20021351 Ver 1_Complete File_20020823

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STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
MICHAEL F. EASLEY
GOVERNOR
1584 YANCEYVILLE STREET, GREENSBORO, NC 27415
August 19, 2002
Mrs. Jean Manuele
U.S. Army Corps of Engineers
Regulatory Field Office
6508 Falls of the Neuse Road, Suite 105
Raleigh, North Carolina 2761
(Two Copies)
Mr. John Hennessy
Wetlands/401 Unit
NC DENR Division of Water Quality
1650 Mail Service Center
Raleigh, NC 27699
(Courtesy Copies - Three)
021351
LYNw TIPPETT
SECRETARY
?s V
j AUG
2 3 2002 ` ii `'
Aj* ASUBJECT: Alamance County, Replacement of Pipe 00-2200 on Greensboro-Chapel Hill Road
(SR 1005) across Unnamed Tributary to Mary's Creek. W.O. # 5.4752.
To Whom It May Concern:
The North Carolina Department of Transportation (NCDOT) proposes to replace Pipe 00-2200 due
to structural deficiencies in the existing pipe. Approximately 40% of the bottom os the existing
structure is rusted out. This activity will result in the placement of new fill and dewatering. The
NCDOT anticipates that the proposed filling activities will be authorized under Nationwide Permit 3
and the dewatering operations will be authorized under NWP 33. This application is intended as a
request for formal written authorization from the USACE to place new fill in the stream under NWP
3; and dewater the stream under NWP 33. This application is also intended to provide a courtesy
copy to the North Carolina Division of Water Quality. The following information is being
provided to satisfy Nationwide Permit Condition 13 (Federal Register January 15, 2002).
PHONE [phone] FAX [phone]
PROJECT INFORMATION
Road Name SR Number Structue Number
Greensboro-Chapel Hill 1005 Pipe 00-2200
Road

River Basin: DWQ Stream Name
ID
Cape Fear 16-26 UT to Mary's Creek
Buffer Rule Conditions Water Quality
Buffer Rulesa where applicable) Designation
No Not Applicable C NSW
Protected Species Presentb- CAMA Essential Fishery Habitat
AEC
No No No
Separate documentation attached, as needed: ° See the attached Endangered Species Review Sheet for Curtner
information.
STRUCTURE REPLACEMENT INFORMATION
Existing 40' long 60" CMP Proposed 60' long 95" X 67" CMPA
Structure Structure
Construction Pump around with off-site detour Dewatering ABC aggregate
Method Device*
Burial Depth 1' below streambed E/C Plan See construction sequence
Date
Construction As soon as practicable Duration 4 weeks
Date
Impacts ft. 20-enclosure; 40-rip-rap dissipaters;40-temporary
Temporary Temporary impacts include the placement of cofferdams to dewater the
Impacts channel and silt screens to prevent incidental sediment loss. Temporary
impacts will be contained within the confines of the rip-rap dissipaters.
Restoration Within 15 working days of the of the activity all temporary structures
Plan (cofferdams and silt screens) will be entirely removed and natural stream
contours will be restored and seeded.
Special Not Applicable
Conditions
RCP = reinforced concrete pipe; CMP = Corrugated metal pipe; CMPA = Corrugated metal pipe arch; Gil; _
Erosion control. *A less intrusive dewatering device may be used in lieu of the one proposed.
MINIMIZATION INFORMATION
Impacts will be minimized by strict enforcement of Best Management Practices for the protection of
surface waters and wetlands, restrictions against the staging of equipment in or adjacent to waters of
the US, and coordination with the Division Environmental Officer.
-2-
MITIGATION INFORMATION
Stream mitigation is not anticipated, as the impacts to any individual stream do not exceed 150 feet.
APPLICATION INFORMATION
Enclosed please find the Pre-construction Notification Form and supporting documentation for the
above referenced project. If you have any questions or need any additional information, please
contact Dennis Johnson at [phone] or Len Smith at [phone]. Your time and effort
are appreciated.
SiF ,
Mills, P.E.
Division Engineer, Division 7
b?/?o z
cc: Mr. Lenwood E. Smith, II, PWS, Division Environmental Officer
Mr. Dennis Johnson, Bridge Maintenance Engineer
Mr. Donald Pearson, Area Roadside Field Operations Engineer
Mr. J.L. Cornell, Bridge Maintenance Supervisor, Alamance and Orange County
Ms. Renee Gledhill-Earley
-3-
Office Use-Only' Form Version May 2002
USACE Action ID No. DWQ No. 021351
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
1. 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
2. Nationwide, Regional or General Permit Number(s) Requested: NWP 3 and 33
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 Wetlands Restoration Program (NC)ARP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), 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: ?
H. Applicant Information
1. Owner/Applicant Information
Name: Mr. J M Mills P E Division Engineer - Division 7
Mailing Address: P.O. Box 14996
Greensboro NC
Telephone Number: [phone] Fax Number: [phone]
E-mail Address: mmill @dot state nc us
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: Not Applicable
Company Affiliation:
Mailing Address:
Telephone Number: Fax Number:
E-mail Address:
Pagel of 8
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: Replacement of Pipe 00-2200 on Greenboro-Chapel Hill Road (SR 1005)
2. T.I.P. Project Number or State Project Number (NCDOT Only): 5.4752 (non-TIP)
3. Property Identification Number (Tax PIN): Not Applicable
4. Location
County: Alamance Nearest Town: Graham
Subdivision name (include phase/lot number): Not Applicable
Directions to site (include road numbers, landmarks, etc.):
The project is southeast of Graham. From I-40/85 take exit 147 onto Hwy -87. Proceed
south down Hwy-87 for 10.3 miles. Turn right at the intersection of Hwy-87 and
Greensboro- Chapel Hill Road (SR 1005) Pipe 00-2200 is located approximately 200 feet
west of the intersection of HM-87 and SR 1005
5. Site coordinates, if available (UTM or Lat/Long): See the attached USGS map.
(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): Not Applicable
7. Nearest body of water (stream/river/sound/ocean/lake): UT to Mary's Creek
8. River Basin: Cape Fear
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
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 site is bounded by successional old fields, a floodplain
forest and a gas station
Page 2 of 8
10. Describe the overall project in detail, including the type of equipment to be used:
The project will involve the replacement of crossline pipe that is structurally deficient. A
construction methods consistent with the attached construction sequence or a less intrusive
construction method will be used. Equipment used will be standard road construction
equipment Ctrackhoe grader backhoe and bulldozer).
11. Explain the purpose of the proposed work: To replace a structurally deficient structure.
Structural modifications are being made to bring the existing structure up to standard
specifications
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.
Not Applicable
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.
Not Applicable
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. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must 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 3 of 8
1. Provide a written description of the proposed impacts: Permanent stream impacts will
result from channel enclosure and placement of rip-rap energy dissipaters. Temporary stream
impacts will result from placement of cofferdams and siltscreens. Cofferdams and silt screens
will be removed within 15 days of project completion
2. Individually list wetland impacts below:
Wetland Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Located within
100-year Floodplain**
es/no Distance to
Nearest Stream
linear feet
Type of Wetland***
N/A

