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4T) Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> WO Analytical (916)921-9600 <br /> FAX(916)92 1-0 100 <br /> EMC ON-CP <br /> Project: ARCO 2186,Stockton,CA <br /> 3939 Cambridge Ave Project Number: 21775-237-002 Sampled: 6/17/99 <br /> Cameron Park,CA 95682ProjReceived: 6/18/99 <br /> ect Manager: Mark Caps Reported: 7/1/99 <br /> Total Metals by EPA 6000/7000 Series Methods/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 /> Batch: 9060317 Date Prepared- 6/22/99 <br /> Blank 9060317-BLIKI Extraction Method: EPA 3050B <br /> Lead 6/24/99 <br /> ND mg/kg 2.50 <br /> LCC 9060317-BCI <br /> Lead 6/24/99 50.0 <br /> 48.9 mg/kg 80.0-120 97.8 <br /> Matrix,pilo 90603__ 17-HS1 5906319-14 <br /> Lead 6/24/99 50.0 ND <br /> 48.7 mg/kg 80.0-120 97.4 D <br /> Matrix Spike D up 906031_�1. 5906319-14 <br /> Lead 6/24/99 50.0 ND 48.0 mg/kg 80.0-120 96.0 20.0 1.45 D <br /> Sequoia Analytical -Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> Page 12 of 14 <br />