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' CASTLE ANALYTICAL LABORATORY <br /> i Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)3842930 <br />' Certificate#2480 Fax (209)3841507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels(Pacific) Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 4487 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Prepared 03-14-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 03-14-02 <br /> Attn Tim Cuellar Reported 03-22-02 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br />' ANALYTE Gasohne MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 132 7 94 1 84 922 <br />' Units ug/L ug/L ug/L uglL ugll- uglL <br /> LCS Batch# VW-3142 VW-3142 VW-3142 VW-3142 VW-3142 VW-3142 <br /> LCS% Recovery 106% 107% 110% 100% 105% 102% <br /> Surrogate Recovery 103% 100% 100% 100% 100% 100% <br />' • Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> r <br /> MS/MSD Batch# VW-3142 VW-3142 VW-3142 VW-3142 VW-3142 VW-3942 <br /> Spike Concentration 110 210 132 794 1 84 922 <br />' MS% Recovery 850% 115% 109% 968% 101% 977% <br /> Surrogate Recovery 988% 966% 966% 966% 966% 966% <br /> MSD% Recovery 902% 964% 913% 103% 108% 104% <br />' Surrogate Recovery 951% 922% 922% 922% 922% 922% <br /> Relative%Difference 539% 173% 420% 642% 687% 662% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 109% 109% 109% 109% 909% <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 /> 1 <br />' ANALYST APPROVED BY <br /> Cl/1(--� <br /> ClanZr Cone Ja es trfll►ps <br /> boratory Director <br /> I <br />