* List each impact separately and identify temporary impacts. impacts include, out are not umned to: mecnaiuceu c,caiu,g,auu,?, ....>
excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at http:/hvww. fema. aov.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: Not Applicable
Total area of wetland impact proposed: Not Applicable
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
(indicate on ma)
Type of Impact* Length of
Impact
(linear feet)
Stream Name** Average Width
of Stream
Before Impact Perennial or
Intermittent?
leasespecify)

1
Pipe replacement 20(en)
40(tmp)
40
UT to Mary's Creek
6.0'
Perennial

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss(gain),
stabilization activities (cement wall, rip-rap, crib wall, 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
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
vo w.usss.sov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
,,v\vw.mapguest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: 20- enclosure (en
40- temporary (tmp) 40- rip ra(m)
Page 4 of 8
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Name of Waterbody

(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.
N/A

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. 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.): Not Applicable
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): Not Applicable
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
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.
The proposed activity is being conducted to replace a structurally deficient structure and insure
the public safety. Impacts will be minimized by strict enforcement of Best Management
Practices for the protection of wetland and surface waters restrictions against the staging of
equipment in or adjacent to waters of the US and coordination (including a pre-construction
meeting) with the Division Environmental Officer.
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.
Page 5 of 8
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, 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 NCWRP 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.
A finding of insignificant impact is anticipated; therefore a mitigation plan is not provided
Permanent impacts are less than 150 feet. No Outstanding Resource Waters, federally
protected species or their habitats or essential fishery habitats occur in the project area. The
project is located in a High Quality Water.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o enr.state.nc.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): Not Applicable
Amount of buffer mitigation requested (square feet): Not Applicable
Amount of Riparian wetland mitigation requested (acres): Not Applicable
Amount of Non-riparian wetland mitigation requested (acres): Not Applicable
Amount of Coastal wetland mitigation requested (acres): Not Applicable
Page 6 of 8
III.
X.
Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ® No ?
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
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
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
(Neuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ? No ® If you answered "yes", provide the following information:
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.
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 N/A 3
2 N/A 1.5
Total N/A
* Zone 1 extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
Page 7 of 8
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or.0260.
Not Applicable
XI. Stormwater (required by DWQ)
Describe impervious acreage (both 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.
The proposed activity involves the replacement of an existing, structure with no addition to the
travel lane, therefore the percent new impervious surface equals 0%. Because the percent new
impervious surface is less than 30% stormwater controls are not being provided.
XH. 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.
Not Applicable
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H.0500) or any Buffer Rules?
Yes ? No ?
Is this an after-the-fact permit application?
Yes ? No ?
XIV. 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).
Agent's Signature hate"
is valid only if an authorization letter from the applicant is provided.)
Page 8 of 8
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Name: SAXAPAHAW Location: 17 652610 E 3974888 N
Date: 8/19/2002 Caption: Location of the permitted activity - Pipe 00-2200
Scale: 1 inch equals 2000 feet
