Laserfiche WebLink
PUBLIC HEALTH SEWICES <br /> SAN JOAQUIN COUNTY r. <br /> ENVIRONMENTAL HEALTH DIVISION y: <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 gt�FORd <br /> 209/468-3420 <br /> HENRY CECCHINI <br /> CECCHINI CECCHINI & GIOVANNONI <br /> 3000 E EIGHTEENTH ST RE G 0 5 1994 <br /> ANTIOCH CA 94509 <br /> RE : Delta Truck (former) SITE CODE : 1800 <br /> 3535 E. Cherokee Rd <br /> Stockton, CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS-EHD) has reviewed the "Workplan for Additional Site <br /> Investigation-Fueling Island Area" as submitted by ESE and has <br /> the following comments . <br /> The proposed location of the two monitoring wells does not <br /> adequately allow for data collection downgradient of the existing <br /> five (5) underground petroleum tanks at the east end of the <br /> island area. Groundwater gradient information collected over the <br /> many past quarters indicate that a north-northeasterly gradient <br /> exists beneath the site and your proposal does not include well <br /> placement in this area. PHS-EHD will require monitoring well (s) <br /> to be placed in areas that are downgradient of all sources of <br /> contamination known to be onsite . <br /> Construction details proposed for the two monitoring/vapor wells <br /> include the placement of 45 feet of screened interval . The <br /> proposal describes a possible soil vapor extraction test (SVE) if <br /> contamination is noted during well construction. PHS-EHD opposes <br /> the use of such a long screened interval and suggests that if the <br /> possibility of the SVE test are high, "nested" well construction <br /> be used instead to allow shorter screened intervals . This would <br /> allow the deeper casing to gather groundwater data while allowing <br /> the shorter casing to provide SVE information without "conning" <br /> the water in the saturated zone. Separate, single, non-nested <br /> wells are also an acceptable alternative. <br /> PHS-EHD feels that the proposed two well plan is inadequate and <br /> does not allow for data collection in all areas around known soil <br /> contamination. More wells will need to be placed now that will <br /> address these areas and conform to minimum investigative <br /> procedures . <br /> In conversations with Susan Wickham of ESE, I understand that a <br /> plan to remove the existing tanks, lines, and dispensers is in <br /> the making. Monitoring well UST-1 is centrally located within <br /> this area of proposed destruction and should it be removed, the <br /> A Division of San Joaquin County Health Care Services <br />