CORRESPONDENCE_2005-2007 - Laserfiche WebLink

Home Browse Search

Section: 20950 - 21430. Article 1 - 4. Subahapter 5. Chapter 3. Title 27. California ode of Regulations. Page 2 of 2 in accordance with the following, or in accordance with an equivalent design which will prevent gas migration into the building, unless an exemption has been issued: (1) a geomembrane or equivalent system with low permeability to landfill gas shall be installed between the concrete floor slab of the building and subgrade; (2) a permeable layer of open graded material of clean aggregate with a minimum thickness of 12 inches shall be installed between the geomembrane and the subgrade or slab; (3) a geotextile filter shall be utilized to prevent the introduction of fines into the permeable,layer; (4) perforated venting pipes shall be installed within the permeable layer, and shall be designed to operate without clogging; (5) the venting pipe shall be constructed with the ability to be connected to an induced draft exhaust system; (6) automatic methane gas sensors shall be installed within the permeable gas layer, and inside the building to trigger an audible alarm when methane gas concentrations are detected; and (7) periodic methane gas monitoring shall be conducted inside all buildings and underground utilities in accordance with Article 6, of Subchapter 4 of this chapter (section 20920 et seq.). Note: Authority cited: Sections 40502 and 43020, Public Resources Code and Section 66796.22(d),Government Code. Reference: Sections 43021,43103 and 44105, Public Resources Code,and Section 66796.22(d), Government Code. http://www.ciwmb.ca.gov/Regulations/Title27/ch3sb5.htm 6/9/2006