HomeMy WebLinkAbout17-04P Toll Land XVIII Graham Rd IWA SHIPMAN &
GOODWI N LLP®
COUNSELORS AT LAW
Joseph P.Williams RECEIVED
Phone: (860)251-5127 FEB 0 8 2017
Fax: (860)251-5318
jilliams@goodwin.com South Windsor
INLAND WETLANDS AGENCY
CONSERVATION COMMISSION
February 8, 2017
VIA HAND DELIVERY
Ms. Elizabeth Warren, Chair
Inland Wetlands Agency/Conservation Commission
Town of South Windsor
1540 Sullivan Avenue
South Windsor, CT 06074
Re: Application by Toll Land XVIII Limited Partnership for conservation plan
approval and for a permit to conduct regulated activities associated with a
proposed Open Space Subdivision on real property known as R022 and R024
Graham Road and stormwater discharge at L024 Graham Road, South
Windsor, Connecticut
Dear Ms. Warren:
On behalf of our client, Toll Land XVIII Limited Partnership ("Toll"), an affiliate
of Toll Brothers, Inc., I have enclosed an application for conservation plan approval and for
a permit to conduct regulated activities on real property known as R022 and R024 Graham
Road in South Windsor ("subject properties") and on L024 Graham Road. Toll is seeking
to build a forty-five (45) lot Open Space Subdivision for single-family housing on the
subject properties and to discharge stormwater at L024 Graham Road.
The parcel located at R022 Graham Road is owned by The St. Margaret Mary
Roman Catholic Church Corporation of South Windsor, Connecticut, and the parcel located
at R024 Graham Road is owned by Catholic Cemeteries Association of the Archdiocese of
Hartford. Toll is under contract to purchase both properties. The R022 parcel abuts the
R024 parcel immediately to the south; both are located east of Graham Road, west of
Nevers Road and south of Joseph Lane. R022 Graham Road is vacant land, the majority of
which is forested. The R024 parcel is currently being used as farm land, and we understand
that this has been the case for several decades.
ONE CONSTITUTION PLAZA HARTFORD,CONNECTICUT 06103-1919 860-251-5000 WWW.SHIPMANGOODWIN.COM
Ms. Elizabeth Warren, Chair
February 8, 2017
Page 2
In accordance with Section 8.1.Q of the South Windsor Inland Wetland/Watercourse
and Conservation Regulations, we are requesting your approval of the Conservation Plan
for the subdivision. All required components of a Conservation Plan are contained in the
site plans and engineering report prepared by Milone & MacBroom that we are submitting.
We believe that you and your staff will find that the plan complies with all applicable
regulations and sufficiently minimizes any potential impacts.
Note that the majority of the existing property has a poorly draining row crop cover,
which results in a high amount of stormwater runoff. It is anticipated that the conversion of
these areas to lawn and meadow may offset the runoff created by the new roads and homes.
In addition, collection and proper routing of stormwater, as discussed below, is expected to
improve the existing situation involving uncontrolled overland flow across Graham Road.
The proposed development will be designed in accordance with the town's drainage
standards to provide zero net increase in runoff for the post-development conditions as well
as to meet the Connecticut Department of Energy and Environmental Protection water
quality standards for runoff discharging from the site. These drainage standards will be met
through the design of a series of Best Management Practices including stormwater detention
basins with appropriate water quality measures and pretreatment systems. The proposed
drainage system will include a series of grassed swales and typical drain and pipe systems
that convey stormwater from the new subdivision lots and roadways to detention/water
quality basins. The detention basins are designed to have water quality volume at the bottom
of the basin that promotes infiltration of stormwater. This infiltration practice and the other
BMPs will treat the stormwater before it drains from the detention basins primarily into the
Town-owned drainage systems in both Nevers and Graham Roads.
There are no wetlands on the two parcels proposed for subdivision. Confirmation of
the lack of wetlands and a description of site soils is provided in the enclosed letter report
by John Ianni of Highland Soils, LLC.
You will note, however, that the parcel known as L024 Graham Road, which is
dedicated open space owned by the Town of South Windsor located on the west side of
Graham Road, is also part of this application. Our site plan proposes to discharge
stormwater from the western side of the new subdivision onto that parcel. We understand
that the Town will be a party to this application anticipating that based on the current
drainage patterns, internal road drainage will need to be discharged in that area. The Town
is therefore signing the application for the limited purpose of confirming its consent for Toll
to install a drainage structure on Town-owned property.
Ms. Elizabeth Warren, Chair
February 8, 2017
Page 3
There are wetlands on the Town's open space parcel at L024 Graham Road. Based
on discussions with Town staff, our team determined that the optimal location for the
drainage outfall would be at the bottom of the slope, within the upland review area to the
wetlands, so as to avoid erosion impacts. This work will require a minor, temporary
disturbance of about 1,800 square feet in the upland review area, which is why we are also
requesting a permit to conduct a regulated activity on the L024 parcel. The wetlands will
not be altered or adversely impacted due to this installation. Our engineers, working with
your staff, will ensure that the outfall will be designed and situated to avoid any long term
impacts from the stormwater discharge.
The portion of the property on which the regulated activity is proposed is not located
within five hundred (500) feet of the boundary of an adjoining municipality.
In addition to this letter, we are submitting to you, as required by your regulations:
fifteen (15) copies of the Inland Wetlands, Watercourses and Conservation Application,
owner authorization letters, Department of Energy and Environmental Protection Activity
Reporting form, and soil survey report; three (3) copies of the subdivision and site plans;
two (2) copies of the engineering report with drainage computations, list of abutting
property owners, and direct abutter notification letter with Certificate of Mailing; and a
check in the amount of$2,940.00 for the application fees.
We look forward to presenting this application to you at your earliest possible
meeting, and we thank you in advance for your consideration.
Very Truly Yours,
t ALA
Joseph P. Williams
Enclosures
cc: Mr. Ted Merchant
Daniel Kroeber, P.E.
5379411v2
RECEIVED
FEB 0 8 2017
TOWN OF SOUTH WINDSOR South Windsor
INLAND WETLANDS AGENCY
CONSERVATION COMMISSION
INLAND WETLANDS, WATERCOURSES AND CONSERVATION APPLICATION
Application# ,� Date Received Cq
INSTRUCTIONS
1. Fifteen applications (15) with map and plans (2 copies) shall be submitted together with the fee set forth
in the Inland Wetlands, Watercourses and Conservation Regulations, Town of South Windsor. (See
Regulations, Section VII—X)
2. The South Windsor Inland Wetlands, Watercourses and Conservation Regulations should be reviewed with
respect to the standards and criteria for application Evaluation. (See Regulations, Sections VII—X)
3. The applicant understands that this application is to be considered complete only when all information and
documents required by the Agency have been submitted. The applicant shall also complete the state filing
form.
A. Applicant's Name: Toll Land XVIII Limited Partnership and the Town of South Windsor
Address: c/o Toll Brothers, Inc., 42 Old Rid eg bury Road - 2"d Floor, Danbury, CT 06810
Phone: (home) (work) 203-616-4900 (fax)
B. Legal owner's name: See Exhibit A attached hereto.
Address:
Phone: (home) (work) (fax)
(List additional owners, addresses, and phone numbers on back of application)
C. If the applicant is not the owner of the subject property; a letter by the owner(s) authorizing the proposed
regulated activity set forth in the application must accompany this form and will be part of the application.
D. Project Name and Location The Estates at South Windsor; R022 and R024 Graham Road, South Windsor
1. Contact Person(if further information is needed)
Joseph P. Williams, Esq., Shipman& Goodwin LLP, One Constitution Plaza, Hartford, CT 06103-1919
(work) 860-251-5127 (fax) 860-251-5318
E. The geographical location of the property which is to be affected by the proposed regulated activities
including a description of the land in sufficient detail to allow identification of the property on the Inland
Wetland and Watercourse Map.
Assessor's map# 125 Parcel # 64 Zone RR&A-20
Assessor's map# 113 Parcel# 14 Zone A-20
Assessor's map# 125 Parcel# 99 Zone A-20
e
F. Names of all abutting property owners from records in Town Clerk's office. (use separate sheet if necessary)
See attached.
G. Have you notified all abutting property owners (from records in Town Clerk's office) by certified letter that
an application is pending before the Agency? Yes.
** (you are required to supply a copy of the letter with the list of the names of the abutters).**
H. Purpose and description of all proposed regulated activity(s) including amount of disturbance in square feet
and types of fill and the time element involved:
Project involves construction of a 45-lot subdivision along with the associated infrastructure including two new
town roads. There are no wetlands or watercourses and no regulated activities on the subject property. There is
a wetland corridor on the west side of Graham Road within the Town of South Windsor-owned openspace.
