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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 Cal Fuels Method EPA 503018015M,8020 <br /> of Northern California Reference Number 6143 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 09-30-03 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 09-30-03 <br /> Attn Tim Cuellar Repotted 10-08-03 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> Units ug/L ug/L ug/L ug/L ug1L ug/L <br /> LCS Batch# VW-9303 VW 9303 VW-9303 VW-9303 VW-9303 VW-9303 <br /> LCS % Recovery 91 6% 122% 102% 930% 999% 979% <br /> Surrogate Recovery 104% 103% 103% 103% 103% 103% <br /> Control Limits 70-130% 70-130% 70-130 % 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-9303 VW-9303 VW-9303 VW-9303 VW-9303 VW-9303 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> MS % Recovery NA* NA* NA* NA* NA* NA* <br /> Surrogate Recovery NA* NA* NA* NA* NA* NA* <br /> MSD % Recovery NA* NA* NA" NA* NA* NA* <br /> Surrogate Recovery NA* NA* NA* NA* NA* NA" <br /> Relative %Difference NA* NA* NA* NA* NA* NA* <br /> Methanol Blank ND ND ND ND <br /> ND ND <br /> Surrogate Recovery 100% 112% 112% 112% 112% 112% <br /> *Matnx spikes not calculated due to interferences <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/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clan Co es P r rps <br /> Laboratory Director <br />