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1 <br /> 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 GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 4691 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Prepared 05-15-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 05-15-02 <br /> Attn Tim Cuellar Reported 05-28-02 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 2 10 1 32 794 1 84 9 22 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch# VW-5152 VW-5152 VW-5152 VW-5152 VW-5152 VW-5152 <br /> LCS% Recovery 119% 116% 107% 849% 842% 846% <br /> Surrogate Recovery 100% 100% 100% 100% 100% 100% <br /> Control Limas 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-5152 VW-5152 VW-5152 VW-5152 VW-5152 VW-5152 <br /> Spike Concentration 110 2 10 1 32 794 184 922 <br /> MS%Recovery 963% 161% 119% 906% 909% 898% <br /> Surrogate Recovery 987% 97 1% 971% 971% 971% 971% <br /> MSD% Recovery 105% 141% 115% 870% 883% 878% <br /> ISurrogate Recovery 973% 967% 967% 967% 967% 967% <br /> Relative%Difference 822% 748% 333% 402% 289% 216% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 888% 102% 102% 102% 102% 102% <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 oatcn results Due to matrix eftects,the OL limits and recoveries for MSIMSD s are advisory only and are not used to accept or <br /> reject batch results <br /> • <br /> ANALYST APPROVED BY CIA <br /> Clan J ConeJam rlllps <br /> La story Director <br />