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CASTLE ANALYTICAL LABORATORY <br />Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 <br />Certificate #2480 <br /> <br />Phone: (209) 384-2930 <br />Fax: (209) 384-1507 <br />Shop Hazard Solutions, Inc. <br />P.O. Box 798 <br />Turlock, CA 95381 <br />Attn: Steve Meier <br />Client Project Name: GM Expressa <br />Lab Reference Number: 2007014 <br />Sample Description: Soil <br />Method: EPA 5030/8021B <br />Instrument ID: VAR-GC1 <br />Extracted: 07-06-20 <br />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 />Clan J. Cone / La o atory Director <br />Cassandra J.A. anney/ Chemist