NCC204687_NOT Closeout Documents (3)_20231120

Project Information Form -Annual BMP Maintenance Certification
A. General Information: (Fill out ALL information) PLEASE COMPLETE ALL BOXES—LEAVE NOTHING BLANK!
Current Project Names: Previous Project Names (if applicable):
Davis park East N/A
Legal Owner of Record/Permittee: Site Contact Entity: (Owner, Management Company, or HOA)
Alta Davis Park Owner LLC Wood Residential
Address: 3715 Northside Pkwy, Ste 4-600 Atlanta, GA Address: 3715 Northside Pkwy Nw Bldg 400-600
30327 Atlanta GA 30327-2857
Contact Name: Click here to contact name. Contact Name: Kristen Massey
Telephone Number: Click here to enter phone#. Telephone Number: 984-245-0001
Email address: Click here to enter email address. Email address: [e-mail]
Name of Inspection Company: Mailing Address of Inspection Company:
G2 Design P.A. P.O. Box 297 Apex, NC 27502
B. Project SCM Information. Use separate Inspection Checklist for each SCM.
Device Type #of SCMs Facility ID(s) Additional Description, as needed
per Site
Wet Detention Basin 1 13789
Level Spreader- VFS 1 13790
C. Submitted Under Cover (check all that apply) X❑ Inspection Checklist(s) © O&M Manual ❑ Implementation Schedule
D. BMP Maintenance Certifiers (BMC) Information
BMC Name: Timothy P.Grady Affix Seal and Sign Below
Address: G2 Design P.A. P.O. Box 297 Apex, NC 27502 ````````���(IAlg11, ''
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Telephone Number: 919-321-0638 '� �'..
Email address: [e-mail] =* crW- 1015 *
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Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
Important Note: It shall be noted that the items included in this inspection checklist are not an exhaustive list of inspection items for any particular facility.
As each facility is different,the City looks to the professional inspecting the facility to perform a comprehensive inspection of the facility and list all items
found during the inspection on the inspection checklist,even though all may not be listed on this checklist to begin with.
Checklist Status Codes
Fully Functional (No Problems Found) = Pass for Inspection
Minor Functional Issues, However Pass for Inspection *Refer to checklist status code notes below
Partially Functional (Repairs Needed) = Fail the Inspection
Not Functional (Repairs Needed) = Fail the Inspection
Monitor *Refer to checklist status code notes below
Not Applicable
*Checklist Status Code Notes:
1. Minor Functional Issues (MFIs)shall be corrected during routine maintenance throughout the year. In addition, BMCs
shall revise the facility's operation and maintenance (O&M)manual accordingly to address each MFI. BMCs shall
verify whether each MFI was resolved during subsequent annual inspections and indicate results on next year's
annual inspections report.
2. For items checked Monitor, BMCs shall revise the facility's O&M manual with frequency of monitoring needed and
include actions to be taken (if any). Please describe in the additional comments section, as needed.
Assessment Status Comments
INFLOW POINTS
Obstruction:
Fully Functional
vegetation/debris/sediment
Erosion/undercutting Fully Functional
Displacement/blockage of
inlet or rip-rap, aprons, fabric, etc. Fully Functional
Pipe condition Fully Functional
Other (describe) Pipes discharge through high retaining wall)
FOREBAY (AS APPLICABLE)
Sediment/debris accumulation Fully Functional
Bare soil/erosion on side slopes Fully Functional Surrounded by retaining wall
Invasive vegetation Fully Functional Algae currently within tolerance
Other (describe) Standard trash inflow managed as part of routine
maintenance
Wet Detention Basin Checklist for Annual SCM Report.Page 1 Of 7 Electronic Version 1.0/2013

Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
Assessment Status Comments
MAIN TREATMENT AREA
Note: Replace plants within littoral shelf as necessary per original approved construction plans. Invasive vegetation should be
no more than 5%of the surface area. Approval from Storm water Services shall be required prior to any application of herbicide
or other chemical application. If algae is dominant, causing blockage, or impairing any water quality/quantity aspect of the
facility, include photo and use best professional to determine whether condition warrants correcting prior to passing inspection.
Visible signs of water pollution (ex.
muddy water) Fully Functional
Sediment/debris accumulation Fully Functional
Trash accumulation Fully Functional
Littoral shelf condition Fully Functional Diversity/Quantity present overall with minor
weaker portions noted;continuing to establish
Invasive vegetation Fully Functional Minor presence of cattail/smartweed noted;
currently within tolerance
Algae cover issues (see above) Fully Functional Isolated areas of greater cover;within tolerance
overall
Bare soil/erosion on side slopes Minor Functional Issues At top of SW retaining wall;see O&M manual
Side slopes maintained as mowed/ Weaker establishment at north slope;see O&M
Monitor
covered manual
Emergency spillway properly
armored and free of woody Fully Functional none present per design
vegetation
Water level returns to permanent
pool elevation per design Fully Functional
drawdown time
Other (describe)
EMBANKMENT/DAM
*Note: Ideally shrubs/trees should not exist on an earthen embankment dam. However, if greater than 6"diameter breast
height; they should not be removed unless approved by Storm water Services staff. Approval from Storm water Services shall
be required prior to any application of herbicide or other chemical application.
Bare soil, erosion, loss of dam
material Fully Functional
Wet Detention Basin Checklist for Annual SCM Report.Page 2 of 7 Electronic Version 1.0/2013

Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
Assessment Status Comments
EMBANKMENT/DAM (CONTINUED)
*Note: Ideally shrubs/trees should not exist on an earthen embankment dam. However, if greater than 6"diameter breast
height; they should not be removed unless approved by Storm water Services staff. Approval from Storm water Services shall
be required prior to any application of herbicide or other chemical application.
Shrubs/trees present<6"diameter
breast height Fully Functional
Animal burrows Fully Functional
Grass cover is eroding/unhealthy Fully Functional
Signs of seepage on downstream
face Fully Functional
Signs of structural failure: i.e., Fully Functional
horizontal/vertical cracks
Upslope, top, and downslope
maintained as mowed Minor Functional Issues Downslope overgrown;see O&M manual
Overall structural condition Fully Functional
Other (describe)
OUTLET DEVICE
*Note:It is recommended that the pond drain be exercised twice a year to prevent seizing
Obstructed pipe, trash rack, or Fully Functional Separate low-flow siphon with headwall;conveys
draw-down orifice flow to separately-permitted Level Spreader
Erosion/undercutting Fully Functional
Joint failure/loss of joint material, Fully Functional
soil piping
Overall structural condition Fully Functional
Leaking devices Minor Functional Issues Seepage at outlet discharge pipe joint;see O&M
manual
Sediment in pipe Fully Functional
Wet Detention Basin Checklist for Annual SCM Report.Page 3 of 7 Electronic Version 1.0/2013

Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
Assessment Status Comments
OUTLET DEVICE (CONTINUED)
*Note: It is recommended that the pond drain be exercised twice a year to prevent freezing
Displacement/blockage of outlet or
Fully Functional High-flow discharges via riser to dissipater pad
rip-rap, aprons, fabric, etc.
Other (describe)
MISCELLANEOUS
Trash/debris Fully Functional
Access Fully Functional
Evidence of routine maintenance Fully Functional
Other (describe)
PHOTOGRAPHS: Attach low-resolution (500KB or less), digital color photographs of the site and SCM features. Include
describing the photographs.
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Photo 1: Overview of Wet Pond Photo 2: View of Inflow Points and Forebay Area
Wet Detention Basin Checklist for Annual SCM Report.Page 4 of 7 Electronic Version 1.0/2013

Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
PHOTOGRAPHS (CONTINUED)
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Photo 3: View of Retaining Wall and Established Plants in Littoral Photo 4: View of Dam
Shelf
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Photo 5: View of Low-flow Siphon (conveys to Level Spreader) Photo 6: View of High-flow Outlet Discharge
Wet Detention Basin Checklist for Annual SCM Report.Page 5 of 7 Electronic Version 1.0/2013

Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
ADDITIONAL COMMENTS:
Wet Detention Basin Checklist for Annual SCM Report.Page 6 of 7 Electronic Version 1.0/2013

