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LEA Advisory 20 Attachment- Inspection Guidance for SW Landfills Page 48 of 52 (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) The minimum frequency of monitoring shrill be quarterly. (c) If methane gas levels exceeding the limits specified in paragraph (a) of this section are detected, the owner or operator must: (I) Immediately take all necessary steps to ensure protection of human health and notify the board. (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 board that the plan has been implemented. The plan shall describe the nature and extent of the problem and the proposed remedy. (4) The board may establish alternative schedules for demonstrating compliance with paragraphs (e)(2)and(3) of this section. (d) For purposes of this section, "lower explosive limit"means the lowest percent by volume of a mixture of explosive gases in air that will propagate aflame at 25 degrees Celsius and atmospheric pressure. Actions required by the operator are stated in the regulation. The methane gas monitoring program should be approved by the LEA. Board staff may be contacted for assistance in reviewing the program. The LEA should evaluate this standard at active solid waste landfills by doing the following: 1) use a combustible gas indicator to measure methane levels in appropriate gas probes and barholes on a monthly basis, or 2) oversee the operator's quarterly monitoring by observing the monitoring, verifying a representative portion of the operator's findings with LEA gas monitoring instrumentation, and documenting the date of the monitoring and any findings, on a SWIS inspection report to the Board Enforcement Branch contact. Actions taken at disposal sites in the past to mitigate gas problems include the following: installation of landfill gas monitoring systems approved by the LEA and/or the Board, installation of landfill gas control systems, installation of structural gas control systems, sealing floor cracks of on-site structures, improving ventilation, and removal of the structure. Landfill gas may contain potentially harmful trace constituents. See Appendix L for a listingoof prevalent trace.gases from Class III municipal solid waste landfills. Chronic exposure to these constituents may result in health problems. http://www.clwmb.ca.gov/pe/advisory/20/attach2O/20attcli l. itm 8/11/98