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WORK PLAN FOR GROUNDWATER TREATMENT SYSTEM UPGRADE a a 'BP Oil Company Service Station No. 11194 b 2375 Tracy Boulevard Tracy; California - Project.No. 10-085-03=001- October 15, 1993 INTRODUCTION This work plan presents the scope of work to upgrade the existing groundwater treatment system at BP Oil Company.Service Station No. 11194, located at 2375 Tracy Boulevard, Tracy, . California. A site vicinity map and site pian are shown.in Figures'1 and 2., SCOPE-OF WORK The scope of work includes: (1) acquiring permits; (2) destroying groundwater Monitoring Well MW-3 and installing a 4-inch-diameter,recovery well in its place';.(3) developing and surveying the recovery well; (4) connecting the new recovery well to the existing groundwater treatment system; and (5) submitting well construction data to the appropriate agencies. The proposed scope of work will be conducted in accordance with the guidelines and requirements of the San Joaquin County Public Health Services (SJCPHS)-and the California Regional Water Quality Control Board, Central.Valley Region. Task 1: Acquire•Permits' Before beginning the work, Alisto Engineering Group will acquire the necessary drilling and groundwater monitoring well installation permits, and schedule field 'activities with the appropriate agencies. - Task 2: Destroy and Replace Monitoring Well MW-3 The hydraulic conductivity of the 2-inch-diameter Monitoring Well.MW-3 is relatively high, as evidenced by pump test data and a groundwater treatment system performance evaluation. Monitoring Well MW-3 w-ill.be destroyed.and replaced with a 4-inch-diameter recovery well for extraction purposes. The effectiveness of the groundwater treatment system will be increased by utilizing the. . relatively high,conductivity of the soil in the immediate vicinity of MW-3. E:\0\14-085\10-05.WP/101493,