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i ' CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 Certificate#2079 Fax (209)384-1507 Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method I=PA 503018015M,8020 of Northern California Reference Number 3639 Instrument ID Var-GC1 837 Shaw Road Matrix Water Prepared 4-2-01 Stockton CA 95215 Analyst Jim Phillips Analyzed 4-2-01 Attn Tim Cuellar Reported 4-6-01 QUALITY CONTROL DATA REPORT I ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 110 2011 1211 772 1114 924 Units uglL uglL ug/L ug/L ug/L ugIL LCS Batch# VW-4021 VW-4021 VW-4021 VW-4021 VW-4021 VW-4021 ILCS % Recovery 106% 111% 107% 958% 961% 945% Surrogate Recovery 843% 81 9% 81 9% 819% 81 9% 81 9% Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch# VW-4021 VW-4021 VW-4021 VW-4021 VW-4021 VW-4021 Spike Concentration 110 2 08 1 28 772 1 84 924 MS %Recovery 102% NAS' 105% 915% 91 9% 893% Surrogate Recovery 913% 88 1% 881% 881% 881% 881% MSD% Recovery 100% NA' 105% 914% 921% 901% Surrogate Recovery 97% 940% 940% 940% 940% 940% Relative%Difference 174% NA* 00362% 00753% 0254% 0 841% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 831% 840% 84 0% 840% 840% 840% Not calculated due to matrix interferences The LCS (Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recovery is used for validation of sample batch results Due to matrix effects the QC limits and recovenes for MS/MSD's are advisory only and are not used to accept or reject batch results f 1 ' ANALYST �l APPROVED BY C!a Cone Ja s Phillips oratory Director