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Attachment 1: Narrative, Location Map, and Soils Map

Wake Robin Phase III Renovation and Expansion

1. Introduction

Watershed Consulting Associates, LLC is writing on behalf of the Wake Robin Corporation

to apply for a Vermont State Stormwater Discharge Permit pursuant to General Permit 3-

9015 for the above referenced project.

2. Project Description

The Wake Robin Phase III Renovations and Expansion project is located at 200 Wake Robin

Drive in Shelburne, Vermont. The Wake Robin Life Care Community is a residential area of

cottages and apartments with a few community spaces and a health care building. This

community is located off the public road of Bostwick, a short drive from Route 7. The Maple

Apartment Building is a new independent living multi-unit apartment that is proposed west

of the existing Linden Health Center. This proposed expansion consists of a building with 38

new apartments with seven different styles of floor plans, an access drive, and parking areas.

This new apparent building, access drive, and parking will be located on currently

undeveloped woodland area. A new water tank is proposed near the existing tank at the east

most edge of the property and two building renovations are also proposed on the Community

Center and Linden Health Center. The existing stormwater pond will be expanded to treat

this new and redeveloped development. The project is primarily new development with a

small portion of redevelopment. 1.98 acres of new impervious will be created and 0.20 acre

of existing impervious will be redeveloped. The project is under jurisdiction of the

Environmental Protection Rules, Chapter 18.

3. Existing Condition

The Wake Robin Life Care Community is currently developed with residential areas,

community spaces, and a health care building. The project is covered under an existing

stormwater permit, 3090-9010.R. There is a large portion of undeveloped woodland area on

the western side of the site where the new apartment building is proposed for development.

The scope of the proposed expansion project impacts one of the previously permitted

discharge point, S/N 003. This discharge point is referred to as S/N 001 in the present

analysis. Stormwater from DA_1 and DA_2 discharge to S/N 001. Runoff in DA_1 currently

sheet flows west though the undeveloped woodland to a 2’x2’ box culvert. Runoff from

DA_2 currently passes through a series of storm lines and catchbasisns on the upper reaches

of the property. As this runoff travels west the stormwater day lights on the property and

continues to flow west through a channel that leads to an existing stormwater detention pond.

The pond has a controlled outlet structure that discharges to its north and will travel via

overland to the west of the property finally discharging through the same 2’x2’ box culvert as

DA_1. The receiving water that all runoff from the site drains to is an unnamed tributary to

Lake Champlain. Soils on this site are defined as hydrologic groups C and D and a

characterized to have low infiltration rates. Slopes are generally moderate sloping to the

west.

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4. Existing Stormwater System

Stormwater runoff from paved roads, parking areas, and rooftops travel via overland flow

and by stone lined ditches, a grass channel, and catch basins to a wet pond with an outlet

control structure discharging overland and through a 2'x2 ' box culvert under CV railway.

The existing overland flow disconnection and grass channel treatment will be preserved

under this proposed expansion. The existing wet pond will be expanded to accommodate the

increased runoff from the proposed project.

5. Proposed Stormwater System:

i) Description of Impervious Area: The future conditions at Wake Robin include 11.03

acres of impervious cover – 1.98 acres of expanded impervious area and 0.20 acres of

redeveloped impervious area.

ii) Receiving Body: Lake Champlain

iii) Fish Habitat Designation for Receiving Water: Cold Water

iv) Description of compliance with each of the 5 Unified Sizing Criteria in the 2002

VSMM Vol. I including the treatment practices or credits/waivers used to meet each

of the following standards:

(a) Water Quality Treatment Standard (WQv):

1. S/N 001: The required WQv is met by the permanent pool provided in

the expanded wet detention basin. The rooftop disconnection credit

and grass channel providing treatment for existing impervious surfaces

will remain.

(b) Groundwater Recharge Treatment Standard: The required GRv is provided

by 3 bioretention areas that will collect and infiltrate runoff from four

proposed garage rooftops. The rooftop disconnection credit and grass

channel providing infiltration for existing impervious surfaces will remain.

(c) Channel Protection Standard (CPv):

1. S/N 001: CPv is provided by detention a and controlled release of the

1-year, 24-hour storm within the expanded wet detention basin.

(d) Overbank Flood Protection Standard (Qp10) :

1. S/N 001: Overbank flood protection is met by detention provided

within the expanded wet detention basin.

(e) Extreme Flood Protection Standard (Qp100) :

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1. S/N 001: Extreme flood protection is met by detention provided within

the expanded wet detention basin.

The following items are attached for review:

Complete NOI form

Attachment 1: Narrative: Narrative, Location Map, Soils Map, and Impervious

Change Map.

Attachment 2: Worksheets: Schedule A’s, waivers and BMP worksheets- grouped by

discharge point.

Attachment 3: Modeling: Runoff modeling and calculations demonstrating compliance

with the applicable treatment standards.

Attachment 4: Plans: Pertinent plan sheets with all required information outlined in

Part 5 of the General Guidance Document.

A check in the amount of $2,114.80 Payable to “State of Vermont”.

_̂Site Location

Site LocationWake Robin Life Care Community

Shelburne, Vermont Map Produced: 11/7/20160̄ 0.50.25 Miles

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VT

0 10050 Miles¯

DA_2

DA_1

Soils MapWake Robin Life Care Community

Shelburne, Vermont Map Produced: 11/7/20160̄ 300150 Feet

LegendFuture DAFuture Impervious

Hydrologic Soil GroupBCD

S/N001

DA_2

DA_1

Impervious ChangeWake Robin Life Care Community

Shelburne, Vermont Map Produced: 1/3/20170̄ 400200 Feet

LegendPost Drainage Area

_̂ Post Discharge PointPost TCCulvertNHD Stream Centerline

Future LanduseSmall Landscaped AreaUndeveloped AreaWaterNew/Expanded ImperviousRedeveloped ImperviousExisting Impervious

2'x2' Box Culvert

Land Use Acres New/Expanded Impervious 1.98Redeveloped Impervious 0.20Remaining Impervious 8.85

Sum Impervious 11.03

Wet Pond (P-2)

(F-5)(F-5)Bioretention Area (F-5)

Grass Channel (O-3)

(3.2)(3.2)Rooftop Disconnection (3.2)