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• • 819 Striker Avenue, 958 8 <br /> Sequoia Sacramento, 9Z 95834 <br /> �.E- (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical <br /> yy aly8-q ca� www.sequolalabs.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 %REC Limits RPD Limit Notes <br /> Batch 1F05001-EPA 5030B (MeOH) <br /> LCS(1F05001-BS3) Prepared&Analyzed:06/07/01 <br /> Methyl cert-butyl ether _ 2.12 0.10 mg/kg 2.50 84.8 70-130 <br /> 1,1-Dichloroethene 1.67 0.20 2.50 66.8 65-135 <br /> Methyl tert-butyl ether 2.12 0.20 2.50 84.8 70.130 <br /> Benzene 1.90 0.20 2.50 76.0 70.130 <br /> Trichloroethene 2.04 0.25 2.50 81.6 70-130 <br /> Toluene 2.14 0.50 2.50 85.6 70.130 <br /> Chlorobenzene 2.30 0.10 2.50 92.0 70-130 <br /> Surrogate:Dibromofluoromethane 2.25 2.50 90.0 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 2.30 2.50 92.0 50-150 <br /> Surrogate:Dibromofluoromethane 2.25 2.50 90.0 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 2.30 2.50 92.0 50-150 <br /> Surrogate:Toluene-d8 2.75 2.50 110 50-150 <br /> Surrogate:4-Bromofluorobenzene 2.65 2.50 106 50-150 <br /> LCS(1F05001-BS4) Prepared&Analyzed:06/11/01 <br /> 1,1-Dichloroethene 1.50 0.20 mg/kg 2.50 60.0 65-135 Q-01 <br /> Methyl tert-butyl ether 2.00 0.20 2.50 80.0 70-130 <br /> Benzene 1.88 0.20 2.50 75.2 70-130 <br /> Trichloroethene 2.01 0.25 2.50 80.4 70-130 <br /> Toluene 2.16 0.50 2.50 86.4 70-130 <br /> Chlorobenzene 2.26 0.10 2.50 90.4 70-130 <br /> Surrogate:Dibromofluoromethane 2.23 2.50 89.2 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 2.25 2.50 90.0 50-150 <br /> Surrogate:Toluene-d8 2.75 2.50 110 50-150 <br /> Surrogate:4-Bromofluorobenzene 2.90 2.50 116 50-150 <br /> Matrix Spike(1F05001 MS1) Source:S105461-01 Prepared&Analyzed:06/05/01 _ <br /> Methyl Cert-butyl ether 230 0.10 mg/kg 2.50 ND 92.0 60-140 <br /> 1,1-Dichloroethene 1.88 0.20 2.50 ND 75.2 60-140 <br /> Methyl tert-butyl ether 2.30 0.20 2.50 ND 92.0 60-150 <br /> Benzene 2.01 0.20 2.50 ND 80.4 60-140 <br /> Trichloroethene 2.12 0.25 2.50 ND 84.8 60-140 <br /> Toluene 2.22 0.50 2.50 ND 88.8 60-140 <br /> Chlorobenzene 2.29 0.10 2.50 ND 91.6 60-140 <br /> Surrogate:Dibromofluoromethane 2.26 2.50 90.4 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 2.32 2.50 92.8 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 17 of 19 <br />