N-0002-12 SCM Inspection 4.6.2022

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Industrial Facility Inspection

Inspection Item Value
Inspection Id 850046
Entity Uid 199
Location
Inspection Date 4/6/2022 10:52:00 AM
Inspected By DUFFY, PETER E
Recommendations Cat tails need to be addressed throughout the device and a drainage structure, pine
trees need to be cut on the banks There is some evidence of ant hills it when we
need to be taken care of
Actual Finish 4/6/2022 10:52:00 AM
Date Closed
Closed By
Status COMPLETED
X Coordinate (State Plane) 2125971.29112381
Y Coordinate (State Plane) 778744.49027506
Initiated By DUFFY, PETER E
Link https://cityworks.raleighnc.gov/cityworks/WorkManagement/InspectionEdit.aspx?
InspectionId=850046

Observations / Results
Question Answer
Inches of rain in the last 24/48 hours? 0.5
Are banks stabilized with vegetation? Yes
If no, comment:
Is drainage structure free of debris and functioning? Yes
If no, comment:
Are outlets clear and functioning? Yes
If no, comment:
Is spillway clear and functioning? No
Are there invasive plants needing attention? No
If yes, comment: Cattails in device pine trees on banks need attention
Is dam free of trees and unwanted growth? Yes
If no, comment:
Overall Assessment of device? Partially Functional

Map Placeholder Image
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Photo Log 4/6/2022

Photo Log 4/6/2022

1/25/2022
3/28/2022
LFJ
10/1/2022
NE Remote Ops Facility Burwell – Wet Pond N-0002-12
AECOM
5438 Wade Park Boulevard, Suite 200
Raleigh, North Carolina 27607
Project name:
City of Raleigh Annual SCM Inspection Program
Project ref:
60666998
To:
Courtney Licata, PE
SCMs and Dams Asset Management
City of Raleigh Engineering Services Department
127 West Hargett Street
Raleigh, North Carolina 27601
CC:
Scott Bryant, PE – City of Raleigh
Brad Stuart – City of Raleigh
Alex Nice, PhD, PE – AECOM
From:
Sujit Ekka, PE
Kirstin Szogas, EI
Jenna Bacic
Date:
January 25, 2022
Memorandum
Subject:City of Raleigh Annual SCM Inspection – NE Remote Ops Facility Burwell N-0002-12, Wet Pond
Introduction
AECOM Technical Services of North Carolina, Inc. (AECOM) was retained by the City of Raleigh (City) to conduct stormwater
control measure (SCM) inspections as part of the City’s annual SCM inspection program. The scope of the inspections consists
of an on-site visual assessment of the SCMs and comparison to available approved design information (i.e., as-built drawings,
O&M manuals, etc.). The scope of work does not include any structural assessment or conducting of maintenance activities.
No previous records of maintenance or structural repairs were provided by the City.
This memorandum (memo) was prepared to document and present the findings of the inspection conducted for the wet pond
device, located at 7700 Burwell St, Raleigh, NC. The remainder of this memo presents SCM background information, the
inspection methodology, a summary of the inspection findings, and any maintenance recommendations.
SCM Background Information
The wet pond is located on NE Remote Ops Facility property and collects facility runoff. The function of the wet pond is to
collect, store, and treat runoff from the NE Remote Ops Facility. Exhibit A shows an overview of the pond.
Annual SCM Inspection
NE Remote Ops Facility Burwell – Wet Pond N-0002-12
NE Remote Ops Facility Burwell - Wet Pond N-0002-12
Exhibit A. Wet Pond located at the NE Remote Ops Facility (Burwell)
Inspection Summary
The wet pond was inspected on November 18
th by an AECOM SCM Inspection Field Crew, including an AECOM engineer. The
weather at the time of inspection was dry, partly cloudy, and approximately 72°F. The entirety of the wet pond was walked by
the team of AECOM staff listed previously. The overall condition of the wet pond, inlets, outlet, forebay, emergency spillway,
and embankment were inspected.
Each component of the devicewas also given an individual status code (Fully Functional, Partially Functional, or Not Functional)
based on its condition. Lastly, the overall device was scored (0 to 4) to provide a quantitative assessment of the condition at
the time of inspection. During the inspection, detailed observations, photographs and scores were documented and recorded
on SCM inspection forms using Survey123 for ArcGIS, which are provided herein as Attachment A.
A summary of the inspection, listed by individual component, is presented below which is intended to highlight items that require
monitoring, repair, or further investigation.
Inlet Points (2)
Status: Fully Functional (FF) - All components are in good working order
Inlet 1
Inlet 1 is comprised of one 36” RCP pipe with flared end section, discharging into the southern portion of the forebay. At the
time of inspection, pine trees were observed near the inlet pipe; these should be removed. Grout on the interior of the pipe
appeared inadequate and there was a small pool of water visible. It was unclear if this pool was as a result of a leak in the
grout; this should be investigated.
Inlet 2
Inlet 2 is comprised of one riprap lined swale, discharging into the southern portion of the forebay adjacent to Inlet 1. At the
time of inspection, overgrown weeds were beginning to clog the riprap, and a pine tree sapling was observed. Cattails were
also noted growing at the downstream end of Inlet 2; these should be removed.
Annual SCM Inspection
NE Remote Ops Facility Burwell – Wet Pond N-0002-12

