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t CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 384 2930 <br /> Certificate #2079 Fax {209) 364-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Sampled 12-22-98 <br />' of Northern California Reference Number 1929 Received 12 24 98 <br /> 4005 North Wilson Way Sample Description Water Extracted 12-26-98 <br /> Stockton CA 95205 Sample Prep/Analysis Method EPA 5030/8015 8020 Analyzed 12-26-98 <br /> Attn Tim Cuellar Lab Numbers 1929-1W 2W, 3W 4W, 5W Reported 1-5-98 <br /> 1 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br />' WITH BTEX DISTINCTION <br /> t ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE 1D SAMPLE ID SAMPLE ID <br /> MW 1/ MW-2/ MW-3/ MW-4/ MW-51 <br /> 12-2298 12 22-98 1222 98 12-22-98 12-22-98 <br />' (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) Jug/L) <br /> MTBE 0 50 ND 1 4 43 ND ND <br />' BENZENE 060 0 98 14 ND ND 540 <br /> TOLUENE 050 5 3 060 ND ND ND <br /> ETHYL BENZENE 0 50 083 ND ND ND 680 <br /> TOTAL XYLENES 050 4 6 075 NO ND 420 <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND 83 ND ND 9000 <br /> Report Limit Multiplication Factor 1 1 1 1 50 <br /> Surrogate % Recovery flb 90 9%1 Pio 98 4% Flo 91 M 1 PIG 91 1% FID 108%1 PIV 107% FIO 96 2%1 PID 96 5% f7b 115%1 PID 110% <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 /> 7 � <br /> ANALYST i ( APPROVED BY <br /> Clan J Cone Ja s C Phillips <br /> nvrronmenra/Lab Director <br /> f <br />