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i CAST LABORATORY LE ANALYTICAL LABO RY A O Environmental Testing Services 2333 Shuttle Drive, Atwater CA 95301 Phone 1209) 384-2930 Certificate #2079 Fax (209) 384-1507 I Advanced GBUEnVlrel.n.6mal Inc Client Project ID Cal Fuel s Method EPA 503018015M,8020 of Northern California Reference Number 1293 Instrument ID Var-GC1 1803 West March Lane Suite A Matrix Water Prepared 10-20-97 Stockton, CA 95207 Analyst Jim Phillips Analyzed 10-20-97 ' All., Tim Cuellar Reported 10-27-97 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 100 1 00 1 00 1 00 1 00 200 Units uglL ug/1- uglL ug/L uglL uglL LCS Batch # VG-020W VB 0207W VB-0207W VB-0207W VB 0207W VB-0207W LCS % Recovery 114% 808% 78 1% 778% 778% 787% Surrogate Recovery 100% 96 7% 96 7% 967% 967% 967% Control Limits 70-130 % 70 130 % 70-130 % 70 130 % 70-130 % 70-130 % MSIMSD Batch # VG 020W VB 0207W VB-0207W VB 0207W VB-0207W VB 0207W MS % Recovery 119% 99 4% 163% 161% 104% 159% Surrogate Recovery 104% 104% 104% 104% 104% 104% MSD % Recovery 113% 80 1% 105% 106% 876% 101% Surrogate Recovery 104% 109% 109% 109% 109% 109% Relative % Difference 5 16% 15 1% 41 9% 39 5% 166% 419% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 976% 976% 976% 97 6% 97 6% 97 6% The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation of sample batch results Due to matrix effects, the OC limits and recoveries for MSIMSD s are advisory only and are not used to accept or reject batch results ANALYST -C/�/S✓ APPROVED BY ` I Clan J Cone roes C Phillips Environmental Lab Director