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PUBL t, HEALTH SEI VICES <br /> •G � <br /> SAN JOAQUIN COUNTY a' -,4\ yi <br /> JOG[KHANNA M.D.,MRH <br /> Health Officer �P <br /> a�fFo.R�; <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> MR CHUCK CARMEL <br /> ARCO PRODUCTS COMPANY - ' <br /> P O BOX 5811 MAR 16 1992 <br /> SAN MATEO CA 94402 <br /> RE: ARCO SITE CODE: 1416 <br /> 3425 Tracy Blvd. <br /> Tracy, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Fourth Quarter Monitoring <br /> Report" for the above referenced site. This report contains <br /> analytical results from 12 groundwater monitoring wells <br /> associated with a site assessment due to an unauthorized release. <br /> The extent of downgradient groundwater contamination has not been <br /> fully identified as indicated from results of ATR-8. In order to <br /> continue to characterize the plume, it is essential that ARCO <br /> install an additional well/wells in a downgradient position, <br /> develop, sample and submit the results to PHS/EHD and Central " <br /> Valley Regional Water Quality Control Board for review. <br /> If you have any further questions regarding this matter, contact <br /> Harlin Knoll, REHS, at (209) 468-3442, <br /> Jogi Khanna, M.D. , M.P.H. <br /> Health Officer <br /> Laurie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> l.� LAC/HK: lb <br /> c: Brown and Caldwell <br /> 723 "S" Street <br /> Sacramento, CA 95814-7092 <br /> A Division of San Joaquin County Health Care Services <br />