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i CASTLE ANALYTICAL LABORATORY ' Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 Certificate#2480 Fax (209)384-1507 ' Advanced GeoEnvaronmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030/8015M 8020 of Northern California Reference Number 5220(11-30) Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 11-16-02 Stockton,CA 95215 Analyst Jim Phillips Analyzed 11-16-02 ' Attn Tim Cuellar Reported 11-26-02 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration 110 210 1 32 7 94 1 84 922 Units ug/L ug1L uglL ug/L uglL uglL ' LCS Batch# VW-N162 VW-N162 WV-N162 VW-N162 VW-N162 VW-N162 LCS%Recovery 103% 996% 104% 959% 995% 977% Surrogate Recovery 103% 100% 100% 100% 100% 100% '. Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch# VW-N162 VW-N162 VW-N162 VW-N162 VW-N162 VW-N162 Spike Concentration 110 210 1 32 794 1 84 922 ' MS%Recovery 102% 470% 101% 973% 986% 980% Surrogate Recovery 101% 101% 101% 101% 101% 101% ' MSD% Recovery 101% 383% 101% 9313% 967% 950% Surrogate Recovery 101% 992% 992% 992% 992% 992% Relative%Difference 0 891% 11 7% 0022% 377% 1 87% 307% ' Methanol Blank ND ND ND ND ND ND Surrogate Recovery 977% 986% 986% 986% 986% 986% 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 recoveries for MSIMSD's are advisory only and are not used to accept or reject batch results ANALYST �X APPROVED BY �14i& E Clan J Cone Jams Phflhjas Lab ratory Director