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LiMuluclit • TITL9,97. Enviromwtall Protection Division 2.Solid Waste Subdivision 1.Consolidated Regulations for Treatment, erqq qAin� ,,.-g or Disposal of Solid Wi Chapter-1 t Q Ck t L!!J A,f Q r-All-W a s t 0-M aM A 9 9 LM 0 Vt M I I it; lllties,and DisposalSites Subchapter 4. Criteria for Landfills and PDJgpqjgLjb1 Article 6. Gas Monitoring and Control at Active and Closed Disposal Site §20923..,.C1 MR Mit—nitoring 4§17783t3) (a)To ensure that the conditions of§20921 are met the operator shall implement a gas monitoring program at the disposal site in accordance with the following requirements: (1)the gas monitoring network shall be designed by a registered civil engineer or a certified engineering geologist, and shall ensure detection of the presence of landfill gas migrating beyond the landfill property boundary and also into on-site structures; and (2)The monitoring network shall be designed to account for the following specific site characteristics and potential migration pathways or barriers, including,but not limited to: (A) local soil and rock conditions; (B)hydrogeological conditions at the disposal site; (C) locations of buildings and structures relative to the waste disposal area; (D)adjacent land use, and inhabitable structures within 1000 feet of the disposal site property boundary; (E)man-made pathways, such as underground construction;and (F)the nature and age of waste and its potential to generate landfill gas. NOTE Authority Cited:Sections 40502 and 45020,Public Resources Code;and Section 66796.22(d),Government Code.Reference:Sections 43201 and 43103,Public Resources Code;and Section 66796.22(d), Goverment Code. HISTORY 1.New section filed 6-18-97;operative 7-18-97(Register 97,No.25). §20925.C —Perimeter Monitoring Network. (T14:§17783.5) Note History (a)Location (1)Perimeter subsurface monitoring wells shall be installed around the waste deposit perimeter but not within refuse. The entire perimeter of the disposal site may not warrant the installation of monitoring wells. In this case, the operator shall demonstrate to the satisfaction of the EA that gas migration could not occur due to geologic barriers and that no inhabitable structure or other property such as agricultural lands within 1,000 feet of the property boundary are threatened by gas migration. (2)Perimeter monitoring wells shall be located at or near the disposal site property boundary. The operator may establish an alternate boundary closer to the waste deposit area based on a knowledge of the site factors in§2092-3(a)(2).When compliance levels are exceeded at the alternate boundary,the operator shall install additional monitoring wells closer to the property boundary,pursuant to §20937. http://ccr.oal.ca.gov/cgi-bin/om—isapi.dll?clientlD=104287&infobase=ccr&softpage=Docu .. 3/10/2005