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CPRECISION <br /> MPb- ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OFANALYSIS <br /> Tuesday,June 15, 2004 <br /> Attention Rita Koehnen <br /> Port of Stockton Report Page 7 of 14 <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 3-5 Sample Type Grab <br /> Laboratory ID. 0401800-04 Project Name Port of Stockton UST Site No 3 <br /> Date/Time Sampled 21-May-04 13 52 by Jun Neal Sample Matrix Ground Water-Non Potable <br /> [Test Parameter Result DLR Unit Dilution Batch Prepared Analysis Date Method Notes <br /> Benzene ND 0 500 ug/1 1 AF41501 27-May-04 28-May-04 EPA 8260B <br /> Ethylbenzene ND 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 82606 <br /> m,p-Xylene ND 0 500 ug/1 1 AF41501 27-M2y-04 28-May-04 EPA 82608 <br /> o-Xylene ND 0 500 ugll 1 AF41501 27-May-D4 28-May-04 EPA 8260E <br /> Surrogate 4-Bromotluorobenzene <br /> 92% 86-115 <br /> m91L—miiligrants per Luer=ppm DLR=Detection Limitfar Purpose afReportmg <br /> ug'L—micrograms per Liter=ppb Lsceptional sample marricev or interferences may <br /> result in hrgher detection hmits <br /> ECTFULLY SUBMITTED, <br /> Jonathan Le, Laboratory Director <br /> 7743 N West Lane Suite B2 Stockton CA 9.5210 nhone (209) 477-8105 Ftiy 009) -177-RI-JR <br />