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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 4327 Instrument ID Var-GC1 <br /> 837 Shaw Read Sample Description Water Prepared 1-03-02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 1-03-02 <br /> Attn Tim Cuellar Reported 1-14-02 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 2 10 1 32 7 94 1 84 922 <br /> Units uglL ug/L ug/L ug/L uglL ug/L <br />' LCS Batch# VW-1032 VW-1032 VW-1032 VW-1032 VW-1032 VW-1032 <br /> 110% 130% 119% 109% 113% 110% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-1032 VW-1032 VW-1032 VW-1032 VW-1032 VW-1032 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS%Recovery 957% 118% 112% 109% 114% 110% <br /> Surrogate Recovery 105% 103% 103% 103% 103% 103% <br /> MSD%Recovery 965% 116% 115% 109% 116% 112° <br />' Surrogate Recovery 107% 104% 104% 104% 104% 104% <br /> Relative%Difference 0806% 180% 205% 0118% 1 87% 196% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 985% 100% 100% 100% 100% 100% <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 batch results Due to matrix effects,the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> UIAANALYST APPROVED BY <br /> Clan—J'Cone J es C Phrllrps <br /> Laboratory arrector <br />