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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 12091 384 2930 <br /> Certificate #2079 Fax 1209} 384 1507 <br /> Advanced GecEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 503018015M 8020 <br /> of Northern California Reference Number 2213 Instrument ID Var GC1 <br /> 4005 North Wdson Way Matrix Water Prepared 4-22-99 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 4-22-99 <br /> AM Tim Cuellar Reported 427-99 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 22 1 34 -182 1 84 9411 <br /> Units uglL ug/L uglL ug/L uglL ug1L <br /> LCS Batch # VW 4229 VW 4229 VW-4229 VW 4229 VW-4229 VW 4229 <br /> LC5 % Recovery 113% 104% 118% 103% 104% 92 5% <br /> Surrogate Recovery 966% 934% 934% 934% 934% 93 4% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70 130 % 70 130 % <br /> MSIMSD Batch # VW 4229 VW 4229 VW-4229 VW-4229 VW 4229 VW 4229 <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> MS % Recovery 936% 112% 114% 954% 97 5% 86 1% <br /> Surrogate Recovery 102% 998% 99 8% 998% 99 8% 99 8% <br /> MSD % Recovery 99 7% 123% 106% 94 7% 96 8% 85 0% <br /> Surrogate Recovery 102% 100% 100% 100% 100% 100% <br /> Relative % Difference 6 15% 922% 7 23% 0 726% 0683% 1 27% <br /> rMethanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 101% 101% 101% 101% 101% 101% <br /> The LCS ;Laboratory Check Samplel 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 OC limits and recoveries for MS/MSD s are advisory only and are not used to accept or <br /> refect batch results <br /> 7 <br /> ANALYST APPROVED BY <br /> Clary J Cone J es C Phillips <br /> environmental Lab Director <br />