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680 Chesapeake Drive Redwood C ty CA 94063 (650)364-9600 FAX(650) 364-9233 ' <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16)921-9600 FAX(916)92.1-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792-03-4Z <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Project ARCO 6020, Manteca,CA Sampled 5/7199 to 5/11/99 <br /> Pinnacle C P <br /> 3939 Cambridge Road,Ste 220 Project Number NIA Received 5112/99 <br /> Cameron Park,CA 95682 Proicct Manager Joel Coffman Reported 5/27199 <br /> Total Metals by EPA 6000/7000 Series Methods/Quality Control <br /> Sequoia Analytical-Sacramento ' <br /> Date Spike Sample QC Reporting Lieut Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch. 9050162 5/171 Extraction Method, EPA 3050B , <br /> F1la[1k 9050162-ULKI ND mg/kg 250 <br /> Lead 5/17/99 <br /> LCs — <br /> Lead 5/17/99 500 509 mg/kg 800-120 <br /> 102 <br /> Matrix Spike 9050162-MS1. 5905178-09 D <br /> Lead 5/17/99 500 ND 525 mg/kg 800-120 105 <br /> Matrix Spike Dup 2050162-IUSD-1 S905178-99 <br /> Lead _ 5/17/99 500 _ ND 51 9 mg/kg 800-120 104 200 0 957 D <br /> e <br /> ZSequoia Analytical-Sacramento *Refer to end of report far text ojnotes and definrteons <br /> Page 8 of 10 <br /> onaW Bobel,Client Services epresentanve <br />