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RVICES a4U,N <br /> PUBLIC tEALTH SE L,a�.�e2 <br /> PU SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor• Stockton, CA 95202 � ' A <br /> O <br /> 209/468-3420 <br /> PY <br /> Ken Gillies OCT 6 1998 <br /> Gillies Trucking <br /> PO Box 8303 <br /> Stockton CA 95208 <br /> Re: Gillies Trucking <br /> Site Code: 1703 <br /> 3931 Newton Rd. <br /> Stockton, CA 95208 <br /> This letter is to summarize the meeting attended by you, James Gillies, and staff members of San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHO) at our agency <br /> office on September 30, 1998. <br /> Depth to ground water was approximately 48 feet below surface grade (bsg)when last measured' <br /> in April 1998 by Upgradient Environmental. The groundwater is currently above the screen <br /> interval of all monitoring wells at the above referenced site. The analytical result of the water <br /> sample collected from GT-4 on August 16, 1996 was 1,730,000 parts per billion (ppb) Total <br /> Petroleum Hydrocarbons as diesel (TPH-d), and the analytical result of the soil sample collected <br /> on November 13, 1990 was 18,000 parts per million (ppm)TPH-d. There was also presence of <br /> aromatic hydrocarbon contamination in the soil samples collected from GT-1, GT-3, and GT-4, <br /> and in the water samples collected from GT-1 through GT-4. The deepest soil analytical data of <br /> the site was taken from GT-3 at 85 feet bsg. The vertical delineation of the contamination has not <br /> been completed. Historically depth to groundwater in the area has been as great as 120 feet bsg <br /> according to 1978 San Joaquin County Flood Control and Water Conservation District <br /> groundwater level survey. <br /> It was discussed that two additional monitoring wells, properly screened, are required in order to <br /> complete the vertical delineation of the contamination, to calculate the mass of the contamination, <br /> and to investigate the groundwater above the existing monitoring well screen intervals. A 2000 <br /> feet radius well and receptor survey will be conducted to evaluate potential risk to local <br /> groundwater supply. A fate and transport model will be constructed using soil physical property <br /> data(permeability, dry bulk density, porosity, moisture, and organic carbon content, at minimum) <br /> obtained during the above-mentioned monitoring well installation. <br /> If you have any questions, please feel free to contact Jeffrey Wong at(209)468-0335. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Jeffrey Wong , EHS, Trainee =rerLagono, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWCCB, Central Valley Region -Mark List <br /> c: Upgradient Environmental -Victor Cherven <br />