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TABLE 21 ANTICIPATED CONSTRUCTABILITY OF ALTERNATIVES CORRAL HOLLOW SANITARY LANDFILL ENGINEERING FEASIBILITY STUDY Alternative Description Score Remarks Construction of landfill final cover systems is common practice,and there are numerous,highly-qualified contractors who can perform this work. Due to somewhat restricted access and small working area,staging the No.1 Final Cover Extension 7 construction work may be difficult. A high-pressure gas line crosses the work zone,and may require specialized equipment to avoid damage to the pipeline. Ultimately,this would be a very small construction project that should present few difficulties to a reputable contractor. Construction of additional landfill gas extraction wells and lateral pipelines is common practice on landfills that should pose few problems to a reputable contractor. Care must be exercised to maintain the Enhanced Landfill Gas integrity of the geosynthetic final cover system for wells installed N°'2 Extraction 8 through the new cover system. The existing landfill gas extraction system and flare station are reported to have sufficient capacity to accept gas from the six new extraction wells that are proposed. Numerous sparging and vapor extraction wells are required to treat the plume. Wells will be spaced at 50-foot centers. Drilling and construction use standard methods. Blower and compressor equipment will need to be installed at the treatment site,and ancillary piping will be needed to No.3 IAS/VES 4 transmit extracted vapors to the perimeter landfill gas collection system. In addition,recognizing the need for operations and maintenance equipment to travel on the roadway and the potential for vandalism, IAS /VES wells will need to be installed in protective vaults that can be accessed to permit air-flow and vacuum adjustments. Wells MW-9A, MW-10A,and MW-11A would service as Intrinsic Remediation monitoring wells. Aside from installing bladder pumps in No.4 Intrinsic Remediation 10 each of these three wells,no construction is required. From a constructability standpoint,this is considered the simplest alternative. The conceptual groundwater extraction system is located along the point No.5 Groundwater Extraction of compliance,spanning the distance between wells MW-8 and SB-1. It with Air Stripping 6 is estimated that nine extraction wells would be required to achieve containment,but drilling and well construction are fairly routine. This alternative also requires installation of pumps,construction of control Groundwater Extraction boxes,wiring for a permanent power supply,construction of a liquid No.6 with GAC Treatment 5 storage tank,a conveyance pipeline to the conceptual treatment system, and an above ground conveyance pipeline to the stormwater retention basin. The system should also include safeguards against vandalism or incidental damage.