ENB Region 3 Completed Applications 03/22/2006

The applicant proposes to place fill to construct low (less than 6 feet highh) berms within the 100-foot adjacent area  of Freshwater Wetlands DP-22 and PL-15 in order to make various improvements to approximately 21.5 acres in order to enhance agricultural acticities and waterfowl habitat. The location of this 513-acre working farm is on the west side of Route 22 just north of the Dutchess-Putnam county line.

       The Village of Wappingers Falls has applied for a Water Supply permit (WSA# 10,870) to augment its existing water supply wells by taking a supply of water from a new well (a.k.a., Well #7), located at their Wappingers Lake Wellfield.   Well #7, together with the Village’s previously approved Well #3, would be pumped at a combined rate of 500 gallons per minute.  Well #7 is 99-feet deep and is encased in steel down the first 87 feet to prevent the infiltration of surface waters.  The last 12 feet are screened to allow pumping from the aquifer only.   

        Well #7 and the Wappingers Lake Wellfield are located between West Main Street and Wappingers Lake in the Village of Wappingers Falls, Town of Wappinger, Dutchess County.

The Department has initiated a modification of the State Pollutant Discharge Elimination System (SPDES) permit for the Town of Yorktown Yorktown Heights wastewater treatment plant (WWTP.)  This permit has been modified in accordance with 6 NYCRR Part 750-1.18, New York State's  Environmental Benefit Permit Strategy (EBPS).  There will be no increase in permitted flow at this facility as a result of this proposed permit modification. The following changes to the SPDES permit have been proposed:  

LIMITS AND ACTION LEVELS

The draft permit has both interim and final limits. Changes were made to the following limits, which apply to both the interim and final periods:

-Nickel - The limit decreased from 1.4 to 1.0 lbs/day, to reflect the newly calculated water quality based effluent limit (WQBEL).

-Copper - A newly calculated WQBEL of 0.25 lbs/day replaces the modified effluent limit of 0.45 lbs/d in the current permit.

-Lead - The newly calculated WQBEL is 0.21 lbs/day. The modified limit of 0.15 lbs/day in the current permit was modified to an Action Level of 0.10 lbs/day.

-Zinc -   A newly calculated WQBEL of 2.3  lbs/day replaces the modified effluent limit of 1.19 lbs/day in the current permit.

-Influent pH and Settleable Solids - monitoring is no longer required.

-Total Residual Chlorine - an interim daily maximum limit of 2.0 mg/l was added. The final limit is 0.1 mg/l.

Interim Limits - The interim limits remain the same except for the changes noted above and are in effect from the date of permit modification until 6 months after completion of construction of the plant upgrade. Six months after completion of construction are provided to allow biota to become established and for operators to develop routine operations.

Final limits and action levels - Modifications to the final limits and conditions include:

-The final limits take effect 6 months after completion of construction of the plant upgrade.

-Mass limits for CBOD and TSS were rounded in accordance with the Discharge Monitoring Report (DMR) Manual.

-A seven (7) day CBOD limit of 15 mg/l and 190 lbs/day was added to the permit.

-Temperature - An action level of 70 degrees F was added to the permit.

-Action levels for chronic toxicity, as toxicity units, are included in the permit as part of a whole effluent toxicity (WET) testing requirement.

-A water quality based effluent limit of 0.1 mg/l for total residual chlorine is included.

-Limits for pathogen reduction are included in the permit.

-The permittee is required to submit a final process flow diagram by October 2007.

-The permittee is required to develop and submit a stormwater pollution prevention plan for the facility.

A compliance schedule is included in the draft permit that requires the permittee to separate stormwater from leachate at the Town’s landfill so that only leachate will be discharged to the WWTP. Another compliance schedule requires development of a continuous sewer system assessment, flow monitoring, correction, and maintenance plan.

A draft permit is available for inspection and comment at the regional office.