20100862 Ver 1_More Info Received_20101210

Strickland, Bev
From: Homewood, Sue
Sent: Friday, December 10, 2010 9:28 AM
To: Dennison, Laurie; Strickland, Bev
Subject: FW: Stony Creek 7Q10 flow, Burlington
Attachments: PCN Form Burlington Stony+Cammack-2.doc; Burlington Dams PCN-3 Figs 5+15.pdf
Whenever you have time, this goes in file 10-0862. Thanks.
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Gerald Pottern [mailto:[e-mail]]
Sent: Thursday, December 09, 2010 5:20 PM
To: Tarver, Fred; [e-mail]; Homewood, Sue; Bryant, Shari L.
Cc: McEvoy, Steve; Alex Rutledge; Robert Indri; Mark Landis
Subject: Re: Stony Creek 7Q10 flow, Burlington
Thanks Fred. Here's the revised PCN text (most pages have revisions, highlighted in yellow) in a DOC file and the four
new figures in a PDF file. >>> Andy & Sue: I found an error at the top of PCN page 8 and fixed it. The waterbody type
for Open Water impact 02 was incorrectly listed as "Tailrace" in the version I sent you on Dec 7. In this attached version
it is correctly labelled as "Lake".
Gerald
Gerald B. Pottern
Robert J. Goldstein & Associates, Inc.
RJG&A Environmental Consultants
1221 Corporation Parkway, Suite 100
Raleigh, NC 27610 Tel: [phone]
[e-mail]
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----- Original Message -----
From: Tarver, Fred
To: Gerald Pottern ; [e-mail] ; Homewood. Sue; Bryant. Shari L.
Cc: McEvoy, Steve
Sent: Thursday, December 09, 2010 4:45 PM
Subject: RE: Stony Creek 7Q10 flow, Burlington
Gerald.
I think the flows during dam repairs that you propose, i.e. 0.8 cfs at Lake Cammack Dam and 2.0 cfs at Old Stony Creek
Dam, are reasonable. As for the determination of what flows may be needed after construction, DW R would rely upon the
process outline in the Dam Safety rules in consultation with the Division of Land Resources.
Fred
P.S. If it's not too much trouble, please simply send me the pages and/or figures from the PCN that have been updated
from the original. Thanks.
From: Gerald Pottern [mailto:[e-mail]]
Sent: Wednesday, December 08, 2010 2:13 PM
To: Tarver, Fred; Bryant, Shari L.
Cc: Alex Rutledge; Robert Indri; Mark Landis
Subject: Re: Stony Creek 7Q10 flow, Burlington
Hi Fred & Shari - I resubmitted the Burlington Dams PCN to ACE and DWQ on Dec 7. Since I hadn't heard
back from you yet regarding Lake Cammack minimum release, I made a tentative assumption of 0.8 cfs (360
gal/min) based on the Giese & Mason 7Q10 and 7Q2 data summarized in my previous email (below). Let me
know if you've got other ideas for an appropriate minimum flow.
Here's the revised text from the PCN, section D. lb. "Measures to Avoid and Minimize Impacts":
" The minimum release bypass pipe at Old Stony Creek Dam, which passes about 2 cfs, will remain in operation during
and after construction. The upper release gate at Lake Cammack will be used to release approximately 0.8 cfs during
construction (rate to be determined by DWR based on 7Q10). This gate draws epilimnetic water which should have
adequate dissolved oxygen."
Also, let me know if you'd like me to email you the revised PCN and figures.
Sincerely,
Gerald Pottern
----- Original Message -----
From: Gerald Pottern
To: Tarver, Fred ; Shari Bryant
Cc: Alex Rutledge ; Robert Indri ; Mark Landis
Sent: Thursday, December 02, 2010 4:04 PM
Subject: Stony Creek 7Q10 flow, Burlington
Hi Fred & Shari - Here's what I gleaned from the USGS Giese & Mason 1991 report regarding low flow in
Stony Creek:
Stony Creek is in the northern Carolina Slate Belt, designated Hydrologic Area HA-7. Giese & Mason does
not have a low flow regression equation for HA-7, but the range of 7Q10 low flows based on 58 sites in HA-7
are:
Min (1 %) 7Q10 in HA-7 =.000 cfs/mi2
25 percentile 7Q10 in HA-7 =.000 cfs/mi2
50 percentile 7Q10 in HA-7 =.005 cfs/mi2
75 percentile 7Q 10 in HA-7 = .015 cfs/mi2
Max (99 %) 7Q10 in HA-7 = .131 cfs/mi2
Cammack Dam = 47 mi2 x .000= 0.0 cfs
Cammack Dam = 47 mi2 x ..000 = 0.0 cfs
Cammack Dam = 47 mi2 x .005 = 0.23 cfs
Cammack Dam = 47 mi2 x..015 = 0.70 cfs
Cammack Dam = 47 mi2 x .131 = 6.1 cfs
Four of the 58 sites in HA-7 are in the Stony Creek watershed (Stony Cr, Jordan Cr and Buttermilk Cr). The
7Q10 estimate for all four sites is zero, which isn't too useful for assigning a non-zero flow target, so I also
considered the 7Q2 estimates which are: 0.025, 0.007, 0.004, and 0.004 cfs/mi2.