The new drainage system to be installed for the project will outlet stormwater toward this wetland system. The
drainage outfall will be located about 35 feet outside the actual wetland area, and 1,800 sf of the upland review
area will be temporarily impacted in this location during construction.
I. A class A-2 map of the property drawn to 1" =40', showing the area to be developed, extent of the wetlands
and watercourses affected, topography, existing and proposed activities and names and locations of adjacent
property owners must be submitted.
J. Amount of regulated area disturbance and types of fill (including wetlands and 80 foot Upland Review
Area). Temporary disturbance of 1,800 sf in URA for storm drainage installation, 0 cy of fill.
K. Acreage of wetlands and watercourses in regulated areas to be altered: 0
L. Acreage of wetlands and watercourses to be created: 0
M. Lineal feet of proposed stream alteration: 0
N. Total land area of project and percentage, which is wetlands: 0
O. Identify all other permits or approvals that have been issued, applied for, or required with respect to the
proposed activity set forth in this application. (These may include but not be limited to, local Planning &
Zoning, Zoning Board of Appeals, D.E.P., F.E.M.A., D.O.T., The Army Corps of Engineers, and any other
State, Local or Federal Permits.) Planning & Zoning=Open Space Subdivision(pending) and WPCA
P. The applicant (or designated representative) hereby attests that a sign will be posted at the following
location(s) _ Both sides of Graham Road,Nevers Road, Skyline Drive, and Norma Road
By Toll Brothers Name Jack Lannamann
on or before the following date February 17, 2017
8
e
Signature:
These signs must be displayed continuously for at least ten (10) days prior to scheduled meeting (see
Regulations, Section 7.3a)
The undersigned hereby applies for the regulated activities listed in paragraph I-1 above, for an Inland Wetlands,
Watercourses and Conservation permit for the property described herein and confirms that:
1. She/he is familiar with the currently effective Inland Wetlands, Watercourses and Conservation Regulations
of the Town of South Windsor.
2. She/he understands that at any time during the review period, the Agency may require the applicant to
provide more information about the wetlands and/or watercourses in question and/or any proposed activity.
3. All information submitted in the application for review shall be considered factual, or in the case of
anticipated activity, binding. A knowing failure of the applicant or any of her/his agents to provide correct
information, or performance exceeding the levels of activity anticipated, shall be sufficient grounds for
revocation of any permit under these regulations.
4. By making this application, the applicant gives permission to the Inland Wetlands, Watercourses and
Conservation Commission members and/or its representative to enter the portions of the premises which are
subject of the application for the purpose of inspection and investigation and otherwise evaluating the merits
of the application both before and after a final decision has been issued.
See owner authorization letters attached hereto.
Signature of Owner of Property
Date
Signature of Applicant B Jack Lannamann, Division President
Date 'L b 1-
9
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EXHIBIT A
Property Owners:
R022 Graham Road(Assessor's Map 113/Parcel 14) (GIS PIN# 3750R022)
Owner: The St. Margaret Mary Roman Catholic Church Corporation
of South Windsor, Connecticut
92 Hayes Road
South Windsor, CT 06074
Recorded at: Volume 128 and Page 304
R024 Graham Road (Assessor's Map 125/Parcel 64) (GIS PIN# 3750R024)
Owner: Catholic Cemeteries Association of the Archdiocese of Hartford
700 Middletown Avenue
North Haven, CT 06473
Recorded at: Volumel28 and page 307
L024 Graham Road (Assessor's Map 125/Parcel 99) (GIS PIN#37501,024)
Owner: Town of South Windsor 28
Vacant Land
L024 Graham Road
South Windsor, CT 06074
Recorded at: Volume 161 and Page 277
53345441
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Catholic Cemeteries Association
of the Archdiocese of Hartford j
700 Middletown Avenue
North Haven, CT 06473
'1
Februar
y , 2017
Ms. Michelle Lipe, Town Planner
Town of South Windsor
1540 Sullivan Avenue
South Windsor, CT 06074
Re: R024 Graham Road, South Windsor, Connecticut
Dear Ms. Lipe:
Catholic Cemeteries Association of the Archdiocese of Hartford is the owner of
real property located at R024 Graham Road, South Windsor, Connecticut (the
"Property"). Toll Land XVIH Limited Partnership and its affiliates ("Toll Brothers")
hold a contract to purchase the Property and are filing applications and requests for #
approvals with various boards, commissions and officials of the Town of South Windsor in
connection with the proposed development of the Property.
I hereby authorize Toll Brothers, its attorneys with Shipman & Goodwin LLP, and
its engineering and environmental professionals with Milone and MacBroom, Inc., to
pursue all necessary applications for approvals and permits required from the Town of
South Windsor regarding Toll's proposed single family residential development containing r
45 lots on the Property, and I fully join in and support these applications. In addition, I
I
hereby give permission to the South Windsor Inland Wetlands, Watercourses and j
Conservation Commission members and/or its representative, and the South Windsor #
Planning and Zoning Commission and/or its representative, to enter the portions of the
Property for the purpose of inspection and investigation and otherwise evaluate the merits
of the applications both before and after final decisions have been issued.
Very truly yours,
Catholic Cemeteries Association of the
Archdiocese of Harford
U P , I
By:
:
Duly authorized
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The St.Margaret Mary Roman Catholic Church
Corporation of South Windsor, Connecticut j
92 Hayes Road
South Windsor,CT 06074
February 6,2017
Ms.Michelle Lipe,Town Planner
Town of South Windsor
1540 Sullivan Avenue
South Windsor,CT 06074
Re: R022 Graham Road,South Windsor Connecticut
1
Dear Ms.Lipe:
The St. Margaret Mary Roman Catholic Church Corporation of South Windsor,
Connecticut is the owner of real property located at R022 Graham Road,South Windsor,
Connecticut(the"Property"). Toll Land XVIII Limited Partnership and its affiliates("Toll j
Brothers"}hold a contract to purchase the Property and are filing applications and requests
for approvals with various boards,commissions and officials of the Town of South Windsor i
in connection with the proposed development of the Property.
I hereby authorize Toll Brothers,its attorneys with Shipman&Goodwin LLP,and
its engineering and environmental professionals with Milone and MacBroom,Inc.,to pursue
0 necessary applications for approvals and permits required from the Town of South
Windsor regarding Toll's proposed single family residential development containing 45 lots
on the Property,and I fully join in and support these applications. In addition,I hereby give j
permission to the South Windsor Inland Wetlands,Watercourses and Conservation
Commission members and/or its representative,and the South Windsor Planning and Zoning
Commission and/or its representative,to enter the portions of the Property for the purpose of
inspection and investigation and otherwise evaluate the merits of the applications both
before and after final decisions have been issued. '
Very truly yours,
The St.Margaret Mary Roman Catholic Church
Corporation of South Windsor,Connecticut
By: � .r
Duly authorized
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Connecticut Department of
GIS CODE#:
ENERGY & For DEEP Use Only
ENVIRONMENTAL
PROTECTION
79 Elm Street • Hartford, CT 06106-5127 www.ct.gov/deep Affirmative Action/Equal Opportunity Employer
Statewide Inland Wetlands & Watercourses Activity Reporting Form
Please complete and mail this form in accordance with the instructions on pages 2 and 3 to:
DEEP Land& Water Resources Division, Inland Wetlands Management Program, 79 Elm Street, 3rd Floor, Hartford, CT 06106
Incomplete or incomprehensible forms will be mailed back to the municipal inland wetlands agency.
PART I: Must Be Completed By The Inland Wetlands Agency
1. DATE ACTION WAS TAKEN: year: Click Here for Year month: Click Here for Month
2. CHOOSE ACTION TAKEN(see instructions for codes): Click Hereto Choose a Code
3. WAS A PUBLIC HEARING HELD(check one)? yes ❑ no ❑
4. NAME OF AGENCY OFFICIAL VERIFYING AND COMPLETING THIS FORM:
(type name) (signature)
PART II: To Be Completed By The Inland Wetlands Agency Or The Applicant
5. TOWN IN WHICH THE ACTION IS OCCURRING (type name): South Windsor
does this project cross municipal boundaries(check one)? yes ❑ no N
if yes, list the other town(s) in which the action is occurring(type name(s)): ,
6. LOCATION (click on hyperlinks for information): USGS quad map name: Manchester or quad number: 38
subregional drainage basin number: 4004
7. NAME OF APPLICANT, VIOLATOR OR PETITIONER(type name): Toll Land XVIII Limited Partnership
8. NAME&ADDRESS/LOCATION OF PROJECT SITE(type information): R022, R024,and L024 Graham Road
briefly describe the action/project/activity(check and type information): temporary N permanent N description: Minor
disturbance in upland review area to install drainage outfall (temporary); 45 Lot residential subdivision
(permanent)
9. ACTIVITY PURPOSE CODE(see instructions for codes): B
10. ACTIVITY TYPECODE(S) (see instructions for codes): 1, 2, 95 10
11. WETLAND/WATERCOURSE AREA ALTERED(type acres or linear feet as indicated):
wetlands: 0 acres open water body: 0.00 acres stream: 0.00 linear feet
12. UPLAND AREA ALTERED(type acres as indicated): 0.04 acres.
13. AREA OF WETLANDS/WATERCOURSES RESTORED, ENHANCED OR CREATED(type acres as indicated): 0 acres
DATE RECEIVED: PART III: To Be Completed By The DEEP DATE RETURNED TO DEEP:
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Appl # 17-04P
00 1 inch - 200 feet The Estates at South Windsor MAPPING PROVIDED BY SBC UNDER CONTRACT.
