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819 Striker Avenue,Suite 8 <br /> Sequoia <br /> pia • Sacramento,CA 95834 <br /> ® 1 Y.S.ttJ (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> qQFAnalyt ical www.sequolalabs.com <br /> Sierra-Pacific Groundwater,Inc. Project: Unocal Puregro Broadway <br /> 4911 Windplay Drive,Ste, 4 Project Number: N/A Reported: <br /> EI Dorado Hills CA,95762 Project Manager: John Rapp 06/15/01 16:23 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch IF05001-EPA 5030B(MeOM <br /> Blank(IF05001-BLK3) Prepared&Analyzed:06/07/01 <br /> sec-Butylbenzene ND 0.25 mg/kg <br /> p-lsopropyltoluene ND 0.20 " <br /> 1,3-Dichlorobenzene ND 0.10 " <br /> 1,4-Dichlorobenzene ND 0.10 " <br /> n-Butylbenzene ND 0.20 " <br /> 1,2-Dichlorobenzene ND 0.10 " <br /> 1,2-Dibromo-3-chloropropane ND 0.50 <br /> 1,2,4-Trichlorobenzene ND 0.20 " <br /> Naphthalene ND 0.25 " <br /> Hexachlorobutadiene ND 0.50 " <br /> 1,2,3-Trichlorobenzene ND 0.50 " <br /> Surrogate:Dibromofluoromethane 2.25 2.50 90.0 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 2.35 2.50 94.0 50-150 <br /> Surrogate.:DibromQ)Iuoromethane 2.25 2.50 90.0 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 2.35 2.50 94.0 50-150 <br /> Surrogate:Toluene-d8 2.70 2.50 108 50-150 <br /> Surrogate:4-BromoJluorobemene 2.65 2.50 106 50-150 <br /> Blank(IF05001-BLK4) Prepared&Analyzed:06/11/01 <br /> Dichlorodifluoromethane ND 0.10 mg/kg <br /> Chloromethane ND 0.20 " <br /> Vinyl chloride ND 0.20 " <br /> Bromomethane ND 0.50 " <br /> Chloroethane ND 0.20 " <br /> Trichlorofluoromethane ND 0.20 " <br /> 1,1-Dichloroethene ND 0.20 " <br /> Methylene chloride ND 1.0 " <br /> Methyl tert-butyl ether ND 0.20 " <br /> trans-1,2-Dichloroethene ND 0.25 " <br /> 1,1-Dichloroethane ND 0.10 " <br /> 2,2-Dichloropropane ND 0.20 " <br /> cis-1,2-Dichloroethene ND 0.20 " <br /> Bromochloromethane ND 0.25 " <br /> Chloroform ND 0.10 " <br /> 1,1,1-Trichloroethane ND 0.20 " <br /> Carbon tetrachloride ND 1.0 " <br /> Sequoia Analytical-Sacramento 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 /> Page 14 of 19 <br />