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' CASTLE ANALYTICAL LAB <br /> i ORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater CA 95301 Phone (209) 384-2930 <br /> Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 503018015M 8020 <br />' of Northern California Reference Number 1151 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Sod Prepared 6-19-97 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 6-1997 <br /> Attn Tim Cuellar Reported 6-2497 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Xylenes <br />' Spike Concentration 200 200 200 200 200 400 <br />' Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG 6197 VB-6197 VB 6197 VB-6197 VB 6197 VB-6197 <br />' LCS % Recovery 101% 107% 102% 107% 976% 101% <br /> Surrogate Recovery 115% 110% 110% 110% 110% 110% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % <br /> MS/MSD Batch # VG-6197 VB 6197 VB-6197 VB-6197 VB-6197 VS-6197 <br /> MS % Recovery 55 0% 89 1% 81 7% 834% 738% 737% <br /> Surrogate Recovery 81 1% 86 1% 86 1% 86 1% 86 1% 66 1% <br /> MSD % Recovery 56 7% 800% 75 1% 69 8% 71 6% 697% <br /> Surrogate Recovery 809% 849% 849% 849% 849% 849% <br /> Relative % Difference 2 89% 108% B 48% 15 4% 2 98% 5 10% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 110% 109% 109% 109% 109% 109% <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 accent or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> an J Cane J es C Phrdrps <br /> • Environmental Lab Director <br /> I <br />