° DATA MANAGED BY THE SOUTH WINDSOR
Subdivision ENGINEERING DEPARTMENT AND IT TECHNOLOGY
wG DEPARTMENT.
GENERAL NOTES
THE ESTATES AT SOUTH WINDSOR
n °Nmi u°evuort omv- � 4
Y �u m 4mr Maw o. GRAHAM ROAD AND NEVERS ROAD &
SOUTH WINDSOR, CONNECTICUT d
FEBRUARY 8,20I7
LOCATION MAP:
®u9 A PROJECT DATA
CONSTRUCTION SEQUENCE S0 Y5�'
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n onnA&vrr"m.=mmr m a r+xxm.m vsmrsre e m ru:.ua rm"o %.. ^� .DOSS(IN RR ZONE'; REO'D/PERMRIEU- PROVIDED
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EROSION CONTROL NOTES A-20 DIMENSIONAL CRITERIA REQ'D/PERMMED PROVIDED
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20%OF 12"RES(A-20)=2.53 ACRES
D M. TOTAL REQUIRED="`-ACRES
OPEN SPACE PROVIDED=20.14 ACRES
PROJECT SITE VICINITY MAP:
APPLICANT: LIST OF DRAWINGS
°•""-m TOLL LAND XVII LIMITED PARTNERSHIP NAME TITLE ITLESHEET
42 OLD RIDGEBURY ROAD KM KEYMAP
DANBURY,CT 06810
IN INDEX PLAN
OWNERS: EX SITE PLAN-EXISTING CONDITIONS
LA 14 SITE PLAN-LAYOUT&LANDSCAPING
CATHOLIC CEMETERIES ASSOCIATION GR 14, SITEPLAN-GRADING&UTILITIES
OF THE ARCHDIOCESE OF HARTFORD SE SITE PLAN-SEDIMENT&EROSION CONTROL PLAN
700 MIDDLETOWN AVENUE
NORTH HAVEN,CT 06473 PR Ib ROADWAY PLAN&PROFILE
PR5 OFFROAD SEWER PLAN&PROFILE
PREPARED BY: THE ST.MARGAREP MARY ROMAN SL SITEPLAN-SIGHTUNEPROFILES
CATHOLIC CHURCH CORPORATION OF SD1 SEDIMENT&EROSION CONTROLS DETAILS AND SPECIFICATIONS
RECENED ,, SOUTH WINDSOR,CONNECTICUT SO 241 SITE DETAILS
FF9082017 ��,MILONE 6&MACBROOW 92 SOHUTH WIND OR,CT 06074 5045 TOWN OF SOUTH WINDSOR STANDARD DETAILS
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Engineering Report —
The
Estates at South
1.0 PROJECT OVERVIEW
the_descriptions-and-computations included-within-this-Engineering Report and-Appendix are provided
in.support of the proposed site plan application for the Estates at South Windsor,an open space
subdivision consisting of 45 single-family residential lots to be located on two abutting parcels of land in
South Windsor,Connecticut. The subject parcels are located north of Saint Margaret Mary Church in
between Graham Road to the west and Nevers Road to the east. The overall property is±46.5 acres and
lies within Rural Residential(RR)and A-20 residential zo
nes. As part of this application,approximately
20.14 acres will be provided as open space.
The subdivision will gain access via two new public roads off Graham Road and Nevers Road. The newly
created Field Ridge Lane will extend easterly into the site from Graham Road for approximately 650 feet
leading to a new cul-de-sac. Longmeadow Drive will run westerly from Nevers Road and will extend
approximately 2,500 feet into the site until intersecting with Field Ridge Lane.
Domestic water service will be provided to the proposed homes by an extension of the existing water
main in Graham Road. Public sanitary to sewage will be provided
g p the new.subdivision by extensions of
the sewer mains on Graham Road and Nevers Road. All other utilities such as electric,telephone,cable,
and gas service will be provided through extension of existing services adjacent to the project site and
shall be located und
erground. More detailed design information regarding the proposed utilities can be
obtained from the site plans.
The stormwater management system for this site has been designed utilizingBest Management
f
Practices(BMPs)to provide water quality management while attenuating Bement
peak flow rates and runoff
volumes from the site. The design goal is to prevent increases in the predevelopment runoff rates and i
volumes to the nearby wetland areas,watercourses,drainages stems and nei h Y g boring properties. The
proposed system will use three on-site detention/water quality basins along with other stormwater
control measures before discharging stormwater runoff from the project site. For more detailed
information regarding stormwater quantity, refer to Sections 3.0 and 4.0 of this report. Refer to Section
i
5.0 for stormwater quality management provided in the proposed design. Design computations and I
other relevant information are provided in the Appendix of this report.
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2.0 EXISTING SITE CONDITIONS
-- - - - --T a ro ect semis oca ed east of Graham Road and west of Nevers Road in the north-central portion of
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the town of South Windsor. The site comprises of two distinguished parcels of land with total combined
land area of approximately 46.5 acres and bordered by residential homes to the west along Graham
Road, residential properties and open fields to the north, vacant wooded areas and a few homes to the
east along Nevers Road,and the Saint Margaret Mary Roman Catholic property to the south.
The northern and largest parcel is±38.2 acres and consists mostly of open field used for agriculture,an
unimproved dirt access road along the northern boundary,and wooded areas along its northern,
eastern,and southern perimeters. The largest parcel lies within two zones,approximately 33.8 acres in
the RR zone and±4.4 acres in the A-20 zone. The southern parcel has approximately
wooded land. An overhead utility corridor is located along it southern boundary. he entire parcel ismostly
located in an A-20 zone. There are no wetlands on the two parcels.
A well-defined ridge is centrally located on the site, which directs the stormwater runoff to the west
toward Graham Road and to the east toward Nevers Road. Runoff on the western portion drains as
overland flow to a roadside grassed swale adjacent to Graham Road. The swale also collects runoff from
eastern lane of Graham Road and then directs the flow to two town-owned storm drainage systems,
which convey runoff across Graham Road and discharge it to the west onto a town-owned property.
Stormwater runoff eventually drains to a wetland system and watercourse that flows westerly under an
existing 42-inch culvert south of Greenfields Drive and through Willow Brook Golf Course, ultimately
discharging to Podunk River.
Stormwater runoff that flows on the eastern portion of the site ultimately leaves the property in two
directions..-The northeast corner sheet flows off site onto the road gutter along the western lane of
Nevers Road,and runoff is eventually collected in a catch basin located approximately 450 feet to the
north of the site. Runoff is then discharged to a large wetland system located east of Nevers Road. The
remaining and vast majority of the runoff generated on the east side leaves the property through the
southern boundary and is eventually collected by the town-owned drainage systems in Nevers Road and
Hayes Road. A broad depression located in the southeast corner of the northern property holds some
runoff from the open fields before it is released to the south.
The entire site is located within the Podunk River watershed, which is part of the Connecticut Main Stem
Regional Basin and located within the Connecticut Major Basin. The watershed is identified as
Watershed 4004 on the Connecticut Department of Energy& Environmental Protection(CTDEEP)Atlas
of Public Water Supply Sources and Drainage Basins. According to the effective Federal Emergency
Management Agency(FEMA) Flood Insurance Rate Map(FIRM)for the area,there is no Special Flood
Hazard Area (SFHA) extending onto the property.
oi�'V MILONE&MACBROOM'
A Engineering Report — The Estates at South Windsor Page 3
3.0 STORMWATER MANAGEMENT DESIGN
The-proposedstormwater_man_agem_ent plan for this site has been developed utilizing Best Management
Practices(BMPs)to provide safe conveyance of stormwater runoff while providing no net increases in
peak runoff rates and volumes from the project site for the 2-year through the 100-year storm events.
A stormwater treatment train is proposed including grassed swales,catch basins with 2-foot-deep
sumps,sediment forebays,and retention volume within the proposed stormwater management basins.
Three proposed detention/water quality basins were designed to control stormwater runoff in order to
prevent increases in the predevelopment rates and volumes from the site.
