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' CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> ICertificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnviron mental Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 4974 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 08-21-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 08-21-02 <br /> Attn Tim Cuellar Reported 08-28-02 <br />' QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> Units ug/L uglL uglL ug/L uglL uglL <br /> LCS Batch# VW-8212 VW-8212 VW-8212 VW-8212 VW-8212 VW-8212 <br /> LCS% Recovery 977% 129% 101% 103% 921% 101% <br /> Surrogate Recovery 941% 102% 102% 102% 102% 102% <br /> lie Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-8212 VW-8212 VW-8212 VW-8212 VW-8212 VW-8212 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> MS% Recovery -430% 563% 389% 989% 640% 931% <br /> Surrogate Recovery 195% 127% 127% 127% 127% 127% <br /> MSD% Recovery 689% 226% 163% 951% 1212% 925% <br /> Surrogate Recovery 203% 131% 131% 131% 131% 131% <br /> Relative%Difference 189% 304% -578% 3 25% 689% 0436% <br /> Methanol Blank NO ND NO NO ND ND <br /> Surrogate Recovery 944% 976% 976% 976% 976% 976% <br /> i <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 /> I of sample batch results Due to matrix effects,the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> 1! reject batch results <br /> I ANALYST APPROVED BY <br /> Clary J Cone JaPf <br /> es Ph s <br /> 116boratoty Director <br />