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PUBLIC HLOALTH SERVIAS <br /> SAN JOAQUIN COUNTY Q <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �.. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 q FoaN <br /> 209/468-3420 JUN 1 12001 <br /> GENE GABBARD JIM & SHEYLA CREEL <br /> P O BOX 1260 12511 MUNDY <br /> STOCKTON CA 95212 LODI CA 95240 <br /> RE: Gene Gabbard, Inc. <br /> 640 N. EI Dorado <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the Groundwater Monitoring Well Installation Report dated April 12, 2001 that was <br /> prepared by Ground Zero Analysis, Inc. on your behalf and has the following comments. <br /> The report documents fieldwork that took place on December 13-14, 2000 when four shallow <br /> groundwater monitoring wells were installed on site. Soil samples for analysis were collected <br /> during the drilling of the boreholes, and the monitoring wells were developed and sampled on <br /> December 19, 2000. <br /> Soil analytical results from this and from previous site investigations have defined the vertical <br /> extent of the petroleum hydrocarbon contamination in the former underground storage tank <br /> (UST) pit area at thirty-six feet below surface grade (bsg). Lateral definition of the soil <br /> contamination has been made, except to the west of the UST area; the twenty-foot bsg <br /> sample from S13-6 had 4,800 milligrams per kilogram (mg/kg) total recoverable petroleum <br /> hydrocarbons. Analytical results from the monitoring well water samples were positive for <br /> petroleum hydrocarbons and volatile organic compounds in monitoring well MW-3, the well <br /> located near the former UST. The lateral wells, MWA, MW-2 and MW-4, were non-detect for <br /> petroleum hydrocarbons, but had detections of various volatile organic compounds. The <br /> direction of groundwater flow was determined to be towards the northeast. <br /> The report recommends collecting additional groundwater samples to confirm the initial <br /> results. PHS/EHD concurs with this recommendation. Routine quarterly groundwater <br /> monitoring and sampling should be initiated at this site and should continue until further <br /> notice from PHS/EHD. If you have any questions call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS Dot Lofstrom R.G. <br /> LOP/Site Mitigation Unit IV Engineering Geologist <br /> cc: Marty Hartzell, CVRWQCB <br /> John Lane, Ground Zero Analysis <br /> A Division of San Joaquin County Health Care Services <br />