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PRECISION <br /> ENVIRO-TECH <br />' Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Monday March 22, 2004 <br /> Attention Rita Koehnen <br /> Port of Stockton Report Page 6 of 8 <br />' 2201 W Washington St <br /> Stockton, CA 95203 <br /> r Volatile Organic Compounds by EPA Method 8260B <br /> Sample Information <br />' Sample ID Trip Blank Sample Type Feld Sample <br /> Laboratory ID 0400750-06 Project Name Port of Stockton UST Site No 3 <br /> Date/Time Sampled 26-Feb-04 15 15 by Jun Neal Sample Matrix Ground Water-Non Potable <br /> Test Parameter Result DLR Unit Dilution Batch Prepared Analysts Date Method Notes <br /> Benzene 7 60 1 00 ug/l 1 AC42211 01-Mar-04 01-Mar-04 EPA 8260B <br /> Ethylbenzene, ND 1 00 ugIl 1 AC42211 01-Mar-04 01-Mar-04 EPA 82608 <br /> Toluene ND 100 ugll 1 AC42211 01-Mar-04 01-Mar-04 EPA 8260B <br /> m,p-Xylene ND 100 ug/l 1 AC42211 01-Mar-04 01-Mar-04 EPA 8260B <br /> o-Xylene ND 100 ugll 1 AC42211 01-Mar-04 01-Mar-04 EPA 82608 <br /> Gasoline ND 50 0 ug/l 1 AC42211 01-Mar-04 01-Mar-04 EPA 8260B <br /> Surrogate Drbromofluoromethane �— 94% _ 86-118 <br /> ogate Toluene-0 _ _ _93% 88-110_ <br /> gate 4-Bromofluorobenzene _ 95% 86-115- <br />' <br /> 71,1 n71111grams per 1 ticr-ppm D1 R-Detection!inrit forPurposc of Reporting <br /> ug L micrograms per 1 rtcr=pph Fxcepnonal sample matrices or tnrerfcrcnccs may <br /> result to hrghcrdcrcelion limits <br />,ODPECTFULLY SUBMITTED, <br />'Jonathan Le,Laboratory Director <br /> 7743 N Wert Lune Suite B2 Stockton CA 95210 Phone (209) 477-8105 Fax (209) 477-8148 <br />