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2 BACKGROUND Cove Contractors closed a landfill located 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. This plan described how groundwater monitoring and landfill gas monitoring were an integral part of the post-closure maintenance procedures. In addition to the correspondence regarding landfill closure, the RWQCB issued an Order to Submit Technical Reports on September 26, 2005 and Cleanup and Abatement Order No. R5- 2006-0707 (CAO) on April 27, 2006 that addressed groundwater monitoring activities. The Order to Submit Technical Reports required the preparation of a groundwater investigation workplan that included redevelopment of the site wells prior to sampling. The document entitled Groundwater Investigation Workplan was submitted on October 31, 2005 and was approved by the RWQCB in a letter dated December 2, 2005. The CAO required submittal of two quarters of groundwater monitoring data by August 1, 2006; however, significant rain events during early 2006 delayed groundwater sampling activities. Cove Contractors informed the RWQCB of the difficulties in accessing the site and rescheduled the submittal of the groundwater sampling report to November 13, 2006. The CAO also required submittal of a Groundwater Monitoring Well Installation Workplan (Clayton, June 1, 2006) to address the removal and replacement of monitoring wells MW-9 and MW-10. The workplan was submitted on May 31, 2006 and the RWQCB requested additional information in a letter dated August 11, 2006. The RWQCB comments were addressed in a letter dated August 18, 2006 and approved by the RWQCB in a letter dated August 22, 2006. The initial groundwater sampling events were conducted by Clayton Group Services (Clayton) in September and October 2006, prior to the onset of landfill capping activities. Due to the proposed placement of the landfill capping materials, Clayton abandoned monitoring wells MW-2, MW-3, MW-9, and MW-10 as discussed in the previous groundwater monitoring report titled Groundwater and Landfill Gas Sampling Third Event (Clayton, 2007). From January 23-26, 2007, Clayton provided oversight for the installation of three new groundwater monitoring wells, MW-2A, MW-3A, and MW-9A, outside the footprint of the landfill cap. Subsequently, from June 2006 through January 2007, Clayton conducted all monitoring and landfill capping activities. Beginning in May 2007, Miller Brooks continued all landfill capping and monitoring activities. 2 AWFLLER B/ DMAF P:\707 Cove Contractors\WDR\Tech Report and WP 2008\Tech Report and WP-FINAL.doc