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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95309 Phone (209)384-2930 <br />' Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Pacific Car Wash Sampled 3-27-01 <br /> of Northern California Reference Number 3639 Received 3-26-01 <br /> 837 Shaw Road Sample Description Water Extracted 4-2-01 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 4-2-01 <br /> Attn Tim Cuellar Lab Numbers 3639-1W,2W, 3W,4W, 5W Reported 4-6-01 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW9 MW2 MW3 MW4 MW5 <br /> 3-27-01 3-27-01 3-27-01 3-27-01 3-27-01 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 540 ND ND ND ND <br /> BENZENE 050 8900 210 460 ND ND <br /> ITOLUENE 050 1200 1300 200 ND ND <br /> ETHYL BENZENE 050 680 2900 770 ND ND <br /> TOTAL XYLENES 050 3700 16000 2000 ND ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 54000 90000 16000 ND ND <br /> Report Limit Multiplication Factor 500 200 100 1 1 <br /> Surrogate% Recovery FID 91 3%1 PID SODA Fla 103%1 PID 955% FID 941%/PID 909°6 f1D 90 0%1 PID 9091A FID 87 9%1 PIfl 664% <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 /> Clare J Cone mes C Phillips <br /> [Laboratory Director <br /> I <br />