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' CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 Certificate#2480 Fax (209)384-1507 Advanced GeoEnvironmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030/8015M,8020 of Northern California Reference Number 4951 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 08-17-02 Stockton CA 95215 Analyst Jim Phillips Analyzed 08-17-02 Attn Tim Cuellar Reported 08-21-02 1 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 110 210 132 794 1 84 122 ' Units ug/L uglL ug/L ug/L ug/L. uglL LCS Batch# VW-8172 VW-8172 VW-8172 VW-8172 VW-8172 VW-8172 LCS %Recovery 954% 145% 114% 907% 884% 862% Surrogate Recovery 932% 90 1% 901% 901% 901% 901% ' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130 % ' MS/MSD Batch# VW-8172 VW-8172 VW-8172 VW-8172 VW-8172 VW-8172 Spike Concentration 110 210 132 794 184 922 MS %Recovery 105% 162% 116% 918% 908% 893% Surrogate Recovery 950% 929% 929% 929% 929% 929% MSD%Recovery 106% 138% 116% 903% 901% 872% ' Surrogate Recovery 957% 929% 929% 9292% 929% 929% Relative%Difference 0970% 162% 0352% 159% 0768% 232% ' Methanol Blank ND ND ND ND NO ND Surrogate Recovery 892% 915% 915% 915% 915% 915% The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative P P 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or reject batch results i ANALYST APPROVED BY CIa J Cone Ja s C Phillips boratory Director