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1 <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate #2079 Fax {209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Top Filling Sampled 9-9-98 <br />' of Northern California Reference Number 1760 Received 9-11-98 <br /> 4005 North Wilson Way Sample Description Water Extracted 9-12-98 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 5030/8015, 8020 Analyzed 9-12-98 <br /> Attn Tim Cuellar Lab Numbers 1760-1 W, 2W, 3W, 4W, 5W Reported 9-21-98 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW-1/ MW-2/ MW-31 MW-4/ MW-5/ <br /> 9-9-98 9-9-98 9-998 9-9-98 9-9-98 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) Jug/L) <br /> MTBE 050 092 ND 42 ND ND <br /> BENZENE 050 ND 140 1100 10 70 <br /> TOLUENE 050 ND ND 34 088 18 <br /> ETHYL BENZENE 050 ND 28 75 3 0 160 <br /> TOTAL XYLENES 050 ND 11 84 3 9 170 <br /> IGASOLINE RANGE <br /> HYDROCARBONS 50 ND 910 3000 74 2100 <br /> Report Limit Multiplication Factor 1 5 40 1 10 <br /> Surrogate % Recovery FIR 94 2%1 P10 95 0% FID 111%1077 104% FID 106%1 PID 102% FID 107%f PID 106% fin 121%r PID 109% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GCI VAR-GC1 VAR-GC1 <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit = Reporting Limit x Report Limit Multiplication Factor <br /> ANALYST APPROVED BY <br /> Clary J Cone J s C Phillips <br /> nvuonmental Lab Director <br />