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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 Project ID Pacific Pride-El Dorado Method EPA 503018015M,8020 <br /> ' of Northern California Reference Number 3058 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 6-19-00 <br /> Stockton,CA 95205 Analyst Jim Phillips Analyzed 6-19-00 <br /> Attn Tim Cuellar Reported 6-28-00 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 212 1 34 712 1 84 141 <br /> tUnits uglL uglL ug/L uglL uglL uglL <br /> LCS Batch# VW-6190 VW-6190 VW-6190 VW-6190 VW-6190 VW-6190 <br /> ' LCS %Recovery 853% 979% 82 1% 854% 927% 878% <br /> Surrogate Recovery 102% 112% 112% 112% 112% 112% <br /> '. Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70 130% <br /> MS/MSD Batch# VW-6190 VW 6190 VW-6190 VW-6190 VW-6190 VW-6190 <br /> Spike Concentration 110 222 1 34 782 184 948 <br /> ' MS%Recovery 657% 654% 545% 789% 879% 842% <br /> Surrogate Recovery 107% 109% 109% 109% 109% 109% <br /> MSD% Recovery 642% 777% 579% 795% 880% 838% <br /> ' Surrogate Recovery 107% 109% 109% 109% 309% 109% <br /> Relative%Difference 1 75% 172% 552% 0648% 0153% 0504% <br /> ' Methanol Blank ND ND NO ND ND ND <br /> Surrogate Recovery 111% 103% 103% 103% 103% 103% <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 accept or <br /> ' reject batch results <br /> ANALYST �2— APPROVED BY <br /> ' Clan J Cone J e Phillips <br /> nvrronmental Lab Director <br /> 1 i <br />