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7. <br />all excavation activities (including drilling) that require the evaluation of <br />the gas collection system drawings prior to the commencement of <br />activities. <br />k. All above-ground components of the methane gas collection system on <br />Lot 14 shall be protected with locked fences or other secure enclosures to <br />prevent public contact with these facilities for as long as they are needed. <br />1. All development projects on lands adjacent to Lot 14 shall conduct a gas <br />survey to determine if significant gas migration from the landfill is <br />affecting the development site. The results of the survey shall be used to <br />determine if standard construction of structures is appropriate or if <br />non-standard foundation/building ventilation systems should be required. <br />m . Evacuation plans shall be prepared for the elementary school and possible <br />bed-and-breakfast inns and other commercial uses located within the Del <br />Valle Dam Flood Inundation Area for the unlikely event of a failure to the <br />Del Valle Dam. <br />n. Minimum six-foot high fencing shall be installed along the steep banks of <br />the Arroyo del Valle and all mining pits within the Plan Area to reduce <br />the potential for recreational use of these areas . Signs shall be posted <br />cautioning of steep, unstable slopes, and potential drowning hazards. In <br />addition, the stability of slopes along the Arroyo shall be evaluated and <br />modified, if necessary, to be made stable under short-and long-term <br />conditions. <br />Energy-Efficient Construction <br />a. Energy-efficient heating and cooling systems and energy-efficient lighting <br />shall be required in all residential, commercial, and school construction. <br />b. Only United States Environmental Protection Agency-approved fireplaces <br />and wood-burning stoves shall be permitted in residential units. <br />56