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, L <br /> PUBLIC TIEALTH SERNaCES <br /> SAN JOAQUIN COUNTY �. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer • o;., � ' <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> COPY <br /> CHARLES SKOBRAK <br /> 9947 EAST HIGHWAY 26 <br /> STOCKTON CA 95205 MAY1 Q 1994 <br /> RE: 308 N. Grant SITE CODE: 1122 <br /> Stockton, California <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/END) has completed the review <br /> of the "Quarterly Report: Monitoring Well and Soil Boring Installation and Sampling" dated April 18, 1994 <br /> and has the following comments. <br /> The data gathered from the latest phase of field work shows soil and groundwater contamination around both <br /> former tank pit areas. Additional soil borings/monitoring wells mist be installed to fully define both the <br /> soil and groundwater contaminant plumes. <br /> The report recommends three additional slant borings, two near tank pit A and one near tank pit B and C. <br /> PHS/EHD recommends, in addition to these soil borings, additional soil borings, as needed, to fully assess <br /> the soil contaminant plumes in and around both tank pit areas. The soil borings mist adequately define the <br /> soil lithology, the contaminant concentrations and the distribution of the contaminants in the subsurface. <br /> Sufficient information is needed to determine appropriate cleanup alternative(s) for this site. <br /> In addition, you may want to install vapor extraction test wells in areas found to be significantly impacted <br /> with petroleum hydrocarbons. These wells should be used for feasibility testing. Feasibility studies are <br /> required to gather data for evaluating the efficiency and cost of remedial alternatives for the site. <br /> The report recommends several additional monitoring wells to further define the groundwater contaminant <br /> plume(s). In addition to those wells mentioned in the report, PHS/END recommends the installation of an <br /> additional well inside the warehouse located directly to the north of monitoring well MW#4. There appears <br /> to be sufficient room in the warehouse to accommodate a small drill rig. This well is needed to define and <br /> monitor the groundwater contaminant plume in the established downgradient direction. You may also wish to <br /> install additional soil borings in this area, if needed, to adequately define the soil contaminant plume. <br /> In addition, PNS/EHD recommends the installation of a monitoring well upgradient of tank pit B and C to <br /> further define this groundwater plume. <br /> If you have any questions or wish to discuss this Letter in more detail, please call me at (209) 468-3441. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Linda Turkatte, Senior RENS Di OEM,�REHS <br /> Site Mitigation Unit Supervisor <br /> LT <br /> c: CVRWQCB- Beth Thayer <br /> c: SWRCB-Susan Phillips <br /> c: Kevin Berkemeier <br /> c: Geological Audit Services-Faith Morris-Daverin <br /> A Division of San Joaquin County Health Care Services <br />