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4.2.1 I mpiementabi l ity <br /> Several criteria are typically considered when evaluating the implementability of <br /> alternatives.These include the practical limitations of the alternative, such as <br /> e Degree of difficulty associated with construction <br /> e Expected operational reliability <br /> e Need to obtain approval or operational permits from other regulatory agencies <br /> e Availability of equipment or specialists required to implement the remedial action <br /> e Capacity and location of treatment,storage, or disposal services required <br /> The no-action alternative is considered to have a high degree of implementability with respect <br /> to the previously listed criteria. However, it is unlikely that the RWQCB would allow the"no <br /> action" alternative even though the nature and extent of the contaminants are limited to one <br /> monitoring well and relatively low concentrations of VOCs. <br /> The source control alternative is also considered highly implementable. The landfill intends <br /> to construct a final cover as a part of closure operations. A properly installed final cover <br /> typically has a high degree of operational reliability. No additional approvals or permits <br /> should be required aside from the agency approvals already necessary to implement the <br /> final cover (approval of the Corral Hollow Sanitary Landfill Final Closure Plan (County, <br /> February 1995). <br /> Both groundwater extraction and treatment systems, and physical barriers are considered <br /> to have a medium degree of implementability. A groundwater extraction and treatment <br /> system would require a significant number of wells to be installed while a physical barrier <br /> system would present an extremely high degrees of construction difficulty. The expected <br /> operational reliability of these alternatives is also relatively similar, since if properly <br /> designed, each is capable of attaining long-term effectiveness. Construction and <br /> installation of either technology will require approvals from RWQCB. Both groundwater <br /> extraction and treatment systems and physical containment barriers, require some form of <br /> specialized equipment and operators to implement (drill rigs, cranes, deep excavators, <br /> etc.). However, specialized equipment and operators are typically available without <br /> significant difficulty. <br /> 4.2.2 Effectiveness <br /> The effectiveness of alternatives is based on whether they are suitable for remediating the <br /> site. Issues that are considered under this category include: <br /> SACNN�PJGM3M390031.9BG-94�sdg:1 Rev.0,4/20/95 <br /> 0939-003.19 4.-5 <br />