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PUBLIC MEALTH SERViCES <br /> EoPqu���.c <br /> SAN JOAQUIN COUNTY ? � <br /> ENVIRONMENTAL HEALTH DIVISION _ <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floori • P. O Box 388 • Stockton, CA 1 3�$ , c ', <br /> 1209/468-3420 i� <br /> C 7 <br /> MR FRANK RYAN ! , <br /> FRANK RYAN REALTY <br /> 745 DISTAL DR <br /> LOS ALTOS CA 94022 <br /> f I <br /> RE: Fuller Mobile Home Park ' SITE CODE: 2491 <br /> 365 East. Louise <br /> Lathrop CA 94022 <br /> j <br /> i <br /> ! <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHSIEHD), has prepared this correspondence in response to a telephone F <br /> conversation which occurred on October 1, 1996 between PHS/EHD staff and <br /> yourself where you requested:written.correspondence stipulating conditions required <br /> for closure of this site and what steps should be taken to fulfill those conditions. <br /> A well survey has not been conducted for this site. A well survey is critical for the' <br /> site to be fully assessed. The site cannot be considered for closure if there is <br /> potential for this plume to adversely affect nearby drinking water wells, thereby <br /> affecting human health. <br /> The site assessment is not complete! Currently only the vertical and the western <br /> extent of soil contamination has been defined. If the northern and southern extent can <br /> be defined then the eastern extent may be estimated. The lateral and vertical extent <br /> of soil contamination must be�'defined in order to calculate a mass balance of residual <br /> hydrocarbons in the soil. The'mass balance of hydrocarbons in the groundwater <br /> plume must also be calculated. Residual hydrocarbons are considered a secondary <br /> source of contamination. <br /> The potential for the plume to affect the environment and human health can be <br /> estimated using a fate and transport model. The model uses the mass balance of <br /> hydrocarbons and site specific hydrogeologic attributes such as bulk density, intrinsic <br /> permeability, and carbon fraction. The model will simulate the loading of <br /> hydrocarbons into the plume from the soil and groundwater hydrocarbon mass (fate). <br /> The simulation will estimate the life span of the plume and the potential for plume <br /> stability to occur, and will show the maximum areal extent of the plume (transport). <br /> The estimated probable maximum plume will be compared to the well survey data, <br /> and other pathways such as storm drains and basements, to determine the human <br /> health risk posed by the plume (risk assessment). <br /> 3 <br /> + Y <br /> i <br /> Ii <br /> i <br /> A Division of San Joaquin County Health Care Services ! <br />