SITE INFORMATION AND CORRESPONDENCE

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• The Honorable Patrick Johnston February 26, 1993 Page TGro to the Robertson residence. In addition, a carbon filter has been installed on Mr. 'Robertson's well, which, if properly maintained should remove any VOC contamination. The primary concerns voiced by Mr. Robertson and other residents relate to health impacts posed by VOCs in the ground water. With respect to Mr. Robertson 's concerns regarding the acute and chronic health risks posed to his children, studies conducted to date indicate that any potential health risks are minimal. A risk assessment was conducted for VOC contamination in the ground water and specifically addressed children as potential receptors. We would be happy to place Mr. Robertson or any member of the community in contact with a toxicologist or medical expert from the Department to discuss their health concerns. Mr. Robertson is further concerned by the risks associated from other exposure routes, such as ingestion of contaminated crops or drinking from contaminated wells. Crop studies conducted to date have indicated that there is no uptake of contamination from the ground water at Tracy. The remedial investigation has shown only one domestic and three agricultural wells have been affected. These wells are included as part of ODRW Tracy' s quarterly monitoring program. In the case of the domestic well , the residents have also been supplied by DDRW Tracy with bottled water. In his letter, Mr. Robertson had additional technical questions regarding the scope of the investigation. His letter questioned the emphasis of tracking the contamination in a northeasterly direction. Based on the direction of ground water flow and chemical concentrations, evaluation of the northeasterly plume proved to be the most sound use of resources available. Aerial photographs mentioned in his letter indicated features relating to surface water flow that may warrant investigating further to the east. It should be noted that surface features are not typically accurate in determining the direction of ground water flow. The Department suggests that Mr. Robertson consider raising additional technical issues at the newly formed Technical Review Committee, which was established as a forum for such concerns. During the remedial investigation, numerous interviews were conducted with past and current personnel at DDRW Tracy. The Department would be willing to conduct additional interviews with those persons Mr. Robertson refers to in his letter, if the information is provided to us.