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CASTLE ANALYTICAL LABORATORY <br />' Environmentaf Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br />' Advanced GeoEnvironmental, Inc Client Protect ID Flame Mini Mart Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 5916 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 07-30-03 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 220 420 264 159 36 8 184 <br />' Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch# VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 <br />' LCS %Recovery 981% 109% 111% 961% 102% 100% <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% 84 5% 863% 901% 905% <br /> Surrogate Recovery 022% 936% 936% 936% 936% 936% <br />' MSD%Recovery 794% 105% 93 9% 852% 891% 892% <br /> Surrogate Recovery 906% 910% 91 0% 91 0% 910% 91 0% <br /> Relative%Difference 0468% 520% 104% 1 18% 1 14% 148% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 939% 963% 963% 963% 963% 963% <br /> I <br /> Please Note <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 /> refect batch results <br /> I <br /> ANALYST ' / APPROVED BY <br /> Clan J Cone Janfis C VIhillips <br /> E ironmental Lab Director <br />