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1 <br /> IT Corp Project 7-Eleven#21756 <br /> 4005 Port Chicago Hwy Project Number 781723 Reported <br /> ' Concord CA,94520 Project Manager Shelby Lathrop 4/6/02 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> ISunStar Laboratories, Inc. <br /> Reporting Spike Source %REC RPD <br /> ' Analyte Result Limit Units Level Result %REC Limits RPD Limit Motes <br /> Batch 2040403 -EPA 5030 Soil MS <br /> Blank(2040403-BLKi) Prepared&Analyzed 04/03/02 <br /> ' Ethyl tert-butyl ether ND 20 ug/kg <br /> Hexachlorobutadiene ND 50 <br /> Isopropylbenzene ND so <br /> ' p-Isopropyltoluene ND 50 <br /> Methylene chloride ND 50 <br /> Methyl tert-butyl ether ND 20 " <br /> Naphthalene ND 50 <br /> n-Propylbenzene ND 50 <br /> Styrene ND 50 <br /> Tert-amyl methyl ether ND 20 <br /> 1,1,2,2 Tetrachloroethane ND 50 " <br /> Tert-butyl alcohol ND 50 <br /> 1,1,1,2-Tetrachloroethane ND 50 " <br /> Tetrachlaroethene ND 50 " <br /> Toluene ND 50 <br /> 1 2,3-Trichlorobenzene ND 50 <br /> 1,2,4-Tnchlorobenzene ND 50 " <br /> 1,1,2-Trichloroethane ND 50 <br /> 1,1,1-Trichloroethane ND 50 <br /> Trichloroethene ND 50 <br /> ' Tnchlorofluoromethane ND 50 <br /> 1,2,3-Trichloropropane ND 50 <br /> 1,3,5-Trimethylbenzene ND 50 " <br /> 1,2,4-Tri methylbenzene ND 50 " <br /> Vinyl chloride ND 50 ; <br /> m,p-Xylene ND 50 <br /> o-Xylene ND 50 " <br /> Surrogate Toluene-d8 944 100 944 81-117 <br /> Surrogate 4-Bromofluorobenzene 93 2 100 93 2 74-121 <br /> Surrogate Dibromofluoromethane 966 100 966 80-120 <br /> 1 <br /> 1 <br /> . SunStar Laboratories, Inc The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> i <br /> Leah B� halne,Project Manager Page 12 of 17 <br />