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' CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax {2091 384-1607 <br /> BSK Analytical Laboratories Client Project ID 1999120767 Method EPA 503018015M,8020 <br /> 14 1414 Stanislaus Street Client Project Name George's Service Instrument ID Var-GC1 <br /> Fresno CA 93706 Reference Number 2712 Prepared 1-1-00 <br /> Attn Client Services Matrix Water Analyzed 1-1-00 <br /> Analyst Jim Phillips Reported 1-4-00 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> iSpike Concentration 110 2 22 1 34 7 82 1 84 9 48 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> iLCS Batch # VW-1010 VW-1010 VW-1010 VW-1010 VW-1010 VW-1010 <br /> LCS % Recovery 98 5% 79 9% 65 9% 91 5% 108% 98 5% <br /> Surrogate Recovery 109% 97 8% 97 8% 978% 97 89/o 97 8% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % 70-130 <br /> iMSIMSD Batch # VW-1010 VW-1010 VW-1010 VW-1010 VW-1010 VW-1010 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br />' MS % Recovery 87 6% 202% 629% 904% 106% 97 9% <br /> Surrogate Recovery 109% 100% 100% 100% 100% 100% <br /> i MSD % Recovery 96 4% 167% 62 011/c 91 1% 106% 9113% <br /> Surrogate Recovery 110% 101% 101% 101% 101% 101% <br /> I <br /> Relative % Difference 8 99% 748% 1 41% 0767% 00149% 0431% <br /> iMethanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 97 6% 908% 908% 908% 90 80/0 908% <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 MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> 1 <br /> ' ANALYST APPROVED BY <br /> Clary J Cane Ines C Phillips <br /> oe <br /> Environmental Lab arrector <br /> i <br />