for wildlife? What activities will beallowed in thecapped area once it is turned over to the County Parks Department as a passive use park? ReSDOnSe: There is no plan to close the park due to cap construction activities. However, several restrictions within the Croton Point peninsula will restrict some park activities such as vehicle access to all areas. The site Health and Safety Plan (HASP) will also contain contingencies to close the park if necessary based on ambient air monitoring. This situation is not expected but is included in the HASP as a precautionary measure. The construction project includes the rebuilding and restoration of the entire park road. The contractor will also be required throughout the construction to maintain the road in passable condition. After construction, the landfill will be seeded and landscaped. Vegetative plantings in specific areas of the landfill cover will be chosen to provide habitats . conducive to various forms of wildlife while not compromising the cap's integrity with deep root systems. Outside the capped area (staging or other areas disturbed by construction), the contractor is required to bring those areas back to the original condition or better. Photographs will be taken prior to the start of construction to document the original conditions. The Departments of Environmental Conservation and Health will require the County to place permanent deed restrictions on the capped area. While the details of these restrictions have not been finalized, in general they would restrict any intrusive (excavation) activities and prevent any use of groundwater at the site. Issue 6: - . Will the methane gas being collected under this remedy be used to generate electricity? Will there be any incomplete combustion of the volatile organics? ReS~onSe: The Record of Decision (ROD) requires the installation of an active landfill gas (methane being one component) collection system with a gas flare to destroy the volatile organic components of the gas. An active gas collection system and flare exceeds the current regulatory requirements of passively venting landfill gases to the atmosphere. It also allows the flexibility to easily convert the flare system to an energy recovery facility which also would combust the gas. Although this ROD does not require energy recovery from the gas, the County is presently evaluating whether it is cost-effective to convert the flare system to one that recovers energy. The results from the flare stack emissions testing (required under DEC1s air permit program) demonstrate that the flare is able to destroy in excess of 99.9 percent of the volatile organics which exceeds the control requirements of the air permit for this flare. Issue 7 : . There are concerns about the handling of the leachate generated by the Croton Point Landfill. Will the "toxics**be treated by the Ossining Sewage Treatment Plant (STP) or simply passed through the plant and discharged to the Hudson River untreated? If the **toxics** end up in the STP sludge what is their fate in the incinerator where the sludge is burned? Won't the toxic material just enter the air or water at some other discharge point? Will the leachate composition change in the future and how will that be addressed by this remedy? Resuonse: The STPfs pretreatment limits determine whether or not the leachate must be treated prior to discharge of the ' leachate to the sewer system. Those pretreatment limits are set by the STP operator in order for the STP to meet the discharge limits set by DEC. In essence, the DEC regulates what comes out of the STP discharge pipe while the STP regulates what can enter their system. Prior to sending the leachate to the Ossining STP, the County's engineering consultant evaluated this STP's ability to properly handle and treat the leachate contaminants and the ultimate fate of those contaminants (refer to the report, "Croton Point Sanitary Landfill Leachate Collection System Performance and Operational Proceduresu prepared by Savin Engineers, P.C.). The evaluation showed that all parameters of the leachate comply with the Westchester County Environmental Facilities Act and pretreatment requirements. he evaluation of leachate impacts on the STP demonstrated that none of the current State Pollution Discharge Elimination System (SPDES) Permit Action Levels would be exceeded. With the addition of the leachate to the waste stream entering the SPT, none of the projected STP effluent (discharge) concentrations would exceed the Permit Action Level. For the metals of concern, the projected plant effluent/SPDES Permit Action Level in pounds per day are as follows: copper (1.48/8.4) nickel (1.4713.9) zinc (4.115.3). Subsequent to this engineering evaluation the Westchester County Department of Public works prepared a report titled, 'Effect of Croton Point Leachate on the Ossining WWTP." Table 2 of this report provides the following actual discharge rates in pounds per day: copper 1.47, nickel <1.83, and zinc <1.83. The contribution of these metals from the leachate