NE Remote Ops Facility Burwell - Wet Pond N-0002-12
Forebay
Status: Fully Functional (FF) - All components are in good working order
Per the as-built documents, the forebay is equipped with a submerged riprap transition berm and sediment stick. The transition
berm was visible beneath the surface of the water and appeared to be clear of vegetation and sediment. The sediment stick
was unable to be inspected due to the depth of the water around the berm. At the time of inspection, cattails, phragmites and
some woody saplings were present in the forebay and along the vegetated shelf. The water in the forebay appeared clear and
there was no apparent sediment accumulation.
Basin
Status: Fully Functional (FF) - All components are in good working order
At the time of inspection, invasive plants (cattails and phragmites) were present along the vegetated shelf, as well as some
woody saplings. However, the other plantings along the vegetated shelf appeared to be healthy. A minor sheen was observed
on the water in the main basin, this should be investigated. Goldfish were observed throughout the basin and in the forebay.
Outlet Structure
Status: Partially Functional (PF) - Device is functional, but some components may need minor repair
This wet pond is equipped with one outlet structure composed of a concrete riser with trash rack. A 6” PVC pipe with a
downturned elbow serves as the primary drawdown device and was flowing at the time of inspection. A 6” DIP drain equipped
with a 6” plug valve and handwheel was present at the bottom of the riser, however the valve is designed to remain closed
unless there is an emergency or maintenance is required. A 24” RCP pipe conveys flow from the outlet structure and discharges
downstream beyond the emergency spillway. During the inspection a bulge in the concrete was observed on the southwest
side of the interior of the riser, with a wet spot below. Another large wet spot was observed below the riser joint on the northeast
interior side. The gate value was unable to be turned, as it was locked. Cattails and phragmites were observed surrounding
the riser.
Emergency Spillway
Status: Fully Functional (FF) - All components are in good working order
The emergency spillway is equipped with riprap and is lined with non-woven fabric. There were no maintenance needs
identified.
Embankment
Status: Fully Functional (FF) - All components are in good working order
At the time of inspection, ant hills were observed throughout the embankment. There were no other maintenance needs
identified.
It should be noted that specific direction on how to address each item, beyond routine maintenance e.g. vegetation
management, is considered outside the scope of this memo. Items requiring further repair should be addressed by a licensed
engineer or landscape architect and are noted as such.
Upon completing the inspection, the overall score for the wet pond was determined to be a 3 out of 4, which places the wet
pond in the “Good” condition category. A device in “Good” condition is characterized as follows: “Device is functioning properly
as intended. Minor maintenance needs identified that can enhance SCM performance. No imminent damage to downstream
water quality.”
Maintenance Needs
The maintenance needs identified during the inspection are presented in two categories within the SCM form: (i) immediate
corrective action needed; and (ii) routine maintenance items. Following inspection, there were no immediate corrective actions
identified. The routine maintenance items are as follows:
x Remove unwanted vegetation (cattails, willow saplings, pine saplings, and other woody vegetation).
x Investigate presence of goldfish.
x Investigate riser leaks.
Annual SCM Inspection
NE Remote Ops Facility Burwell – Wet Pond N-0002-12
NE Remote Ops Facility Burwell - Wet Pond N-0002-12
x Remove undesirable vegetation clogging riprap at Inlet 2
x Remove/treat ant hills found on embankment
Closing
No deviations were noted from the approved plans. The above observations represent conditions of the wet pond at the time
of the inspection in all areas which were accessible. The wet pond at the NE Remote Ops Facility (Burwell) was found to be in
good condition, denoted by a final score of 3.AECOM further recommends that the SCM be inspected routinely by maintenance
personnel, and a qualified professional (licensed engineer, landscape architect, or land surveyor) should be consulted
immediately when conditions of the device or appurtenant features, whether mentioned in this report or not, change suddenly.
Please do not hesitate to call the undersigned at 919-461-1389 if you have any questions or comments on this submittal.
Sujit Ekka, PE
Figures
Figure 1 – SCM Location Map
Attachments
Attachment A – Inspection Form with Photos

