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1 <br /> 1 RKSMA <br /> Working To Restore Nature <br /> SUMMARY REPORT/ADDITIONAL SOIL AND <br /> GROUNDWATER INVESTIGATION <br /> ' RM Company, Incorporated <br /> 2431 East Mariposa Road <br /> Stockton, California <br /> 1 <br /> INTRODUCTION <br /> This report 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 Manposa Road, Stockton, California (Plate 1) <br /> 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 /> tanks used to contain diesel for company trucks These tanks are located near the facility <br /> lb 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 Plate 2 depicts the tank and piping locations relative to other facility features <br /> 1 <br /> GEOLOGY/HYDRO GEOLO GY <br /> The site is situated on level terrain The soils at the property have been mapped SbY the <br /> ' U S D A Soil Conservation Service as Jacktone Clay Jacktone clay is a fine-textured, dark <br /> gray to black clay, deposited by quiescent or slow moving water The parent material was of <br /> mixed ongin, but primarily igneous rock According to the survey, some in-place development <br /> ' of this soil has also occurred The development is a tight clay subsoil and is the result of <br /> transport and re-deposition of very fine particles from the top of the soil profile to the subsoil, <br /> 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 /> IPM U50066%REPORMSR-0894 FNL 1 <br /> 1 <br />