2018.10.29 SEAF, Subdivision Plat, Stormwater ReportRalph G. Mastromonaco, PE PC Consulting Engineers
Michael Izzo, October 29, 2018
Building Inspector
Village of Rye Brook
938 King Street,
Rye Brook, NY 10573 Via Email
Re: 259 North Ridge Street
North Ridge Street Development
Rye Brook, NY
Dear Michael,
Anthony Zaino, Assistant Commissioner of the Westchester County Planning Department, in an
email dated October 23, 2018 that stated you need additional materials from our office.
As requested in that email, enclosed please find the following additional materials in digital format:
1. Short Environmental Assessment Form for North Ridge Street Development dated April 11,
2018,
2. North Ridge Street Development Stormwater Report dated April 12, 2018,
3. Preliminary Subdivision Plat dated April 10, 2018,
4. 259 North Ridge Street Tree Inventory and Planting Plan dated April 8, 2018 by Anthony
Zaino, LA.
Comment: Cover letter stating this application is a continuation of the original submittal and is a
revised plan in response to Village Planning Board and public comments, and this
application is to request the rezoning of lot #1 to FAH.
Response: The above materials #1-4, are in addition to other materials already submitted
and is a continuation of the original application which has been revised in
response to the Village Planning Board and public comments. The applicant is
requesting a rezoning of Lot #1 to Fair and Affordable Housing (FAH).
Because of the comments of the Village Planning Board and the public, the
scope of the application is significantly reduced. The project originally
proposed eight (8) units of affordable housing which is now reduced to four (4)
units in two (2) two-family houses. This reduction in scope greatly reduces
traffic from the original development.
Comment: Revise EAF to reflect new plan
Response: The Short Environmental Assessment Form, included herein, for North Ridge
Street Development dated April 11, 2018 reflects the current proposal.
Ralph G. Mastromonaco, PE PC Consulting Engineers
2 North Ridge Street Development
Comment: Electronic version of the preliminary plat
Response: The Preliminary Subdivision Plat dated April 10, 2018 is provided herewith.
Comment: Stormwater calculations
Response: The North Ridge Street Development Stormwater Report dated April 12, 2018
provided herewith and contains all calculations. In addition, the plans show
the appropriate storm water computations.
Comment: Revised traffic analysis, or letter stating the revised plan will have a lower impact on
traffic.
Response: The reduction in the scope reduces traffic from the original proposal. The
Traffic Assessment dated May 4, 2016 was based upon eight (8) units of
affordable housing. The current proposal is four (4) units of affordable
housing basically halving predicted traffic to 3 and 4 trips in the AM and PM
peak hour. (See Attached Worksheet)
Comment: Analysis of school aged children
Response: With the smaller scope of the project, there will be less school aged children
than the original proposal. Using the same multipliers used by the consultants
in earlier reports, we estimate 2 school aged children would be generated from
the 4 affordable housing units and 1 students from the existing single family
home, and 1 student from the new single family home, for a total of 4 students.
Comment: Tree inventory and Landscape plan (attached)
Response: The tree inventory and Planting Plan dated April 8, 2018 are attached herein,
identified as item #4 in the list of materials in this submission.
This submission is in addition to earlier materials submitted to the Village and is a continuation of
the original application which has been revised in response to the Village Planning Board and public
comments.
Please call if you have questions or require additional information.
Sincerely,
Ralph G. Mastromonaco, PE
RGM/mte
Cc: Lou Larizza w/o enclosure
Anthony Zaino w/o enclosure
Michael Nowak
Chris Bradbury
Ralph G. Mastromonaco, PE PC Consulting Engineers
3 North Ridge Street Development
Attachment: North Ridge Street Development: Traffic Generation Worksheets
Short Environmental Assessment Form
Instructions for Completing
Part 1 - Project Information. The applicant or project sponsor is responsible for the completion of Part 1. Responses
become part of the application for approval or funding, are subject to public review, and may be subject to further verification.
Complete Part 1 based on information currently available. If additional research or investigation would be needed to fully
respond to any item, please answer as thoroughly as possible based on current information.
