20071995 Ver 1_More Info Received_20090115

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STV/Ralph Whitehead Associates
1000 West Morehead Street, Suite 200
Charlotte, North Carolina 28208
[phone] iax:[phone]
January 14, 2009
Via FEDERAL EXPRESS
North Carolina Division of Water Quality
Winston-Salem Regional Office
585 Waughtown Street
Winston-Salem, NC 27107
Attention: Ms. Sue Homewood D[A& 9 0 V 1
Subject: Response to Request for Additional Information
Hartley Drive Widening and Extension JAN 15 2009
City of High Point, Guilford County, NC
DWQ #07-1995 [)ENR-WATER WAUTY
USACE Action I.D. #2006-20795 WETIANOSANDSTORMWATERBRANCM
RWA Project No. 3202000
Dear Ms. Homewood,
This letter has been prepared to address the request for additional information that has been
received from the North Carolina Division of Water Quality (DWQ) regarding the above
referenced project. A response to each of the requests that were made is presented. A copy of the
letter requesting the additional information is included in Attachment A for convenience. As you
are aware, a meeting was held at the DWQ Winton-Salem office on December 9, 2008 to discuss
this Request for Additional Information, and outline a strategy for complying with the DWQ
stormwater regulations. As a result of this being a linear transportation project, the following
comment responses were generally discussed and agreed to during that meeting.
1. As stated in the DWQ Stormwater BMP Manual for dry extended detention basins (page 17-
2) "Seasonally high groundwater table must be at least 2 feet below the bottom of the basin. "
The Dry Extended Basin Supplement Sheet also notes that the SHWT elevation must be
known in order to complete this checklist. Please provide this information for all three
detention basins.
A subsurface exploration report has been prepared by STV/Ralph Whitehead Associates
(STV/RWA) for the Hartley Drive Widening and Extension project. Soil Boring B-10 is
located on the YMCA property very close to the proposed Detention Basin #1 (Attachment B
- Exhibit 1). The boring extended to a depth of 9.0 feet. At this location, the water table was
not encountered (Attachment B - Exhibit 2). Therefore, based on a ground surface elevation
of 341.3 feet, the water table elevation would be less than elevation 832.3 feet. The proposed
basin bottom elevation is 836 feet providing an estimated 3.7 feet between the bottom of the
basin and the water table.
an employee-owned company providing quality service since 1912
Ms. Sue Homewood
January 14, 2009
Page 2
Soil Boring B-30 is located adjacent to the existing basin west of Ingleside Drive, very close
to the proposed Detention Basin #2 (Attachment B - Exhibit 3). The boring extended to a
depth of 9.9 feet. At this location, the water table was not encountered (Attachment B -
Exhibit 4). Therefore, based on a ground surface elevation of 835 feet, the water table
elevation would be less than elevation 825.1 feet. The proposed basin bottom elevation is
837.5 feet providing an estimated 12.4 feet between the bottom of the basin and the water
table.
STV/RWA was unable to perform soil borings in the western end of the project corridor, in
the vicinity of Detention Basin #3, due to the existing landowners refusing permission to
access the area with a drill rig. Existing soil survey data and topographic data for the area
was therefore used to determine water table elevations. The soils in the area of Detention #3
are Poindexter and Zion sandy loams, 8 to 15 percent slopes (PnD). These soils are listed as
having a water table >6 feet below the surface elevation. Additionally, by using the existing
topographic data, we can compare the proposed detention basin bottom elevation to the
proposed detention basin outlet elevation of 839 feet. The proposed basin bottom elevation is
846 feet providing an estimated 7 feet between the proposed bottom of the basin and the
water table.
2. As stated in the DWQ Stormwater BMP Manual for dry extended detention basins (page 17-
2) "A forebay is required if the design volume to the facility is over 10 acre-inches. " For
Basin #1, the Dry Extended Basin Supplement Sheet also notes that the total runoff volume
captured by the basin indicates that a forebay is required. Please modify the design of Basin
#1 to include a Forebay.
Basin #1 is located adjacent to the YMCA's soccer field and any expansion to the basin
would compromise the playing field. The proposed outfall to Basin #1 drains an already
developed corridor; there is existing commercial development along Main Street and this
portion of Hartley Drive is already paved. The project proposes to widen this section of
Hartley Drive and add curb & gutter. The basin will provide peak runoff control and the
most practicable treatment for the stormwater outfall. See the pre- and post- runoff summary
on page A-1 of the previously submitted "Stormwater Management Design Study and
Erosion and Sediment Control" notebook prepared by STV/RWA. Given the constraints of
the adjacent soccer field, the existing developed conditions of this part of the project corridor
and the linear nature of the project a forebay for Basin #1 has not been provided.