NE Remote Ops Facility Burwell – Wet Pond N-0002-12

Figures
!(
Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics,
CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid,
IGN, IGP, swisstopo, and the GIS User Community
Figure 1 - NE Remote Operations Facility (Burwell) Wet Pond Location (N-0002-12)
Wet Pond
Burwell St
±
0 100 200 300 40050
Feet
0DS&UHDWHG1RYHPEHU

NE Remote Ops Facility Burwell – Wet Pond N-0002-12

Attachment A – Inspection Form
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 1 of 30 GENERAL INFORMATION SCM TYPE: Wet Pond SCM FACILITY ID: 199 SCM N-ID: N-0002-12 SCM PHYSICAL LOCATION: 7700 Burwell St INSPECTORS NAME: Kirstin Szogas OTHER INSPECTOR: Jenna Bacic, Sujit Ekka INSPECTION DATE AND TIME: November 18, 2021 1:13 PM DATE OF LAST INSPECTION: October 22, 2020 ANNIVERSARY DATE: July 22, 2014 WEATHER CONDITIONS: (AIR TEMP, PRECIPITATION, ETC.) Partly cloudy 72 degrees DATE OF LATEST RAINFALL: 11/12/2021 AMOUNT OF RAINFALL IN LAST 3 DAYS: 0 in GROUND MOISTURE CONDITIONS: Dry SITE CONDITIONS: Stable INSPECTORS NOTES Site inspected by AECOM Engineer on November 18, 2021. Rainfall amounts were based on daily precipitation values reported by the North Carolina State Climate Office Cardinal Database for the Lake Wheeler Rd Field Lab. GENERAL
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 2 of 30 INLET POINTS – INLET 1 ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Trash, sediment, debris present at or obstructing the inlet No No Action Evidence of erosion or undercutting at the inlet No No Action Structural damage to the inlet pipe including joint separation Yes Investigate Adequate stabilization present (e.g., riprap, concrete, filter fabric) Yes No Action The riprap or stabilization is clogged and/or covered in sediment No No Action Undesirable vegetation present Yes Repair Notes: Inlet was unobstructed with no apparent erosion or sedimentation. Some inadequate grouting was observed in the interior of the pipe, with a wet spot adjacent to it. Cattails and pine trees should be removed.
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 3 of 30Interior of inlet has inadequate grouting Inlet overview
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 4 of 30Pine trees should be removed
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 5 of 30 INLET POINTS – INLET 2 ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Trash, sediment, debris present at or obstructing the inlet No No Action Evidence of erosion or undercutting at the inlet No No Action Structural damage to the inlet pipe including joint separation N/A No Action Adequate stabilization present (e.g., riprap, concrete, filter fabric) Yes No Action The riprap or stabilization is clogged and/or covered in sediment No No Action Undesirable vegetation present Yes Repair Notes: There is overgrown grass and a pine tree that should be removed from the riprap lined swale.
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 6 of 30Inlet overview Undesirable vegetation
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 7 of 30Remove pine tree Cattails near inlet
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 8 of 30 INLET POINTS Status Code Partially Functional (PF) - Device is functional, but some components may need minor repair Overall Notes: See above
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 9 of 30 FOREBAY ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Riprap or stabilization clogged or covered in sediment No No Action Excess sediment displaced 50% or more of the design storage capacity No No Action Erosion or bare areas present No No Action Signs of erosion present on the transition berm (if applicable) N/A No Action Undesirable vegetation present Yes Repair Side slopes maintained/mowed Yes No Action Status Code Fully Functional (FF) - All components are in good working order Notes: Cattails and woody vegetation should be removed from banks. Water is clear and the forebay doesn’t appear to have significant sediment deposits. A very large school of goldfish was observed (see miscellaneous photos).
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 10 of 30FOREBAY PHOTOSMore cattails on forebay Forebay overview
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 11 of 30Transition berm with woody vegetation
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 12 of 30 TREATMENT AREA/BASIN ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Algae covering over 50% of the water surface No No Action Undesirable vegetation covering 50% of basin surface (e.g., cattails, phragmites) No No Action Sediment accumulated to a depth greater than the original design sediment storage depth No No Action Trash/debris present No No Action Erosion or bare areas present in the basin No No Action The riprap or stabilization is clogged and/or covered in sediment N/A No Action Side slopes maintained/mowed Yes No Action Evidence of geese or other waterfowl residence in the pond or other water quality issues No No Action Plants growing on vegetated shelf dead, unhealthy, or undesirable Yes Repair Plants on the vegetated shelf need pruning? No No Action
