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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#1-2480 Fax (209)384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Top Filling Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 4187 instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Prepared 11-5-01 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 11-5-01 <br /> Attn Tim Cuellar Reported 11-15-01 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xyienes <br />' Spike Concentration 110 2 10 1 32 7 94 1 84 9 22 <br /> Units uglL ug/L ug/L uglL ug/L uglL <br />' LCS Batch# VW-N051 VW-NO51 VW-N051 VW-N051 VW-N051 VW-N051 <br /> 114% 979% 105% 993% 103% 100% <br />'. Surrogate Recovery 969% 94 6% 946% 946% 946% 946% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MSIMSD Batch# VW-N051 VW-NO51 VW-N051 VW-N051 VW-N051 VW-NO51 <br /> Spike Concentration 110 2 10 1 32 794 1 84 9 22 <br />' MS% Recovery 102% 959% 110% 102% 106% 103% <br /> Surrogate Recovery 975% 95 3% 953% 953% 953% 953% <br />' MSD% Recovery 969% 94 1% 105% 101% 105% 101% <br /> Surrogate Recovery 998% 965% 965% 965% 965% 965% <br /> Relative% Difference 543% 179% 453% 0772% 0890% 1 54% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 946% 955% 955% 955% 955% 955% <br />' The LCS(Laboratory Check Sample) is a control sample of known, mterferent 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 /> 1 / <br /> ANALYST APPROVED BY ' <br /> Clan J Cone e C Phrllfps <br /> Laboratory Director <br />