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819 Stdker Avenue,Sulte 8 <br /> Sequoia <br /> eq y1 off" a . • Savam 916 CA 95834 <br /> 6kt Y (916)921-9600 <br /> FAX(916)921-0100 <br /> D- Analytical www.sequoialabs.com <br /> Sierra-Pacific Groundwater,Inc. Project: Unocal Puregro Broadway - <br /> 4911 Windplay Drive,Ste. 4 Project Number: N/A Reported: <br /> El 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 %REC RPD <br /> Analyte Result Limit Units Level Result -MEC Limits RPD Limit Nous <br /> Batch IF05001-EPA 5030B(MeOI) <br /> Blank(1F05001-BLK4) Prepared&Analyzed:06/11/01 <br /> 1,2-Dichlorobenzene ND 0.10 mg/kg <br /> 1,2-Dibromo-3-chloropropme ND 0.50 " <br /> 1,2,4-Trichlorobenzene ND 020 " <br /> Naphthalene ND 0.25 " <br /> Hexachlorobutadiene ND 0.50 " <br /> 1,2,3-Trichlorobenzene ND 0.50 " <br /> Surrogate:Dibromofluoromethane 2.22 2.50 88.8 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 2.29 2.50 91.6 50-150 <br /> Surrogate: Toluene-d8 2.77 2.50 111 50-150 <br /> Surrogate:4-Bromofluorobemene 2.60 2.50 104 50-150 <br /> LCS (1F05001-BSI) Prepared&Analyzed:06/05/01 <br /> Methyl tert-butyl ether 2.38 0.10 mg/kg 2.50 95.2 70-130 <br /> I,I-Dichloroethene 1.91 0.20 2.50 76.4 65-135 <br /> Methyl tert-butyl ether 2.38 0.20 2.50 95.2 70-130 <br /> Benzene 2.02 0.20 2.50 80.8 70-130 <br /> Trichloroethene 2.16 0.25 2.50 86.4 70-130 <br /> Toluene 2.27 0.50 2.50 90.8 70-130 <br /> Chlorobenzene 2.30 0.10 2.50 92.0 70-130 <br /> Surrogate:Dibromofluoromethane 2.28 2.50 91.2 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 2.29 1.50 91.6 50-150 <br /> Surrogate:Dibromofluoromethane 2.28 2.50 91.2 50-150 <br /> Surrogate:l,2-Dichloroethane-d4 2.29 2.50 91.6 50-150 <br /> Surrogate:Toluene-d8 2.63 2.50 105 50-150 <br /> Surrogate:4-Bromofluorobemene 2.59 2.50 104 50-150 <br /> LCS(1F05001-BS2) Prepared&Analyzed:06/06/01 <br /> Methyl tert-butyl ether ND 0.10 mg/kg 2.50 70-130 <br /> Surrogate:Dibromofluoromethane ND 2.50 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 ND 2.50 50-150 <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 16 of 19 <br />