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1 <br />' CAS <br /> . TLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209) 384-1507 <br /> Advanced GeoEnwronmentai Inc Client Project ID Cal Fuels Method EPA 503018015M,8020 <br />' of Northern California Reference Number 4310 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Prepared 12-24-01 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 12-24-01 <br /> Attn Tim Cuellar Reported 01-04-02 <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 ugrL <br />' LCS Batch# VW-0241 VW-D241 VW-D241 VW-D241 VW-D241 VW-0241 <br /> 986% 106% 95 8% 98 d%a 106% 103% <br /> Surrogate Recovery 104% 100% 100% 100% 100% 100% <br /> lie Control Limits 70-130% 70-130% 70-130 % 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-0241 VW-D241 VW-D241 VW-0241 VW-0241 VW-0241 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> I MS % Recovery 96 1% 944% 875% 100% 110% 106% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> MSD% Recovery 967% 982% 947% 102% 113% 109% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> Relative% Difference 0623% 397% 793% 203% 275% 245% <br /> Methanol Blank NO NO N0 ND N0 ND <br /> Surrogate Recovery 974% 984% 984% 984% 984% 984% <br /> The LCS (Laboratory Check Samole) is a control sampfe of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analyticat methods employed for the samples The LCS% recovery is used for validation <br /> of sample batcn resufts 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 APPROVED BY <br /> Clan J Cone Jam 1Urps <br /> La ratory Director <br />