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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209)384-2930 <br />' Certificate#2480 Fax (209)3841507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Top Filling Station Method EPA 503018015M 8020 <br /> of Northern California Reference Number 5924 Instrument ID Var-GC1 <br />' 837 Shaw Road Matrix Soil Extracted 07-25-03 <br /> Stockton, CA 95215 Analyst Clan Cone Analyzed 07-25-03 <br /> Attn Tim Cuellar Reported 08-18-03 <br />' QUALITY CONTROL DATA REPORT <br /> rANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 220 42 0 26 4 159 36 8 184 <br /> Units mg/kg ug/kg uglkg ug/kg ug/kg uglkg <br />' LCS Batch# VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 <br /> LCS % Recovery 9,, l-/. 109% 111% 9619/. 102% 11110/b <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# VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 <br /> MS %Recovery 790% 110% 845% 863% 901% 905% <br /> Surrogate Recovery 922% 936% 936% 936% 936% 936% <br /> MSD% Recovery 794% 105% 939% 852% 891% 892% <br />' Surrogate Recovery 906% 91 0% 91 0% 910% 91 0% 910% <br /> Relative%Difference 0468% 520% 104% 1 18% 1 14% 148% <br />' Methanol Blank NO NO ND ND ND ND <br /> Surrogate Recovery 939% 963% 963% 963% 963% 963% <br />' Please Note <br /> The LCS(Laboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative anatytes 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 /> r. <br /> ANALYST "� APPROVED BY <br /> Clan one Ia Jam C Phillips <br /> ,E i onmental Lab Director <br />