20081659 Ver 1_401 Application_20081108

LETTER OF TRANSMITTAL
Date: 10/31/2008
To: N.C. Dept. of Environment and Natural Resources
Division of Water Quality
1650 Mail Service Center
Raleigh, NC 27699-1650
Attn: Cyndi Karoly
Re: Town of Mocksville Avon Street Sewer Replacement
WE ARE SENDING YOU THE FOLLOWING:
08-1659
GREY ENGINEERING, INC
254 West Water Street
P. O. Box 9
Mocksville, NC 27028
Phone: [phone]
Fax: [phone]
Job: # 102.183
Prints X Attached Submittal
Change order Copy of letter Samples
Under separate cover via X Plans Other
UU2ntlty uescnptlon
5 Pre-Construction Notification (PCN) Application Form 401
5 Project Drawings
5 Applifation Fee
As requested
For your use
X For approval
For review and comment
Resubmit copies for approval
Remarks:
Approved as submitted
Approved as noted
Returned f. corrections
Return corrected prints
Submit copies for distribution
NOV 3 2008
DENR - MATER QUALITY
WETLANDS AND STORMWATER BRANCH
COPY TO:
/ r
SIGNED f
If enclosures are not as noted, please notify us at,6 e.
Office Use Only: Form Version March 08
08-1659
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
Check all of the approval(s) requested for this project:
® Section 404 Permit ? Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
® 401 Water Quality Certification ? Express 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide 12 & Water
Quality Certification 3699
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here: ?
4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ?
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check here: ?
II. Applicant Information p B
r `?:: I \V1 L?
1. Owner/Applicant Information it 0 V :3 2008
Name: Town of Mocksville
Mailing Address: 171 Clement St. _ UENR-WATER
. ivp"s-i+?acST®RM QUAL '?11A' TFR BRAhGH
Mocksville NC 27028
Telephone Number: 336-751-5513 Fax Number: 336-751-7408
E-mail Address:
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Grey Engineering
Company Affiliation: Consulting Civil Engineer
Mailing Address: 254 W. Water St.
Mocksville. NC 27028
Telephone Number: 336-751-2110 Fax Number: 336-751-6348
Page 5 of 13
E-mail Address: jgreygareyen ineering.com
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Town of Mocksville Avon Street Sewer Replacement
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 5738338817
4. Location
County: Davie County Nearest Town: Mocksville
Subdivision name (include phase/lot number): N/A
Directions to site (include road numbers, landmarks, etc.): I-40 West to US Hwy 601 S.
(Valley Rd.) to Ingersoll Rand Property (on west side of Valley Rd.)
5. Site coordinates (Lat/Long or decimal degrees):
PSC #1: Lat 35053'31.34 N & Long 80034'26.82 W
PSC #2: Lat 35°53'33.37 N & Long 80034'24.08 W
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): 1.60 Acres
7. Name of nearest receiving body of water: Bear Creek
8. River Basin: Yadkin River Basin
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at ham://h2o.enr.state.nc.us/admin/maps/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The project site is located on an existing sewer easement on
the Ingersoll Rand (Industrial) property_ The existing site is heavily wooded with the existing
sanitary sewer located in the center of a Bear Creek tributary.
10. Describe the overall project in detail, including the type of equipment to be used:
This project consists of the replacement of approximately _2,100 LF of failing vitrified clay
sanitary sewer pipe with C900 PVC pipe and manholes. Heavy equipment will be used to
complete this project (i.e. Hydraulic Excavators, Loaders, etc).
11. Explain the purpose of the proposed work: Replace the failing s anitary sewer system.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. N/A
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
Page 7 of 13
1. Provide a written description of the proposed impacts:
PSC #1: 30 LF of 72" CMP (Permanent Stream Crossing)
PSC #2: 120 LF of 72" CMP w/ Gabion Baskets (Permanent Stream Crossing)
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
se arately list im acts due to both structure and flooding.
Wetland Impact
Site Number

(indicate on map)
Type of Impact Type of Wetland
(e.g., forested, marsh,

herbaceous, bog, etc.) Located within
100-year
Floodplain

(yes/no) Distance to
Nearest
Stream

linear feet Area of
Impact
(acres)
N/A

Total Wetland Impact (acres)
3. List the total acreage (estimated) of all existing wetlands on the property: N/A
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multiply length X width, then divide by 43,560.