Complete all items in Part 1. You may also provide any additional information which you believe will be needed by or useful
to the lead agency; attach additional pages as necessary to supplement any item.
Part 1 - Project and Sponsor Information
Name of Action or Project:
Project Location (describe, and attach a location map):
Brief Description of Proposed Action:
Name of Applicant or Sponsor: Telephone:
E-Mail:
Address:
City/PO: State: Zip Code:
1. Does the proposed action only involve the legislative adoption of a plan, local law, ordinance,
administrative rule, or regulation?
If Yes, attach a narrative description of the intent of the proposed action and the environmental resources that
may be affected in the municipality and proceed to Part 2. If no, continue to question 2.
NO YES
2. Does the proposed action require a permit, approval or funding from any other governmental Agency?
If Yes, list agency(s) name and permit or approval:
NO YES
3.a. Total acreage of the site of the proposed action? ___________ acres
b. Total acreage to be physically disturbed? ___________ acres
c. Total acreage (project site and any contiguous properties) owned
or controlled by the applicant or project sponsor? ___________acres
4. Check all land uses that occur on, adjoining and near the proposed action.
Urban Rural (non-agriculture) Industrial Commercial Residential (suburban)
Forest Agriculture Aquatic Other (specify): _________________________
Parkland
Page 2 of
5. Is the proposed action,
a. A permitted use under the zoning regulations?
b. Consistent with the adopted comprehensive plan?
NO YES N/A
6. Is the proposed action consistent with the predominant character of the existing built or natural
landscape?
NO YES
7. Is the site of the proposed action located in, or does it adjoin, a state listed Critical Environmental Area?
If Yes, identify: __________________________________________________________________________
_______________________________________________________________________________________
NO YES
8. a. Will the proposed action result in a substantial increase in traffic above present levels?
b. Are public transportation service(s) available at or near the site of the proposed action?
c. Are any pedestrian accommodations or bicycle routes available on or near site of the proposed action?
NO YES
9. Does the proposed action meet or exceed the state energy code requirements?
If the proposed action will exceed requirements, describe design features and technologies:
_______________________________________________________________________________________
_______________________________________________________________________________________
NO YES
10. Will the proposed action connect to an existing public/private water supply?
If No, describe method for providing potable water: ______________________________________
_______________________________________________________________________________________
NO YES
11. Will the proposed action connect to existing wastewater utilities?
If No, describe method for providing wastewater treatment: ________________________________
_______________________________________________________________________________________
NO YES
12. a. Does the site contain a structure that is listed on either the State or National Register of Historic
Places?
b. Is the proposed action located in an archeological sensitive area?
NO YES
13. a. Does any portion of the site of the proposed action, or lands adjoining the proposed action, contain
wetlands or other waterbodies regulated by a federal, state or local agency?
b. Would the proposed action physically alter, or encroach into, any existing wetland or waterbody?
If Yes, identify the wetland or waterbody and extent of alterations in square feet or acres: _______________
_______________________________________________________________________________________
_______________________________________________________________________________________
NO YES
14. Identify the typical habitat types that occur on, or are likely to be found on the project site. Check all that apply:
Shoreline Forest Agricultural/grasslands Early mid-successional
Wetland Urban Suburban
15. Does the site of the proposed action contain any species of animal, or associated habitats, listed
by the State or Federal government as threatened or endangered?
NO YES
16. Is the project site located in the 100 year flood plain?NO YES
17. Will the proposed action create storm water discharge, either from point or non-point sources?
If Yes,
a. Will storm water discharges flow to adjacent properties? NO YES
b. Will storm water discharges be directed to established conveyance systems (runoff and storm drains)?
If Yes, briefly describe: NO YES
_______________________________________________________________________________________
_______________________________________________________________________________________
NO YES
18. Does the proposed action include construction or other activities that result in the impoundment of
water or other liquids (e.g. retention pond, waste lagoon, dam)?
If Yes, explain purpose and size: ____________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
NO YES
19. Has the site of the proposed action or an adjoining property been the location of an active or closed
solid waste management facility?
