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Working To Restore Nature <br /> 1710 Main Street WORKPLAN FOR ADDITIONAL SOIL AND <br /> Escalon, CA 953.20 GROUNDWATER INVESTIGATION <br /> Phone (209) 838-3507 <br /> l FAX (209) 838-3509 BJJ Company, Incorporated <br /> l 2431 East Mariposa Road <br /> Stockton, California <br /> 1 <br /> INTRODUCTION <br /> l This workplan is being submitted to San Joaquin County Public Health Services, Environmental <br /> Health Division to further define the petroleum hydrocarbon impact to soils and groundwater at <br /> 2431 East Mariposa Road, Stockton, California (Figure 1) <br /> l BJJ Company, Inc operates a truck terminal facility at the subject site Three underground fuel <br /> storage tanks are maintained at the facility Two of the tanks are newly installed double walled <br /> l tanks used to contain diesel for company trucks These tanks are located near the facility <br /> entrance The other tank is a 3500 gallon underground tank located partially beneath one of the <br /> maintenance buildings Due to the location of the tank, BJJ Company, Inc requested and <br /> received conditional approval for in-place abandonment from the Montezuma Fire Protection <br /> District Figure 2 depicts the tank and piping locations relative to other facility features <br /> GEOLOGY/HYDROGEOLOGY <br /> The site is situated on level terrain The soils at the property have been mapped by the <br /> U S D A Soil Conservation Service as Stockton Clay (adobe) Stockton clay is a fine-textured, <br /> dark gray to black clay, deposited by quiescent or slow moving water The parent material was <br /> of mixed origin, but primarily igneous rock According to the survey, some in-place <br /> development of this soil has also occurred The development is a tight clay subsoil and is the <br /> result of transport and re-deposition of very fine particles from the top of the soil profile to the <br /> subsoil, resulting in a high colloidal clay content and impervious structure in the subsoil <br /> Deeper lithology and site geology is related to the surface soils The site is mapped by the U S <br /> Geological Survey as "basin deposits " Basin deposits have lithologic profiles dominated by <br /> fine-textured materials However, intercalating layers of coarser textured materials are common <br /> and usually capable of freely releasing water Municipal water wells drilled in the general area <br /> penetrate through alternating clays and sands to a depth of 250 feet or more before intentionally <br /> ( extracting water <br /> „ M%150066%RCPORTSIWP-0794 FNL 1 <br /> L <br />