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I <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate #2079 Fax 12091 384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Top Filling Station Sampled 3-12-98 <br /> of Northern California Reference Number 1498 Received 3-17-98 <br /> 4005 North March Lane, Suite A Sample Description Water Extracted 3-24-98 <br /> Stockton, CA 95207 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 3-24-98 <br />' Attn Tim Cuellar Lab Numbers 1498-1 W, 2W, 3W, 4W, 5W Reported 3-25-98 <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-3/ MW-4/ MW-5/ <br />' 3-12-98 3-12-98 3-12-98 3-12-98 3-1298 <br /> (ug/L) (ug/L) (ugIL) (ug/L) lug/L) (ug/L) <br /> MTBE 050 1 2 NO 14 NO ND <br />' BENZENE 0 50 ND 120 12 NO 190 <br /> TOLUENE 050 1 0 NO NO NO 5 5 <br /> ETHYL BENZENE 050 NO 32 NO NO 260 <br /> TOTAL XYLENES 0 50 069 27 0 63 ND 230 <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND 740 60 ND 2700 <br /> Report Limit Multiplication Factor 1 5 1 1 10 <br /> Surrogate % Recovery FID 101%f PID 100% FID 113%1 PID 107% FID 104%1 PID 103% FID 99 5%1 PID 99 5% FID 104%r Pio 100% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 VAR-GCI <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 /> 0 I � <br /> ANALYST APPROVED BY <br /> l <br /> Clan J Cone J es C hirp <br /> Environmental Lab Director <br /> I <br />