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{ ♦ \ ,aU vFF r s 7 Y y ,Y&2� Mr. Victor Izzo Page 2 of 5 RWQCB — Central Valley Region Clayton Project No. 80-03242.00.500 May 31, 2006 Cove Contractors is in the process of closing the landfill at the site under the oversight of the California Integrated Waste Management Board (CIWMB) and the California Regional Water Quality Control Board — Central Valley Region (RWQCB). The document entitled Revised Landfill Closure and Post -Closure Maintenance Plan (Clayton, January 16, 2006) was approved by the RWQCB in a letter dated February 16, 2006. Placement of the landfill cover components described in the closure plan will necessitate relocating wells MW -9 and MW -10. The following discussion presents the protocols for destruction of the existing wells and construction of new wells. Submittal of this plan is a requirement of the Cleanup and Abatement Order (CAO) issued for the site by the RWQCB. PROPOSED FIELD ACTIVITIES Well Abandonment Two monitoring wells, MW -9 and MW -10, are currently located along the northern perimeter of the site boundary. The placement of the landfill cap is proposed to extend into the location of where these monitoring wells currently exist. Therefore, both wells will need to be abandoned. The locations of the two replacement wells will be based on the results of the initial groundwater investigation, the procedures for which are presented in the document titled Groundwater Investigation Workplan, Cove Contractors — 3242 South El Dorado Street, Stockton, California (Clayton, 2005) and summarized below for convenience. However, the preferred locations of the replacement wells would be just north of the site boundary east of Universal Recycling Services, off the waste footprint or perimeter of the cap area. Figure 2 illustrates the current location of MW -9 and MW -10 in addition to the proposed location of the replacement monitoring wells. Monitoring wells MW -9 and MW -10 will be abandoned under permit from the San Joaquin County Environmental Health Department, in accordance with the California Department of Water Resources Bulletin 74-81, Water Well Standards: State of California and its supplement Bulletin 74-90, California Well Standards. In addition, destruction of groundwater monitoring wells will be conducted in accordance with Clayton SOP -10, Destruction of Monitoring Wells (attached). Well Installation and Monitoring As previously mentioned, the locations for the final replacement wells will be determined based on the results from the initial groundwater monitoring investigation. However, the preferred locations would be off the waste footprint on the perimeter of the cap area just north of the site S:\ES\Proj\P03242\Groundwater\Workplan 2006\GW_installation and abandonment_WPL_FINAL.doc