The highest of these 7Q2 flow estimates is from site #101 on upper Stony Creek (23.9 mi2, 7Q2 = 0.6 cfs).
Applying this rate at Cammack Dam: 47 mi2 x 0.025 cfs/mi2 = 1.2 cfs.7Q2 flow
Based on these 7Q10 and 7Q2 estimates from USGS, a reasonable minimum flow to meet 7Q10 should
probably be somewhere between 0.23 cfs (using 50 percentile of all sites in HA-7) and 1.2 cfs (using 7Q2 for
upper Stony Cr).
Gerald
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Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.3 Dec 10 2008
Pre-Construction Notification (PCN) Form
A. Applicant Information
1. Processing
1 a. Type(s) of approval sought from the
Corps: ® Section 404 Permit ? Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: NWP-3 or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps? FZyes: Andy Williams ? No
1 d. Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification - Regular ? Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ® Riparian Buffer Authorization
1 e. Is this notification solely for the record
because written approval is not required? For the record only for DWQ 401
Certification:
? Yes ® No For the record only for Corps Permit:

? Yes ® No
1f. Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program. ? Yes ® No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below. ? Yes ® No
1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No
2. Project Information
2a. Name of project: Burlington Old Stony Creek Dam and Lake Cammack Dam Rehabilitation
2b. County: Alamance
2c. Nearest municipality / town: Burlington, Glencoe
2d. Subdivision name: NA
2e. NCDOT only, T.I.P. or state
project no:
NA
3. Owner Information
3a. Name(s) on Recorded Deed: "Burlington Water Works" (City of Burlington Water Resources Dept)
3b. Deed Book and Page No. Old Stony Res: Deed Book 89, pg.472; Lake Cammack: Deed Book 11, pg.8
3c. Responsible Party (for LLC if
applicable): Robert Patterson Jr., P.E., Water Resources Director
3d. Street address: 1302 Belmont Street
3e. City, state, zip: Burlington, NC 27216
3f. Telephone no.: [phone]
3g. Fax no.: [phone]
3h. Email address: [e-mail]
Page 1 of 13
PCN Form - Version 1.3 December 10, 2008 Version
4. Applicant Information (if different from owner)
4a. Applicant is: Owner ? Agent ? Other, specify:
4b. Name: City of Burlington
4c. Business name
(if applicable): see Owner Information
4d. Street address: see Owner Information
4e. City, state, zip: see Owner Information
4f. Telephone no.: see Owner Information
4g. Fax no.: see Owner Information
4h. Email address:
see Owner Information
5. AgenttConsultant Information (if applicable)
5a. Name: Gerald Pottern
5b. Business name
(if applicable): Robert J Goldstein & Associates, Inc.
5c. Street address: 1221 Corporation Pkwy, suite 100
5d. City, state, zip: Raleigh, NC 27610
5e. Telephone no.: 919-872-1174
5f. Fax no.: 919-872-9214
5g. Email address: [e-mail]
Page 2 of 13
PCN Form - Version 1.3 December 10, 2008 Version
B. Project Information and Prior Project History
1. Property Identification ,
1a. Property identification no. (tax PIN or parcel ID):
Old Stony = PIN# 8886-37-9487;
Cammack = No PIN# on tax map
1 b. Site coordinates (in decimal degrees):
Old Stony Creek Dam: Lat: 36.1280 Long: - 79.4061
Lake Cammack Dam: Lat: 36.1773 Long: - 79.4117
1c. Property size: Old Stony Cr Res = 150+ ac, Lake Cammack = 760+ ac.
(Areas not specified in Alamance Co GIS tax maps).
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to proposed Stony Creek, Old Stony Creek Reservoir (= Burlington
project: City Lake, and Lake Cammack (= Lake Burlington)
Lake Cammack = WS-III-NSW, Old Stony Cr Res = WS-
2b. Water Quality Classification of nearest receiving water: III-CA-NSW, Stony Creek below Old Stony Cr Dam =
WS-V-NSW
2c. River basin:
Cape Fear River / Jordan Lake 03-06-02
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
Burlington owns two water supply dams in series on Stony Creek, 3.4 miles apart, with a raw water intake on the downstream
dam (Old Stony Cr Reservoir, built in 1920s). The larger upstream reservoir (Lake Cammack, built in 1961) provides storage and
flow regulation for the lower lake. The adjacent land surrounding both lakes is mostly forested except for mowed areas near the
dams. Old Stony Cr Reservoir has a boat ramp, dock, picnic area, and water intake pump building near the right (southwest) dam
abutment. An electrical sub-station and a few homes are located along Faulkner Drive just south of the fenced area containing the
park facilities and pump building. Lake Cammack has no public access or park facilities near the dam, and the closest residences
are more than 400 feet from the dam.
