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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate #2079 Fax 1209) 384 1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Cal Fuels Sampled 1022-98 <br /> of Northern California Reference Number 1822 Received 1027-98 <br /> 4005 North Wilson Way Sample Description Water Extracted 11-1-98 <br /> Stockton CA 95205 Sample Prep/Analysis Method EPA 5030/8015, 8020 Analyzed 11-1-98 <br /> Attn Tim Cuellar Lab Numbers 1822-11 W, 12W, 13W, 14W, 15W Reported 11-3-98 <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 11/ MW-121 AW-1 B/ AW-2B1 VW-1/ <br /> 10 22 98 10-22-98 10-22-98 10-22-98 10 22 98 <br /> (ug/L) lug/L) 1ugIL) (ug/L) {ug/L) (ug/L) <br /> MTBE 060 NO ND NO ND NO <br /> BENZENE 0 50 ND NO 1800 470 8300 <br /> lieTOLUENE 050 ND ND 1800 180 37000 <br /> ETHYL BENZENE 050 ND NO 390 93 3100 <br /> ITOTAL XYLENES 050 NO NO 4000 300 14000 <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 NO 140 29000 2000 150000 <br /> Report Limit Multiplication Factor 1 1 100 20 2000 <br /> I <br /> I <br /> 1 <br /> I <br /> Surrogate % Recovery KID 87 2%1 Plb 67 1% FIG 80 4%1 PID 7S S% FID 84 7%I PID 83 2% FID 90 S%1 PID 69 9% FID 80 0%1 PID 80 0% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 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 /> 1 <br /> Lo � <br /> I ANALYST 1 APPROVED BY <br /> Clan J Cone J es C Phillips <br /> Environmental Lab Director <br />