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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988 9600 <br /> Analytical FAX988-9673 <br /> www�seuum oialab5 can <br /> 'OFSecor--Rancho Cordova Protect Arco <br /> 3017 Kilgore Rd,Ste #100 Protect Number Arco#2133,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 14-Aug-02 13 16 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2HO5003-EPA 5030B(MeOH) <br /> Blank(21105003-BLK1) Prepared&Analyzed 05-Aug-02 <br /> Styrene ND 025 mg/kg <br /> Bromoform ND 010 " <br /> lsopropylbenzene ND 020 " <br /> 1,1,2,2-Tetrachloroethane ND 020 " <br /> Bromobenzene ND 020 " <br /> n-Propylbenzene ND 010 " <br /> 1,2,3-Tnchloropropane ND 025 <br /> 2-Chlorotoluene ND 020 " <br /> 1,3,5-Trtmethylbenzene ND 020 <br /> 4-Chlorotoluene ND 010 " <br /> tert-Butylbenzene ND 020 " <br /> 1,2,4-Trunethylbenzene ND 020 <br /> •sec-Butylbenzene ND 025 " <br /> p-lsopropyltoluene ND 020 <br /> 1,3-Dichlorobenzene ND 010 " <br /> 1,4-Dichlorobenzene ND 010 " <br /> n Butylbenzene - ND 020 <br /> 12-Dichlorobenzene ND 010 " <br /> 1,2-Dibromo-3-chloropropane ND 050 " <br /> 1,2,4-Tnchlorobenzene ND 020 " <br /> Naphthalene ND 025 " <br /> Hexachlorobutadiene ND 050 " <br /> 1,25-Tnchlorobenzene ND 050 " <br /> Surrogate Dibromofluaromethane 140 250 960 50-150 <br /> Surrogate I2-Dichloroethane-d4 169 150 108 50-150 <br /> Surrogate Toluene-d8 286 250 114 50-150 <br /> Surrogate 4-Bromofluorobenzene 289 250 116 50-150 <br /> . Sequoia Analytical-Walnut Creek The results to 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 /> Page 16 of 20 <br />