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PRECISION <br /> ENVIRO-TECH <br /> A nalytical Laboratory CERTIFICATE OFANAL MIS <br /> Tuesday,June 15, 2004 <br /> Attention Rete Koehnen <br /> Port of Stockton Report Page 13 of 14 <br /> P O Box 2089 <br /> Stockton, CA 95201-2089 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Precision Envlro-Teal <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AF41501 -Volatiles <br /> I <br /> Blank(AF41501-BLKI) Prepared&Analyzed 27-May-04 <br /> Benzene ND 0 500 ug/1 <br /> Ethylbenzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> m p-Xylene ND 0 500 " <br /> o-Xylene ND 0 500 " <br /> LCS(AF41501-BS 1) Prepared&Analyzed 27-May-04 <br /> Benzene 315 0 500 ug/1 320 98 88-124 <br /> Ethylbenzene 302 0 500 320 94 88-124 <br /> ne <br /> 305 0 5D0 " 320 95 88-122 <br /> ylene 64 4 0 500 640 101 88-122 <br /> o- ylerie 332 0 500 320 104 88-122 <br /> Matrix Spike(AF41501-MSI) Source 0401800-06 Prepared 27-May-04 Analyzed 28-May-04 <br /> Benzene 396 0 500 ug/l 400 0 750 97 88-124 <br /> Ethylbenzene ND 0 500 " ND 88-124 <br /> Toluene 389 0 500 400 ND 97 88-122 <br /> m,p-Xylene ND 0 500 ND 88-122 <br /> o-Xylene ND 0500 ND 88-122 <br /> Matrix Spike Dup(AF41501-MSD1) Source 0401.800-06 Prepared 27-May-04 Analyzed 28-May-04 <br /> Benzene 41 0 0 500 ug/! 400 0 750 101 88-124 3 15 <br /> Ethylbenzene ND 0500 ND 88-124 15 <br /> Toluene 420 0 500 400 ND 105 88-122 8 15 <br /> m,p Xylene ND 0500 ND 88-122 15 <br /> o-Xylene ND 0 500 ND 88-122 15 <br /> mg L-nulligrams per Liter—ppm DLR—Detection Limitfnr Purpose of Reporimg <br /> ug L—micrograms per Liter=ppb Exceptional sample matrices or interferences may <br /> result in higher detection limits <br /> orECTFULLY SUBMITTED, <br /> Jonathan Le,Laboratory Director <br /> 7743 tV West Lane Suite B2 Stockton CA 95210 nhone (209) 477-8I05 Fnx (209) .177-R1-19 <br />