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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209) 384-2930 <br />' Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Protect ID Nomellini Const Method EPA 503018015M 8020 <br />' of Northern California Reference Number 2972 Instrument ID Var-GCI <br /> 4005 North Wilson Way Matrix Water Prepared 4-25-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 4-25-00 <br /> Attn Tim Cuellar Reported 5-1-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> 1 <br /> Spike Concentration 110 222 1 34 "1112 1 84 9411 <br /> iUnits ug1L ug/L uglL ug/L ug/L ug/L <br /> LCS Batch# VW-4250 VW-4250 VW-4250 VW-4250 VW-4250 VW-4250 <br />' LCS % Recovery 120% 103% 889% 984% 101% 987% <br /> Surrogate Recovery 110% 113% 113% 113% 113% 113% <br /> • Control Limits <br /> 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MSlMSD Batch# VW-4250 VW-4250 VW-4250 VW-4250 VW-4250 VW-4250 <br />' Spike Concentration 110 222 1 34 782 1 84 948 <br />' % Recovery <br /> 71 9% 347% 827% 992% 103% 103% <br /> Surrogate Recovery 114% 114% 114% 114% 114% 114% <br /> MSD%Recovery 109% 479% 891% 918% 948% 91 8% <br /> Surrogate Recovery 106% 105% 105% 105% 105% 105% <br />' Relative %Difference 378% 623% 721% 757% 782% 109% <br /> ' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 980% 987% 987% 987% 987% 987% <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 MSIMSD's are advisory only and are not used to acceptor <br /> ' refect batch results <br /> Ak <br /> dt <br /> • ANALYST APPROVED BY <br /> Clair J Cone Jam Phillips <br /> E rronmental Lab Director <br />