3b. List the total estimated acreage of all existing wetlands on the property:
Lake Cammack is approximately 757 acres of open water at normal pool elevation (575.7 ft), and Old Stony Cr Res is
approximately 120 acres of open water at normal pool elevation (534.5 ft). A discontinuous linear fringe of wetland herbs and
shrubs occurs along the shoreline in some areas, mostly within the normal lake pool (open waters). Lake Cammack has small
patches of wetland extending above normal pool near the dam abutments, including 620 sq.ft.of marsh near the right abutment
(see Figure 15B). The upper portions of these lakes may have more wetlands along their perimeters, but RJG&A's survey for
shoreline wetlands did not extend more than 500 feet beyond each dam, as no project disturbance will occur beyond the surveyed
areas. There are no adjacent wetlands along Stony Creek within 300 feet downstream of either dam, based on RJG&A's survey.
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
Stony Creek extends about 700 feet below Old Stony Creek Dam to the southern limit of the reservoir property. The adjacent
property east of Old Stony Creek Dam, where the left abutment access road and staging area are planned, contains a small
perennial stream south of the staging area and a farm pond at the head of an ephemeral channel north of the staging area. Stony
Creek below Lake Cammack dam extends 1200 feet downstream to the reservoir property line at Stony Creek Church Road.
Other tributaries on the reservoir properties will not be affected and were not examined or mapped for this project.
Page 3 of 13
PCN Form - Version 1.3 December 10, 2008 Version
3d. Explain the purpose of the proposed project:
Lake Cammack and Old Stony Creek dams have structural and operational problems, and both are are potentially unstable at their
respective design storm flows. Lake Cammack Dam has Alkali-Silica Reactivity (ASR) deterioration, seepage accumulation
behind the spillway training walls, and its earthen abutments are lower than the dam's concrete non-overflow sections. Old Stony
Creek Dam has a clogged and corroded low-level drainpipe, weak anchoring to bedrock, and short abutments that could fail
during major flood flows. Past flood flows at Old Stony Creek Dam have caused downstream erosion along the steep left bank
that needs stabilization. The proposed repair work designed by Schnabel Engineering of Greensboro will improve dam safety and
reliability in accordance with NC Dam Safety Program guidance. The proposed rehabilitation work will improve spillway
strength, bedrock anchoring, and dam abutment integrity at both dams; improve training wall drainage at Cammack Dam; replace
the low-level drain at Old Stony Cr Dam; and mitigate ongoing stream-bank erosion below Old Stony Cr Dam. This work will
not change the footprint of either dam within waters, nor any change in the normal pool elevation, usage, water storage or
withdrawal capacity at either lake.
These dam repair projects are inter-dependent and treated here as a single project because the water supply intake at Old Stony
Creek Reservoir requires flow mangement from Lake Cammack to operate at normal water demand rates. Lake Cammack has
eight times the volume of Old Stony Creek Reservoir, and failure of Lake Cammack Dam would drastically reduce the water
supply yield in Old Stony Creek Reservoir to a small fraction of the 16 MGD treatment capacity at the City's Ed Thomas WTP.
The repair work on these dams will be implemented either concurrently or in succession during the first half of 2011.
3e. Describe the overall project in detail, including the type of equipment to be used:
A brief summary of the proposed dam repairs is provided below, and further descriptions of construction methods and impacts are
provided in the Supplementary Text at the end of Section B.
>> Repairs at Old Stony Creek Dam include: 1) replace the clogged low-level outlet with a new riser and drain pipe installed
through the existing low-level drain pipe; 2) install post-tensioned anchors drilled vertically through the spillway crest and
abutments into bedrock; 3) extend the right dam abutment 180 feet landward by drilling and constructing a secant pile wall; 4)
extend the left dam abutment 90 feet landward, either by drilling to construct a secant pile wall or by excavating to construct a
concrete gravity abutment extension; and 5) install a concrete toe wall and riprap armoring along the eroding left bank of Stony
Creek below the dam, above OHWM. The dam repairs will require a lake drawdown of three feet for about one month during
construction. (Cofferdam mentioned in the Oct 18 PCN will not be needed). The raw water intake will not be modified.
>> Repairs at Lake Cammack Dam include: 1) install post-tensioned anchors drilled vertically through the dam crest into
bedrock; 2) remove existing trees, riprap and topsoil on both dam abutments, then add fill to raise each earth abutment level with
top of dam (approx two feet); 3) replace riprap on abutment slopes and replace topsoil and grass on abutment crests; 4) excavate
behind each training wall below the dam to install a waterproofing barrier and drainage system for seepage; 5) backfill to original
grade behind each training wall, install piezometers and re-establish grass. The dam repairs will require a lake drawdown of three
feet for about one month during construction. (Cofferdams mentioned in the Oct 18 PCN will not be needed).
