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I <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)3842930 <br /> Certificate#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 4475 Instrument 1D Var-GC1 <br /> 837 Shaw Road Sample Description Water Prepared 03-11-02 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 03-11-02 <br /> Attn Tim Cuellar Reported 03-21-02 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L. <br /> LCS Batch# VW-3112 VW-3112 VW-3112 VW-3112 VW-3192 VW-3112 <br /> LCS% Recovery 103% 128% 105% 101% 104% 104% <br /> Surrogate Recovery 103% 101% 101% 101% 101% 101% <br />' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-3112 VW-3112 VW-3112 VW-3112 VW-3112 VW-3112 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS %Recovery 771% 872% 829% 713% 747% 725% <br /> Surrogate Recovery 101% 996% 996% 996% 996% 996% <br /> MSD%Recovery 914% 147% 114% 104% 107% 103% <br /> Surrogate Recovery 106% 104% 104% 104% 104% 104% <br /> Relative%Difference 224% 450% 256% 350% 348% 320% <br /> Methanol Blank NO NO NO NO ND ND <br /> Surrogate Recovery 940% 938% 938% 938% 938% 938% <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 /> I <br /> ANALYST APPROVED BY <br /> (11-,/ <br /> Clan J Cone Jam Phillips -' <br /> IL rotary Director <br />