Title
Environmental Management Director requesting ratification of her signature on Change Order 031-PW-06/07-BOS, CCO No. 1 with D & E Construction to provide additional geotextile material for the Union Mine Landfill 13.6 Acre Final Closure project.
RECOMMENDED ACTION: Approve.
Body
BUDGET SUMMARY:
Total Estimated Cost $49,500
Funding
Budgeted $
New Funding $
Savings $
Other $
Total Funding Available $49,500
Change To Net County Cost $0.00
Fiscal Impact/Change to Net County Cost: Funding for the Change Order is available in the FY 2007-08 CSA #10 proposed budget. There is no cost to the General Fund.
Background:
The closure for the 15.8-acre Class III Old Landfill at the Union Mine Disposal Site specified by the California Valley Regional Water Quality Control Board, Central Valley Region (CVRWQCB) in new Waste Discharge Requirements Order No. R5-2006-0020 must be completed by August 15, 2007. As part of the Final Closure Plan, which was submitted to the CVRWQCB on March 30, 2006, it was identified that 13.6 acres of the 15.8-acre Class III Old Landfill Area will receive final cover in the year 2007. The remaining 2.2 acres are schedule to be closed in the year 2040, the projected closure date of the Class II active disposal area.
Reason for Recommendation:
This closure requires the use of geosynthetic products, specifically a linear low-density polyethylene geomembrane liner, geocomposite drainage net and non-woven geotextile. The geotextile material is designed for use between the pre-existing soil sub-grade and geomembrane liner in places that the soil sub-grade is either unstable or unsuitable to physically meet against the geomembrane liner. The existing soil sub-grade was placed on the Union Mine Landfill closure area in approximately 1995.
On March 13, 2007, the Board of Supervisors approved the bid documents to purchase and install the Geosynthetics for the Fina...
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