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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 /> Advanced GeoEnvironmental, Inc Client Project ID Cal-Fuels Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 5359 Instrument ID Var-GC1 <br /> 837 Shaw Read Sample Description Water Extracted 01-06-03 <br /> Stockton, CA 95215 Analyst .aim Phillips Analyzed 01-06-03 <br /> Attn Tim Cuellar Reported 01-10-03 <br /> tQUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-1063 VW-1063 VW-1063 VW-1063 VW-1063 VW-1063 <br /> 109% 119% 102% 963% 106% 101% <br /> Surrogate Recovery 105% 994% 994% 994% 994% 994% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VW-1063 VW-1063 VW-1063 VW-1063 VW-1063 VW-1063 <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br />' MS% Recovery 874% 930% 807% 891% 103% 984% <br /> Surrogate Recovery 103% 986% 986% 986% 986% 986% <br /> MSD% Recovery 91 2% 928% 801% 893% 102% 98 9°/a <br />' Surrogate Recovery 104% 100% 100% 100% 100% 100% <br /> Relative %Difference 414% 0195% 0744% 0202% 0264% 0500% <br /> Methanol Blank NO NO NO ND ND ND <br /> Surrogate Recovery 967% 965% 965% 965% 965% 965% <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 OC 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 /> Cl one Ja s Phdhps <br /> boratory Director <br />