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 13 of 30 Water surface higher or lower than the design water surface elevation No No Action Status Code Fully Functional (FF) - All components are in good working order Notes: Cattails, phragmites, and woody saplings were observed throughout the vegetated shelf. Minor sheen observed on water, this should be investigated.
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 14 of 30TREATMENT AREA/BASIN PHOTOSVegetation on banks needs to be maintained Cattails near riser
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 15 of 30Willow trees and other woody saplings should be removed Sheen on water
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 16 of 30 OUTLET STRUCTURE – OUTLET 1 ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Structural damage to the pipe(s) or riser structure No No Action Pipe(s) or riser structure leaking Yes Repair Orifices, weirs, pipes, or riser structure clogged with trash, sediment or debris No No Action Outlet pipe obstructed/clogged with sediment/trash/debris No No Action Sluice gate operating through the intended range of motion N/A No Action Trash, sediment, or debris clogging/obstructing trash rack No No Action Trash rack damaged No No Action Water able to flow freely to the outlet control structure Yes No Action Undesirable vegetation present? Yes Repair Erosion or other signs of damage at the outlet? No No Action Evidence of trash/debris downstream of outlet pipe or at the dissipator pad (if present) Yes Monitor
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 17 of 30 Evidence of erosion downstream of outlet pipe or around the dissipator pad (if present) Inaccessible No Action Notes: Bulge on southwest side of interior of riser with wet spot below. Another large wet spot below the riser joint on the northeast side. Cattails surrounding riser. Gate valve unable to be turned because it was locked.
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 18 of 30OUTLET PHOTOSInterior of riser and staining under lump in concrete Staining under joint
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 19 of 30Cattails and phragmites surrounding riser
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 20 of 30 OUTLET STRUCTURE Status Code Partially Functional (PF) - Device is functional, but some components may need minor repair Overall Notes: See above
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 21 of 30 EMERGENCY SPILLWAY ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Erosion or signs of instability No No Action Armoring satisfactory Yes No Action If vegetated, the grass height (between 6 and 12 inches) and cover is adequate N/A No Action Trash or debris present No No Action Undesirable or woody vegetation No No Action Status Code Fully Functional (FF) - All components are in good working order Notes: Emergency spillway is well armored and not eroded
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 22 of 30EMERGENCY SPILLWAY PHOTOSSpillway looking towards basin Spillway
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 23 of 30Downstream face
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 24 of 30 EMBANKMENT ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair Grass cover unhealthy or erosion on earthen embankment No No Action Grass appropriate height Yes No Action Signs of seepage on the downstream face No No Action Evidence of animal burrowing or activity No No Action Signs of piping, settling, scouring, cracking, or sloughing No No Action Woody or undesirable vegetation growing on embankment No No Action Status Code Fully Functional (FF) - All components are in good working order Notes:
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 25 of 30EMBANKMENT PHOTOSAnt hill on embankment Eastern embankment
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 26 of 30 DOWNSTREAM/MISCELLANEOUS ASSESSMENT OBSERVATIONS ACTION Monitor Investigate Repair SCM accessible both on foot and by vehicle Yes No Action Access to the SCM components are clear and adequate for maintenance equipment mobilization Yes No Action Evidence of herbicide/fertilizer use in or around the device No No Action Local or adjacent land disturbing activity present No No Action Drainage area/overall site is stable Yes No Action Embankment section consists of retaining wall No No Action Status Code Fully Functional (FF) - All components are in good working order Notes: Large school of goldfish present in the forebay, goldfish were also present throughout the main treatment area.
