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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone f209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced Geo Env iron mental, Inc Client Project ID Pacific Car Wash Method EPA 5030/801 5M,8020 <br /> I of Northern California Reference Number 2402 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 8 5-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 8 5-99 <br /> Ann Tim Cuellar Reported 8 1099 <br /> IQUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> I Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> Units uglL uglL uglL ug/L ug/L ug/L <br /> LCS Batch # VW-8059 VW-8059 VW-8059 VW-8059 VW-6059 VW 8059 <br /> LCS % Recovery 112% 620% 114% 107% 109% 987% <br /> Surrogate Recovery 105% 103% 103% 103% 103% 103% <br /> Control Limits 70 130 % 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> IMS/MSD Batch # VW-8059 VW-8059 VW-8059 VW-8059 VW-8059 VW 8059 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> MS % Recovery 113% 105% 180% 105% 103% 937% <br /> Surrogate Recovery 103% 100% 100% 100% 100% 100% <br /> MSD % Recovery 117% 104% 128% 103% 103% 94 7% <br /> Surrogate Recovery 103% 101% 101% 1010/0 101% 101% <br /> Relative % Difference 3 10% 1 12% 341% 1 11% 0306% 1 08% <br /> IMethanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 98 1% 986% 98 6% 986% 986% 986% <br /> IThe LCS (Laboratory Check Sampleâ–º 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 MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST APPROVED BY <br /> Clary J one Jame C f Gps <br /> rwrronmenral Lab Duector <br />