An on-site soil testing program was performed to confirm the feasibility of using infiltration in the design
of the proposed stormwater basins. Tests consisted of several test pits and visual field identifications,
which were critical to determine the locations where the existing underlying soils would allow for some
infiltration. Permeability samples were taken from the test pits,and failing head permeability tests
were run on each sample. The soil testing results were consistent with the information obtained from
the U.S. Department of Agriculture—Natural Resources Conservation Service(USDA-NRCS)Soil Survey j
for Hartford County,which indicates the presence of well-drained Enfield soils. This series is 1
characterized by higher permeability at deeper soil substratum while permeability is moderate in the
surface layers. ,
i
Based on the testing results, proposed Detention Basin 200E(east side,south of Longmeadow Drive)
and Detention Basin 410(west side adjacent to Graham Road)were designed to infiltrate stormwater
runoff utilizing exfiltration rates obtained from the falling head permeability tests. Proposed Detention
Basin 200A(east side, north of Longmeadow Drive)was designed with a wet bottom and did not
account for any infiltration due to the presence of cobbles and breakable ledge in the area of the basin. !.
The exflitration rates used in the hydrologic computations were averaged out and reduced by 50%,thus
providing a safety factor of 2,which is recommended by the CTDEEP2004 Stormwater Quality Manual.
The test pit logs and the falling head permeability test results are included in the Appendix of this
report.
The computer program entitled Hydraflow Storm Sewers Extension forAutoMe Civil3Do 2016 by
Autodesk, Inc.,Version 10.5,was used for designing the proposed storm drainage collection system.
Storm drainage computations performed include pipe capacity calculations,hydraulic grade line,and
gutter flow calculations. The overall watershed was divided into subcatchments to determine the
drainage area and land coverage to each individual system inlet. These values were used to determine
the stormwater runoff rate to each inlet using the rational method. The rainfall intensities for the site
were obtained from the National Oceanic and Atmospheric Administration(NOAA)Atlas 14 Precipitation ,
Frequency Data Server(PFDS).
zi
The proposed storm drainage system was designed to provide adequate pipe capacity to convey the 10-
year storm event. In addition,the storm drainage design analysis includes a complete hydraulic grade
line computation,which ensures adequate capacity for the 10-year storm event. A gutter flow analysis $
was performed on the storm drainage systems as well to ensure appropriate spacing and inlet capacity
for the 10-year storm event. All storm drainage computations are included in the Appendix of this
report.
���MMONE&MACBROOM
ENGINEERING REPORT-THE ESTATES AT SOUTH WINDSOR FEBRUARY 2017
i
GRAHAM ROAD AND NEVERS ROAD-SOUTH WINDSOR,CONNECTICUT PAGE 4
The proposed stormwater management system balances the safe conveyance of stormwater runoff-with
the attenuation of peak flow rates and volumes while providing stormwater quality measures for the
project design. The design of the stormwater management system minimizes potential impacts to
--"exisTing ew t and areas,,watercourses,storm drainage systems,a developed areas downstream of the
site.
I'S MiLo E& A B o .
40 HYDROLOGIC ANALYSIS
A detailed hydrologic analysis has been conducted to analyze the predevelopment and
pbstdevelopment peak flow rates and rung volumes from the site "Eight analysis points consisting of -
10 subwatershed areas were chosen based on the fact that each area receives stormwater runoff from a
portion of the proposed project site,including the contributing off-site upstream areas. The existing
subwatersheds were used
to determine runoff for current site conditions. The existing watersheds were
then modified and subdivided further to reflect the proposed changes to the site and analyze the
hydrology under proposed conditions. The total combined watershed area delineated is approximately
123.6 acres under both existing and proposed conditions. A watershed map for both existing and
proposed conditions is included in the Appendix of this report. The following table provides a brief
description of the eight analysis points used in this hydrology study:
Analysis Description:
#- Point:
A Northeastern Property Boundary(subwatersheds numbered in the 10s)
B1 Southeastern Property Boundary(subwatersheds numbered in the 20s)
Existing Drainage Systems in Hayes Road and Nevers Road (subwatersheds
B2
numbered in the 20s
..: C Southern Property Boundary (subwatersheds numbered in the 30s)
Existing Drainage System in Graham Road—South(subwatersheds numbered in
..
D
_ the 40s)
Existing Drainage System in Graham Road—North(subwatersheds numbered in
E the 50s)
F Existing 42-inch Culvert(subwatersheds numbered in the 60s)
G Willow Brook Golf Course Twin Culvert(subwatersheds numbered in the 70s)
The method of predicting the surface water runoff rates and volumes utilized in this analysis is a
computer program entitled Hydraflow Hydrographs Extension for AutoCAD°Civil 3D`2016 by Autodesk,
Inc.,Version 10.5. The Hydrographs program is a computer model that utilizes the methodologies set
forth in the Technical Release No.55(TR-55)manual and Technical Release No.20(TR-20)computer
model,originally developed by the NRCS. The Hydrographs computer modeling program is primarily
used for conducting hydrology studies such as this.
The Hydrographs computer program forecasts the rates of surface water runoff and volume quantities
based upon several factors. The input data includes information on land use, hydrologic soil type,
vegetation,contributing watershed area,time of concentration,rainfall data,storage volumes,
exflltration rates,and the hydraulic capacity of structures. The computer model predicts the amount of
runoff as a function of time with the ability to include the attenuation effect due to dams,lakes,large
��`MILONE&MACBRO0M
ENGINEERING REPORT-THE ESTATES AT SOUTH WINDSOR FEBRUARY 2017
GRAHAM ROAD AND NEVERS ROAD-SOUTH WINDSOR,CONNECTICUT PAGE 6
wetlands,floodplains,and stormwater management basins. The input data for rainfalls with statistical
recurrence frequencies of 2, 10,25,50,and 100 years were obtained from the new NOAA National
Weather Service(NWS)Atlas 14 Volume 10. The corresponding rainfall totals are listed below:
24-Hour NOAA Precipitation Amounts
Storm Frequency Rainfall(inches)
2 Year 3.13
10 Year 4.96
25 Year 6.10
50 Year 6.98
100 Year 7.86
The Type III rainfall distribution with a 24-hour duration was used for the analysis in the town of South
Windsor,Connecticut. The NOAA rainfall amounts utilized in the hydrologic p.
are analysis rovided in the
Y
Appendix-of this report.
ort.
Land use for the site under existing proposed conditions
ons was determin
ed fro
m field survey,town
topographic mapping,and aerial photogrammetry. Land use types used in the analysis included woods,
grassed or open space,agricultural row crops,fallow,gravel,1/2-acre-lot and 1/3-acre-lot residential
properties,and impervious(paved/building)cover. Soil types in the watersheds were determined from
the CTDEEP Geographic Information System(GIS)database of the USDA-NRCS soil survey for the
Hartford County,Connecticut. For this analysis,the site was determined to contain Hydrologic Soil
Groups A, B,and.D,as classified by the NRCS. The different land uses and soil types were used to
determine runoff Curve Numbers(CN)for each subwatershed. The time of concentration(Tc)was
estimated for each subwatershed using TR-55 methodology,which was computed by summing all the
travel times through the watershed as sheet flow,shallow concentrated flow,and channel flow.
The existing conditions were modeled with the Hydrographs computer program to predict the surface
runoff rates and volumes for the various storm events at each analysis point. A revised model was
developed incorporating the proposed site conditions and the flow attenuation capability of the
proposed stormwater basins. Stormwater management for the project was achieved by routing the
stormwater runoff from the developed areas to the three proposed stormwater management basins.
Stormwater flow rates and volumes are mitigated by use of outlet control structures containing a
combination.of a primary rectangular weir,low flow orifices,and an overflow concrete weir.
All of the proposed basins have been designed to provide a minimum of 1 foot of freeboard during the
100-year storm event. All Hydrographs input computations and model results are included in the
Appendix of this report. The results summarized below were obtained from the Hydrographs model
outputs:
Y
"i,MILONE&MACBRO
ENGINEERING REPORT-THE ESTATES AT SOUTH WINDSOR FEBRUARY 2017
GRAHAM ROAD AND NEVERS ROAD-SOUTH WINDSOR,CONNECTICUT PAGE 7
Analysis Point A-Northeastern Property Boundary
Peak Flow Rates(cfs)*
Storm Frequency(years) 2 10 25 50 100
----2.06----- 4.8-4 _ 6.-0 _-- 14.93.- -_--24.86--_-- ----_-_- - -
Ex h I,
Proposed Conditions 0.60 2.38 3.77 4.93 6.14
*cfs=cubic feet per second
`;j
Runoff Volumes(acre-feet) i iI
Storm Frequency(years) 2 10 25 50 100 fli!
