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i <br /> <br />Section - 2.05.4 <br />geologic zones. Further, gob vent boreholes are not completed in any alluvial/colluvial water bearing <br />zone. <br />The inside of the steel casing will be sealed by placing a minimum of 50 foot of cement sealant from <br />at least 50 feet below ground surface to within 3 feet of the ground surface. To support the 50 foot <br />cement sealant, cuttings, gravel, a suitable inflatable packer, bridge plug or other mechanical plug will <br />be installed for the purpose of supporting the minimum 50 foot of cement sealant. Any casing <br />extending above the ground surface will be cut off and the hole location marked after reclamation is <br />completed. This sealing method will prevent methane migration through the inside of the cased <br />borehole and prevent methane migration to surrounding strata from the borehole. <br />In cases where the steel casing integrity has been compromised and jeopardizes the installation of the <br />minimum 50 foot plug an alternate plan will be implemented. <br />If groundwater is encountered during drilling and installation of gob vent boreholes, then boreholes <br />at these locations will be sealed using cement or other suitable sealant by placing the sealant inside the <br />steel casing from as close to the bottom of the casing as possible to within 3 feet of the ground <br />surface. <br />Following plugging and sealing of any drillholes or boreholes, OMLLC will file an abandonment <br />report within 60 days identifying the mapped hole location, hole depth, collar elevation, intervals <br />where water was encountered, hole diameter, type and amount of sealant used, sealing method, and <br />the name and license number of the driller and rig involved in sealing the hole(s). <br />Compliance with Clean Air Act. Clean Water Act, and Other Applicable Air, Water, and <br />Health and Safety Standards and Regulations <br />OMLLC's ongoing and future mining, reclamation, and related operations have been designed and <br />are conducted to effect full compliance with all applicable air quality, water quality, environmental <br />TR-66 <br />2.05-69b Revised Mar. 2010