SITE INFORMATION AND CORRESPONDENCE_CASE 1

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r i r • installation of a plastic, vertical collection sump designed to receive affected groundwater from the drain line. An experienced dewatering subcontractor will be recommended to assist in the layout and installation of the proposed system. Task 5.0 Establishment of a Soil Bioremediation Cell We propose to establish a cost-effective bioremediation cell in an area of Plant T which will be isolated from cannery vehicle traffic and stormwater runoff. For this Task we propose to remediate the following: • hydrocarbon affected soil volumes previously backfilled in the excavation(potential source soils); • hydrocarbon affected soil volumes generated during the installation of the subsurface drain system; • stockpiled soil volumes which presently disrupt the normal stormwater runoff pattern near the forklift shop. The bioremediation cell layout and estimated soil volumes would be described in the FRP. For this Task we will prepare an outline of instructions for TVG staff to implement the self monitoring and management of the bioremediation cell. We anticipate that PHS/EHD can be convinced of the merits of the self-managed bioremediation operation if SECOR performs limited verification monitoring in support of TVG's activities. Task 6.0 Installation of a Groundwater Treatment System This Task will involve the layout and installation of a treatment system for the removal of BTEX (primarily benzene)from extracted groundwater. The objective of this activity will be to minimize the typical system operation and maintenance costs, and utilize existing facility treatment systems, if appropriate. The removal of benzene may be enhanced with the application of biocatalysts in the effluent stream, or air sparging techniques. Permitting requirements will be addressed in the FRP. Task 7.0 Preparation of a-Closure Report Once the Site groundwater quality appears to have been adequately "remediated" (as monitored in water samples from well MW-4) following the requisite monitoring events, a request for regulatory closure would be submitted for PHS/EHD consideration. The Closure Report must be prepared in accordance with Tri Regional Guidelines, and will represent a comprehensive compilation of site data, investigation results and remediation findings. Depending on the complexity of the closure activities, the Site Closure Report may also be presented at a meeting of the San Joaquin County Technical Review Committee (TRC). The RWQCB will receive the closure recommendation from the TRC if all closure activities are deem completed. Tri ValleyGrO+ n SECOR• NI 130Y.rpt 5 June 1.1995