3. As stated in the DWQ Stormwater BMP Manual for dry extended detention basins (page 17-
2) "A sediment depth indicator must be provided". The Dry Extended Basin Supplement
Sheet also notes that a sediment depth indicated is required. Please include this feature in all
three basins.
A sediment depth indicator will be included in the plan design. See Plan Sheet #2-D
(Attachment B - Exhibit 5), notes 1 & 2.
4. The required Items Checklist notes that a construction sequence that shows how the dry
detention basin will be protected from sediment until the entire drainage area is stabilized is
necessary. The details provided on the plan sheet are not sufficient to ensure protections of
the basin and they do not clearly indicate the appropriate steps to be taken to convert/restore
Ms. Sue Homewood
January 14, 2009
Page 3
the basin following roadway construction. Please provide a more detailed construction
sequence.
A more detailed construction sequence has been added and can be found on Plan Sheet #EC-4
(Attachment B - Exhibit 6). The construction schedule includes direction to the contractor to
regrade the detention basins to their design dimensions after construction. Also, see added
notes on Plan Sheet #2-D which provides instruction to the contractor for maintaining the
basins during construction.
5. Please provide a plant and landscape plan for the dry extended detention basins.
The detention basins will be seeded in accordance with the NCDENR standard seeding
specifications. See Plan Sheet #EC-4 (Attachment B - Exhibit 6). The appropriate seed mix
would be based on the dates the seeding takes place.
6. The construction detail provided for the cross vane within the mitigation area is not
sufficient. The construction detail should clearly specify size of rock, depth of rock,
anchoring of footer rocks into the stream banks, angle of wings on the cross vane, fabric use
behind the vane to prevent piping, depth of pool excavated below the cross vane, etc. The
Division must ensure that the cross vane is designed and installed properly to promote
success of the stream relocation.
A revised Sheet 17 has been attached, which depicts additional details for the proposed
stream cross vane (Attachment B - Exhibit 7). The size of rock, the depth of rock, anchoring
of the footer rocks into the stream banks, the angle of wings on the cross vane, and the
geotextile fabric used behind the vane, and the depth of the pool excavated below the cross
vane is depicted as requested.
Please do not hesitate to contact either of the undersigned at 704-372-1885, if you have any
questions.
Sincerely,
STV/RALPH WHITEHEAD ASSOCIATES, INC.
1'. P
Brandon Phillips, C. M.
Sr. Environmental Specialist
Michae A. a cc , P.W.S.
Senior Scienti
Attachments
cc: Keith Pugh, P.E., City of High Point
Ian McMillan, DWQ
ATTACHMENT A
NCDWQ REQUEST FOR ADDITIONAL INFORMATION
O?O? W AT ?RpG
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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
November 19, 2008
DWQ# 07-1995
Guilford County
CERTIFIED MAIL: 7008 0150 0002 7876 7662
RETURN RECEIPT REQUESTED
Mr. Keith Pugh
City of High Point
PO Box 230
High Point NC 27261
Re: Section 401 Water Quality Certification for the Hartley Drive Widening and Extension
Dear Mr. Pugh:
On October 23, 2008, the North Carolina Division of Water Quality (DWQ) received new information
regarding your application for a 401 Individual Water Quality, to impact 0.349 acres of wetlands and 518 linear
feet of an unnamed tributaries to Rich Fork in Guilford and Davidson Counties in order to construct the Hartley
Drive Widening and Extension. Review of this information indicates that additional information is required in
order that we may determine your project's compliance with 15A NCAC 2H.0500. The DWQ will require this
information in order to process your application to impact protected wetlands and/or streams on the subject
property. Therefore, we will place this project on hold as incomplete until we receive this additional
information, and if we do not receive the additional information requested below, we will have to move toward
denial of your application as required by 15A NCAC 2H.0506. Please provide the following information so
that we may continue to review your project.
1. As stated in the DWQ Stormwater BMP Manual for dry extended detention basins (page 17-2)
"Seasonally high groundwater table must be at least 2 feet below the bottom of the basin". The
Dry Extended Basin Supplement Sheet also notes that the SHWT elevation must be known in
order to complete this checklist. Please provide this information for all three detention basins.
2. As stated in the DWQ Stormwater BMP Manual for dry extended detention basins (page 17-2)
"A forebay is required if the design volume to the facility is over 10 acre-inches". For Basin #1,
the Dry Extended Basin Supplement Sheet also notes that the total runoff volume captured by
the basin indicates that a forebay is required. Please modify the design of Basin #1 to include a
Forebay.
