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i <br /> i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone 1209) 384-2930 <br /> Certificate #2079 Fax 1209) 384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Sampled 4-26-96 <br /> I of Northern California Reference Number 742 Received 4-30 96 <br /> 1803 West March Lane, Suite A Sample Description Water Extracted 4-30-96 <br /> Stockton, CA 95207 Sample Prep/Analysis Method 8015M, 8020 Analyzed 4-30-96 <br /> Attn Tim Cuellar Lab Numbers 742 Reported 5-6 96 <br /> TOTAL PETROLEUM HYDROCARBONS - GASOLINE RANGE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW-11 MW-21 MW-31 MW 41 MW-5/ <br /> 426-96 426-96 4-2696 4-26-96 4-26-96 <br /> [ug/L) (ug/L) Jug/L) (ug/L) 1ugIL) Jug/L) <br /> I MTBE 050 ND 58 ND 053 ND <br /> BENZENE 050 ND 83 2 7 2 8 2000 <br /> TOLUENE 0 ,90 ND 1 3 ND ND ND <br /> ETHYL BENZENE 0 50 ND 20 074 ND 1000 <br /> I TOTAL XYLENES 0 50 ND 5 2 062 ND 470 <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND 860 150 ND 13000 <br /> Report Limit Multiplication Factor 1 2 5 1 1 50 <br /> I <br /> Surrogate % Recovery F10 91 7%1 P10-90 3% FID 89 7%1 PID 93 3% FID 92 0%f PID 97 8% FID 104%1 P10 104% FID-93 2%f PID 97 0% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR GC1 VAR-GC1 VAR-GC1 <br /> Practical Quantitation limit = Reporting Limit x Report Limit Multiplication Factor <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> ANALYST APPROVED BY <br /> J Cone es C Phillips <br /> Envirormental Lab D-ecrc- <br />