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SANJ O A Q U I N Environmental 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 /> nsubbotnikova(a-)sj og v.org, or Garrett Backus at(209) 468- 2986 or gbackus(a,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 /> LENNAR CITY OF TRACY <br /> CIO BRIDGIT KOLLER DEVELOPMENT SERVICES DEPARTMENT <br /> 2603 CAMINO RAMON SUITE 525 333 CIVIC CENTER PLAZA <br /> SAN RAMON CA 94583-9131 TRACY CA 95376-4059 <br /> Ci]Xr#: 9m I R y) noM CT-"T#: �TD� Igo oZ,�g8. <br /> C <br /> s << �oftat�q <br /> 1 2of2 <br />