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425 North Union Page 2 <br /> i <br /> The workplanproposed lan the installation of two monitoring wells. These wells should <br /> P <br /> provide further information regarding groundwater quality, as well as provide data <br /> necessary to determine the groundwater gradient of the site. The proposed placement of <br /> monitoring wells is greater than 80 feet-'from documented soil and groundwater <br /> contamination; and while the proposed;placement of wells will provide gradient <br /> determination, limited information regarding the boundaries of groundwater <br /> contamination may be obtained. <br /> The work plan indicated that soil samples would be collected everyfive feet during the <br /> installation of monitoring wells. The work plan did not indicate which soil samples <br /> collected would undergo analysis. PHS/EHD requests that samples undergo analysis at <br /> sufficient frequency to investigate documented soil contamination. <br /> PHS/EHD does not concur with the recommendation that after three quarters of <br /> groundwater monitoring with "ND" results the wells be destroyed. Insufficient <br /> information is available for PHS/EHD;-to evaluate the recommendation at this time. <br /> ti <br /> Please contact the City of Stockton, Building Division, to obtain a grading permit for the <br /> re-excavation. Please respond to PHS/EHD comments and submit;permit applications <br /> with associated agreements. Field work may commence once the appropriate permits <br /> have been obtained. , <br /> ES <br /> If you have any questions or comments, please contact Mary Meays, REHS$ of my staff . <br /> at (209) 468-0337. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer <br /> f <br /> Er <br /> ur' A. Cotulla, EHS, Program Manager <br /> En ironmental Health Division . <br /> LAC/MM:lb <br /> i <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Steve Furnas, WHF Environmental <br />