Stream Impact

Number
(indicate on map)

tream Name

Type of

Impact

Perennial or

Intermittent? Average

Stream Width

Before
Impact Impact

Length

(linear
feet)
Area of

Impact
(acres)
PSC #1 Bear Creek Tributary Permanent Perennial 8-ft 120 0.022
PSC #2 Bear Creek Tributary Permanent Perennial 8-ft 30 0.006

Total Stream Impact (by length and acreage) 150 0.028
Page 8 of 13
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact
Site Number
(indicate on ma Name of Waterbody
(if applicable)
Type of Impact Type of Waterbody
(lake, pond, estuary, sound, bay,
ocean, etc.) Area of
Impact
(acres)
N/A

Total Open Water Impact (acres)
6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Impact (acres): 0.028
Wetland Impact (acres): 0
Open Water Impact (acres): 0
Total Impact to Waters of the U.S. (acres) 0.028
Total Stream Impact (linear feet): 150
7. Isolated Waters
Do any isolated waters exist on the property? ? Yes ® No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Current land use in the vicinity of the pond: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
Page 9 of 13
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts. After consultation with a
Geotechnical Engineer, it was determine that a culvert was needed in the stream to stabilize the
existing slope. The culvert length was minimized to the maximum extent possible and gabions
were designed to salvage the integrity of the channel floor.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on January 15, 2002, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may also choose to review the current guidelines for stream restoration in DWQ's
Draft Technical Guide for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwetlands/strmgide.html.
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
N/A
2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
Page 10 of 13
[phone] to determine availability, and written approval from the NCEEP indicating
that they are will to accept payment for the mitigation must be attached to this form. For
additional information regarding the application process for the NCEEP, check the NCEEP
website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please
check the appropriate box on page three and provide the following information:
Amount of stream mitigation requested (linear feet): N/A
Amount of buffer mitigation requested (square feet): N/A
Amount of Riparian wetland mitigation requested (acres): N/A
Amount of Non-riparian wetland mitigation requested (acres): N/A
Amount of Coastal wetland mitigation requested (acres): N/A
IX. Environmental Documentation (required by DWQ)
1. Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) land? Yes ® No ?
2. If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ? No
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify )? Yes ? No
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Page 11 of 13
Zone* Impact
(square feet Multiplier Required
Mitigation
1 N/A 3 (2 for Catawba)
2 1.5
Total
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B .0242 or .0244, or.0260. N/A
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss
stormwater controls proposed in order to protect surface waters and wetlands downstream from
the property. If percent impervious surface exceeds 20%, please provide calculations
demonstrating total proposed impervious level.
Total Drainage Area: 181 acres
Impervious Drainage Area: 35 acres (Rational Method C = 0.90)
Percent Impervious: 19.34% (Roads, Structure Roofs Sidewalks etc.)
Protective Measures:
(1) Gabion Baskets will be used to armor the stream banks
(2) Erosion Control Measure will be in place during construction
(3) Adequate vegetation will be established when construction is complete
XII. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
N/A
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H.0500) or any Buffer Rules?
Yes ? No
Page 12 of 13
Is this an after-the-fact permit application? Yes ? No
XIV. Cumulative Impacts (required by DWQ)
Will this project (based on past and reasonably anticipated future impacts) result in additional
development which could impact nearby downstream water quality? Yes ? No
If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on our website at
http://h2o.erLr.state,.nc.us/'ncwetlands. If no, please provide a short narrative description: This
project will not result in any additional impacts on nearby downstream water quality.
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
Unexpected site conditions were encountered and a geotechnical evaluation was completed. As a
result, a second culvert was required. See attached letter from Scott Hancock, PE of S&ME.
dw?y ?, 2nrf? v;l?
to
Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
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S&ME
Celebrating 35 Years
1973.2008
October 28, 2008
Grey Engineering, Inc.
254 West Water Street
Mocksville, North Carolina 27028
Attention: Mr. John Grey
Subject: Engineering Site Visit
Slope Stability - Between MH-3 and MH-4 at the Creek
Avon Street Sewer Replacement
