Cameron’s Run

January 2017 1

Attachment 1: Narrative, Location Map, and Soils Map

Cameron’s Run – Lot #2 & #36 Re-development

Introduction We are writing on behalf of Cameron’s Run, LLP to apply for a State Stormwater Discharge

Permit pursuant for the above referenced project.

The new impervious co-mingles with the previously permitted impervious for discharges SN-

001 and SN-005 of permit (4172-9010). Please note that there are no changes to outfalls SN-

002, SN-003 or SN-004 of the previously approved permit.

Project Description The project proposes redevelopment of Lots #2 and #36 of the Cameron’s Run Residential

Subdivision. The lots were previously used for wastewater disposal and shared community

space. Lot #2 is proposed to be accessed from Erin Court and will make use of a shared

driveway providing access to three (3) new units. Lot #36 is proposed to be accessed from

Hillary Lane and will make use of a shared driveway providing access to two (2) new units.

The new impervious surface associated with the new units and driveways is 0.37 acres. This

project requires an amendment to existing Stormwater Discharge Permit 4172-9010 because

of the new developed lots and increase in impervious surface.

Existing Condition This project initially involved a total of 11.2 acres of land, with 35 existing single family

homes on individual lots and 13 existing planned residential development units on a separate

lot. The project consists of sandy soils with a high permeability rate, therefore the majority of

storm events infiltrate rather than producing runoff. Events that do produce runoff are

directed to the southern portion of the site where they drain to an unnamed tributary of

Mallets Creek. The site, as currently exists, is generally very flat with the majority of roads

and front yards at approximately 1%. The rear and side yards (including existing stormwater

infrastructure) vary from gentle slopes to some areas of 1V:3H. Soil mapping units across the

site include Adams and Windsor loamy sands. These soils are well drained and are

hydrologic soil group A rated.

Test pits logs which include soil texture, evidence of seasonal high groundwater and depth to

bedrock were completed for the project site. Seasonal high groundwater was located at a

depth of 12’, evidence of bedrock was not found. In addition, a number of infiltration tests

were performed across this site yielding a range of infiltration rates from 25 inches/hour to

300 inches/hour.

Cameron’s Run

January 2017 2

Proposed Stormwater System: i) 4.14 acres of impervious surface were originally permitted, all of which has been

constructed at this time. The proposed impervious associated with this application is

0.37 acres, make the total impervious for this project 4.51 acres.

ii) Receiving Body: Unnamed Tributary to Mallets Creek/Groundwater

iii) Fish Habitat Designation for Receiving Water: Cold

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: WQv for discharge point 001 is met with Disconnection of

Rooftop Runoff Credit and STP Infiltration Basin.

2. S/N 005: WQv for discharge point 005 is met with Disconnection of

Rooftop Runoff Credit and STP Infiltration Basin.

(b) Groundwater Recharge Treatment Standard:

1. S/N 001: REv Treatment Standard for discharge point 001 is met with

STP Infiltration Basin.

2. S/N 005: REv Treatment Standard for discharge point 005 is met with

STP Infiltration Trench and STP Infiltration Basin.

(c) Channel Protection Standard (CPv):

1. S/N 001: CPv for discharge point 001 is infiltrated in the Infiltration

Basin.

2. S/N 005: CPv for discharge point 005 is infiltrated in the Infiltration

Basin and Infiltration Trench.

(d) Overbank Flood Protection Standard (Qp10):

1. S/N 001: Due to the nature of the site the pre-construction runoff for

the 10-year storm was assumed to be 0.0 CFS. Qp10 for discharge

point S/N 001 is met with STP Infiltration Basin by infiltrating the

entire 10-year storm (0.0 CFS runoff).

2. S/N 005: Due to the nature of the site the pre-construction runoff for

the 10-year storm was assumed to be 0.0 CFS. Qp10 for discharge

point S/N 005 is met with STP Infiltration Basin & STP Infiltration

Trench by infiltrating the entire 10-year storm (0.0 CFS runoff).

(e) Extreme Flood Protection Standard (Qp100):

Qp100 is waived for the project on the basis that the total impervious area

will be less than 10 acres.

Cameron’s Run

January 2017 3

The following items are attached for review:

• Complete NOI form & cover letter

• Attachment 1: Narrative: Narrative, Location Map and Soils Map.

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

discharge point.

• Attachment 3: Modeling: Runoff modeling, 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.

30,000

1,524.0

Natural Resources AtlasVermont Agency of Natural Resources

19,650

© Vermont Agency of Natural Resources

998.0

1:

WGS_1984_Web_Mercator_Auxiliary_Sphere

Meters998.00

NOTES

Map created using ANR's Natural Resources Atlas

LEGEND

499.00

vermont.gov

DISCLAIMER: This map is for general reference only. Data layers that appearon this map may or may not be accurate, current, or otherwise reliable. ANR and

the State of Vermont make no representations of any kind, including but notlimited to, the warranties of merchantability, or fitness for a particular use, nor

are any such warranties to be implied with respect to the data on this map.

December 16, 2016

THIS MAP IS NOT TO BE USED FOR NAVIGATION

1" = 1638 1cm = 196Ft. Meters

Waterbody

Stream

Parcels (where available)

Town Boundary

10,000

508.0

Natural Resources AtlasVermont Agency of Natural Resources

6,550

© Vermont Agency of Natural Resources

333.0

1:

WGS_1984_Web_Mercator_Auxiliary_Sphere

Meters333.00

NOTES

Map created using ANR's Natural Resources Atlas

LEGEND

166.00

vermont.gov

DISCLAIMER: This map is for general reference only. Data layers that appearon this map may or may not be accurate, current, or otherwise reliable. ANR and

the State of Vermont make no representations of any kind, including but notlimited to, the warranties of merchantability, or fitness for a particular use, nor

are any such warranties to be implied with respect to the data on this map.

December 16, 2016

THIS MAP IS NOT TO BE USED FOR NAVIGATION

1" = 546 1cm = 66Ft. Meters

Soils - Hydrologic Groups

A

A/D

B

B/D

C

C/D

D

Waterbody

Stream

Parcels (where available)

Town Boundary