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I <br /> HEALTH SER�CES <br /> PUBLIC � Pa�,N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 <br /> 209/468-34200 <br /> 3 u <br /> Mr. KEN GILLIES <br /> GILLIES TRUCKING <br /> PO BOX 8303 <br /> STOCKTON CA 95208 <br /> RE: Gillies Trucking SITE CODE: 1703 <br /> San Joaquin County Public Health Services Environmental Health Division <br /> (PHS/EHD) has reviewed the October 31, 1996 Problem Assessment Report <br /> and the December 28, 1996 quarterly monitoring report prepared by Upgradient <br /> Environmental Consultants for the above referenced site. <br /> PHS/EHD has determined that the investigation phase is complete. Currently <br /> available data indicates that the lateral and vertical extent of the soil and <br /> groundwater plumes have been defined. The groundwater plume boundary has <br /> been roughly defined as the area bounded by GT-5, GT-6 and GT-9 and GT-2. <br /> Two domestic wells are located approximately 86 feet north of the plume (Gillies <br /> domestic well) and 111 feet east of the plume (Barbot domestic well). Both wells <br /> appear to be down gradient of the plume. <br /> Water samples from the drinking water wells do not indicate the presence of <br /> petroleum hydrocarbons. The well log of the domestic well installed at the Barbot <br /> property indicates that the depth of the well seal is to 115 feet and reports a clay <br /> layer from 86 to 124 feet. Although it appears to provide some protection to this <br /> drinking water well, the clay layer at the Barbot property is probably <br /> discontinuous. The construction of the domestic well at the Gillies site is <br /> unknown. There is a potential for these two wells to become impacted in the near <br /> future. <br /> The amount of diesel in the soil plume is estimated to be approximately 2500 <br /> gallons. The amount of gasoline and benzene was not calculated. The residual <br /> soil contamination may add to the load of hydrocarbons in the groundwater <br /> plume, especially considering the sandy soil beneath the site. An investigation of <br /> the amount of hydrocarbon degrading bacteria indicates that natural attenuation <br /> is not occurring at a measurable rate. <br /> A Division of San Joaquin County Health Care Services <br />