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Vocument rage 1 01 TITLE 27, Environmental Protection Division 2.Solid Waste Subdivision 1. ConsolWatp RqgMjgtions for Treatment.Storage, Processing-qr,psposal of Solid W, ........... Chapter 3L0rjjtqrla for All Waste Manaqpjment Units,-F pilities......and.....Disposal Sites --1-...--. ... SjLbch-Aptqr 4. Criteria for Landfills and Disposal Sites Article 6. Gas Monitoring and Control at Active and Closed Disposal Sites §2®919 QV Mj3_7,QasControI.,(Tj - 77Q5) NOTi L NOTE Authority cited:Section 40502,Public Resources Code.Reference:Sections 43020,43021 and 43103, Public Resources Code. HISTORY 1.New section filed 6-18-97;operative 7-18-97(Register 97,No.25). §20919.5. CIWNM--Explosive Gases Control. (T14:§17258.23) • Note History (a) Owners or operators of all MSWLF units must ensure that: (1)The concentration of methane gas generated by the facility does not exceed 25 percent of the lower explosive limit for methane in facility structures (excluding gas control or recovery system components); and (2) The concentration of methane gas does not exceed the lower explosive limit for methane at the facility property boundary. (b) Owners or operators of all MSWLF units must implement a routine methane monitoring program to ensure that the standards of J(a) are met. (1)The type and frequency of monitoring must be determined based on the following factors: (i)soil conditions; (ii) the hydrogeologic conditions surrounding the facility: (iii)the hydraulic conditions surrounding the facility; and (iv)the location of facility structures and property boundaries. (2)Except as provided in T(f), the minimum frequency of monitoring shall be quarterly. (c) If methane gas levels exceeding the limits specified in 1(a) are detected,the owner or operator must: (1) immediately take all necessary steps to ensure protection of human health and notify the EA; (2)within seven days of detection,place in the operating record the methane gas levels detected and a description of the steps taken to protect human health; and (3)within 60 days of detection,implement a remediation plan for the methane gas releases,place a copy of the plan in the operating record, and notify the EA that the plan has been implemented. The plan shall describe the nature and extent of the problem and the proposed remedy. (4)The EA with concurrence by the CIWM-B pursuant to 40 CFR 258.23(c)(4)may establish alternative schedules for demonstrating compliance with T(c)(2) and 1(c)(3). (d)For purposes of this section,"lower explosive limit"means the lowest percent by volume of a http://ccr.oal.ca.gov/cgi-bin/om—isapi.dll?clientlD=104287&infobase--ecr&softpage=Doeu... 3/10/2005