Division of Hazardous Waste Remediation Croton Point Landfill1 Site Number 360001 Westchester County, New York Record of Decision March 1993 Funded Under Title 3 of the 1986 Environmental Q~alityBond Act New York State Department of Environmental Condewation . MARIO M. CUOMO, Governor THOMAS C. JORLING. ~ornrnissioner, RECORD 01 DECISION CROTON POI= SANITARY LWDFILG WESTCEESTER COmOrm, NEW YORK ID…

hnd appropriate requirements that will not be met. This remedy ukilizes permanent solutions and alternative treatment or resource recpvery technologies, to the maximum extent practicable. However, beFaUSe treatment of the principal threats of the site was not found to be practicable, this remedy does not satisfy the preference for treatment as a pribcipal element. Because this remedy will not allo…

base upon which to develop a final investigative program for the CPSL. One of the later reports concerning the site impacts, prepared for the USEPA in 1986, was utilized by the NYSDEC to classify the landfill as a cjass 2 inactive hazardous waste site under New York State law. A list 0% the previous investigations and study efforts is included in Exhibit A of this Record of Decision (ROD). The Cou…

fill. Although water quality standards are being exceed d in the immediate vicinity of the waste mass, it is believed that once t e site is isolated to stop the periodic leachate releases and upgradient cpean waters are routed around the landfill that the water quality will again be within standards. I Groundwater (GW) quality was evaluated through two rounds taken from +.\a 22 individual wells in…

The wetlands vegetative work was designed to duplicat previous transects established by Buckley, et al. in the early 1970 s. Aerial infraThe results red spectrometry was used as an additional assessment tool showed that although the marsh has transitioned from catta 1 dominated to phragmites dominated, that the biomass has recovered from revious recorded lows and that this increased biomass is con…

developed in accordance with the New York State Environmental Co+servation Law (ECL) and 6 NYCRR Part 375, NYS Inactive Hazardous Waste Sit Remedial Program. The ROD is consistent with the Comprehensive Environme tal Response, Compensation, and Liability Act of 1980 (CERCLA), 42 U C Section 9601, et., seq., as amended by the Superfund Amendments and Reau horization Act Of 1986 (SARA). The criteria…

the remedial alternative selected. This air from the site on a regular basis. This program will be evaluated periodically to ensure it remains and applicable based on the site data. This review will occur at of every five years for a minimum period of thirty years. Institutional controls in the form of deed restrictions on the use bf groundwater beneath the site and limitations on land uses are in…

in time that is earlier (by several years) then that which is predicted to be achie ed with a cap alone. Using chromium as an example, this alternative wou d reduce loading t o the surrounding areas from an estimated level of 13.7 po nds per year (at a point in time one year after capping is complete and with ut any pumping) to less than 2.4 pounds per year with pumping. Capping alon would achieve…

disposal 04 the sediments is from $2,650,000 (15,000 cubic yards) to $4,435,000 (45,000 cbbic yards). If these materials are disposed of offsite the coets will increase to an estimated total of between $4,150,000 (15,000 yde) and $8,935,000 (45,000 yds). Implementation of this alternative worlld result in a significant short term disturbance of this sensitive habitat. Time to 1mplement:b months Di…

or 2B and also has the greatest potential for ehort-term exposures due to dust and volitilization of organics during excalration of the waste. Alternative 1 is the easiest to implement and the lowest in cost since no action would be taken. Alternative 2 is the easiest "action alternative" to implement and least cost followed by Alternatives 2B and 3 regpectively. 2. C m t o n Narsh Eastern chainel…

expanded as needed throughout the project, and used to distribute information and meeting announcements. Comments received regarding the Proposed Remedial fiction Plan [PRAP) have been addressed and are documented in the Responsiveness Summary (Exhibit D). I VIII. SELECTED REMEDY The selected remedy consists of Source Alternative 2 and Marsh Alternative 48 which would incorporate the final design …

any signidicant leakage through the cap, will be noticed right away and could be qqickly remedied to maintain the cap's integrity. Deed restrictions will ensure that this future use will not result in unacceptable exposure to contaminants. Because this remedy will not allow for unlimited use and unrestricted exposure to wastes, within five years after completion of remedial action, a five year rev…

- LOCATION-SPECIFIC SCGs 6 NYCRR Parte 662-665: Freshwater Wetlands Regulations National Historic Preservation Act (16 USC 470-470 et seq.) EXHIBIT A: ADMINISTRATIVE RECORD CROTON POINT SANITARY LANDFILL WESTWESTER COUNTY, N.Y. ID NUMEER 360001 I "Final Feasibility Study Report for: Croton Point Sanitary L ndfill," prepared for Westchester County by Velzy-Weston, Inc.; June 1 6 2 confirmed to Sept…

a final judgeme& United States v. Edwin H. Michaelian which requires car actions to be taken at the landfill site. Annual report submitted to the USDOJ by the County. in Geraghty & Miller. Inc completes a Phase I1 study of thd hydrology of the Croton Point Landfill area for the County. Geraghty & Miller, Inc produce a summary report of exis ing information concerning the groundwater conditions and…

Constnuction Company for construction of the leachate transfer system which is completed and operational by 4/92. This system begins to dewater the leachate mounds in the 2 lined cells and assists in .the management of leachates from the original cell. The County holds a public hearing in the Village on their Draft Environmental Impacts Statement:Proposed Dredging for Materials Delivery:CPSLm. Due…

STANDARDS: Groundwater-X Drinking Water- Sediment-X Surface Water-X Air- LEGAL ACTION: TYPE..: Consent Order-DEE State- X STATUS : Negotiation in Progress- - FederalOrder Signed- X REMEDIAL ACTION: Proposed- Under design-X In Progress- Cwupleted- NATLTRE OF ACTION: Engineered capping systems, leachate coll+ction GEOTECHNICAL IINFOFNATION: SOIL TYPE: Sand, peat, silt. and clay GROUNDWATER DEPTH: Un…

an additional extension was not granted, however, comments received shortly after the January 15th deadline were considered. Issue 2: Under the contractor's proposed material ttansport method, a private road running through the Half Moon Bay development would be used. There was $n objection to the capping contractor's use of that private road by an alleged owner of a portion of that road. ReSDOnse…

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…

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 prepa…

volume of water percolating the landfill producing leachate. Operating a leachate collection system early as we are currently doing is the most effective means of curtailing contaminant rich leachate loading to the environment. The pumping system proposed would only be operational after the cap is in place and would function as an expensive redundant leachate collection system. The reason these tw…

will continue to migrate into the river subsurface approximately 99.9% of the rain and snow melt water will be eliminated from leachate generation by the cap. The landfill leaahate mound (water level within the waste) will be starved of water and will begin to fall as leachate continues to be removed via the collection system. The substrate is not an adequate liner to enhance with a slurry wall an…

Stormwater discharge testing will be set by the DEC under the County's general stormwater discharge permit. Marsh sediments will be tested for arsenic, cadmium, copper, lead, mercury, and silver at a minimum. Leachate will be tested monthly for the first several years for biological oxygen demand (BOD), total suspended solids, total organics, and various metals including antimony, cadmium, chromiu…

shallow root systems that will not impact the liners. Resoonse: Both white clover and weeping lovegrass have already been included in the final cover planting specifications. The second recommendation is excellent and is being carefully reviewed by DECts biologists and engineers with the goal of providing suitable habitat for breeding, migratory, and wintering species of birds and other wildlife w…