Existing Conditions 0.16 0.37 0.79 1.35 1.98
is
proposed Conditions 0.08 0.23 0.35 0.46 0.56
=i a
Analysis Point B1-Southeastern Property Boundary
Peak Flow Rates(cfs)*
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 0.43 3.73 13.14 20.81 58.65
Proposed Conditions 0.03 0.21 0.36 0.50 0.65
*cfs cubic feet per second
Runoff Volumes(acre-feet)
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 0.09 1.09 2.30 3.11 3.91
Proposed Conditions 0.01 0.02 0.04 0.05 0.06
Analysis Point B2-Existing Drainaee Systems in Haves Road and Nevers Road
t Peak Flow Rates(cfs)*
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 5.30 17.42 33.62 47.93 62.42
Proposed Conditions 5.11 16.11 24.22 32.27 43.42 i
*cfs=cubic feet per second
Runoff Volumes(acre-feet)
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 0.78 2.92 4.97 6.47 7.99
Proposed Conditions 0.74 2.70 4.56 6.21 7.95
EN
it
���MILONE&MACBROCI
ENGINEERING REPORT-THE ESTATES AT SOUTH( GRAHAM ROAD AND NEVERS ROAD WINDSOR
-SOUTH WINDSOR,CONNECTICUT FEBRUARY 201'
Anal is Point C-Southern Pro a PAGE g
Bounda
Storm Frequency(years) Peak Flow Rates cfs
Existing Conditions 2 10 25
Proposed Conditions 0.18 S0 100
0 82 -�3�4 ---1J8 -
- -*cfs=cubic feet per second
0.-04----- 0.22 2.24
0.36 0.48 0.62
Storm FrequencyRunoff Volumes acre-feet
(Years) 2
Existing Conditions 10 25 50
Proposed Conditions 0.03 100
0.08 0.01 0.13 0.17
0.02 0.04 0.05 0.21
.06
Anal is Point D-Existin Draina e Sfstern in Graham
Road-South
Storm FrequencyPeak Flow Rates cfs
(Years) 2
Existing Conditions 10 12S
Proposed Conditions 12.23 50 100
31.24 44.44
*cfs=cubic feet per second 2.17 7.84 54.98 65.72
12.22 15.83 19.60
Storm FrequencyRunoff Volumes acre-feet
(Years) 2
Existing Conditions 10 25 50
Proposed Conditions 1.80 4.3 100
1 6.08
0.34 1.00 7.50 8.98
1.51 1.93 2.37
Anal sis Point E-Existin Draina e S em in Graham Ro
ad-North
Storm Frequency(years) 2 10 Peak Flow Rates(cfsl*
Existing Conditions 25
Proposed Conditions 2.92 7.88 50 100*cfs=cubic 11.43 14.29 feet per second. 2.77 7.48 17.22
10.86 13.58 16.36
Storm FrequencyRunoff Volumes acre-feet
(Years) 2
Existing Conditions 10 25
50 300
.
Proposed Conditions 0.33 083
0.32 1.18 1.47
0.79 1.12 1.40 1.77
1.68
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��MILONE&MACBR00111
ENGINEERING REPORT-THE ESTATES AT SOUTH WINDSOR FEBRUARY 2017
GRAHAM ROAD AND NEVERS ROAD-SOUTH WINDSOR,CONNECTICUT PAGE 9
Analysis Point F-Existing 42-inch Culvert
i
Peak Flow Rates(cfs)*
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 18.67__
r poosed Conditions
F 8.58 37.85 59.55 83.54 109.45
*Cis=cubic feet per second
Runoff Volumes(acre-feet)
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 3.02 8.03 11.70 14.70 17.90
Proposed Conditions 1.55 5.40 8.54 11.20 14.10
ff
Analysis Point G-Willow Brook Golf Course twin culvert
Peak Flow Rates(cfs)*
Storm Frequency(years) 2 10 25 so 100
Existing Conditions 19.11 71.67 113.34 148.33 185.45
Proposed Conditions 8.81 52.49 87.82 123.10 161.88
*Cis=cubic feet per second
Runoff Volumes(acre-feet)
Storm Frequency(years) 2 10 25 50 100
Existing Conditions 3.18 9.83 15.00 19.40 24.00
Proposed Conditions 1.78 7.30 11.90 15.90 20.20
The summary of the results shows that no increases in peak flow rates and runoff volumes are
anticipated to any of the points examined in the detailed hydrology analysis..A decrease in flow rates
and volumes for each of the storm events modeled were achieved due to a planned stormwater runoff
collection system and the design of the stormwater management basins. The stormwater management
system achieves the goal of attenuating the peak runoff rates and volumes from the proposed site,thus
minimizing potential impacts to existing wetland areas,watercourses,storm drainage systems,and
developed areas downstream of the site.
i
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MILONB&MACBROOM
l
i
I '
5.0 WATER QUALITY MANAGEMENT
I
Water quality measures or BMPs are incorporated-into the s
—+ - -----treatmen measures described in this section will help tormwater management design. All of the
p maintain wat
from the proposed site. er quality of the stormwater runoff i
Stormwater runoff from the proposed site will be collected and conveyed
grassed swales or a subsurface piping drainage system. The drainage yst via overland flow through
em
With 2-foot sumps that will trap coarse sediment and debris before discharging will
a d Jude catch basins
and off the Site. At the discharge locations,protective riprap aprons will be ins all etention basins
Potential erosive velocity of the stormwater as well as trap sediments. ed to dissipate the
A sediment forebay is proposed'around the drainage pipe outlets into the Prop
ose
management basins. The sediment forebays will improve water qualityb trappingd stormwater
filtering coarse sediment and other pollutants. The forebays will be constructed u in oatables as well as
berm and a riprap splash pad. Riprap splash pads dissipate the potential erosive velocity of stormwater
p Ater =
entering the basin as well as trap sediment while the riprap filter berm will contain the emendi
a small area in the basin,allowing easy maintenance. t within
n
The stormwater management basins were sized following recommendations set forth
2004 Stormwater Quality Manual. The manual(Chapter 7)recommends methods f in the CTDEEP
r sizing stormwater
treatment measures with the WQV computations. The WQV addresses the initial stormwater runoff
ff
also commonly referred to as the"first flush"runoff. The WQV provides adequate volume to s H
initial 1 inch of runoff,which tends to contain the highest concentrations of potentialPollutantstore the
WQV has been provided within the volume of the proposed stormwater management bans be. The
first outlet discharge from the outlet control structures. All supporting calculationssins below the
provided as well as WQV computations have been included in the Appendix of this report a volume
A detailed Sediment and Erosion(S&E)Control Plan has been developed to mitigate t
impacts of the project during construction. The S&E Control Plan includes descriptive se ec�rt-term
concerning land grading,topsoiling,tempora specifications
vegetative cover selection and mulching,and erosion achecks.vDetails have been er,permanent vegetative
rovi a cover,
control measures with corresponding labels on the S&E control site plan. The S&E controlded s provided roly erosion
in accordance with the 2002 Connecticut Guidelines for SOil Erosion and Sediment Control. p ded are
Geotextile sediment filter fence will be used downgradient of the construction areas
to vent the
transport of sediment off the construction site. The sediment filter fencing will be'
fortified
e
hay bales along Graham Road to protect the downstream wetland areas and watercourses.Astone
staked
construction entrance has been provided at each of the proposed roadway entrances. Several s
temporary topsoil stockpile areas have been provided throughout the project site and are to be
encircled with sediment filter fencing. Water bars and stone check dams are proposed along
roadway to protect against potential erosive velocities along the roadway edge duringconstruction,the
inlet protection has been provided as well for each catch basin and yard drain inlet to ventsediment
and
from entering the storm drainage system during construction. Prevent sediment
���MILONE&MAcBRoo
. ENGINEERING REPORT-THE ESTATES a SOUTH WIND s
GRAM AD q D m�Ene-a-SOUTH w■Ds c ECT c T 2
< < . GE 1 :
Temporary d,vr,so berms and swales are prov de to direct the#omwkg runoff from the sl, et
several temporary sediment traps during construction and will include stone check dams t sow
ptn,laerosive vlociie . The proposed bmtratonbsinaraar not ineddt be used as
temporary sediment basin to avoid over compaction of the soil. The S&E co mrlaetob modified
with»s changing � � �
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IN:P.ND�,,t}0�;:�},1,m11SS}OA1
Wetland Delineation Report
Lot L024 Graham Road
South Windsor, Connecticut
March 6, 2017
MILONE &MACBROOM'
Engineering I Planning I Landscape Architecture I Environmental Science
Wetland Delineation Report
Lot L024 Graham Road
South Windsor, Connecticut
March 6, 2017
Prepared for: Prepared by:
Toll Land XVIII Limited MILONE& MACBROOM, INC.