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 27 of 30DOWNSTREAM/MISCELLANEOUS PHOTOSGoldfish in forebay Goldfish in forebay
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME:N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE:November 18, 2021 1:13 PMv 4. 07/05/19Page 28 of 30Overall photo
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 29 of 30 APPROXIMATE QUANTITY OF MAINTENANCE ITEMS REQUIRED Pipes Material: Length (ft): Material: Length (ft): Diameter (in): Diameter (in): Eroded area for reseeding (sf) None Trees >2” DBH removal (ea) None Other -
CITY OF RALEIGH SCM INSPECTION PROGRAM SCM NAME: N-0002-12 - NE Remote Ops Burwell Wet Pond INSPECTION DATE: November 18, 2021 1:13 PM v 4. 07/05/19 Page 30 of 30 SCM EVALUATION MAINTENANCE NEEDS ROUTINE MAINTENANCE NEEDED Remove unwanted vegetation (cattails, willow saplings, pine saplings, and other woody vegetation). Investigate presence of goldfish. Investigate riser leaks. Remove ant hills. IMMEDIATE CORRECTIVE ACTION NEEDED None. LEVEL OF SERVICE PROBABILITY OF FAILURE: Low CONSEQUENCE OF FAILURE: Low SCORE: 3 SCORING 4 Excellent Condition. Device is functioning properly as intended. No maintenance needs identified. No imminent damage to downstream water quality. 3 Good Condition. Device is functioning properly as intended. Minor maintenance needs identified that can enhance SCM performance. No imminent damage to downstream water quality. 2 Fair Condition. Device is functioning properly as intended. Moderate (routine and non-routine) maintenance needs identified. No imminent damage to downstream water quality. 1 Poor Condition. SCM is not functioning as intended. Major maintenance required to restore SCM function. Potential of damage to downstream water quality. 0 SCM is not functioning. Significant maintenance required to restore SCM function. Potential of damage to downstream water quality.
Stormwater Maintenance and Operation
Manual
For the proposed
City of Raleigh -
North East Remote Operations Facility
Burwell Wet Pond BMP
Raleigh, North Carolina
Prepared for
City of Raleigh
Prepared By
Stewart Engineering, Inc.
Proposed Improvements
The proposed redevelopment of the site includes the removal of one existing
building, two of the covered storage buildings and portions of the existing asphalt
and gravel parking areas. Two new buildings will be constructed along with a
vehicle fueling area. Asphalt and concrete paving will be added as well. The new
development results in a net increase in impervious cover for the total project area
(including the portion of the drainage area on the Spottswood site) of 37,915 sf.
A wet detention pond will be added to the site as well and will capture
stormwater from a portion of the site. The specific design guidelines for the wet
pond were outlined in NCDENR’s BMP manual. The pond’s intent is to provide
quality and quantity control of rain events for 6.41 acres of runoff from the Burwell
site. Runoff is captured through sub surface storm pipes throughout the site and
discharged into the forbay of the proposed wet pond. As the pond fills during a rain
event, runoff is discharged downstream first through a 2” diameter orifice on the
precast concrete riser structure inside the footprint of the pond, then if necessary
the top of the riser structure. An emergency spillway can also act as a discharge
for the pond but will only be activated during heavy rain events. All runoff that
discharges from the wet pond ultimately ends up flowing into the existing creek just
downstream. The 2” diameter orifice will also control the normal water pool
elevation for the pond.
Maintenance for the wet pond will be needed for the pond to function
correctly and also to prevent any chance of pond failure. Review the operations
and maintenance generated by NCDENR with the BMP specific information provided
in this manual for specific items to check and what corrective items are needed if
an issue is discovered. Also, find included a cost estimate for the wet pond’s
construction cost. This includes a 24% cost breakdown of the wet pond cost as
required by the City of Raleigh.
Owner and Engineer Information
Owner: City of Raleigh
Bob Panella, PE
Project Engineer II
City of Raleigh, Construction Management Division
222 W. Hargett St.
Raleigh, NC 27601
Engineer: Roy Lorenzen, PE
Stewart Engineering
421 Fayetteville St. Suite 400
Raleigh, NC 27601
Operation and Maintenance and Cost Estimate
Permit Number:_______________________
(to be provided by DWQ)
Drainage Area Number:_________________
Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 4
Wet Detention Basin Operation and Maintenance Agreement

