Geotextile use for Landfill Gas Pressure Relief at the Boulevards at SouthBay (Former Cal Compact Landfill)

摘要

BAS has been the primary gas system designer for a multi-use development (commercial, retail, office, and residentialrndevelopment) to be constructed over a large closed landfill containing mostly municipal solid waste (MSW), located in thernCity of Carson, California. Structures are to be supported on piles to avoid landfill settlement-related distress. Deep dynamicrncompaction was completed to reduce settlement that could impact parking, walkways, small slabs on grade, and otherrnsurface features. The landfill will have a geomembrane cap (with overlying soil) or a low permeability soil cover installed tornprevent infiltration of liquids and control gas emissions. Landfill gas migration will be controlled with a multi-componentrnsystem composed of vertical and horizontal gas extraction wells, a geotextile placed beneath the geomembrane cap, therngeomembrane, a building protection system consisting of passive vents and a secondary geomembrane attached to allrnbuilding floor slabs. This paper describes the selection of the geotextile located below the main landfill cap geomembrane tornmeet two requirements:rn1. To prevent geomembrane "ballooning"; andrn2. To provide continued flow of the landfill gas during failure of the gas collection system.rnThe methodology is described and the calculations presented. Calculations utilized a published technique based on thernassumptions presented.