>> Work performed in the lakes (low-level drain repair and drilling for the spillway anchors) will be done from a barge launched
from existing boat ramps or by crane. A temporary rock or concrete crane pad will be constructed near the shoreline at Lake
Cammack. The Old Stony Dam drain repair work requires vacuum dredging of sediment from around and inside the old clogged
pipe. Sediment from the lakebed (dredged from the barge) will be sidecast on the adjacent lakebed, and sediment from the
tailrace will be landfilled off-site. Raising the right dam abutment at Lake Cammack will require temporary fill in a lakeshore
fringe wetland ? for vehicle access. Permanent fill for the dam abutment improvements (both dams), training wall repairs
(Cammack), and stream-bank erosion control (Old Stony) will be on uplands beyond the lake shoreline and stream-banks.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the Corps or
State been requested or obtained for this property / project
i
l
i
®Yes El No ? Unknown
(
nc
ud
ng all prior phases) in the past?
Comments: Andy Williams verified PJG&A delineation on 30 Nov 2010
4b. If the Corps made the jurisdictional determination, what type of ® Preliminary ? Final
determination was made.
4c. If yes, who delineated the jurisdictional areas? Agency/Consultant Company:
Name (if known): Gerald Pottern, RJG&A Robert J. Goldstein & Associates Inc.
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5. Project History
5a. Have permits or certifications been requested or obtained for this ? Yes ® No ? Unknown
project (including all prior phases) in the past?
Page 4 of 13
PCN Form - Version 1.3 December 10, 2008 Version
5b. If yes, explain in detail according to "help file" instructions. None
6. Future Project Plans
6a. Is this a phased project? ? Yes ® No
6b. If yes, explain.
Project Description, Supplementary Response to Item 3e:
Old Stony Creek Dam Repairs:
1) Low-Level Drain Outlet: Replace the existing 48-inch low-level drain pipe and gate, which is corroded and clogged with
sediment, with a new 36-inch pipe (sleeved inside the existing pipe), riser and gate. Accumulated sediment that hasburied the inlet of
the old drain pipe on the upstream dam face will be vacuum-dredged using a barge, which will be launched at the existing boat ramp
near the southwest corner of the lake. Approximately 32 cu.yds. of sediment will be vacuumed from 250 sq.ft. of lake bed around the
pipe inlet, and will be sidecast onto 2500 square feet of adjacent lakebed (about 4 in deep). The new riser inlet invert will be 8 feet
above the horizontal drainpipe centerline, so that it will remain about 4 feet above the lakebed after the sidecast sediment gradually
slumps back down into the dredged area. Sediment in the tailrace around the drain pipe outlet and inside the pipe was removed in
November 2010 using a vacuum-dredge on a truck, operated from the tailrace shoreline at the foot of the dam. Approximately 18
cu.yds. of sediment was removed and disposed of on City-owned upland property on Anthony Rd in Burlington (Alamance County
GPIN 8863029761). Three concrete blocks approximately 5 x 3 x 3 feet were temporarily placed in the tailrace 15 feet below the
drainpipe outlet to contain the sand and gravel flushed from inside the pipe with high-pressure water jetting. The tailrace dredging
area includin- the blocks (temporary fill) was approximately 200 sq.ft or less. Half of the sediment came from inside the 48-inch
pipe, and half came from the tailrace bed below the pipe outlet. A temporary silt curtain was placed across the tailrace 50 feet below
the drainpipe outlet to minimize downstream turbidity, and will remain in place until the drain repair work is complete.
With the old drain pipe inlet blocked, the new 36-inch drain pipe will be installed through the old pipe from the downstream side, and
the space between the old and new pipes will be grouted. The outlet of the new drain pipe will be capped off while the new 36-inch
riser and gate are installed at the pipe inlet in the lake. The rehabilitated low-level drain will be operated by City personnel to regulate
the pool level during spillway and abutment repair, and if needed for any future emergency drawdowns. It is not intended for routine
reservoir releases, and its inlet height (4 feet above lakebed) will preclude releasing sediment from the lake. The low-level drain outlet
repair work will be completed prior to the other dam remediation work described below. The Old Stony Creek Reservoir water intake
will not be operated during the low-level drain repair (including sediment dredging) and for at least 48 hours thereafter to prevent
disturbed sediment from affecting raw water quality at the WTP. During this time Burlington will rely on its Lake Maclntosh water
supply intake and water treatment plant.
