Martin Park Landfill
BackgroundThe Martin Park Landfill operated from 1970 until 1974 and closed prior to the enactment of the state regulations that require solid waste disposal site owners and operators to establish a closure and post-closure funding process. These funding mechanisms are needed to ensure that uncontrolled release of gases do not pose safety or health concerns to the community. Excessive odor problems might also occur without gas control measures. After 1993, Federal regulations require monitoring of landfills 30 years after closure..
Project ScopeIn mid-2005, elevated methane concentrations were detected by several monitoring probes at the site. The City subsequently submitted a work plan to further investigate the extent of the gas problem, and began weekly monitoring of crawlspaces of several adjacent residences as a precautionary measure to ensure those homes were not at risk of high levels of methane gas. The City of San Jose requested a matching grant to bring the Martin Park Landfill site into compliance with current requirements. The estimated total project cost was $1.5 million and included the installation of a landfill gas interceptor trench and vapor barrier to prevent further off-site gas migration. The Local Enforcement Agency determined the proposed gas control system would be an effective and safe measure for the long-term protection of the community surrounding the landfill site and approved the City’s proposal. The California Integrated Waste Management Board, who provided the grant money is part of the California Environmental Protection Agency.
PerformanceTo prevent migration of the methane gases it was determined a barrier to the depth of 20’ below grade was needed. Due to limited workspace, trenching would not be an option. Also, due to the residential location of the site, heavy equipment and vibrations from installation were strictly limited. Engineers specified ShoreGuard 625 with an interlock sealant. The SG 625 has an I-Beam interlock system which ensures lock integrity during the driving process and optimizes the effectiveness of the sealant to provide the best possible effective permeability. The sheet piling material uses a proprietary resin matrix with enhanced chemical compatibility. ShoreGuard sheets have decades of proven performance when in contact with methane gas as well as benzene, creosote and jet fuel. As of 2011, the monitoring indicates that the wall is functioning as designed.
ConstructionThe sheet piling was driven using CMI patented PileClaw Installation technology. The PileClaw Mandrel was used to drive the sheets with an ABI Mobilram and vibratory hammer attachment. The hydraulically controlled vertical mast is fixed to a track mounted carrier and provides a much superior method of installation than a crane hung vibratory. The computer assisted driving process allows for careful and accurate placement of the sheets. Installation of over 100 feet per day was achieved and the project was completed well within the required time-frame.
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