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PUBLIC HEALTH SERVICES Nod 4 <br /> SAN JOAQUIN COUNTY c. <br /> JOGI KHANNA M.D., M.P.H. <br /> Health Officer <br /> C4ii . . . . . � p�P <br /> P.O. Box 2009 • ( 1601 East Hazelton Avenue) • Stockton, California 95201 v o a <br /> (209) 468-3400 <br /> ROGER LISTON <br /> 3450 EL CAMINO FEB 1 7 19 ,13 <br /> CERES CA 95307 <br /> RE: Gasco Service Station SITE CODE: 1060 <br /> 749 E. Charter Way <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has recently <br /> reviewed activities at the above mentioned site and has the following comments. <br /> A survey of wells within 2,000 feet of the site should be conducted. This will identify any gradient <br /> influences and possible direction of contaminant plume migration. <br /> The plume of groundwater contamination must be physically defined in order to design a proper <br /> remediation plan. This further definition should be accomplished by installing additional monitoring wells. <br /> Placement of these wells should be based on information obtained from water level measurements and <br /> gradient determination. A workplan for additional monitoring well construction is to be submitted to this <br /> office by March 31, 1993. <br /> In addition please be advised that per "California Code of Regulations", Title 23, Division 3, Chapter 16, <br /> Section 2652(d) quarterly reports shall continue to be submitted to PHS/EHD and Central Valley <br /> Regional Water Quality Control Board until the investigation and cleanup of the. site is deemed adequate. <br /> If you have any questions, contact Michael Collins, EHS, of my staff at (209) 468-0338. <br /> JogiKhanna, D., M.P.H. <br /> Health Off r <br /> r <br /> uric A. Cotulla, REHS, Program Manager <br /> �mgronmentaf Health Division <br /> LAC/MC:Ib <br /> C, California Geophysical Group, Inc. <br /> C' CVRWQCB, Elizabeth Thayer <br /> A Division of San Joaquin County Health Care Services <br />