2) Spillway Anchoring: Anchor the existing spillway and abutments into underlying bedrock with a series of 39 steel strand anchors
installed by drilling vertically through the existing dam crest. The drilling rig will be mounted on a barge in the lake, and drilling
debris will be captured and removed using a collar and containment device around the drill. The barge for installing the anchors and
dredging sediment around the low-level drain inlet will be launched at the existing boat ramp near the right dam abutment. The
construction staging area will be on uplands south of the water intake pump station and outside the riparian buffer. The reservoir level
will be drawn down three feet below normal full pool for about one month during the anchor installation and abutment repair work.
3) Extend Right Abutment with Secant Pile Wall: Extend the right dam abutment approximately 180 feet landward (south) by
constructing a secant pile wall. This wall is constructed by drilling a staggered series of overlapping 4-foot diameter shafts down to
bedrock and filling them with concrete and reinforcing steel bars. The existing concrete block emergency spillway in this area will
remain as is. The secant pile wall top will be level with the existing grade. Construction of the secant pile wall will be entirely in
uplands, with no direct impact to waters. The construction staging area will be on uplands just south of the water intake pump station
and outside the riparian buffer. (Cofferdams mentioned in the Oct 18 PCN will NOT be needed).
Page 5 of 13
PCN Form - Version 1.3 December 10, 2008 Version
4) Extend Left Abutment with Concrete Gravity Section or Secant Pile Wall: Extend the left dam abutment approximately 90
feet landward (north) by constructing either a secant pile wall similar to the right abutment or a concrete gravity extension, to be
selected by the contractor. If the concrete gravity option is installed the work sequence will consist of the following: Excavate a trench
down to bedrock immediately north of the existing short concrete left abutment, and construct a 90-foot long concrete gravity
overflow abutment extension, 16 feet wide at the base and 4 feet wide at the crest. The new abutment crest will match the existing
grade, and is designed to overflow during flood events onto the proposed rock-armoring along the left bank of Stony Creek (see
below). The construction staging area for this work and item 5 below will be in an upland field (abandoned pasture) along a gravel
road east of the lake (access from Deep Creek Church Rd). No wetland, stream, or riparian buffer will be affected by the off-site
access road and staging area. Normal pool level will be restored after the spillway anchoring and abutment extensions are complete.
5) Stabilize Eroding Left Bank of Stony Creek: Construct a concrete toe wall anchored to the existing exposed rock along the left
bank of Stony Creek, beginning at the spillway and extending approximately 75 feet downstream. Steel anchors in the wall will be
drilled into the rock. The base of the proposed toe wall is about 8 to 10 feet in elevation above the OHWM of Stony Creek, and 25 to
35 feet laterally from the creek. Upslope of the toe wall, an area of approximately 2300 square feet (mostly forested) will be cleared,
graded to a 2:1 slope, and stabilized with riprap underlain with geotextile filter material and gravel bedding. Trees along the steep
bank just above the proposed toe wall are being undercut during major storms, and many have already fallen. A slope of 1.5`.1 was
considered for reducing forested buffer impact, but would require a larger toe wall to support it, and was determined not feasible.
6) Erosion and Sedimentation Control: The Contractor will install, maintain and adjust erosion and sedimentation control devices
throughout all phases of construction as needed to comply with a DENR-approved Erosion and Sedimentation Control Plan.
Lake Cammack Dam Repairs:
1) Spillway Anchoring: Anchor the existing concrete spillway into underlying bedrock with a series of 20 steel strand anchors
installed by drilling vertically through the existing dam crest. The drilling rig will be mounted on a barge in the lake, and drilling
debris will be captured and removed using a collar and containment device around the drill. The barge for drilling the spillway anchors
will be loaded by crane from a temporary crane pad (rock or concrete) to be constructed in the staging area (existing upland grassed
areas) near the right dam abutment. Temporary earth fill will be placed in the 620 sq.ft lake fringe marsh wetland along the base of the
right abutment riprap, just south of the crane pad area, to allow vehicle access for the abutment repair work. The reservoir level will
be drawn down three feet below normal full pool for about one month during the spillway work. (There will NOT be a temporary
ramp into the lake for barge launching, as described in the previous PCN dated Oct 18).
2) Raise Right and Left Abutments to Design Elevation: Remove and stockpile the existing riprap and topsoil on both dam
abutments. The area to be excavated extends 300 feet landward from Lake Cammack on the right abutment and 400 feet landward
from the lake on the left abutment. The left abutment also includes a row of large loblolly pines that must be removed. About five of
these trees are within the lake's riparian buffer, but NC Dam Safety Program requires that all large trees on dams be removed to
protect against dam failure. Each abutment will then be raised (up to two feet in some areas) using earth fill from on-site borrow areas
(existing upland grassed areas) to match the dam design elevation of 590.7 feet. Riprap will then be replaced on the abutment slopes,
and topsoil and grass re-established on the abutment crests. The temporary earth fill placed in the Lakeshore marsh wetland along the
base of the right abutment riprap will be removed and pre-construction topography in the wetland restored. No planting will be
needed, as the adjacent shoreline vegetation is expected to quickly recolonize this area (Andy Williams, pers.comm).
