ARCHIVED REPORTS_2010 - Laserfiche WebLink

Home Browse Search

• Landfill gas collection system • Partial Cover of those surfaces of Module"I"that are not covered by the inter-Module barrier or final closure • Two groundwater monitoring wells This project was to be pursued in lieu of complete closure of Module "I". On July 20, 2004,the San Joaquin County Board of Supervisors approved a contract with Kleinfelder to design the Site Improvement Project. By February 2007, five years since VOCs were detected at MW-3, construction of the Site Improvement Project was substantially complete; however,the vegetation in the evapotranspirative (ET) closure was not well established. At that time, it was assumed that difficulty in growth was due to the failure of the Contractor to include fungus inoculants with the seed, as specified. This project also included a barrier between existing Module"I" refuse and new refuse that can be placed due to the presence of Module 1. At the direction of RWQCB staff, this barrier was an extension of the Module 1 liner with significant effort expended to ensure that the barrier over Module "I"refuse was gas-tight. In November 2007,the ET area was again reseeded,this time with fungus inoculants as specified. In the spring of 2008, it was determined that the seed growth remained insufficient for adequate ET cover. In November 2008, the closure cap soil was amended and fertilized, and again seeded. In the spring of 2009, vegetation was growing healthily on the ET cap area. On June 10,2009, CVRWQCB staff issued a notice of violation for discharge of wastes outside of containment. On March 4, 2009, San Joaquin County staff noticed that the landfill gas (LFG) condensate pump discharge was connected to the secondary leachate sump of Module 1. In April 2009, the LFG condensate was removed from the secondary sump, and the soil gas trench (installed beneath the liner of Module 1)was activated to enhance the protection of groundwater. An investigation in October 2009 indicated that the condensate had been forced between the primary and secondary liner up the side of the landfill, and had been discharged into the anchor trench along the side of the landfill where the primary and secondary liners terminate. Monitoring of the secondary sump, and removal of condensate remaining in the secondary sump as it becomes available to pump, continues on a monthly basis. Foothill Sanitary Landfill 4 Department of Public Works/Solid Waste 1"Semester 2010 Groundwater Monitoring County of San Joaquin—July 21,2010