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SANJ O A Q U I N EnvoronmenW Health Department <br /> COUNTY <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 geomembrane and the subgrade <br /> or slab . <br /> (3 ) a geotextile 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 buildings and <br /> underground utilities in accordance with Article 6 , of Subchapter 4 of this chapter <br /> (section 20920 et seq. ) . <br /> The EHD believes that, although Section 21190 does not strictly apply to the development, that following <br /> these recommendations will protect public health and safety and prevent the safety concerns and threat <br /> of damage to structures, roads, and utilities from gases . <br /> If you have any questions , please contact Natalia Subbotnikova at (209) 468 -0338 or <br /> nsubbotniko,,ggsj og v org, or Garrett Backus at (209) 468 - 2986 or gbackus e ,sj og v.org_. <br /> Jasjit Kang, Directo , HS <br /> San Joaquin County Environmental Health Department <br /> Cc : City of Tracy Development Services Department, 333 Civic Center Plaza, Tracy, CA 95376 <br /> 2of2 <br />