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URS <br /> �'�tljIRONMf �d i AL HEALTH ' <br /> P?,7!nmit rRvict l <br /> I <br /> 03 FEB 10 AM 11: 2Z <br /> February 6, 2003 <br /> Mr. Jeffrey Wong <br /> San Joaquin Public Health Service <br /> Environmental Health Division <br /> 304 E. Weber Avenue,'Third Floor <br /> Stockton, California 95202 <br /> Re: Review Status <br /> Closure Request Addendum Report <br /> 1,2-DCA Investigation <br /> Former American Forest Products Facility <br /> 2801 West Lane,Stockton,California <br /> i <br /> URS Proiect No. 17322736 <br /> Dear Mr.Wong: <br /> The purpose of this .letter is to request a response regarding the status of the review by SanJoaquin <br /> County of the above-referenced closure request addendum report. That report was submitted in July <br /> 2002 following additional data collection downgradient of existing monitoring wells. The purpose of <br /> the investigation was to resolve a data gap with respect to 1,2-DCA, which has prevented site closure <br /> from being approved. <br /> Site closure was requested in 2001 by URS,based on data presented in our report titled Closure Request <br /> Report, Former American Forest Products 'Stockton Facility, and dated.July 31, 2001. That report <br /> compared site characteristics to California Regional Water Quality Control Board(RWQCB)criteria for <br /> designation as a "low risk groundwater site". Discussions with the RWQCB on February 14, 2002, <br /> indicated that the site-met the criteria for closure, with the exception of a data gap for the vertical and <br /> horizontal extent of 1,2-DCA in groundwater at locations downgradient from existing monitoring wells, <br /> and an update of water supply wells within 2000 feet of the plume. . <br /> The addendum report concluded that the plume is of limited extent, decreases in concentration with <br /> depth, and is not migrating downgradient. Based on an updated map of drinking water supply wells in <br /> the site vicinity, there are no wells with a potential to be affected by the plume, which is confined to an <br /> area within a radius of approximately 60 feet of the former source. <br /> t <br /> URS Group, Inc. <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tel:916.679.2000 <br /> Fax:916.679.2900 K:122736V020603.Joc <br /> Eq <br />