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p <br /> � <br /> ♦ IT ^ <br /> URS <br /> A PROFESSIONAL SERVICES ORGANIZATION <br /> URS CONSULTANTS OFFICES I <br /> W YORK <br /> 2710 GATEWAY OAKS DRIVE;;SUITE�250 NORTH SSEATTLLEANCISCO CLEVELLAND <br /> SACRAMENTO,CALIFORNIA 95834 DENVER COLUMBuS <br /> SANTA BARBARA PARAMUS <br /> TEL:(916)929-2346 COLORADO SPRINGS AKRON <br /> SACRAMENTO BUFFALO <br /> PORTLAND NEW.ORLEANS <br /> ANCHORAGE ATLANTA <br /> f SAN BERNARDINO BOSTON <br /> r LONG BEACH VIRGINIA BEACH <br />`rl PHOENIX SAN ANTONIO <br /> ` LAS VEGAS PITTSBURGH <br /> July 25, 1989 <br /> JUL 261989 <br /> Ms. Diane Hinson <br /> San Joaquin County Public Health Services <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201 <br /> RE: Union Ice Groundwater Investigation <br /> Response to County Comments Regarding URS's Workplan <br /> Dear Ms. Hinson: <br /> This letter is being submitted in response to your office's comments (County letter dated 3 July <br /> 1989) regarding the URS Groundwater Investigation Workplan:'for the Union Ice Company I <br /> facility (Union Ice) in Stockton, California. <br /> I <br /> The following sections comprise our response to each of your office's comment. <br /> IE Comment: 1. URS Consultants should evaluate the possibility of water Ievel fluctuation Al <br /> to ensure that water levels will not fall below or rise above the screen <br /> intervals suggested in the workplan. it Wefurther suggest that URS <br /> Consultants review the McCormick & Baxter reports to determine proposed <br /> depths of deep and shallow monitoring wells. <br /> Response: Based on communication with Mr. Gary Reents of the Regional Water <br /> Quality Control Board and review of reports for the adjacent McCormick & <br /> Baxter site (CH22MHILL Summary Report dated September 1986 and Offsite <br /> Wells Workplanll ask 1 Report dated May 1989),;,groundwater levels fluctuate <br /> approximately plus-or-minus 2 to 3 feet during the year and are. not <br /> significantly influenced by tidal fluctuations.;,Therefore, placement of the <br /> proposed well screens with five feet above and below the water surface (as <br /> recommended in the workplan) will ailo;w shallow wells to be useable. As f <br /> for well completion depths,determination of the depths of the shallow wells <br />€ was based on the noted presence of groundwater in the tank excavation (at <br /> a depth of approximately 10 to 121eet) .during tank pulling activities. <br /> 0 <br /> Although groundwater elevation data is available for the McCormick & <br /> Baxter (M & B) site, groundwater system.'characteristics of the two sites are <br /> different; making use of most of the.M&','B site'phydrologic data impractical. <br /> The Union Ice site and M & B site are separated by Mormon Slough, a zone <br /> Ilf of groundwater recharge (.Gary Reents �RWQCB Personal Communication <br /> i <br /> 65550.01/07249fUnionIce.giw 1 <br />