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" PRECISION( j <br /> ENWRO-TECH <br /> Analytical Laboratory CERTIFICATE OFANALYSIS <br /> Tuesday,March 13, 2007 <br /> Attention: Guy W.Roy <br /> R&L Diesel Report Page 20 of23 <br /> P.O.Box 2498 , <br /> Danville, CA 94526 <br /> Volatile Organic Compounds by EPA Met od 8260B-Quality Control <br /> Precision Enviro- ech <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units lAwel Result %REC Limits RPD Limit Notes <br /> Batch AB72708-Volatiles <br /> BIank(AB72708-BLKl) Prepared&Analyzed:27-Feb-07 <br /> Ethyl tert-Butyl Ether(ETBE) ND 2.00 ug/kg <br /> f <br /> m,p-Xylene ND 2.00 s <br /> tert-Amyl Methyl Ether(TAME) ND 2.00 " <br /> o-Xylene ND 2.00 " <br /> tert-Butyl Aoohol(TBA) ND 50.0 " <br /> Diisopropyl Ether(DIPS) ND 2.00 " <br /> Surrogate:Dibromofluoromethane 56.9 50.0 114 86-118 <br /> Surrogate:Toluene-d8 55.0 50.0 110 88-110 <br /> Surrogate:4-Bromofluorobenzene 57.0 5 .0 114 86-115 <br /> LCS(AB72708-BSJ) Prep ired&Analyzed:27-Feb-07 <br /> Benzene 54.0 2.00 ug/kg 42.0 123 88-124 <br /> Chlorobenzene 44.0 2.00 4 .0 100 88-117 <br /> 1,I-Dicbloroethene 41.0 2.00 4A.0 93 79-133 i <br /> Toluene 40.0 2.00 .0 91 88-122 <br /> Trichloroethene 45.0 2.00 42.0 102 85-117 <br /> Surrogate:Dibromofluoromethane 47.0 5(W 94 86-118 <br /> Surrogate: Toluene-d8 55.0 5(W 110 88-110 <br /> Surrogate:4-Bromofluorobenzene 57.0 5 .0 114 86-115 <br /> LCS Dup(AB72708-BSD1) Prepared&Analyzed:27-Feb-07 <br /> Benzene 54.0 2.00 ug/kg4 .0 123 88-124 0 15 <br /> Chlorobenzene 44.0 2.00 .0 100 88-117 0 15 <br /> 1,1-Dichloroethene 42.0 2.00 .0 95 79-133 2 15 <br /> Toluene 42.0 2.00 4-0.0 95 88-122 5 15 <br /> Trichloroethene 46.0 2.00 441.0 105 85-117 2 15 <br /> Surrogate:Dibromofluoromethane 55.1 56.0 110 86-118 <br /> Surrogate:Toluene-d8 55.0 56.0 110 88-110 <br /> Surrogate:¢-Bromofluorobenzene 57.0 56.0 114 86-115 <br /> mg/L=milligrams per Liter-ppm DLR=Detection Ltmit forPurpose of Reporting. <br /> ug/L=micrograms per Liter=ppb Exceptional sample matrices or interferences may li <br /> result in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> ��5/Ot'r� <br /> Jonathan Le,Laboratory Director <br /> 3935 N. Coronado Ave Stockton CA. 95204 vhone: (209) 47 -8105 Fax: (209) 477-8148 <br />