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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 9of14 <br /> P O Box 2089 <br /> Stockton, CA 95201-2089 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sample Information <br /> Sample ID, MW 3-6 Sample Type Grab <br /> Laboratory ID 0401800-05 Project Name Port of Stockton UST Site No 3 <br /> Date/Time Sampled, 21-May-04 13 35 by Jim Neal Sample Matrix Ground Water-Nan Potable <br /> Test Parameter Result DLR Unit Dilution Batch Prepared Analysis Date Method Notes <br /> Benzene 411 0 500 ugh 1 AF41501 27-May-04 28-May-04 EPA 82606 <br /> Ethylbenzene 114 0 500 ugh 1 AF41501 27-May 04 28-May-04 EPA 8260B <br /> Toluene 176 0 500 ug/l _ 1 AF41501 27 May-04 28-May-04 EPA 82608 <br /> m,p-Xylene 315 0 500 ug/l 1 AF41501 27-May-04 28-May-04 EPA 8260E <br /> o-Xylene <br /> 135 0 500 ugtl 1 AP41501 27-May-04 28-May-04 EPA 82608 j <br /> Surrogate. 4-Bromofluorobenzene 92% 86-115 <br /> mgt milligrams per Liter—ppm DLR—Detection Lima for Purpose ofReponing <br /> ug L=mrcrograms per Liter=ppb L_rcepoonal sample matrices or interferences may <br /> result in higher detection limas <br /> ECTFULLY SUBMITTED, <br /> Jonathan Le, Laboratory Director <br /> 7743 N West Lane Suite B2 Stockton CA 95210 nhone (209) 477-8105 Par (209) -177-8748 <br />