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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 Project ID Rainwater Car Wash Sampled 08-05-02 <br /> ' of Northern California Reference Number 4951 Received 08-07-02 <br /> 837 Shaw Road Sample Description Water Extracted 08-17-02 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8015 8020 Analyzed 08-17-02 <br /> Attn Tim Cuellar Lab Numbers 4951-1W, 2W, 3W Reported 08-21-02 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> ' WITH BTEX DISTINCTION <br /> ' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID <br /> Influent GAC-2 Effluent <br /> (ug/L.) (ug1L) (ug/L) (ug/L) <br /> ' MTBE 050 14000 ND ND <br /> BENZENE 050 690 ND ND <br /> ' TOLUENE 050 160 ND ND <br /> ETHYL BENZENE 050 63 ND ND <br /> ' TOTAL XYLENES 050 1100 ND ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 8100 ND ND <br /> ' <br /> Report Limit Multiplication Factor 20 1 1 <br /> � <br /> Report Limit Mulhplication Factor for MTBE only 500 <br /> ' Surrogate%Recovery Flo 117%/PD 111% FID 898%/PID 897% FID 895%1 PID 893% <br /> Instrument ID 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 .- "Y , - APPROVED BY <br /> Clan J Cone J e PhrlGps <br /> aboratory Duector I <br />