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A TLE ANALYTICAL C S A CAL LABORATORY <br /> ' Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> ' Advanced GeoEnvironmental Inc Client Project ID Rainwater Car Wash Method EPA 503018015M 8020 <br /> of Northern California Reference Number 7092(1-20) Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 06-25-04 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 06-25-04 <br /> ' Attn Tim Cuellar Reported 07-07-04 <br /> I <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration 110 210 1 32 794 1 84 922 <br /> Units ug/L ug/L ug/L ugIL ug/L uglL <br /> ' LCS Batch# VW-6254 VW-6254 VW-6254 VW-6254 VW-6254 VW-6254 <br /> LCS %Recovery 993% 113% 103% 974% 103% 100% <br /> Surrogate Recovery 103% 999% 999% 999% 999% 999% <br /> tControl Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> ' MSIMSD Batch# VW-6254 VW-6254 VW-6254 VW-6254 VW-6254 VW-6254 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> ' MS%Recovery 942% 986% 974% 968% 101% 100% <br /> Surrogate Recovery 102% 103% 103% 103% 103% 103% <br /> MSD%Recovery 952% 111% 103% 100% 106% 105% <br /> ' Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> Relative%Difference 0930% 114% 578% 363% 538% 484% <br /> ' Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 91 5% 925% 925% 925% 925% 925% <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 /> reject batch results <br /> ' APPROVED BY APPROVED BY <br /> Clan J one Ja s C hrllrps <br /> Laboratory Ma ager L oratory Director <br />