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c, <br /> CLOSURE SUMMARY REPORT ADDENDUM <br /> ' Yellow Submarine <br /> 140 West Harding Way <br /> Stockton, Callfomla <br /> January 1995 <br /> 1.0 INTRODUCTION <br /> ' In accordance with the request of Ms. Deborah Reade, on behalf of the Campodonico and <br /> Tiscornia Trusts, Geological Audit Services, Inc. (GeoAudit) has prepared this Closure <br /> ' Summary Report Addendum for the property located at 140 West Harding Way in Stockton, <br /> California (the site). The Technical Review Committee (TRC) of the San Joaquin County <br /> Public Health Services - Environmental Health Division (PHS/EHD), has required the use <br /> ' of a fate and transport computer generated model for residual contamination at the site <br /> before a recommendation for site certification/closure to the CentralValley Regional Water <br /> Quality Control Board (CVRWQCB) will be made. <br /> ' The site is located in a flat commercial/residential area of central Stockton (Figure 1). The <br /> property is currently vacant and undeveloped (Figure 2). <br /> 2.0 SESOIL MODELING PROGRAM <br /> 2.1 Overview of SESOIL <br /> ' The American Petroleum Institute's (API) Risk/Exposure Assessment Decision Support <br /> System (DSS) is a modeling program developed to estimate human exposure and risk from <br /> ' contaminated sites. Several modeling options are contained in DSS, including SESOIL and <br /> AT123D. SESOIL uses information obtained from the site assessment of contaminants, <br /> hydrogeological, and meteorological information to estimate the mass of contaminants that <br /> will reach groundwater over a given time frame. AT123D can be used to determine <br /> contaminant concentrations in a receptor well located down-gradient from a contaminant <br /> source. AT123D uses the information generated by SESOIL as the input data, <br /> ' Chemical properties and health risk data for 26 chemicals of possible concern are supplied <br /> in the program including benzene, toluene, ethylbenzene and xylene. Total petroleum <br /> ' hydrocarbons (TPH) is not an individual chemical with definite properties, and therefore is <br /> not included on the list of chemical choices. Output can be displayed in several ways, <br /> including annual reports, tables and graphs. <br /> 0-1.01 Mdd SrM--1-F 1 <br /> Y dor Subr rice SESOIL I." <br /> 51 S f <br />