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STATE OF CALIFORNIA—HEALTH AND WELFARE AGENCY GEORGE DEUKMEJIAN, Go"., <br /> DEPARTMENT OF HEALTH SERVICES <br /> TOXIC SUBSTANCES CONTROL DIVISION <br /> REGION 1 <br /> 4250 POWER INN ROAD <br /> SACRAMENTO,CA 95826 <br /> (916)7393145 August 18, 1989 <br /> Fred J. Burkett, Ltc <br /> Director of Installation Services <br /> Defense Depot Tracy <br /> 25600 South Chrisman Rd. <br /> Tracy, CA 95367-5000 E%1"R0,%UjENTAJ - <br /> Dear Colonel Burkett: <br /> INTERIM GROUNDWATER WITHDRAWAL, TREATMENT, AND DISPOSAL SYSTEM; <br /> STATEMENT OF WORK FOR DEFENSE DEPOT TRACY <br /> The enclosed memorandum relays the Department of Health Services' <br /> (Department) concurrence and comments regarding the revised <br /> interim groundwater treatment system. We appreciate the efforts <br /> of your staff and contractors to incorporate the concerns of the <br /> Department and the California Regional Water Quality Control <br /> Board into the modified statement of work. <br /> The Department has reviewed the scope of work proposed for the <br /> first phase. We agree with the selection of five extraction <br /> wells and three injection wells for the initial phase. We also <br /> agree with the inclusion of additional monitoring wells to <br /> evaluate the interim systems' performance and provide data for <br /> feedback into the groundwater model. The use of a phased <br /> approach along with the additional monitoring will provide data <br /> useful to the final remedy and allow the optimum placement of <br /> additional treatment system wells. <br /> The attached comments are limited to specific technical and <br /> procedural recommendations. They focus primarily on well <br /> construction techniques and the Departments' oversight concerns. <br /> We look forward to working with your staff during the development <br /> and implementation of the interim groundwater treatment system. <br /> Should you have any questions, please call Jim Pinasco of my <br /> staff at (916) 924-2154 . <br /> Sincerely, <br /> 1 'a " P. . <br /> David Wang, P <br /> Senior Waste Management Engineer <br /> Enclosure <br /> cc: See next page. <br />