3) Training Wall Seepage Drainage: Excavate the soil behind the right and left training walls on the downstream face of Lake
Cammack dam, and stockpile the soil it in the corresponding upland staging area. On the back side of each training wall, install a
waterproofing membrane, drainage board over the membrane, drainage piping, and drainfill material. The drainage piping will
discharge into Stony Creek through 4-inch drain holes drilled at the base of each wall. Then backfill the stockpiled soil, install three
piezometers behind each training wall to monitor the effectiveness of the drainage system, and re-establish grass cover. (Cofferdams
mentioned in the Oct 18 PCN will NOT be needed).
Page 6 of 13
PCN Form - Version 1.3 December 10, 2008 Version
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
® Wetlands ? Streams - tributaries ® Buffers
® Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact
Permanent (P) or (if known) DWQ - non-404, (acres)
Temporary T other
W1 ? P ®T Temp fill for Lake Cammack ? Yes ® Corps

see figure 15A-B
construction access
fringe marsh
®No ?
DWQ 0.0142
W2 ? P ? T NA NA ? Yes ? Corps NA
? No ? DWQ
W3 ? P ? T NA NA
s
11
? Corps
NA
Ne
? ? DWQ
2g. Total wetland impacts 0.0142
2h. Comments: Temporary fill will be removed after abutment repair and pre-construction topography restored. No planting will be
needed, as the adjacent shoreline vegetation is expected to quickly recolonize this area (Andy Williams, pers.comm).
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact Type of impact Stream name Perennial (PER) Type of Average Impact
number - or intermittent jurisdiction stream length
Permanent (P) or (INT)? (Corps - 404, 10 width (linear
Temporary (T) DWQ - non-404, (feet) feet)
other)
s1 ? P ? T ? PER ? Corps
NA NA
? INT
? DWQ NA NA
S2 ? P ? T NA NA ? PER ? Corps
? INT ? DWQ NA NA
S3 ? P ? T NA NA ? NTR DWQ NA NA
E]
3h. Total stream and tributary impacts
3i. Comments:
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of the
U.S. then individually list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number - (if applicable) Type of impact Waterbody type Area of impact
Permanent (P) or (acres)
Temporary T
Page 7 of 13
PCN Form - Version 1.3 December 10, 2008 Version
01 MP F-1 T Old Stony Creek Dredge` sediment from low-level drain pipe Lake 0.00574 acre
see figure 5D Reservoir inlet area in lake, upstream dam face
02 ®P ? T Old Stony Creek Re-deposit dredged sediment on lakebed Lake 0
0574 acre
see figure 5D Reservoir adjacent to dredged area .
03 ? P ? T Old Stony Creek Dam Place temporary blocks and dredge Dam Tailrace 0
00459 acre
see figure 5D Tailrace sediment from drain pipe outlet area .
4f. Total open water impacts 0.0677 acre
4g. Comments: O 1: Average excavation depth in lake = 41 inches (32 cu.yd in 250 sq.ft). 02: Average re-deposition depth in lake = 4
inches (32 cu.yd in 2500 sq.ft). Over time the redeposited sediment will probably settle back into the depression around the new riser where
it was excavated, due to lake currents and storms. Because this deepest portion of the lakebed is probably anaerobic for much of the
summer, the excavation and redeposition of sediment will have negligible effect on benthic organisms in the lake. 03: Average excavation
depth in tailrace = 16 inches.
5. Pond or Lake Construction
If and or lake construction proposed, then com lete the chart below.
5a. 5b. 5c. 5d. 5e.
Wetland Impacts (acres) Stream Impacts (feet) Upland
Pond ID Proposed use or purpose of (acres)
number pond
Flooded Filled Excavated Flooded Filled Excav Flooded
ated
P1 NA 0 0 0 0 0 0 0
P2 NA 0 0 0 0 0 0 0
5L Total 0 0 0 0 0 0 0
5g. Comments: Proposed repairs to two existing public water supply dams; no new dam construction. No change in lake pool areas.
