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ENVIRONMENTAL TECHNOLOGIES CORPORATION -+ i F/ <br /> August 9, 1995 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Contaminant Fate and Transport Modeling Parameters, Stockton Police Facility, <br /> 22 East Market Street, Stockton, California <br /> Ms. Meays: <br /> This letter report has been prepared by Smith Environmental Technologies Corporation (Smith <br /> Environmental), on behalf of the City of Stockton, to summarize contaminant fate and <br /> transport modeling parameters used to determine the expected fate of residual subsurface soil <br /> contaminants at the above referenced site. Modeling parameters were requested by San <br /> Joaquin County Environmental Health Department, Environmental Health Division <br /> (PHS/EHD) for review prior to completion of modeling efforts. <br /> PROGRAM SESOIL INPUT DESCRIPTION <br /> Smith Environmental is using the computer program SESOIL to simulate the fate and transport <br /> of the residual soil contamination remaining under the Police Building. The input parameters <br /> for the Stockton Police Facility vertical transport model are summarized in Table 1. The input <br /> parameters discussed below are grouped into five sections: weather; initial soil concentration; <br /> soil profile; soil properties; and, chemical parameters. <br /> Weather <br /> SESOIL was supplied from General Sciences Corporation with a climatic database for the state <br /> of California. A Stockton weather station "Stockton Disposal PL" is selected because it is the <br /> closest available station to the site (Latitude 37.993 and Longitude 121.333 degrees). <br /> Initial Soil Concentration <br /> For each chemical of interest, benzene, toluene, xylenes and ethylbenzene, the highest <br /> concentration found near or in the unexcavated impacted area is specified for input. The <br /> 1710 Main Street • Escalon,CA 95320 (209)838-3507 • fax(209)838-3509 <br /> Engineering • Consulting Remediation • Construction <br />