Wet Detention Basin Checklist for Annual SCM Maintenance Certification
City of Durham, North Carolina
Facility ID: 13789 Date Oct 11, 2023
SCM Site/Project Name: Davis Park East
INSPECTION RESULTS
The results of this inspection are as follows:
PASS/ CERTIFIED
CHECK APPLICABLE BOX: IF THIS IS AFTER AN ENGINEERING MODIFICATION REPORT OR INITIAL FAILURE
INSPECTION FOUND NO PROBLEMS,AS IT RELATES TO THE FUNCTIONALITY OR PUBLIC SAFETY ASPECTS OF THE FACILITY.
PASS/ CERTIFIED/ MINOR ISSUES WHICH CAN BE CORRECTED THROUGH ROUTINE YEAR ROUND
1/ MAINTENANCE
INSPECTION FOUND MINOR PROBLEMS THAT ARE NOT HAVING AN IMPACT ON THE CURRENT FUNCTIONALITY OR PUBLIC
SAFETY ASPECTS OF THE FACILITY. HOWEVER, LEAVING UNADDRESSED THESE PROBLEMS WILL IMPAIR THE DEVICE'S LONG
TERM FUNCTIONALITY. MINOR PROBLEMS SHALL BE NOTED IN THE O&M MANUAL AS SUCH, MUST BE ADDRESSED
THROUGH ROUTINE MAINTENANCE,AND VERIFIED AT THE NEXT ANNUAL INSPECTION.
FAIL (REPAIRS CAN BE COMPLETED WITHIN 90 DAYS)
INSPECTION FOUND APARENT PROBLEMS WHICH NEED IMMEDIATE ATTENTION. COMPLETE THE REPAIR AND/OR
MAINTENANCE ITEMS INDICATED IN THE SEALED IMPLEMENTATION SCHEDULE WITHIN 90 DAYS OF THE DATE OF THIS
REPORT. RE-INSPECTION AND CERTIFICATION PRIOR TO OR AT THE 90 DAY INTERVAL WILL FOLLOW SATISFACTORY
COMPLETION OF ALL REPAIRS AND MAINTENANCE. REPORTS NOT RECEIVED AFTER 90 DAYS WILL AUTOMATICALLY
DEFAULT INTO ENFORCEMENT ACTIONS.
FAIL (REPAIRS CANNOT BE COMPLETED WITHIN 90 DAYS - EMR REQUIRED)
INSPECTION FOUND THAT THE FACILITY WAS NOT COMPLETED, OR WAS"COMPLETED" IN A MANNER THAT SIGNIFICANTLY
DIFFERS(NEGATIVELY) FROM THAT DETAILED IN THE ORIGINAL DESIGN PLANS, OR IS IN SUCH A STATE OF DISREPAIR OR
FUNCTIONAL FAILURE THAT A CERTIFICATION CANNOT BE REASONABLY PROVIDED WITHIN 90 DAYS FROM THE DATE OF
THE INSPECTION. SUBMIT ENGINEERING MODIFICATION REPORT(EMR) PER REQUIREMENTS FOUND AT:
HTTP://DURHAMNC.GOV/ICH/OP/PWD/STORM/PAGES/BMP-ANNUAL-MAINTENANCE-CERTIFICATION-AND-AS-BUILT-
CERTIFICATION-PROGRAMS.ASPX
Certification:
Based upon my inspection of this constructed SCM facility on Oct 11, 2023 I hereby certify that the facility's functional and
public safety aspects are (CHECK ONE ONLY) ✓ IN COMPLIANCE NOT IN COMPLINACE with the original or most recent
approved design plans, and the City of Durham's operation and maintenance standards.
Seal/Signature
Digitally signed by Timothy P. — •'�
Inspection by: Timothy P. Grady Grady - * J, 1015
•
Date: 2023.10.13 17:32:16-04'00' 7.
Click area above to attach digital signature ;)•. cn0
Submit By Email Print Form Click above to affix electronic seal
Wet Detention Basin Checklist for Annual SCM Report.Page 7 of 7 Electronic Version 1.0/2013