5h. Is a dam high hazard permit required? ? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWO)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a. Neuse Tar-Pamlico
? ? ®Other: Jordan Lake
Project is in which protected basin? Jordan Lake ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number - Reason for impact Stream name or Buffer mitigation Zone 1 impact Zone 2 impact
Permanent (P) or Lake name required? (square feet) (square feet)
Temporary T
131 ? P ®T Right abutment
Old Stony Creek
? Yes

see figure 6 extension, secant pile
Reservoir
No 360 sf, gras/rock 700 sf, gras/rock
wall construction

B2 ? P ®T Left abutment extension,
Old Stony Creek
? Yes
900 sf, forest
400 sf
forest
see figure 7 concrete gravity or
secant pile wall Reservoir ® No ,

B3 ®P ? T Left abutment extension,
Old Stony Creek
? Yes
350 sf, forest
550 sf
forest

see figure 7 concrete gravity or
secant pile wall
Reservoir
®No ,
64 ®P ? T Left abutment extension, Stony Creek below ? Yes 650 sf, forest, 1910 sf, forest,

see figure 8
toe wall and riprap
Old Stony Cr Dam
® No 540 sf, bedrock
300 sf, bedrock
Page 8 of 13
PCN Form - Version 1.3 December 10, 2008 Version
B5 ? P ®T Left abutment extension, Stony Creek below ? Yes
2000 sf
bedrock 460 sf, forest,
see figure 8 toe wall and riprap Old Stony Cr Dam ® No , 150 sf, bedrock
B6 ? P ®T
see figure 15A Right abutment staging
and crane pad area Lake Cammack ? Yes
® No 2250 sf, grass 1500 sf, grass
B7 ? P ®T
see figure 17 Right abutment to be
raised
Lake Cammack El Yes
® No
2200 sf, gras/rock
1300 sf, gras/rock
B8 ? P ® T Left abutment to be
Lake Cammack ? Yes 1900 sf, gras/rock, 1250 sf, gras/rock,
see figure 18 raised ® No a few trees a few trees

B9 ? P ®T Right training wall

excavation for drainage
Stony Creek below
? Yes
350 sf, forest
750 sf, forest
see figure 20
installation Cammack Dam
®No
2200 sf, gras/rock
1150 sf, gras/rock
B10 ? P ®T Left training wall

excavation for drainage
Stony Creek below
? Yes
200 sf, forest
150 sf, forest
see figure 21
installation Cammack Dam ® No 2150 sf, gras/rock 1450 sf, gras/rock

6h. Total buffer impacts 2,450 sf, forest 4,220 sf, forest
13,600 sf, gras/rock 7,800 sf, gras/rock
6i. Comments: Buffer areas that are currently covered in grass or riprap will be restored to their pre-construction condition. The only
permanent buffer change will be the left abutment and toe waWriprap stabilization areas (133, B4) where 1300 sq.ft of forest in Zone 1 and
2460 sq.ft of forest in Zone 2 will be converted to grass, riprap and concrete.
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1 a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
Construction access to both dams will use existing roads and trails on opposite sides of the dam, thus avoiding the need to construct a
temporary vehicle crossing across Stony Creek. No stream, wetland or buffer impacts are located along these access roads. The areas to be
used for construction staging and borrow areas for embankments are in grassed uplands, away from riparian buffers, except for a grassed
area along the right shoreline of Lake Cammack where the crane platform will be constructed (for barge loading). A small lakeshore fringe
wetland (non-forested) between the crane pad area and riprap abutment slope is unavoidable, and will be temporarily filled for equipment
access and then restored.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Drilling for the spillway anchors will be conducted from a barge, minimizing disturbance to the stream and lake bed, and spillway drilling
tailings will be collected and disposed of on uplands. In-stream sediment control measures will be used in the Old Stony Creek dam tailrace
to prevent excessive sediment release during dredging for the low-level drain replacement. The minimum release bypass pipe at Old Stony
Creek Darn, which passes about 2 cfs, will remain in operation during and after construction. The upper release gate at Lake Cammack will
be used to release approximately 0,8 cfs during construction (rate to be determined by DWR based on 7Q10). This gate draws epilimnetic
water which should have adequate dissolved oxygen. Lake drawdown for spillway anchoring at Lake Cammack will be done prior to April 1
to avoid stranding bass and sunfish nests.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for impacts ? Yes ® No
to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ? DWQ ? Corps
? Mitigation bank
2c. If yes, which mitigation option will be used for this project? ? Payment to in-lieu fee program
? Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank: NA
Page 9 of 13
PCN Form - Version 1.3 December 10, 2008 Version
3b. Credits Purchased (attach receipt and letter) ?ype NA Quantity NA
3c. Comments: NA
4. Complete if Making a Payment to In-lieu Fee Program
4a. Approval letter from in-lieu fee program is attached. ? Yes
4b. Stream mitigation requested: A linear feet
4c. If using stream mitigation, stream temperature: ? warm ? cool ?cold
4d. Buffer mitigation requested (DWQ only): A square feet
e. Riparian wetland mitigation requested: A acres
4f. Non-riparian wetland mitigation requested: A acres
4g. Coastal (tidal) wetland mitigation requested: A acres
4h. Comments:
Complete if Using a Permittee Responsible Mitigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan. NA
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation? ? Yes ® No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.

Zone c.
Reason for impact d.
Total impact
(square feet)
Multiplier 6e.
Required mitigation
(square feet)
Zone 1 NA 3 (2 for Catawba)
Zone 2 NA 1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in-lieu fee fund).