Partnership 99 Realty Drive
42 Old Rid ebu Road MMI#1873-59-13
g ry Cheshire, Connecticut 06410
Danbury,Connecticut 06810 (203) 271-1773
www.miloneandmacbroom.com
Copyright 2017 Milone&MacBroom,Inc.
Wetland Delineation Report
TABLE OF CONTENTS
Page
1.0 INTRODUCTION...................................................................................................................1
2.0 EXISTING SOILS....................................................................................................................2
3.0 FIELD INVESTIGATIONS........................................................................................................3
4.0 CONCLUSION.......................................................................................................................5
APPENDIX
NRCS SOIL SURVEY MAP
WETLAND DELINEATION MAP
1R MILONE&MACBROOM°
Wetland Delineation Report MARCH
Page I
1.0 INTRODUCTION
On February 24,2017, Peter Shea, registered soil scientist with Milone& MacBroom, Inc. (MMI),
conducted a site inspection of a town-owned open space parcel located on Graham Road in South
Windsor, Connecticut. The subject parcel was inspected because of the need to install a new
stormwater discharge pipe on the parcel (see Figure 1). The new stormwater discharge pipe is required
for the construction of a proposed residential subdivision on parcels R022 and R024,which are located
across the road. The wetland delineation was completed in support of the Inland Wetlands Application
APP.#17-04P and in response to a request by Mr.Jeffrey Folger, Environmental/Conservation Officer, in
a letter dated February 17, 2017. Please note that our delineation work focused on the future location
of the new stormwater drainage pipe,and our delineation did not include investigations over the entire
open space parcel.
The proposed discharge pipe will be located on town-owned parcel L024 off Graham Road. The parcel is
currently a vacant wooded lot. Figure 1 is a depiction of the study area and shows the wetland
boundary delineated in the field. This report is limited to parcel L024 and does not include the proposed
subdivision lot. A soil report of the proposed subdivision lot(parcels R022 and R024)was provided in
the wetland application and completed by Highland Soils, LLC in September 2015.
Inland wetlands and watercourses within the area of the new stormwater discharge pipe were
delineated in accordance with the regulations of the Town of South Windsor,Connecticut,and the State
of Connecticut Inland Wetlands and Watercourses Act, CGS 22a-36 through 45. Regulated wetland
areas consist of any of the soil types designated by the National Cooperative Soils Survey as poorly
drained,very poorly drained, alluvial,or floodplain. Regulated watercourses consist of rivers; streams;
brooks; waterways; lakes; ponds; marshes; swamps; bogs; and all other bodies of water, natural or
artificial,vernal or intermittent, public or private, not regulated pursuant to sections 22a-28 to 22a-35
inclusive(tidal wetlands).
Weather conditions were clear, dry,and in general suitable for wetland delineation work.
Soils were examined using a spade and Dutch auger. Geospatial data was accessed via the United States
Department of Agriculture—Natural Resources Conservation Service (USDA-NRCS)web soil survey
mapping. The soil survey mapping is appended. The survey identified the following soil mapping units
with associated NRCS number(No.)in the project areas:
• Walpole sandy loam, poorly drained (13)
• Manchester gravelly sandy loam, excessively drained (37C, 37E)
��i MILONE&MACBROOW
Wetland Delineation R' • •
Page 2
2.0 EXISTING SOILS
Upland Soil
The upland soil at the site is derived from glaciofluvial deposits of stratified sand and gravel. These soils
formed in water-sorted gravelly and sandy material derived from a parent material consisting of acidic
red sandstone and shale conglomerate. Upland soils were not fully delineated in the field.
The Manchester series (37C and 37E) consists of very deep, excessively drained soil formed in sandy and
gravelly glacial outwash and stratified drift. They are nearly level to steep soils on outwash plains,
terraces, kames,deltas, and eskers. Slope ranges from 0 to 45 percent. Saturated hydraulic
conductivity is high or very high in the surface layer and subsoil and very high in the substratum. The
taxonomic class is sandy-skeletal, mixed, mesic Typic Udorthents.
Use and Vegetation: Most areas are forested or in brushy vegetation. Cleared areas are used for hay,
pasture, and silage corn. Small areas, mostly irrigated, are used for tobacco,vegetables,and nursery
stock. Many areas are in community development. Common trees are white, red, and black oak;gray
birch; aspen; and white and pitch pine. Gravel is commonly excavated from areas of these soils.
Wetland Soil
The mapped wetland soil found in the project area is the Walpole soil series. The series is typically
identified as a regulated hydric soil and was mapped by the NRCS at the site. Based on field inspection,
the Walpole soils were identified along the corridor of an intermittent watercourse and relatively flat
area in the central portion of the parcel. Wetland flags were used to delineate the area within the
vicinity of the proposed discharge line and are depicted on the attached site plan. Again,the wetland
boundary was delineated in the area of the proposed site work but was not fully delineated outside of
the immediate project area.
The Walpole series consists of very deep, poorly drained sandy soils formed in outwash and stratified
drift. They are nearly level to gently sloping soils in low-lying positions on terraces and plains. Slope
ranges from 0 to 8 percent. Saturated hydraulic conductivity is moderately high or high in the surface
layer and subsoil and high or very high in the substratum. The taxonomic class is sandy, mixed, mesic
Aeric Endoaquepts.
Use and Vegetation: Most areas are wooded. Cleared areas are used for hay and pasture. Drained
areas are used for silage corn and hay. The typical vegetation consists of a forested community with
canopy trees of red maple,American elm, and/or scattered black gum,swamp white oak, and yellow
birch and/or eastern hemlock. The shrub understory consists of spicebush, silky dogwood,and northern
arrow-wood with sweet pepperbush. The herb layer consists of cinnamon fern, royal fern,false
hellebore,violets,and wood-reed grass with skunk cabbage and sedges.
Q MILoNE&MAcftooma
Wetland Delineation ReportMARCH 2017
Page 3
3.0 FIELD INVESTIGATIONS
The fieldwork confirmed the soil survey mapping with the Walpole series soils identified within the
central portion of the parcel. An intermittent watercourse conveys stormwater runoff off site via a
reinforced concrete pipe located along the western boundary of the parcel.
Wetland Hydroloey
The wetland at the site is supplied by various water sources,which include the intermittent
watercourse, direct precipitation, and surface runoff from surrounding uplands.
Wetland Cover Type
The wetland resources present on and adjacent to the project site are described herein using the U.S.
Fish and Wildlife Service's(USF&W)wetland classification system described in Classification of Wetlands
and Deepwater Habitats of the United States(Cowardin et al., 1979). The predominant wetland type is
palustrine forested wetland with an intermittent watercourse that conveys surface flow westerly.
Palustrine Forested Wetland
Dominant vegetation includes red
male skunk cabbag a various, grasses,
sedges, sensitive fern, cat briar,
multiflora rose,and poplar.
A functional evaluation of the wetland
based on field observations is
summarized in Table 1. The first
column lists the functions generally
ascribed to wetlands;the second
column summarizes the rationale
used to determine whether these
functions are being performed within
the subject wetland and/or
watercourse.
Palustrine Forested Wetland
�0 MILoNE&MACBROOM'
WETLAND DELINEATION REPORT MARCH 2O17
LOT L024 GRAHAM ROAD,SOUTH WINDSOR,CONNECTICUT PAGE 4
TABLE 1
Functions and Values Assessment—Palustrine Forested Wetland
Functions and Values Comments
Ground Water Recharge/Discharge No—Groundwater seeps were not identified during the
time of delineation.
Flood Flow Alteration(Storage& No—The wetland system is not mapped by the Federal
Desynchronization) Emergency Management Agency(FEMA).
Fish&Shellfish Habitat No—The intermittent watercourse does not provide
appropriate depths of water to support fish habitat.
Sediment/Toxicant Retention Yes—Sediment deposition was observed within the
intermittent watercourse.
AAA Nutrient Removal/Retention/ Yes—High stem density vegetation provides nutrient
fW Transformation removal/retention.
Production Export(Nutrient) Yes—An intermittent watercourse is present,which may
transport nutrients from the wetland to the west.
Sediment/Shoreline/Stream Bank
Stabilization No
Yes but limited—The wetland is located between existing
residential developments to the north,east,and south.
Wildlife Habitat The wetland does provide wildlife habitat for reptiles,
amphibians, mammals,and insects that may be disturbed
by the proximity of the existing residential homes and
roadway.
Recreation(Consumptive&Non- No—The wetland system is not readily accessed and is
Ar Consumptive) located between residential communities.
AN No—The wetland does not provide any
Educational Scientific Value educational/scientific value.
Uniqueness/Heritage No
No—The wetland is located between residential
qP Visual Quality/Aesthetics communities and does not provide a visual aesthetic
wetland community.
