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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone 1209) 364 2930 <br /> Certificate 112079 Fax 1209) 384 1507 <br /> Advanced GeoEnvironmental Inc Client Protect ID Top Filling Sampled 12-17-97 <br /> of Northern California Reference Number 1379 Received 12 19 97 <br /> 1803 West March Lane Suite A Sample Description Water Extracted 12 23 97 <br /> Stockton CA 95207 Sample Prep/Analysis Method EPA 503018015 8020 Analyzed 12-23 97 <br /> Atin Tim Cuellar Lab Numbers 1 379 1 W, 2W, 3W, 4W 5W Reported 12 29-97 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE 1D SAMPLE 1D SAMPLE ID SAMPLE ID <br /> MW-1/12-17 97 MW-2112 17 97 MW-3112-17-9 MW-4112 17-97 MW 5112-17-97 <br /> (ug/L) (ug1L) Jug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 090 ND 52 ND ND <br /> BENZENE 0 50 2 2 25 120 ND 700 <br /> TOLUENE 0 50 e4 056 ND 071 ND <br /> ETHYL BENZENE 050 32 6 2 7 8 0 57 800 <br /> TOTAL XYLENES 0 50 96 6 2 11 2 0 1000 <br />' GASOLINE RANGE <br /> HYDROCARBONS 50 140 270 730 ND 13000 <br /> Report Limit Multiplication Factor 1 1 10 1 100 <br /> r <br /> r <br /> Surrogate % Recovery FID 1 18%1 PID 10a% FID 116%1 PIA 106% FID 123%1 PID i 11% PID 112%!PID 109% FID 11 9%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 /> r , S <br /> ANALYST it APPROVED BY <br /> Clan J Cone aures C Phrllrps i <br /> Enwronmental Lab Director <br /> 1 <br />