I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.

The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.

This system (check one):
does does not incorporate a vegetated filter at the outlet.

This system (check one):
does does not incorporate pretreatment other than a forebay.

Important maintenance procedures:
Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
Once a year, a dam safety expert should inspect the embankment.

After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.

Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/debris is present. Remove the trash/debris.
The perimeter of the wet
detention basin
Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
long.
Maintain vegetation at a height of
approximately six inches.
Permit Number:_______________________
(to be provided by DWQ)
Drainage Area Number:_________________
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or
swale
The pipe is clogged. Unclog the pipe. Dispose of the
sediment off-site.
The pipe is cracked or
otherwise damaged.
Replace the pipe.
Erosion is occurring in the
swale.
Regrade the swale if necessary to
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to
a depth greater than the
original design depth for
sediment storage.
Search for the source of the
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf Best professional practices
show that pruning is needed
to maintain optimal plant
health.
Prune according to best professional
practices
Plants are dead, diseased or
dying.
Determine the source of the
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area Sediment has accumulated to
a depth greater than the
original design sediment
storage depth.
Search for the source of the
sediment and remedy the problem if
possible. Remove the sediment and
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over
50% of the area.
Consult a professional to remove
and control the algal growth.
Cattails, phragmites or other
invasive plants cover 50% of
the basin surface.
Remove the plants by wiping them
with pesticide (do not spray).
Permit Number:_______________________
(to be provided by DWQ)
Drainage Area Number:_________________
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 4
BMP element: Potential problem: How I will remediate the problem:
The embankment Shrubs have started to grow
on the embankment.
Remove shrubs immediately.
Evidence of muskrat or
beaver activity is present.
Use traps to remove muskrats and
consult a professional to remove
beavers.
A tree has started to grow on
the embankment.
Consult a dam safety specialist to
remove the tree.
An annual inspection by an
appropriate professional
shows that the embankment
needs repair. (if applicable)
Make all needed repairs.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of
damage have occurred at the
outlet.
Contact the local NC Division of
Water Quality Regional Office, or
the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.

When the permanent pool depth reads _8.5_ feet in the main pond, the sediment
shall be removed.

When the permanent pool depth reads _4.5_ feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 274.5
Sediment Removal El. 270 Permanent Pool
Volume Sediment Removal Elevation 266 Volume
Bottom Elevation 269 1-ft Min.
Sediment Bottom Elevation 265 1-ft Min.
Storage Sediment
Storage
FOREBAY MAIN POND
Permit Number:_______________________
(to be provided by DWQ)
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:City of Raleigh - North East Remote Operations Facility Burwell Site
BMP drainage area number:1
Print name:Bob Panella, PE
Title:Project Engineer II
Address:City of Raleigh, Construction Management Division
Phone:[phone]
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, _____________________________________, a Notary Public for the State of
____________________, County of ____________________, do hereby certify that
______________________________________ personally appeared before me this
day of _________________, _______, and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires
3-May-12Construction Item QTYUnit Unit costTotal Cost2711 Chain Link Fences8' High 3-strand barb wire fence700LF $14.00 $9,800.00Pedestrian Access Gate1EA $1,000.00 $1,000.00312000 Earth Moving$0.00Rough Grading (cut/fill on site)2600CY $2.25 $5,850.00Fine Grade (Non-Pavement Areas)1800SY $1.50 $2,700.00Earthwork - Respread Topsoil (4")1800SY $2.00 $3,600.00$0.00312040 Erosion & Sediment Control$0.00Silt Fence500LF $2.50 $1,250.00NEROF Civil ItemsWet Pond Construction Cost EstimateOpinion of Probable Construction Costs323223 Segmental Retaining WallKeystone Retaining Wall290SF $20.00 $5,800.00329200 Lawns & GrassesSod1400SY $3.00 $4,200.00334100 Storm Drainage$0.00Junction Box1EA $3,500.00 $3,500.00RCP Drain Line - 24" 75LF $42.00 $3,150.00FES1EA $3,200.00 $3,200.00RipRap1EA $500.00 $500.00Pond Riser1EA $6,000.00 $6,000.00Project Subtotal$50,550.0024% City of Raleigh contribution calculation$12,132.00