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PUBLIC FMALTH SERVI <br /> SES oA.,... <br /> COPY <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> EDWARD NIEMANN MAR 0 9 2001 <br /> 8709 N DAVIS RD <br /> STOCKTON CA 95209 <br /> RE: North Stockton Auto Service SITE CODE: 0786 <br /> 8709 N. Davis Rd. <br /> Stockton CA 95209 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Additional Subsurface Investigation Report— Soil and Groundwater <br /> Sampling" dated January 29, 2001 that was submitted by Ground Zero Analysis, Inc. on <br /> behalf of the above referenced site and has the following comments. <br /> The report documents site fieldwork that took place on January 21, 2001, when one soil <br /> boring was advanced for the purpose of collecting a grab groundwater sample for <br /> analysis. This was the final phase of work necessary to complete all proposed and <br /> approved elements of the "Work Plan for Subsurface Investigation" dated July 20, 2000. <br /> Earlier phases of work had identified petroleum hydrocarbon contamination in soil at 10- <br /> feet below surface grade in the area of the former waste oil tank pit. An over excavation <br /> of the former tank pit was performed on November 8, 2000. Analytical results of soil <br /> samples collected from the bottom and sides of the excavation were non-detect for all <br /> petroleum hydrocarbon constituents analyzed, indicating that the bulk of the impacted <br /> soil had been removed. <br /> Analytical results from the grab water sample collected on January 21, 2001 were <br /> positive for several volatile organic compounds, including 17 micrograms/liter(µg11) 1,1- <br /> dichloroethane, 10 µg/l cis-1,2-dichloroethene, 4.4 ttg/l tetrachloroethylene and 16 µg/l <br /> trichloroethane. Please prepare a work plan to define the vertical and lateral extent of <br /> this documented contamination. The work plan should include the installation of at least <br /> three groundwater monitoring wells and a sensitive receptor/well survey that documents <br /> the location of all domestic, municipal, agricultural, industrial or other wells located within <br /> a 2000-foot radius of the source area. If you have any questions or comments please / <br /> call Lori Duncan at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS Dot lLofstrom, RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> Greg Stahl, Ground Zero Analysis, Inc. <br /> A Division of San Joaquin County Health Care Services <br />