6h. Comments:
Page 10 of 13
PCN Form - Version 1.3 December 10, 2008 Version
E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1 a. Does the project include or is it adjacent to protected riparian buffers identified within ® Yes ? No
one of the NC Riparian Buffer Protection Rules?
1 b. If yes, then is a diffuse flow plan included? If no, explain why.
Comments: The proposed new impervious areas (abutment extensions and toe wall) are part ? Yes ® No
of the dams and are therefore contiguous with the two lakes and Stony Creek.
2. Stormwater Management Plan
2a. What is the overall percent imperviousness of this project? NA %
2b. Does this project require a Stormwater Management Plan? ? Yes ® No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why: This project comprises repairs and safety
upgrades to two existing water supply dams. The impervious areas to be added (dam abutments and toe wall) are negligible in size and
located immediately adjoining to the lakes and stream, so that stormwater runoff cannot be captured or infiltrated.
2d. If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
? Certified Local Government
2e. Who will be responsible for the review of the Stormwater Management Plan? ? DWQ Stormwater Program
? DWQ 401 Unit
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project? City of Burlington and Alamance
County
® Phase II ® NSW
3b. Which of the following locally-implemented stormwater management programs apply ? USMP
(check all that apply): ® Water Supply Watershed
? Other:
3c. Has the approved Stormwater Management Plan with proof of approval been ? Yes ? No
attached?
4. DWQ Stormwater Program Review
? Coastal counties
4a. Which of the following state-implemented stormwater management programs apply ® HQW ? ORW
(check all that apply): ? Session Law 2006-246
? Other:
4b. Has the approved Stormwater Management Plan with proof of approval been
h
d?
tt
? Yes ? No
a
ac
e
5. DWQ 401 Unit Stormwater Review
5a. Does the Stormwater Management Plan meet the appropriate requirements? ? Yes ? No
5b. Have all of the 401 Unit submittal requirements been met? ? Yes ? No
Page 11 of 13
PCN Form - Version 1.3 December 10, 2008 Version
F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1 a. Does the project involve an expenditure of public (federal/state/local) funds or the ®Yes ? No
use of public (federal/state) land?
1 b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State (North ? Yes ® No
Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
l
tt
? Yes ? No
er.)
e
Comments: Repair and maintenance of existing dams does not require a SEPA EA.
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, or ? Yes ® No
Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after-the-fact permit application? ® Yes ? No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s): Sediment removal
from the Old Stony Creek Dam Tailrace (18 cu.yd, 200 sq.ft.) began in November prior to permitting. None of the other proposed work has
commenced as of this revised PCN application date (December 6).
3. Cumulative Impacts (DWQ Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in ?Yes ®No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
Project will not increase lake elevation or water withdrawal capacity; it is solely for dam safety purposes, not for growth.
4. Sewage Disposal (DWQ Requirement)
4a. 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.
NA
Page 12 of 13
PCN Form - Version 1.3 December 10, 2008 Version
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or ?Yes No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act ®Yes ? No
impacts?
5c. If yes, indicate the USFWS Field Office you have contacted. ® Raleigh ? Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Critical Habitat?
RJG&A consulted the US-FWS and NC-NHP lists of protected species reported from Alamance County and the NC-NHP virtual
workroom for rare species and significant natural areas on the Lake Burlington USGS Quadrangle. No federally protected species is
known to occur in Alamance County. The Carolina darter and Eastern lampmussel are two State-protected animals known from Stony
Creek and tributaries, but are not reported in the immediate vicinity of either dam and are not likely to be affected.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? ? Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
NC-DMF and NC-WRC
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation ?Yes No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
RGJ&A submitted a project scoping letter and project area maps to the State Historic Preservation Office, which provided a "no
comment" response letter dated 09 Nov 2010.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain? ® Yes ? No
8b. If yes, explain how project meets FEMA requirements: This project will not affect the hydrologic or hydraulic characteristics of
Stony Creek and will not modify the existing regulatory floodway, effective base flood elevations, or Special Flood Hazard Areas at
either dam. Work will be below existing grade and disturbed areas will be restored similar to pre-construction grades, except along the
left bank below Old Stony Creek Dam, where the concrete toe wall and riprap fill to be placed for stabilization will slightly change the
channel's cross-sectional profile, but will preserve the cross-sectional area. The intent of this project is to improve the safety and
stability of these two dams in accordance with NC Dam Safety Program policies.
8c. What source(s) did you use to make the floodplain determination? The FEMA floodplain determination was based on the Flood
Insurance Rate Map (FIRM) Panel 8886 for Alamance County, NC.
G
ld P ? I
era
ottern 06 December 2010
Applicant/Agent's Signature
Applicant/Agent's (Agent's signature is valid only if an authorization letter from the applicant is Date
Printed Name provided.)
Page 13 of 13
PCN Form - Version 1.3 December 10, 2008 Version
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