CORRESPONDENCE_2011 - Laserfiche WebLink

Home Browse Search

Ll n o The County to install at least three new groundwater monitoring wells northwest of wells MW -5 and MW -8 and northeast of NW -5. These new groundwater monitoring wells will likely need to be located outside of the County's property. In light of the Technical Order from the RWQCB, it is understood that: • It would be efficient for the closure cover over the County property and the State right-of-way property in a single project, and related environmental documents are prepared by a single entity. • The County, through the Department of Public Works Solid Waste Division, has expertise in landfill closure, and thus would be the appropriate entity to lead a single closure cap project. • The Caltrans right-of-way associated with the intersection of Corral Hollow Road and Interstate 580 includes locations that may be appropriate for the installation of groundwater monitoring wells. THEREFORE, IT IS AGREED that Caltrans and the County Department of Public Works will pursue the following course of action for the mutual benefit of the State and County: 1. Cooperation in a Combined Closure Project In the spirit of this understanding, the County will immediately proceed with design and regulatory documents for the closure of the two properties containing refuse. The County will task its consultant to design landfill closure that includes State property to be closed in one construction contract and administered by the County (Solid Waste Division of the Department of Public Works). The closure project is anticipated to include a moisture barrier using Geosynthetic Clay Liner as an Engineered Alternative to the prescriptive cover described in Title 27 of the California Code of Regulations. The project is also anticipated to include approximately two landfill gas collection wells attached to the existing landfill gas collection piping on County property. Control valves for these wells will also be on County property. The State will reimburse the County for the actual costs of constructing the closure cap that is proportionate to the total closure area and the area that is owned by the State, regardless of existing cost estimates. On this basis, reimbursement by the State would be approximately 15 percent of the total closure project cost. Reimbursable construction costs include all costs that are paid to entities outside the Solid Waste Division, including those paid to contractors, consultants, and to other Public Works Divisions as occurs in normal Public Works' projects. Reimbursable expenses do not include Solid Waste Division staff time. Reimbursements will be made on the basis of invoices sent to the County. The County may request reimbursement no more than once each month. Requests for reimbursement will include copies of the invoices. Memorandum of Understanding 2 State of California (Caltrans) Corral Hollow Landfill Closure and Related San Joaquin County (Department of Public Works) 13