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rih <br /> oTATE OF CALIFORNIA - Environmental Protection A anay ' J PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Rouuer Road Suite A <br /> amenia CA 95827-3098 <br /> E (916) 255 3000 <br /> (916) 255 3015 <br /> 9 December 1994 <br /> Mr Jahn Welch <br /> Attorney at Law <br /> 2800 West March Lane, Suite 490 <br /> Stockton, CA 95219 <br /> PROPOSED ASSESSMENT OF SOIL AND GROUND WATER CONTAMINATION, <br /> INDEPENDENT TRUCKING FACILITY, STOCKTON, SAN JOAQUIN COUNTY <br /> 1 have reviewed the 7 November 1994 Site Contamination Work Plan for Ground Water lnvevigation <br /> subrillttLd by Will J Hunter & Associates on behalf of Mr William Miles and Ms Patricia Nolet, the <br /> owners of the property at 1 145 W Charter Way in Stockton A significant amount of soil excavation <br /> work has occurred at the site in conjunction with the closure of four underground petroleum storage tanks <br /> (US I s) Confirmation soil sampling showed that contaminated soils are still present in the subsurface <br /> Further remediation needs to be done to eliminate the threat these soils pose to ground water <br /> Your proposal to drill three soil borings and construct one ground water monitoring well is inadequate <br /> At least three ground water monitoring wells are needed in order to begin to define the lateral extent of <br /> ground A ater contamination and the ground water gradient Since the local gradient is generally towards <br /> *e east, at least one of the wells should be placed east (downgradient) of the open excavation The work <br /> ,,in stated that the property owners at 1045 W Charter Way, immediately to the east of the Independent <br /> I rucking site, "have requested permission to place one or more monitoring wells on the Independent <br /> 1)m.king Site in an attempt to define: the contain ination problem which exists beneath their property" It <br /> might be wise for you to coordinate your well installation requirements with the neighbor's activities <br /> Further investigation also is needed south of the old leach field excavation where gasoline and other <br /> petroleum constituents are in the soil column down to ground water Grab ground water samples from <br /> that area also showed containination with gasoline and volatile organic compounds <br /> By 6 January 1995, please submit an amended work plan to further remediate the soils associated with <br /> the former US I's, install at least three ground water monitoring wells at appropriate locations, and <br /> conduct further investigation near the old leach field All work plans should include schedules with <br /> particular calendar dates Please also submit a copy of the work plan to Ms Diane Hinson of the San <br /> Joaquin County Public Health Services <br /> If you have any questions or comments, feel free to call me at (916) 255-3077 <br /> RECEIVED ULU I <br /> JOEL M WEISS <br /> Engineering Geologist <br /> *4W <br /> i mw/lsb <br /> cc San Joaquin County Public Health Services, Stockton <br /> Mr Larry Bradfish, Gray, Cary, Ware & Freidenrich, Palo Alto <br />