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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Pacific Car Wash Sampled 8-17-00 <br /> of Northern California Reference Number 3167 Received 8-18-00 <br /> 4005 North Wilson Way Sample Descnption Water Extracted 8-24-00 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 8-24-00 <br /> Attn Tim Cuellar Lab Numbers 3157-6W, 7W, 8W,9W, 10W Reported 8-31-00 <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-10A <br /> 08-17-00 08-17-00 08-17-00 08-17-00 08-17-00 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 ND 078 32 NO NO <br /> BENZENE 050 1000 16 NO NO NO <br /> ITOLUENE 050 1500 NO NO NO NO <br /> • ETHYL BENZENE 050 644 70 NO NO ND <br /> TOTAL XYLENES 050 2800 23 NO ND NO <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 31000 190 NO NO ND <br /> Report Limit Multiplication Factor 500 1 1 1 1 <br /> ISurrogate% Recovery FID 90 2%1 PID 794% FID 97 4%1 PO 841% FIE)94 1%1 PSD 625% FID 88 8%1 PID 823% FID 879%1PID 776% <br /> Instrument ID VAR-GC1 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 /> i <br /> ry�r4 <br /> ANALYST / APPROVED BY <br /> Clan J Cone Jams C Phillips <br /> Evirarlmental Lab Director <br />