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I <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 6020 <br /> I of Northern California Reference Number 4805 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 06-25-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 06-25-02 <br /> Attn Tim Cuellar Reported 07-08-02 <br /> IQUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoltne 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 ug/L ug/L <br /> LCS Batch# VW-6252 VW-6252 VW-6252 VW-6252 VW-6252 VW-6252 <br />' LCS%Recovery 955% 122% 109% 950% 971% 946% <br /> Surrogate Recovery 111% 107% 107% 107% 107% 107% <br />�. Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> I MS/MSD Batch# VW-6252 VW-6252 VW-6252 VW-6252 VW-6252 VW-6252 <br /> Spike Concentration 110 2 10 132 7 94 1 84 922 <br /> I MS%Recovery 993% 125% 103% 880% 895% 875% <br /> Surrogate Recovery 102% 994% 994% 994% 994% 994% <br /> MSD% Recovery 959% 110% 929% 841% 849% 833% <br /> Surrogate Recovery 104% 102% 102% 102% 102% 102% <br /> Relative%Difference 333% 11 8% 995% 460% 513% 488% <br /> Methanol Blank NO NO NO ND NO NO <br /> Surrogate Recovery 995% 997% 997% 997% 997% 997% <br /> The LCS(LaboratoryCheck Sample) is a control sample of known interferent free matrix that is fortified with representative analytes and <br /> P ) P P Yt <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 /> E� <br /> ANALYST PPROVED BY <br /> Clan J Cane ;JamPhillips <br /> oratory irecto <br /> Director <br />