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i <br /> .PUBLIC 4EALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> r.� <br /> ENVIRONMENTAL HEALTH DIVISION z� <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 95?-04-0388 <br /> 2091468-3420 J <br /> MARY E SANCHEZ MAILED APR 18 199F <br /> 1633 W WALNUT STREET <br /> STOCKTON CA 95203 <br /> FORMER UNDERGROUND TANKS SITE CODE: 1844 <br /> 1876 Country CIub BIvd <br /> Stockton, CA. 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has <br /> reviewed the "First Quarter, 1996, Groundwater Monitoring Report", dated March 9, 1996 as <br /> submitted by your consultant, William Hunter, and has the following comments. <br /> PHS-EHD has always been concerned with this site's soil contamination in the areas of <br /> monitoring wells 1 and 3. The very Iow levels of soil contamination found differs greatly from <br /> the high levels of petroleum hydrocarbons found consistently in the groundwater at these same <br /> areas. <br /> To verify the existence of potential off-site sources, PHS-EHD required you to delineate the <br /> groundwater plume. Results of the recent off-site Geo-Probe investigation have indicated that a <br /> "zero-line" for the groundwater plume has been delineated and now indicates that no off-site <br /> source exists. <br /> The most recent groundwater gradient fluctuation is depicting both a north and south hydraulic <br /> gradient at the same time, emanating from an east-west.line through monitoring well 2. This <br /> latest gradient direction places you in a position of not having a down-gradient well from the <br /> most contaminated area on your site, and if this condition continues, will require additional <br /> well(s) to be installed. <br /> With depth to water levels approaching the top of the screened interval in monitoring wells 4 <br /> and 5 and over the screened interval in wells 1, 2, and 3, PHS-EHD has concerns that floating <br /> petroleum constituents cannot enter the casing and a true representation of the groundwater <br /> cannot be obtained. <br /> A Division of San Joaquin County Health Care Services <br />