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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Geek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 155 Industrial Woad San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> a <br /> Emcon-Cameron Park Project ARCO 6020 Manteca,Ca Sampled 5/17199 <br /> 3939 Cambridge Road, Ste 202 Project Number N/A Received 5117199 <br /> Cameron Park,CA 95682 Project Manager Joel Coffman Reported 5118199 e <br /> Volatile Organic Compounds by EPA Method 8010B/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 /> Matrix Spike 90502Q3-MS1 S905217-02 , <br /> Chlorobenzene 5118199 400 ND 434 ug/kg 600-140 109 <br /> ],I-Dichloroethane 200 ND 198 600-140 990 <br /> Trichloroethene 200 ND 190 600-140 950 <br /> Surrogate Bromochloromethane 200 194 600-140 970 <br /> Surrogate 2-Chlorotoluene 200 242 to600-140 121 <br /> Matrix Spike,Dup 9050203-MSDl S905217-02 <br /> Chlorobenzene 5118199 400 ND 432 ug/kg 600-140 108 250 0 922 <br /> I,1-Dichloroethane 200 ND 202 600-140 101 250 200 <br /> Trichloroethene 200 ND 190 600-140 950 250 0 <br /> Surrogate Bromochloromethane 100 206 600-140 103 <br /> Surrogate 2-Chlorotoluene 200 214 600-140 107 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Ronald W Bobcl,Client Services Representative Page 8 of 9 <br />