ES Endangered Species No—The project area is not located within the State of
Connecticut Natural Diversity Data Base polygon.
The principal functions and values of the wetland system at this location include the following:
• Nutrient removal
• Sediment/toxicant retention
��g�MILONE&MACBROOM'
WetlandOf i
Delineation Report
Page 5
4.0 CONCLUSION
The appended wetland delineation maps and site plans depict the wetland boundary described by MMI.
The flagged areas are representative of wetland soils flagged within the immediate area of the proposed
discharge piping in support of the wetland application. The Walpole mapped soil series was confirmed
present within the central portion of the subject parcel with an intermittent watercourse conveying flow
westerly off site. The wetland community is described as a palustrine forested wetland with primary
functions of nutrient removal and sediment/toxicant retention.
1873-59-13-m r317-rpt
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NRCS Soil Survey Map.
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3 Soil Map—State of Connecticut 3
(Joseph Lane,So.Windsor)
al°sr m"N Mn7MOM 70M 7D290D 70M 70MOD 70M 70330D 7a too 7035DD�
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USDA Natural Resources Web Soil Survey 1/10/2017
Conservation Service National Cooperative Soil Survey Page 1 of 3
Soil Map—State of Connecticut
(Joseph Lane,So.Windsor)
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) Spoil Area The soil surveys that comprise your AOI were mapped at
Area of Interest(AOp d 1:12,000.
Stony Spot
Soils
Soil Map Unit Polygons Very stony spot Warning:Soil Map may not be valid at this scale.
+ Wet spot Enlargement of maps beyond the scale of mapping can cause
.�■ Soil Map unit Lines misunderstanding of the detail of mapping and accuracy of soil
® Soil Map Unit Points C1 Other line placement.The maps do not show the small areas of
0. Special Line Features contrasting soils that could have been shown at a more detailed
Special Point Features scale.
V Blowout Water Features
Borrow Pit
1.4..- Streams and Canals Please rely on the bar scale on each map sheet for map
measurements.
Transportation
Clay Spot 444 Rails Source of Map: Natural Resources Conservation Service
O Closed Depression Web Soil Survey URL:
rV Gravel Pit Interstate Highways Coordinate System: Web Mercator(EPSG:3857)
0.1po US Routes Maps from the Web Soil Survey are based on the Web Mercator
Gravelly spot Major Roads projection,which preserves direction and shape but distorts
Ij1 Landfill ti distance and area.A projection that preserves area,such as the
Local Roads Albers equal-area conic projection,should be used if more
A. Lava Flow Background accurate calculations of distance or area are required.
Aj, Marsh or swamp . Aerial Photography This product is generated from the USDA-NRCS certified data as
Mine or Quarry
of the version date(s)listed below.
Soil Survey Area: State of Connecticut
Miscellaneous water Survey Area Data Version 15,Sep 28,2016
O Perennial Water Soil map units are labeled(as space allows)for map scales
V Rock Outcrop 1:50,000 or larger.
+ Saline Spot Date(s)aerial images were photographed: Mar 28,2011—May
d.a Sandy Spot 12,2011
The orthophoto or other base map on which the soil lines were
Severely Eroded Spot compiled and digitized probably differs from the background
Sinkhole imagery displayed on these maps.As a result,some minor
Slide or Slip shifting of map unit boundaries may be evident.
�p
Sodic Spot
USDA Natural Resources Web Soil Survey 1/10/2017
Conservation Service National Cooperative Soil Survey Page 2 of 3
Soil Map—State of Connecticut Joseph Lane,So.Windsor
Map Unit Legend
State of Connecticut(CT600.1
Map unit Symbol Map Unit Name Acres in AOI Percent of AOI
13 Walpole sandy loam,0 to 3 3.7 3.9%
percent slopes
15 Scarboro muck,0 to 3 percent 0.8 0.8%
slopes
32A Haven and Enfield soils,0 to 3 8.7 9.2%
percent slopes
32B Haven and Enfield soils,3 to 8 18.1 19.1%
percent slopes
37C Manchester gravelly sandy 5.7 6.0%
loam,3 to 15 percent slopes
37E Manchester gravelly sandy 0.8 0.8%
loam,15 to 45 percent
slopes
66B Narragansett silt loam,2 to 8 40.4 42.8%
percent slopes
66C Narragansett silt loam,8 to 15 0.4 0.4%
percent slopes
232B Haven-Urban land complex,0 15.9 16.9%
to 8 percent slopes
Totals for Area of Interest 94.6 100.0%
USDA Natural Resources Web Soil Survey 1/10/2017
Conservation Service National Cooperative Soil Survey Page 3 of 3
Wetland Delineation Report MARCH 2017
WETLAND DELINEATION MAP
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Engineering,Planning,
Landscape Architecture
and Environmental,Science
' MILONE &MACBROOM-
March 7, 2017
Mr.Jeffrey H. Folger
Environmental Planner/Conservation Officer
Town of South Windsor
1540 Sullivan Avenue
South Windsor,CT 06074
RE. Saint Margaret Mary Property
South Windsor,Connecticut
MMI#1873-59
Dear Mr. Folger.
We are in receipt of your memorandum addressed to Attorney Joseph Williams of Shipman and
Goodwin,dated February 17, 2017,and offer the following responses to your comments:
C1. A soil report has been received showing soil types present on the main development site. An
additional soil report must be submitted for the Town Owned Open Space site where the
stormwater discharge pipe is proposed to be located. This should include both upland and
hydric soil types.
R1. Attached you will find an Inland Wetlands Delineation report for the wetland and watercourse
system located on the town-owned open space property.
C2. The soil types listed in the soils report consist of a red sandstone parent material with a
significant silty component. This will result in "red water" being generated as a part of the
runoff during the construction period which under normal circumstances will take time to settle
out of the water column. Additional filtration measures will be needed and maintained during
construction to prevent this discharge in to the receiving watercourse.
R2. Comment noted.
C3. A report on the wetland functions and values should be submitted evaluating the project's
potential impacts to wetland function and water quality.
R3. The inland wetlands delineation includes a wetland functions and values assessment.
C4. There is a concern that stormwater exiting from the outlet of the pipe on the Open Space will
erode a channel prior to entering the watercourse to the west. More information is required to
Milone&MacSroorn,Inc.,99 Realty Drive,Cheshire,Connecticut 06410 (203)271-1773 Fax(203)272-9733
H-w1A,:m iloneandtnacbroom.corn
Connecticut.Maine•Nfassachusetts•New Hampshire•New York•South Carolina • Vermont
Mr.Jeffrey H.Folger
March 7,2017
Page 2
determine the travel path and the distance where sheet flow overland will concentrate to
channel flow.
R4. The outlet of the storm drainage system has been relocated further down the slope. The
outlet is located at a location where flow will enter the existing channel and drain directly
through the downstream culvert. A preformed riprap scour hole has been designed at the
outlet of the drainage discharge. The scour hole will reduce the velocity of the stormwater as
it exits the system. it is our professional opinion that this system as designed will not result in
erosion downstream in the channel.
C5. The receiving watercourse must be evaluated to determine the stability of its banks under
current conditions and with the addition of the proposed flow.
115. The hydrology report indicates that the downstream channel will actually have less flow under
proposed conditions than existing conditions. The reductions in flow range from 54%for a
2-year storm event to 17%for a 100-year storm event. Therefore,it is our professional
opinion that the project will have no adverse impact on the stability of the downstream
watercourse.
C6. Please extend the flow path within trap#7.
R6. Comment noted.
C7. Perimeter erosion controls must be installed between the proposed eastern berm and Nevers
Rd.
R7. Comment noted—erosion controls will be added to the plans.
Please feel free to contact me should you need any further information.
Very truly yours,
MILONE & MACBROOM, INC.
Daniel J. Kroeber, P.E.,Associate
Lead Project Engineer,Civil
1873-59-mr617-1tr
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To_� O-P s-ate ?d&U&ot
1540 SULLIVAN AVENUE• SOUTH WINDSOR, CT 06074
�f�OSOR-CO � TELEPHONE(860) 644-2511
To: Atty. Joseph Williams
Shipman and Goodwin
One Constitutional Plaza
Hartford, CT 06103-1919
From: Jeff
rey H. Folger—Environmental Planner/Conservation Officer
Date: March 8,2017
Re: App. #17-04P -Review of the Estates at South Windsor residential subdivision—Revised plans dated
03/03/17.
I have reviewed the proposed plan with the following additional comments:
I had a chance on Wednesday to examine the stormwater outfall location in the field. The terminus
location of the pipe structure is acceptable. The travel path of water from the proposed plunge pool will
follow a circuitous path for approximately 50 feet and enter the existing watercourse along an existing,
natural leak-off area. I am recommending that the travel path be supplemented with a dense understory
shrub planting (bare root) suitable for the area. This would provide the benefit of stabilizing the soil and
serve to add another measure to uptake nutrients in the stormwater discharge.
cc. Town Engineer; Director of Planning
MEMORANDUM
To: South Windsor Inland Wetland Agency/Conservation Commission
From: Jeffrey Folger, Environmental Planner, Conservation Officer
Date: 03-09-17
Review of the proposed Toll Bros. subdivision,plans dated 03/03/17.
