2012-09-06_REVISION - M2008070 (25)

Home Browse Search

Design and Operations Plan October 24, 2011 Western Gravel E & P Waste Disposal Facility Page 45 of 51 lower explosive limit (LEL). In the event that methane is measured at 25% LEL or above, all activities should cease, ignition sources should be extinguished, and all persons immediately leave the area. Operations should resume only when methane levels subside to 20% or less consistently, based upon periodic monitoring. VOCs should be monitored concurrent during methane monitoring activities. Elevated VOC levels can be toxic and are based upon the specific compound of interest. VOCs contained in E &P waste and PCS generally include benzene, toluene, ethylbenzene, and xylene (BTEX). The Occupational Health Administration (OSHA) regulates exposure to benzene with the b enzene standard provided in 29 Code of Federal Registry (CFR) 1910.1028. Levels of benzene are expected to be less than the OSHA action level of 0.5 parts per million (ppm). The permissible exposure limit (PEL) is 1.0 ppm for an 8 -hour time - weighted average exposure. In the event that VOC concentrations in air exceed background levels and are sustained at 5 ppm for one minute, all persons should leave the area until VOC levels subside to a consistent level of less than 5 ppm for a period of five minutes. It should be noted that weather conditions (e.g. humidity, moisture) can affect gas accumulation and dissipation. In the event that elevated methane and/or VOC levels do not subside, CDPHE shall immediately be notified. Monitoring equipment used is pr esented in Section 3.13. 4.9 FINANCIAL ASSURANCE Financial assurance must be maintained during the operating life and post - closure period of the landfill, in accordance with the Regulations. In accordance with Section 1.8.1 (B) of the regulations, the Owner will prepare a detailed written estimate of the cost of hiring a third party to close the "largest area requiring closure" during the active life of the facility when the extent and manner of its operation would make closure most expensive. Sixty days prior to receipt of any waste at this facility, a bond of sufficient amount will be established and maintained to make certain that payment of closure and post - closure activities will be made. The third party cost estimate will be prepared and updated every 5 years or as necessary based upon construction of new faculties and/or cells under the supervision of a Professional Engineer registered in Colorado. The fmancial assurance cost estimate will be revised annually based upon economic deflation values 'and submitted to CDPHE by October 1 of each year in accordance with the Regulations. 4.10 PERMITTING Required permits will be obtained from Rio Blanco County, State of Colorado, and Federal and local authorities in accordance with applicable regulations and ordinances. Several permits were previously obtained. Required permits include the following. • Rio Blanco County Special Use Permit and COD for landfill purposes. • CDPHE, APCD particulate (existing) and VOC emissions. • CDPHE Stormwater Discharge (existing). • Division of Reclamation, Mining, and Safety (existing reclamation permit must be amended) NWCC, Inc.