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a <br /> 819 Striker Avenue.Suite 8 <br /> 4 Sequoia Sacramento.CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> SECOR International-Sacramento Project: ARCO 4493, Stockton, CA Sampled: 9/24/99 <br /> 9912 Business Park Dr., Ste, 100 Project Number: 077.41844.012 Received: 9/24/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 1018199 <br /> Volatile Organic Compounds by EPA Method 8260A./Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> LCS 9090297-BSI <br /> Benzene 9/28/99 50.0 53.6 ug/l 70.0-130 107 <br /> Chlorobenzene 50.0 54.6 70.0-130 109 <br /> 1,1-Dichloroethene 50.0 52.6 70.0-130 105 <br /> Toluene 50.0 57.0 70.0-130 114 <br /> Trichloroethene 50.0 48.6 70.0-130 97.2 <br /> Surrogate: Dibromofluoromethane 50.0 52.6 70.0-130 105 <br /> Surrogate: 1,2-DCA-d4 50.0 55.8 70.0-130 112 <br /> Surrogate: Toluene-d8 50.0 55.2 or 70.0-130 110 <br /> Surrogate: 4-BFB 50.0 46.0 70.0-130 92.0 <br /> LCS Dun 9090297-BSD1 <br /> Benzene 9128/99 50.0 54.0 Ugh 70.0-130 108 25.0 0.930 <br /> Chlorobenzene 50.0 55.6 70.0-130 111 25.0 1.82 <br /> acichloroethene 50.0 53.6 70.0-130 107 25.0 1.89 <br /> ne 50.0 56.8 70.0-130 114 25.0 0 <br /> _T_ichloroethene _ 50.0 48.2 70.0-130 96.4 _25.0 0.826 <br /> Surrogate: Dibromofluoromethane 50.0 54.8 70.0-130 110 <br /> Surrogate: 1,2-DCA-d4 50.0 57.8 70.0-130 116 <br /> Surrogate: Toluene-d8 " 50.0 56.4 70.0-130 113 <br /> Surrogate: 4-BFB 50.0 48.4 70.0-130 96.8 <br /> Matrix Sp ike 9090297-MSI 5909367-01 <br /> Benzene 9129/99 100 170 269 ug/1 60.0-140 99.0 D <br /> Chlorobenzene 100 ND 110 60.0-140 110 D <br /> 1,I-Dichloroethene 100 ND 112 60.0-140 112 D <br /> Toluene 100 ND 121 60.0-140 121 D <br /> Trichloroethene _ 100 8.44 _ 102 60.0-140 93.6 <br /> Surrogate: Dibromofluoromethane 50.0 55.6 70.0-130 111 <br /> Surrogate: 1,2-DCA-d4 50.0 52.8 70.0-130 106 <br /> Surrogate: Toluene-d8 50.0 59.4 70.0-130 119 <br /> Surrogate: 4-BFB 50.0 53.6 70.0-130 107 <br /> Matrix Spike Dup 9090297-MSD1 S909367-01 <br /> Benzene 9/29199 100 170 277 ug/I 60.0-140 107 25.0 7.77 D <br /> Chlorobenzene 100 ND 111 60.0-140 Ill 25.0 0.905 D <br /> 1,1-Dichloroethene 100 ND 110 or60.0-140 110 25.0 1.80 D <br /> Toluene 100 ND 114 60.0-140 114 25.0 5.96 D <br /> Trichloroethene_ 100 _8.44 102_ "_- 60.0440 93.6 25.0 0 D <br /> Surrogate: Dibromofluoromethane 50.0 54.4 70.0-130 109 <br /> Surrogate., 1,2-DCA-d4 50.0 55.2 70.0-130 110 <br /> wle: Toluene-d8 50.0 56.0 70.0-130 112 <br /> Sequoia Analytical- Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 12 of 14 <br />