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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #12079 Fax (209) 384 1 507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellini Sampled 2 25-98 <br /> of Northern California Reference Number 1474 Received 2-27 98 <br /> 1803 West March Lane, Suite A Sample Description Water Extracted 3-2 98 <br /> Stockton CA 95207 Sample Prep/Analysis Method EPA 5030/8015, 8020 Analyzed 3-2-98 <br /> tAlin Tim Cuellar Lab Numbers 1474-6W, 7W 8W, 9W Reported 3-6 98 <br />' TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> 1 ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW-6/ MW 71 MW-8/ MW 91 <br /> 2-25-98 2-2598 2-25 98 2-25 98 <br /> (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 ND ND ND ND <br />' BENZENE 0 50 ND 910 ND ND <br /> TOLUENE 050 NO ND NO ND <br /> ETHYL BENZENE 0 50 ND 250 ND ND <br /> TOTAL XYLENES 0 50 ND 37 ND ND <br />' GASOLINE RANGE <br /> HYDROCARBONS 50 ND 5200 ND ND <br />' Report Limit Multiplication Factor 1 20 1 1 <br /> I <br />' Surrogate % Recovery FID l02%!PID 97 7% FID 133%r PID 111% FID 100%1 PID 99 e% FID i00%f PID 99 9% <br /> Instrument 1D VAR GC1 VAR GC1 VAR-GC1 VAR-GC1 <br /> rAnalytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit = Reporting Limit x Report Limit Multiplication Factor <br /> r � <br /> ANALYST APPROVED BY <br /> Clary J Cone J es C Phillips <br /> Ehvrronmenta/Lab Director <br />