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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Protect ID Cal Fuels Sampled 04-04-03 <br />' of Northern California Reference Number 5632 Received 04-08-03 <br /> 837 Shaw Road Sample Description Water Extracted 04-10-03 <br /> Stockton CA 95215 Sample PreplAnalysis Method EPA 503018015,8020 Analyzed 04-10-03 <br /> Attn Tim Cuellar Lab Numbers 5632-6W 7W 8W 9W 10W Reported 04-18-03 <br /> I <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 6 MW 7 MW 8 MW 9 MW 10 <br /> 040403 040403 040403 040403 040403 <br /> (uglL) (uglL) (ug/L) (uglL) (ug1L) (uglL) <br /> MTBE 050 ND ND ND ND ND <br /> BENZENE 050 058 ND ND ND ND <br /> TOLUENE 050 ND ND ND ND ND <br /> ETHYLBENZENE 050 ND ND ND ND ND <br /> TOTAL XYLENES 050 13 ND ND ND ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 260 ND ND ND ND <br /> Report Limit Multiplication Factor 1 1 1 1 1 <br /> I <br /> Surrogate% Recovery FID 101%IPID 925% FID 967%/PID 960% RD 911%l PID 008% FID 938%1PID 941% FID 874%/PID 875% <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 />' ANALYST APPROVED BY / <br /> Clan J Cone 11 Ja es hrlrps <br /> boratory Director <br />