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1JULlIILICII! C'Q},'C I Vl L TITLE 27. Environmental Protection Division 2. Solid Waste Subdivision 1 Consolydated Regulations for Treatment,,St®rage,__Processing or.Disposal..of,Solid W` Chapter 3._.Crite_ria for.All Waste,Manageme_nt Units,.Facilities,,,and Disposal Sites Subchapter 4. Criteria for Landfills and Disposal Sites Article 6. Gas Monitoring and Control at Active and Closed Disposal Sites §20920...C.WMB_- Scope and Applicability for"Gas Monitoring and Control Requirements During Closure and Postclosure.l NOTE NOTE Authority cited:Sections 40502 and 45020,Public Resources Code;and Section 66796.22(d),Government Code.Reference:Sections 43021 and 43103,Public Resources Code;and Section 66796.22(4), Government Code. HISTORY 1.New section filed 6-18-97;operative 7-18-97(Register 97,No.25). §20921. C A-Gas Monitoring and Control During Closure and Postclosure. (T14:§17783) • Note Hist®ry (a)To provide for the protection of public health and safety and the environment,the operator shall ensure that landfill gases generated at a disposal site are controlled in accordance with the following requirements: (1)The concentration of methane gas must not exceed 1.25%by volume in air within on-site structures. (2)The concentration of methane gas migrating from the landfill must not exceed 5%by volume in air at the facility property boundary or an alternative boundary approved in accordance with 2U Q925. (3) Trace gases shall be controlled to prevent adverse acute and chronic exposure to toxic and/or carcinogenic compounds. (b) The program implemented pursuant to §§20921 -20937 shall continue for a period of thirty (30)years or until the operator receives written authorization to discontinue by the EA with concurrence by the CIVVAM pursuant to 40 CFR 258.61(b). Authorization to cease gas monitoring and control shall be based on a demonstration by the operator that there is no potential for gas migration beyond the property boundary or into ori-site structures. Demonstration of this proposal shall be supported by data collected and any additional studies. (c)The gas monitoring program required pursuant to §§20921 _20937, shall be described as part of the preliminary and final postclosure maintenance plan. (d) Gas monitoring and control systems shall be modified, during the closure and postclosure maintenance period,to reflect changing on-site and adjacent land uses. Postclosure land use at the site shall not interfere with the function of gas monitoring and control systems. The operator may request a reduction of monitoring or control activities based upon the results of monitoring data collected. The request for reduction of monitoring or control activities shall be submitted in writing to the EA. http://ccr.oal.ca.gov/cgi-bin/om—isapi.dll?clientl]D=l 04287&infobase=ccr&softpage--Docu... 3/10/2005