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i <br /> I CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate 112079 Fax (209) 384-1507 <br /> Advanced G eo Environmental, Inc Client Protect 1D Nomellmi Construction Sampled 8-11-98 <br /> I of Northern California Reference Number 1710 Received B-14-98 <br /> 4005 North Wilson Way Sample Description Water Extracted 8-18-98 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 8-18-98 <br /> Attn Tim Cuellar Lab Numbers 1710-1 W, 2W, 3W, 4W, 5W Reported 8-25-98 <br /> I <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> I ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW-1/ MW-2/ MW-3/ MW-4/ MW-51 <br /> 8-11-98 811-98 8-11-98 8-11 98 811-98 <br /> (ug/L) (ug/L) (ug1L) lug/LI (ug/LI lug/L1 <br /> MTBE 050 ND ND ND NO 45 <br /> IBENZENE 050 7700 9100 12000 3500 ND <br /> TOLUENE 050 1100 240 4400 ND ND <br /> ETHYL BENZENE 050 1200 770 1500 370 ND <br /> TOTAL XYLENES 050 2200 340 3800 140 ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 35000 23000 54000 14400 ND <br /> IReport Limit Multiplication Factor 200 200 500 100 1 <br /> I <br /> ISurrogate % Recovery FID 102%1 PID 97'% FID 96 0%/PSD 93 6% FID 89 b%r PID 68 3% FID 110%1 PID 98 D% FID 92 7%1 PID 92 9% <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 /> ANALYST APPROVED BY <br /> Clan J Cone es C Phillips <br /> nvrronmental Lab Director <br /> I <br />