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. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> ' Advanced GeoEnWonmental, Inc Client Project ID Rainwater Car Wash Method EPA 503018015M,W20 <br /> of Northern Calrfomia Reference Number 5220(31-36) Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 11-16-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 11-16-02 <br /> ' Attn Tim Cuellar Reported 11-26-02 <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 ug1L uglL uglL uglL ug1L <br /> ' LCS Batch# VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 <br /> LCS% Recovery 116% 126% 132% 115% 109% 103% <br /> Surrogate Recovery 102% 996% 996% 996% 996% 996% <br /> ' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> ' MSIMSD Batch# VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 VW-N162 HP2 <br /> Spike Concentration 110 210 1 32 7 94 184 922 <br /> ' MS%Recovery 112% 110% 108% 963% 103% 976% <br /> Surrogate Recovery 108% 103% 103% 103% 103% 103% <br /> MSD% Recovery 902% 115% 111% 985% 984% 903% <br /> Surrogate Recovery 967% 945% 945% 945% 945% 945% <br /> Relative%Difference 215% 453% 274% 219% 439% 765% <br /> ' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 974% 972% 972% 972% 972% 972% <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> t <br /> ' n <br /> f <br /> r <br /> ANALYST APPROVED BY <br /> Clan J Cone Jams Phrllrps <br /> I , t <br /> Lahbratoty Director <br /> f I I I <br /> , 1 <br /> I ` <br />