Laserfiche WebLink
PUBLIC HEALTH SERVICESgUIN <br /> ) <br /> pp, ... ' C <br /> .'c ''•O <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street a P. O. Box 388 a Stockton, CA 95201-0388 4�i'.bW <br /> 209/468.3420 <br /> Py <br /> KEN GILLIES <br /> GILLIES TRUCKING INC <br /> PO BOX 8303 <br /> STOCKTON CA 95208 MAY 2 5 199c <br /> RE: Gillies Trucking SITE CODE: 1703 <br /> 3931 Newton Road <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the first quarter 1995 quarterly monitoring report dated February 15, 1995 of sampling <br /> conducted on January 13, 1995 prepared by Upgradient Environmental Consultants for the above <br /> referenced site. PHS/EHD has also reviewed reports of all work to dated present in the <br /> PHS/EHD file for this site. <br /> The current report states that gradient is very flat with a difference of.01 feet between each well, <br /> however the gradient seems to be southerly, sampling is not recommended because the static <br /> groundwater elevation is above top of screen in all three wells and the change in contaminant <br /> levels in MW-1 may be due to contamination moving beyond this monitoring location. <br /> PHS/EHD concurs that gradient is difficult to determine at this site because all three wells appear <br /> to be on the same groundwater gradient contour. PHS/EHD recommends that sampling of the <br /> existing wells continue. The well casings should be dewatered to the point that a sample may <br /> be obtained when the water level in the casing is below top of screen. Additional wells should <br /> be screened at least five feet above highest anticipated 10 year seasonal groundwater elevation. <br /> PHS/EHD concurs with the finding of the report that the lateral and vertical extent of soil <br /> contamination and the lateral extent of the groundwater plume has not been determined at this <br /> time. The data from MW-1 indicates that the plume is migrating downgradient of this data point. <br /> In order to establish the downgradient extent of the plume an offsite well may be required. This <br /> is based on the current level of contamination in the wells and the position of the former UST <br /> location relative to gradient and the property boundary of the site. <br /> A Division of San Joaquin County Health Care Services <br />