Mocksville, North Carolina
S&ME Project Number 1581-08-160
Dear Mr. Grey,
Scott Hancock of S&ME met Daniel Lynch of Grey Engineering at the subject site at your
request on October 27, 2008. The purpose of the site visit was to make observations of the
existing excavation slope associated with recent sewer line construction and provide a
professional opinion of appropriate measures to stabilize the slope. Our services specifically
excluded exploration of the existing slope, determination of soil strength parameters, and slope
stability calculations. This letter summarizes our observations and recommendations.
Site Visit Observations
The recently constructed sewer line between MH #3 and MH #4 on the subject project is
bounded on one side by a creek and on the other by an apparent fill slope associated with grading
of the adjacent Ingersoll Rand site. To provide sewer construction access, the creek had been
temporarily piped.
The fill slope was estimated to be approximately 35-feet in height and to have an inclination of
approximately 1.5:1 (Horizontal: Vertical). Vegetation on the fill slope includes trees with trunk
diameters in excess of 18-inches, indicating that the slope has been in place for some time.
Numerous mature trees on the slope with diameters in excess of 18-inches have curved trunks
indicating adjustments of the tree during its life to accommodate downward creep movement of
the slope.
The lower portion of the fill slope was locally cut near vertical to typical heights of 6 to 8 feet,
and occasionally higher, to accommodate recent construction of the sewer line. The exposed
soils were predominantly non-plastic sandy silt soils. Raveling and tension cracks were visible
in the face of the recent excavations. S&ME was requested to make observations of the existing
excavation slope associated with recent sewer line construction and provide a professional
opinion of appropriate measures to stabilize the slope.
S&ME, INC. / 3718 Old Battleground Road / Greensboro, NC 27410 / p 336.288.7180 f 336.288.8980 / www.smeinc.com
Engineering Site Visit October 28, 2008
Avon Street Sewer Replacement SWE Project Number 1581-08-
160
Comments and Professional Opinions
We have developed our recommendations based on conditions observed and our experience,
with the intent of restoring the slope to a state of stability at least equal to that which existed
prior to the recent sewer construction. Our services specifically excluded exploration of the
existing slope, determination of soil strength parameters, and slope stability calculations. Repair
of the original unstable slope to standards commonly associated with new construction would
require reconstruction of the entire existing fill slope, and would be a substantial "betterment" as
compared to the condition that existed prior to the recent sewer construction. Consistent with the
above limitations, we offer the following comments and professional opinions:
1. Curved tree trunks observed indicate the original slope prior to recent sewer construction
was not stable. Therefore, reconstructing the slopes to the original grades is not an
acceptable resolution.
2. At some locations, it appears that the original toe of slope was.effectively at the edge of
the creek. Therefore, there is not sufficient room to construct a soil slope at a flatter,
more stable, inclination.
3. In theory, stronger materials (rock) may be considered to construct a slope buttress at the
original 1.5:1 slope. In practice, the likelihood is that the original slope may fail during
construction of the rock toe buttress.
4. Based on the conditions observed and our experience, we suggest construction of an earth
buttress to stabilize the disturbed portions of the slope. The earth buttress is intended to
restore the slope to the level of stability that existed prior to the recent construction.
After construction of the earth buttress, the stability of the upper portion of the original
fill slope would be similar to what it was prior to sewer construction.
5. The earth buttress would consist of a compacted soil toe of slope with a 2:1 (horizontal:
vertical) inclination extending to the height of disturbed original slope. Soil (minimum
standard Proctor maximum dry density of 90 pcf) should be compacted to a minimum of
95% of the standard Proctor maximum dry density. Compaction in thin lifts without
vibration may be required to maintain stability of the original slope.
6. Large trees in the original slope within 10-feet of areas disturbed by recent sewer
construction should be cut down and the stumps left in place to pro-actively eliminate
potential for the trees to blow over and destabilize the slope.
7. Given the space constraints imposed by the existing creek, it may be necessary to
permanently pipe a portion of the creek.
We appreciate the opportunity to have assisted you with this project. If you have any questions
or we may be of any further service, place call.
Sincerely,
S&ME, Inc.
etl6f?oleer, P.E.
Engineering Department Manager
Scott Hancock; P.E.
Technical Principal