NATURAL RESOURCE EVALUATION SHEET
FOR STRUCTURES
State Project # Structure Number Road Name SR Number county Investigator(s)
5.4752 Pipe 00-2200 Greensboro Chapel Hill Road SR 1005 Alamance Len Smith
Date: Stream Name DWQ ID. Stream Type River Basin:
08/19/02 UT to Mary's Creek 16-26 Perennial Cape Fear
Water Quality
Desi nation Buffer Rules (Type) High Quality or Rare
Wetlands Federally Threatened or
Endangered Species
C NSW No No No
Profile Information
Location Width OHW Depth (OHWM) Width OB Depth OB
Upstream 5.0' 1.0' 6.0' 1.5'
Downstream 7.0' 2.0' 9.0' 6.0'
AVERAGE 6.0' 1.5' 7.5' 3.8'
OHWM = Measurements made from Ordinary High Water Marker, -1 Ub = Measurements maae rrom me
Top of the Bank
General Notes/Comments: The pipe inlet is blocked by what appears to be an old muskrat lodge.
Division Environmental Officer
August 19, 2002
Date
ENDANGERED SPECIES REVIEW FOR DIVISION 7
DISTRICT I
State Project # SR Number Road Name Structure Conn
5.4752 1005 Greensboro-Chapel Hill Road Pipe 00-2200 Alamance
Alamance County
No Endangered or Threatened Species are listed.
Orange County
River Basin: Cape Fear
Bald Eagle (Haliaeetus leucocephalus). Cane Creek (Cape Fear Basin) Area.
Is the activity within the primary or secondary zone Yes D No
Smooth Coneflower (Echin 'cea laevigata) May be surveyed for from June to Se tember
Habitat Survey Date Investigator(s) Man-hours Comments/Findings
N/A
Michaux's Sumac ()R?hus michauzit) May be surve ed for from May to October
Habitat Survey Date Investigator(s) Man-hours Comments/Findings
NIA
Small Whorled Po onia Isotria medeoloides) May survey ed for from Ma to June
Habitat Survey Date Investigator(s) Man-hours Comments/Findings
N/A
Red Cockaded Woodpecker (Picoides borealis)
Habitat Survey Date Investigator(s) Man-hours Comments/Findings
N/A
Dwarf Wedge Mussel (Alasmodonta heterodon) - Neuse Basin
Habitat Survey Date Investigator(s) Man-hours Comments/Findings
N/A
James inymussel (Pleurobema collina) - Roanoke Basin
Habitat Survey Date Investigator(s) Man-hours Comments/Findings
N/A
General Notes/Comments: Habitat for terrestrial species known to occur in nearby counties was not
present within the immediate vicinity of Pipe 00-2200.
August 19, 2002
Division Environmental Officer Date
NCDOT
HAZARDOUS SPILL BASIN CHECKLIST
Division Seven County Alamance Project ID: 5.4752
River Basin Cape Fear Bridge No:
Route 1005 Stream UT to Mary's Creek
Water Quality Criteria
Yes No
Stream Crossing Blueline on USGS ? N
ORW ? N
WSI ? N
WS H, III, or IV Crossing Within 0.5 mi. of W.S. Critical Area ? N
Roadway Criteria
Route Designation Yes No
Arterial Urban ? ?
Arterial Rural N ?
Additional Site Information: The project is associated with pipe 00-2200
Yes No
Is a Hazardous Spill Basin Required? ?
Criteria Based Upon NCDOT "Best Management Practices for the
Protection of Surface Waters" (March, 1997).
August 19, 2002
Pipe 00-2200
Construction Sequence and Erosion Control Plan for Replacement of
Pipe with Pipe Using a Pump Around - Alamance County, SR 1005
Work to begin as soon as practicable following authorization.
Construction is anticipated to take 4 weeks.
1. Install a rock silt dam downstream of the work area to prevent incidental sediment
loss.
2. Install ABC aggregate or a less intrusive dewatering device to allow dewatering of
the work area.
3. Install pumps to divert flow around the work area.
4. Remove one existing line of 40' long 60" CM pipe.
5. Excavate to sufficient depth to allow burial of the pipe to 1', place base stone, and
single line of 60' long 95" X 67"" CM pipe arch.
6. Backfill the new line of pipe and place rip rap only as needed.
7. Starting from the downstream end, remove the dewatering device and restore the
natural stream contours.
8. Notify landscape department for final seeding.
9. Silt fences to be placed as site conditions require.
10. A 10' X 15' dirt bag will be used to remove excess water in the hole where the new
pipe is being replaced.
11. Site conditions and weather may alter these plans.
12. A method less intrusive than a pump around system may be utilized if site conditions
allow.
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View downstream from Pipe 00-2200. The photo is taken past a blowhole at the pipe outlet.
View of the blowhole at the outlet of Pipe 00-2200

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View of the Pipe 00-2200 inlet.

View of the Pipe 00-2200 outlet.
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View immediately upstream from Pipe 00-2200.