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Y <br /> (f) The EA may require that an additional soil layer or building pad be placed on the final cover prior to <br /> construction to protect the integrity and function of the various layers of final cover. <br /> j (g)All on site construction within 1,000 feet of the boundary of any disposal area shall be designed and <br /> constructed in accordance with the following, or in accordance with an equivalent design which will <br /> prevent gas migration into the building, unless an exemption has been issued: <br /> 0)a geomembrane or equivalent system with low permeability to landfill -as shall be <br /> installed between the concrete floor slab of the building and subgrade; <br /> (2)a permeable layer of open graded material of clean aggregate with a minimum <br /> thickness of 12 inches shall be installed between the geomembran e and the subarade or <br /> slab; <br /> (3)a Reotextile filter shall be utilized to prevent the introduction of fines into the <br /> permeable layer; <br /> (4) perforated venting pipes shall be installed within the permeable layer, and shall be <br /> designed to operate without clogging- <br /> (5)the venting pipe shall be constructed with the ability to be connected to an induced <br /> draft exhaust system, <br /> (6)automatic methane gas sensors shall be installed within the permeable gas layer, and <br /> inside the building to trigger an audible alarm when methane gas concentrations are <br /> detected; and <br /> (7)periodic methane gas monitoring shall be conducted inside all buildin-s and <br /> underground utilities in accordance with Article 6. of Subchapter 4 of this chapter <br /> (section 20920 et seq.), <br /> Vote: <br />