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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 />' [Altn ,-dvaned GeoEnvironmental Inc Client Project ID Flame(Liquors)Mini Mart Method EPA 5030/8015M 8020 <br /> f Northern California Reference Number 6121 Instrument ID Var-GC1 <br /> 37 Shaw Road Sample Description Water Extracted 09-26-03 <br /> tockton CA 95215 Analyst Jim Phillips Analyzed 09-26-03 <br />' Tim Cuellar Reported 10-01-03 <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 ug/L ug/L ug/L ug/L ug1L uglL <br />' LCS Batch# VW-9263 VW-9263 VW-9263 VW-9263 VW-9263 VW-9263 <br /> LCS % Recovery 116% 117% 103% 91 2% 991% 963% <br /> Surrogate Recovery 973% 959% 959% 959% 959% 95 9% <br />' 0 Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MS/MSD Batch it VW-9263 VW-9263 VW-9263 VW-9263 VW-9263 VW-9263 <br /> Spike Concentration 110 2 10 1 32 7 94 1 84 922 <br />' MS% Recovery 900% 113% 102% 930% 101% 965% <br /> Surrogate Recovery 102% 101% 101% 101% 101% 101% <br /> MSD% Recovery 878% 110% 105% 965% 106% 101% <br />' Surrogate Recovery 106% 105% 105% 105% 105% 105% <br /> Relative%Difference 247% 240% 245% 366% 427% 492% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 957% 97 8% 978% 978% 978% 978% <br /> I <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 MS/MSG's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST f APPROVED BY <br /> Clan Cane Ja es C Phillips <br /> Iaboratory Director <br />