br /> Surrogate Recovery: 96.0% 96.0% 96.0% 96.0% <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 /> Clavi J. Cone/Larnney <br /> ry trector <br /> Cassandra J.A. N /Chemist <br />