3. As stated in the DWQ Stormwater BMP Manual for dry extended detention basins (page 17-2)
"A sediment depth indicator must be provided". The Dry Extended Basin Supplement Sheet
also notes that a sediment depth indicated is required. Please include this feature in all three
basins. ENGINEERING SERVICES
NO Y 2 T 2M3 NOOft?nhCarob
Natural
North Carolina Division of Water Quality 585 Waughtown Street Phone [phone] Customer Service
Winston-Salem Regional Office Winston-Salem, NC 27107 Fax [phone]
Internet: www.ncwatergaali .org
An Equal Opporhinity/Affirmative Action Employer- 50% Recycled/10% Post Consumer Paper
Attachment A
Mr. Keith Pugh
Hartley Dr. Extension
November 19, 2008
Page 2
4. The Required Items Checklist notes that a construction sequence that shows how the dry
detention basin will be protected from sediment until the entire drainage area is stabilized is
necessary. The details provided on the plan sheet are not sufficient to ensure protection of the
basin and they do not clearly indicate the appropriate steps to be taken to convert/restore the
basin following roadway construction. Please provide a more detailed construction sequence.
5. Please provide a plant and landscape plan for the dry extended detention basins.
6. The construction detail provided for the cross vane within the mitigation area is not sufficient.
The construction detail should clearly specify size of rock, depth of rock, anchoring of footer
rocks into the stream banks, angle of wings on the cross vane, fabric use behind the vane to
prevent piping, depth of pool excavated below the cross vane, etc. The Division must ensure
that the cross vane is designed and installed properly to promote success of the stream
relocation.
Please respond in writing within 30 calendar days of the date of this letter by sending a copy of this information
to Sue Homewood at the address on this letterhead, and a copy to Ian McMillan N. C. Division of Water
Quality, Wetlands/401 Certification Unit, 1650 Mail Service Center, Raleigh, NC 27699-1650. If you will not
be able to provide the requested information within that timeframe, please provide written confirmation that you
intend to provide the requested information, and include a specific timetable delineating when the requested
materials will be provided. If we do not hear from you in 30 calendar days, we will assume that you no longer
want to pursue this project and we will consider the project as returned.
This letter only addresses the application review and does not authorize any impacts to wetlands, waters or
protected buffers. Please be aware that any impacts requested within your application are not authorized (at
this time) by the DWQ. If you have any questions, please contact me at 336-771-4964 or
[e-mail].
S' c?erely,
Sue Homewood
DWQ Winston-Salem Regional Office
cc: Andy Williams, U. S. Army Corps of Engineers, Raleigh Regulatory Field Office
Brandon Phillips, STV/Ralph Whitehead Associates, 100 West Morehead Street, Suite 200, Charlotte,
NC 28208
DWQ Winston-Salem Regional Office
DWQ Wetlands/401 Unit
ATTACHMENT B
EXHIBITS
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STV/Ralph Whitehead Associates BORING LOG
1000 West Morehead Street
Charlotte, North Carolina 28208
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STV/Raiph Whitehead Associates BORING LOG
1000 West Morehead Street
Charlotte, North Carolina 28208
Telephone: [phone]
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PROJECT NO. 3202-000 CITY High Point, NC COUNTY Guilford

ENGINEER J. Skytta
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PROJECT NAME Hartley Drive Extension & Widening GROUND WATER (ft)
BORING NO. B-30 BORING STATION 46+00 OFFSET Oft CL ALIGNMENT -L- 0 HR. NE
COLLAR ELEV. 835.0 ft NORTHING EASTING 24+ HR. NE
TOTAL DEPTH 9.9 ft DRILL MACHINE ATV CME 550X DRILL METHOD 4.25 in. I.D. Hollow Stem Auger HAMMER TYPE Automatic
DATE STARTED 7/25/06 COMPLETED 7125/06 SURFACE WATER DEPTH Not Applicable
ELEV DEPTH BLOW COUNT BLOWS PER FOOT SAMP. V L
. 0 SOIL AND ROCK DESCRIPTION
(ft) (ft) 0.5ft O.Sft 0.5ft 0 20 4D 60 80 100 NO. MO, G
835.0 Ground Surface 835.0 0.0
834.0 1.0 1 03
To soil with rass root mat
1 2 2 3 5 . . . . . . . . . . . ... . . . SS-1 Residuum: Stiff tan brown fine to coarse
3
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sand SILT micaceous moist
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8 . 5 6 13 SS-2 Dense brown white tan silty fine to coarse
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with rock fragments
SAND
829.0 6.0 .
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17 27 31 . . . . . . . . . . . . 58. . . . . . . . SS-3
826.5 8.5 . . . . . . . . . . . . . . . . . .
21 33 50/0.33 . . . . . • . . 5S 4 825.5 9.5
Weathered rock sampled as brown white tan 9.9
silty fine to coarse SAND, with rock fragments,
- oist
Boring Terminated at Elevation 825.1 It
Water not encountered within depth of boring
at termination of drilling and after one day.
Hole cave-in depth measured at a depth of 6.1
feet at termination of drilling.
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