The project is to create a 45 building lot, single family subdivision on 46.46 acres.
Proposed regulated activities include the installation of a stormwater discharge pipe ad
outfall within the Upland Review Area. (URA). The proposed disturbance will be
approximately 3200 sgft(.07 acres)within the URA.
Site: The site is located in the Podunk River watershed. The parcel is comprised of 46+
acres. Currently the site is an agricultural field. A road cuts through the property from
Graham Hill Road to Nevers Rd along the northern property boundary.
The parcel fronts on both Graham and Nevers Roads. There is a ridge running south to
north through the center portion of the site. The topography on this area slopes
moderately from east to west.
Due to decades of past agricultural use,the topsoil on the higher portions of the parcel
has eroded away exposing the reddish subsoil. There are no wetland soils on this
property.
The proposed open space subdivision would result in 45 residential building lots, and
approximately 20.14 acres for open space. The proposed access road connects Graham
Road to Nevers Road.
An additional parcel is also involved with the application. This is an 11 acre parcel
owned by the Town as open space. The land is located between Skyline Drive and
Greenfield Drive and parallels Graham Road behind the existing houses fronting on
Graham. It forms a shallow ravine that runs south to north to Norma Rd and then runs
west, paralleling Greenfield to the Willowbrook Golf Course. The parcel is down slope
of the subject parcel and as such will be used to receive stormwater runoff from the
proposed development. A 50-foot strip fronts onto Graham opposite the subject parcel.
The applicant proposes to install a 24"pipe that will convey stormwater from the
proposed detention basin to the watercourse on the open space parcel.
There are areas of wetlands on the open space parcel associated with the watercourse that
runs through the property onto the golf course property to the west and ultimately flows
to the Podunk River. The watercourse would be considered an intermittent watercourse
that originates behind the houses in the Skyline Drive/Graham Road area. Three small
pipes (12", 15", and 18"respectively) discharge road runoff from Graham to the
watercourse. These pipes also collect,via catchbasins, and transport existing surface
runoff from the entire western portion of the Toll Bros. site. This section of road has
been an area concern due to inadequate drainage and water flowing over Graham due
heavey storm events from the farm field. Additional water enters the watercourse from
surface runoff from houses on Skyline, Graham, and Greenfield, as well as exfiltrated
groundwater. While the watercourse is dry most of the time,neighbors have told me that
during storm events the channel can become quite flashy. The banks of the watercourse
are relatively stable.
The adjacent wetlands would be considered a forested wetland type, dominated by Red
maple and cottonwood in the overstory,with spicebush, summersweet and multiflora rose
skunk cabbage, and jack in the pulpit in the understory. Major functions would be
nutrient and sediment assimilation and trapping, stormwater conveyance, and
groundwater exfiltration. Wildlife habitat is present, but limited due to the residential
development surrounding the ravine.
Stormwater is planned to drain to catchbasins with 2-foot sumps and head toward one of
three different wet detention basins located throughout the site. The eastern two basins
are designed in tandem with the outermost basin serving as a final "polishing"for water
quality. The basin on the western side and the final basin on the east side have the
underlying soils suitable for a good infiltration opportunity. The basins will have
underdrains installed to minimize mosquito breeding opportunities. Sediment sumps are
present at the inlets of each basin. Outlet structures are designs with small orifices to
meter accumulated water out slowly. The three basins will be located in open space areas
and will be Association owned.
Impacts: The soils on the property to be disturbed are listed as Narragansett silt loam
and Haven sandy loam. Both of these soils were formed from the Triassic sandstone
parent material similar to the material found along the Buckland Road section of South
Windsor and Manchester. They have an erosion potential listed as moderate. Several
cuts and fills are proposed to accommodate the access road and several of the building
lots. I anticipate that runoff will contain fine particulates that can stay I suspension for
some time. The erosion control plan shows a good system of interior controls consisting
of earthen diversion berms and excavated sediment traps to be installed in front of the
perimeter haybale reinforced silt fencing.
I have requested that additional filtering structures be placed before the outlets to the
detention/infiltration basins.
The project is proposed to be constructed in two phases to minimize disturbances. The
project will start from Graham Road and proceed east to Nevers..
Portions of the site have been show through soil testing to contain agricultural pesticides.
A remediation plan has been developed to sequester the contaminated soil within two
earthen berms; one along Graham and one along Nevers Road. Clean topsoil will be
placed as a top layer and seeded with a meadow grass mix.
Stormwater Management:
Stormwater management is proposed to be accomplished through deep sump catchbasins
to detention/infiltration basins. The eastern side of the site will be discharged from the
basin to the Town drainage system in Nevers Road. The western portion of the site will
be discharged from the basin to the Town's open space parcel via a long pipe system to a
plunge pool prior to the intermittent watercourse. The soils report indicates that the
opportunity for infiltration is very good in the two detention basins located on either side
of the site. Outlet structures area designed to discharge water at a very slow rate, and will
provide for extended residence time. The water quality volume(WQV) within the basins
conforms with the recommended sizing from the CT Stormwater Guidelines. The
stormwater model shows a significant reduction in flow rates in the watercourse post
development.
Open Space: Twenty acres of open space are proposed. An approx. fourteen acre
portion will be retained along Nevers Rd. This area can continue to be utilized as an
agricultural field depending on the final grading. The Open Space Task Force has
recommended that the open space not be owned by the Town..
Postal Service"' -A
o RECEIPT
Ir CERTIFIED
ca Domestic Mail Only
WN Sf
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c " Sot ,aye rV Postage $
a m
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1540 SULLIVAN AVENUE • SO m
SOR•GO O Return Receipt Fee Postmark
TEI C3 (Endorsement Required) Here
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Restricted Delivery Fee
C3 (Endorsement Required)
Certified #70142120000332144389 nj
rl Total Postage&Fees
rLJ
March 17, 2017 se
StreetYX i ------
Attorney ��/�1�-�" )
Joseph P. Williams or PO Box No. �I �h kdi �//� -
Shipman and Goodwin Q ;ta-----P+4111-JJJ_ -__ L , IXJI 1
One Constitution Plaza
Hartford, CT 06103-1919 PS Form 3800, '
RE: Appl. #17-04P —The Estates at South Windsor— R022 & R024 Graham Rd and L024 Graham Rd &
L005 Norma Rd
Dear Attorney Williams:
At the March 15, 2017 regular meeting, the Inland Wetlands Agency/Conservation Commission approved
Appl. #17-04P—Toll Land 18 Limited Partnership, The Estates at South Windsor—R022 and R024
"Graham Rd and L024 Graham Road and L005 Norma Road—Inland Wetlands/Conservation
Commission application for approval of a 45-lot residential subdivision and associated improvements
located easterly of Graham Rd and southerly of Joseph Lane. Rural Residential (RR) and A-20
Residential Zone, with the following conditions:
1. The final approved copy of the entire set of plans and this letter reproduced thereon must be
submitted to the Planning Department. This must be completed within 65 days of approval prior
to any construction activity on the site. Plans submitted to Planning & Zoning Commission shall
be considered having met this requirement.
2. The applicant shall indemnify and hold harmless the Town of South Windsor against any liability,
which might result from the proposed operation or use.
3. The permit is valid for five years and shall expire on March 15, 2022. It is the
landowner(s)/applicant(s) responsibility to track expiration dates and notify the Commission of a
renewal request at least 65 days prior to expiration.
4. A bond shall be collected in the amount of$50,000 to ensure proper placement and maintenance
of erosion and sediment controls; a bond shall be collected in the amount of $30,000 for
installation and maintenance of stormwater controls; and a bond shall be collected in the amount
of $10,000 for the installation and maintenance of wetland plantings through three growing
seasons after the initial installation of the plants.
5. The density of the bare root plantings at the stormwater outfall pipe shall be increased to two-foot
on center.
6. Lot #43 shall be reserved as an alternate space for an erosion and sediment control basin until
Phase I is developed and/or stabilized to a point where Town staff in consultation with the
developer can determine that storm water runoff entering the permanent western detention basin
will not compromise the infiltrative qualities of that basin.
7. All approvals required must be obtained and submitted prior to any activity on the site. j
8. A contact person shall be identified on the plans.
Very truly yours,
INLAND WENDS AGE E��QNSERVATION COMMISSION
- � f
lizabeth A. Warren, Chairperson
EAW/dt
cc: Director of Planning, Chief Building Official