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October 11, 2011 <br />Page 30 <br />• The underground development plan should be re- evaluated to ensure that operations will <br />not further damage the river bed alluvium. <br />A summary of subsidence control and monitoring plans for each of the aforementioned <br />structures is presented in Table 4. <br />Table 4. Summary of Subsidence Control and Monitoring Plan <br />Structure Class <br />Structure <br />Control Plan <br />Monitoring Period <br />Water line <br />Gas wells <br />No mining (development or retreat) within <br />Retreat operations within 40° <br />Gas Wells <br />Pump lack <br />150 ft <br />vertical offset mc,le <br />May be undermined (development or retreat) <br />Water disposal pit (lined) <br />No retreat operations within 10° vertical <br />Retreat operations within 40° <br />Gas Pipe: Buried in Sandy Soil <br />Gas line <br />offset angle <br />vertical offset angle <br />angle vertical offset angle <br />Gas valve <br />Solar panel <br />May be undermined (development or retreat) Retreat operations within 10° <br />(< 50 m) <br />Fuel gas valve <br />with no restrictions vertical nffset annle <br />School <br />Compressors /pumps <br />vertical offset angle <br />No retreat operations within 10° vertical <br />Retreat operations within 40° <br />Gas Pipe: Ancilliary Structures <br />Gas line drip <br />compressors /pumps /separators /transformers <br />with no restrictions vertical offset angle <br />Development mining only within vertical <br />Produced water tank <br />offset angle <br />vertical offset angle <br />Methanol tank <br />Gas blow -off valve <br />Water Pipe: Buried in Sandy <br />No retreat operations within 5° vertical offset Retreat operations within 10° <br />No specific measures required, as long as adjacent gas pipelines are protected <br />Soil /Clay <br />Water line <br />and monitored <br />Water discharge point <br />No specific measures required, as long as adjacent gas pipelines are protected <br />Water Pipe: Ancillary Structures <br />Water valve <br />and monitored <br />May be undermined (development or retreat) <br />Water disposal pit (lined) <br />No retreat operations within 5° vertical offset Retreat operations within 10° <br />Surface Water Body <br />with no restrictions <br />vertical offset angle <br />Water disposal pit (unlined) <br />angle vertical offset angle <br />TV /Radio Transmission Towers <br />Solar panel <br />May be undermined (development or retreat) Retreat operations within 10° <br />(< 50 m) <br />Scada tower /antenna <br />with no restrictions vertical nffset annle <br />School <br />Compressors /pumps <br />vertical offset angle <br />Structures on Metal <br />Soundproof metal housings for <br />Maybe undermined (development or retreat) Retreat operations within 10° <br />Skids /Footings <br />compressors /pumps /separators /transformers <br />with no restrictions vertical offset angle <br />Development mining only within vertical <br />Produced water tank <br />Methanol tank <br />Compressors /pumps <br />Structures on Concrete Soundproof metal housings for Maybe undermined (development or retreat) Retreat operations within 10° <br />Skids /Footings compressors /pumps /separators /transformers with no restrictions vertical offset angle <br />Meter house <br />Structures on Ground - Embedded Wellhead soundproof walls <br />No retreat operations within 5° vertical offset Retreat operations within 10° <br />Metal Columns <br />Electrical panel /meter <br />angle <br />vertical offset angle <br />Electrical outlet (power for well) <br />May be undermined (development or retreat) <br />Retreat operations within 10° <br />Roads <br />Unpaved roads <br />with no restrictions <br />vertical offset angle <br />Paved roads <br />Development mining only <br />Service life ofhighway <br />Church <br />No mining (development or retreat) within <br />Retreat operations within 25° <br />Brick and Masonry/Brick- <br />School <br />300 ft, horizontallly. <br />vertical offset angle <br />Bearing Walls /Low -Rise <br />Development operations within <br />Structures <br />House <br />Development mining only within vertical <br />10° vertical offset angle or <br />offset angle of 15° plus 30 ft <br />retreat operations within 25° <br />Frame house <br />Shed/pens <br />Development operations within <br />Green house <br />Development mining only within vertical <br />10° vertical offset angle or <br />Timber Frame Buildings <br />Garage <br />offset angle of 15° plus 30 ft <br />retreat operations within 251 <br />Bam <br />vertical offset angle <br />Log frame cabin <br />Agapito Associates, Inc. <br />