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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 Sierra Lumber Sampled 12-29-03 <br />' of Northern California Reference Number 6479 Received 12-30-03 <br /> 837 Shaw Road Sample Description Water Extracted 12-31-03 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 12-31-03 <br /> Attn Tim Cuellar Lab Numbers 6479-1W, 2W 3W,4W, 5W Reported 01-06-04 <br /> 1 <br /> TOTAL PETROLEUM HYDROCARBONS-GASOLINE <br /> WITH BTEX DISTINCTION <br />' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE 30 SAMPLE ID SAMPLE ID <br /> MW 1 MW 2 MW 4A MW 48 MW 6 <br /> 12-29-03 12-29-03 12-29-03 12-29-03 12-29-03 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (uglL) (ug/L) <br /> MTBE 050 ND ND ND ND ND <br /> BENZENE 050 ND ND ND ND ND <br />' TOLUENE 050 ND ND ND ND ND <br /> ETHYL BENZENE 050 ND 420 ND ND ND <br /> TOTAL XYLENES 050 ND 1800 ND ND ND <br /> GASOLINE RANGE <br /> IHYDROCARBONS 50 ND 12000 ND ND ND <br /> IReport Limit Multiplication Factor 1 100 1 1 1 <br /> Surrogate%Recovery FID 95 4%1 PID 992% FID 105%1PID 105% FID 95 0%1 PID 982% FID 954%1 PID 978% FID 94 4%1 PID 961% <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 /> LL <br /> ANALYST APPROVED BY \-"-_ &+ <br /> Clair J Cone James C PWips <br /> Laboratory Director <br /> C <br />