SITE INFORMATION AND CORRESPONDENCE

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STATE OF CALIFORNIA Environmental Protectiancy 1 PETE WILSON Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ovi 3443 Routier Road,Suite ASacramento,CA 95827-3098 PHONE:(916)255-3000 FAX:(916)255-3015 }7 6 July 1995 �11��I111 �IIII. 10 1995 ENVIRONMENTAL HEALTH PERMIT/SERVICES Ms. Diane Hinson, REHS, Supervisor Site Mitigation Unit Environmental Health Division Public Health Services San Joaquin County 304 E. Weber Ave. Stockton, CA 95201-0388 PROPOSED IRRIGATION WELL INSTALLATION, APN 252-040-05, 26101 S. CHRISMAN ROAD, TRACY, WEST OF DEFENSE DISTRIBUTION REGION WEST(DDR99 TRACY, SAN JOAQUIN COUNTY At the request of Mr. Dennis C. Noble, Attorney at Law, representing Mr. Anthony Traina, we have further reviewed the potential impacts to water quality posed by the proposed installation of an irrigation well on a 10 acre site west of, and adjacent to, DDRW Tracy. Based on the information provided in Mr. Noble's letter to the Board, dated 12 June 1995, we understand that this well is proposed to be constructed to a depth of 160 feet below ground surface, limited to the Upper Tulare Aquifer, and above the Corcoran Clay Zone. We further understand that Mr. Traina would be willing to, and capable of, limiting the pumping rates of the well. As you are aware, because of the close proximity of this 10 acre site to contaminants present in ground water and soil on DDRW Tracy property, we prefer that the proposed well be constructed in the Lower Tulare Aquifer and grout sealed into the Corcoran Clay Zone in order to prevent cross contamination within the Upper Tulare Aquifer and between the Upper Tulare Aquifer and the Lower Tulare Aquifer. However, because high costs are associated with the construction of this type of deep well, we do not object to construction of a well, initially, as proposed as long as well pumping does not impact DDRW Tracy's ability to effectively capture its contaminant ground water plume. However, if monitoring efforts by DDRW Tracy show that the ground water plume is drawn by the pumping of this new well, reduced pumping may be required, or an alternative water supply may need to be provided by DDRW Tracy. Enclosed is a memorandum which describes our technical concerns and recommendations in more detail. We also recommend that a meeting be held to address the concerns of all parties involved prior to issuance of a well permit for the proposed well. We have discussed this with Mr. Marshall Cloud, the