If Yes, describe: _________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
NO YES
20. Has the site of the proposed action or an adjoining property been the subject of remediation (ongoing or
completed) for hazardous waste?
If Yes, describe: __________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
NO YES
I AFFIRM THAT THE INFORMATION PROVIDED ABOVE IS TRUE AND ACCURATE TO THE BEST OF MY
KNOWLEDGE
Applicant/sponsor name: ___________________________________________ Date: ___________________________
Signature: _______________________________________________________
PRINT FORM
RALPH G. MASTROMONACO, P.E., P.C.RALPH G. MASTROMONACO, P.E., P.C.RALPH G. MASTROMONACO, P.E., P.C.RALPH G. MASTROMONACO, P.E., P.C. Civil Civil Civil Civil / Site / Site / Site / Site / Environmental / Environmental / Environmental / Environmental
Consulting Engineers www.rgmpepc.com
13 Dove Court, Croton-on-Hudson, New York 10520
Tel: (914) 271-4762 Fax: (914) 271-2820
PROJECT: NORTH RIDGE STREET DEVELOPMENT
Subdivision and Site Plan for Affordable Housing
SCOPE: STORMWATER REPORT
DATE: April 12, 2018
INTRODUCTION:
The 3.96 acre site is proposed for development of one new single family home and 4 affordable
townhomes and a single family home. As the total disturbance is under 1 acre the project does
not require NYS DEC post-construction stormwater treatment, however, treatment by infiltration
is proved to enhance environmental conditions in the area.
Figure: Site Location and Zoning
2 North Ridge Street Stormwater Report RGM PE PC
METHODOLOGY:
The Rye Brook Stormwater rules call for the capture of the 25 year storm over the impervious
areas. To effectuate that requirement we modeled the approximately 11,648 square feet of
impervious area (CN=100) as tributary to the infiltration basin which also provides stormwater
detention.
For the new Single Family Home we modeled approximately 5050 square feet of impervious
area and captured the 25 year storm.
In each case the storage system captured the 25 year storm runoff such that there was
no overflow. The printout of the computer model is attached.
Figure: Aerial Photograph Showing Property Boundaries
3 North Ridge Street Stormwater Report RGM PE PC
Figure: Site Plan – Townhouse Units
Note: Infiltration Basin is designed in accordance with Rye Brook Stormwater Code (25 year
storm) and the 24 hour duration storm.
Table: Summary of Stormwater Infiltration System
Stormwater
System
Inflow
(cfs)
Outflow
(cfs)
Exfiltrated
(cubic feet)
Required
(cubic feet)
Townhouses (4) 1.64 0 6229 6213
Single Family (1) 0.63 0 2700 2693
4 North Ridge Street Stormwater Report RGM PE PC
Figure: Single Family Lot Showing Drywells
Note: Drywells are proposed based on a typical residential building. Final building permit plans may
dictate minor changes to this stormwater system.
5 North Ridge Street Stormwater Report RGM PE PC
Table: Rainfall Values; 24 Hour – 25 year Storm Used
MAINTENANCE:
All stormwater systems shall be inspected annually. In the event that silt buildup of more than 1
foot is noted in any system, the system shall be cleaned and returned to original design
conditions.
NOTES:
This project is below the threshold where it would require post-construction treatment as
required by the Village of Rye Brook, the NYS DEC and the NYS General Permit for
Stormwater. However, we have included post construction treatment to fully mitigate any
environmental impacts. Infiltration rates were taken in the field and lower values in this report
as a conservative approach.
Since the project is less than 1 acre a NYSDEC Notice of Intent is not required.
CONCLUSION:
The hydrologic details of the proposed storm water system are indicated in the enclosed
Hydrocad printout. Further detail is shown on the Site Plans for the project. The proposed
infiltration treatment system and the proposed storm detention system will mitigate the impacts
of the development as to quality and quantity of storm water.
Submitted by:
Ralph G. Mastromonaco, PE
NORTH RIDGE STREET DEVELOPMENT
RYE BROOK, NEW YORK
HYDROLOGIC MODEL