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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 /> BSK Analytical Laboratories Client Project ID:A91-11897 Method: EPA 80158 <br /> 1414 Stanislaus St. Lab Reference Number: 1908057 Instrument ID: HP-Diesel <br /> Fresno,CA 93706 Sample Description:Soil Extracted:08-21-19 <br /> Attn:Adam Trevarrow Analyzed: 08-22-19 <br /> Reported:08-23-19 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration: 5.00 <br /> Units: mg/kg <br /> Batch#: TPHDS-8219 <br /> Method Blank: ND <br /> Surrogate%Recovery: 97.7% <br /> LCS%Recovery: 95.6% <br /> Surrogate%Recovery: 83.0% <br /> Control Limits: 60-130% <br /> MS/MSD Batch#: TPHDS-8219 <br /> MS%Recovery: 80.1% <br /> Surrogate%Recovery: 84.9% <br /> MSD%Recovery: 943% <br /> Surrogate%Recovery. 108% <br /> Relative%Difference: 14.8% <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 /> 1 <br /> APPROVED BY: <br /> Clad J. Cone/Labo tory Director or <br /> Cassandra J.A. Na ney/Chemist <br /> Page 15 of 16 <br />