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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OFANALYSIS <br /> Tuesday,June 15, 2004 <br /> Attention Rita Koehnen <br /> Port Of Stockton Report Page 11 of 14 <br /> P O Sox 2089 <br /> Stockton, CA 95209-2089 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sample Information <br /> Sample ID Trip Blank Sample Type Grab <br /> Laboratory ID 0401800-06 Project Name Port of Stockton UST Site No 3 <br /> Date,/Time Sampled 21-May-04 09 50 by Jim Neal Sample Matrix Ground Water-Non Potable <br /> IZI-1parameter Result ALR Unit Dilution Batch Prepared Analysts Date Method Notes <br /> Benzene 0 750 0 500 ug/1 1 AF41501 27-May-04 28-May-04 EPA 8260E <br /> Ethylbenzene NO 0 500 ug/1 1 AF41501 27-May 04 28-May-04 EPA 8260E <br /> Toluene ND 0 500 ug/1 1 AF41501 27 May-04 28-May-04 EPA 82608 <br /> m,p-xyiene ND 0 500 ug/) 1 AF41501 27-May-04 28-May-04 EPA 8260E <br /> o-Xylene ND 0 500 ugtl 1 AF41501 27-May-04 28-May-04 EPA 8260B <br /> Surrogate 4-Brom0fluorobenzene 96% 86-115 <br /> mg1L-milligrams per Laer-ppm DLR=Detection Limit for Purpose of Reporting <br /> ug i-m rcrograms per Luer-ppb Exceptional sample matrices or interferences may <br /> result to higher detection limits <br /> WECTFULLY SUBMITTED, <br /> Jonathan Le, Laboratory D1Tector <br /> 7713 N Woct Tnnp 1'7rrtp R7 C'tnok-tnn CA Qi?ln nhnrnp 00Q) 177_R1n5 Frry 000) J77-RI-IR <br />