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I <br /> 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 Project ID Top Filling Station Sampled 07-23-03 <br /> of Northern California Reference Number 5924 Received 07-25-03 <br /> 837 Shaw Road Sample Description Soil Extracted 07-25-03 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 503018015M, 8020 Analyzed 07-25-03 <br /> Attn Tim Cuellar Lab Numbers 5924-1 S,2S,3S,4S, 5S Reported 08-18-03 <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 />' EW 1 -30 EW 1 -40 EW 1 -50 EW 1 -55 MW 8 -25 <br /> (mglkg) (mg/kg) (rnglk9) (mg/kg) (mg/kg) (mg/kg) <br /> BENZENE 00050 NO 0 072 031 11 ND <br />' TOLUENE 00050 NO 031 079 0 072 ND <br /> ETHYLBENZENE 00050 NO 0 072 13 018 ND <br /> TOTAL XYLENES 00050 ND 039 68 038 ND <br />�. GASOLINE RANGE <br /> HYDROCARBONS 10 NO 56 77 52 ND <br />' Report Limit Multiplication Factor 1 1 20 2 1 <br />' Surrogate%Recovery FID 73 1%1 P10 739% FID 854%1 RD 963% NA NA FID 69 5%1 PID 737% <br /> Instrument ID VAR-GCI VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 <br />' Analytes reported as NO 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 James Phi/tips <br /> • La6 tory Director <br />