OPERATIONS AND MAINTENANCE MANUAL
Project: DAVIS PARK EAST
WET POND
STORMWATER CONTROL MEASURE
Location: 310 Keating St, Morrisville, NC
Prepared For: Alta Davis Park Owner, LLC
Derived from the O&M Manual prepared by the
SCM Certifying Engineer (BCE) for Construction Certification
and
Updated By: Timothy P. Grady, RLA
Date: 10/11/2023
Name (Printed): Timothy P. Grady
BMC #: 2007001
NCRLA Seal: ```����u�u�,,,,��'
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OPERATIONS & MAINTENANCE MANUAL
DAVIS PARK EAST WET POND
This manual establishes procedures for maintenance and operation of the (1) Wet Pond
located at Davis Park East in Durham, North Carolina, in accordance with the City of Durham
and State SCM guidelines. Regular maintenance is essential to the long-term performance
and durability of these devices. Wet Ponds require both routine maintenance and major
maintenance/repair over time or as the result of structural failure. Certain timely preventative
maintenance (summarized herein) should lengthen the time period between major
maintenance procedures, maintain compliance with City statutes, and help protect the health,
safety and welfare of the general public. This manual should be retained intact, and be
reviewed in its entirety by all parties responsible for the maintenance of the SCM.
This manual has been created as part of the requirements of the City of Durham's current
SCM Maintenance program. The contents of this manual were specifically derived from
the manual prepared by the SCM Certifying Engineer for Construction Certification
(Exhibit 'A' below). Any updates/additions that may occur over time to the original
information shall be shown in blue ink within this manual. As part of the annual
certification process, the City of Durham requires the preparation of an Operation and
Maintenance Manual. The City views the Operation and Maintenance Manual as a living
document and subject to updates as may be necessary to reflect changes that may occur in
the SCM. It should be noted that G2 Design is not the engineer of record and did not design
the SCM system, or any portion of the subject property. This O&M Manual summarizes to the
best practical extent Operation and Maintenance guidelines based on both field observations
of the constructed SCM, and City and State maintenance guidelines for similar devices, and
should serve as a minimum performance standard.
Maintenance, repair and related reporting requirements shall be implemented as required
under the current guidelines of the SCM Annual Maintenance Certification Protocol. Details
are available under the City of Durham Public Works Department Stormwater Services
Division website, currently found at:
https://www.durhamnc.gov/695/SCM-As-Built-BMC-Maintenance-Programs
Operations and Maintenance Manual Guidelines
This manual should not be used as a replacement for the SCM Maintenance Certifier's
(or "BMC') evaluation of the facility's condition. (A "BMC" is an engineer or landscape
architect who has been certified by the City of Durham to perform SCM inspections)
Rather, this manual is to be used during cursory, routine inspections of the facility. Actual
determinations as to the need for repair and the actual repair to be conducted are to be
determined by a certified and licensed professional qualified for the type of work involved.
Per City of Durham requirements, an annual inspection is to be performed by a BMC in
addition to routine inspections and maintenance of the facility performed by the Owner
and/or their maintenance contractor.

Davis Park East Stormwater Wet Detention Basin #1
City of Durham, North Carolina
Operation and Maintenance Manual for Stormwater Management
Facility #1
Date of Manual: August 12, 2020
Name of Author: Z. Nathan Bales, PE
Access
Unimpeded vehicular access to the facility should be aggressively maintained. The
access to the facility should be kept free of structures, utility boxes/pedestals, and
any vegetation other than grass. The normal pool must be drained in order to
traverse the access the forebay by opening the drawdown drain on the riser
structure.
Dam Embankment
The entire dam should be mowed regularly, with a minimum grass height of 6-
inches, and kept free of all woody vegetation. Any bare areas should be raked,
amended, seeded, and mulched as soon as practicable. The best times to complete
such work are in the early fall and early spring.
Riser Structure
The riser structure (including the top and side trash racks) should be kept free of
sediment, debris, and trash, and all vegetation (except grass) should be cleared
from within five feet of the structure. If questions arise regarding the maintenance
of this structure or if it appears that the normal pool is higher than it should be, the
owner should contact me as soon as possible. To aid in this regard, my contact
information is provided at the end of this document.
Low Flow Drawdown Pipe
The Low Flow Drawdown Pipe (LFDP) should be kept free of sediment, debris,
and trash. Special attention is directed to the connection of the LFDP to the Riser

Structure. If cave-ins appear behind the riser structure, the owner should contact
me as soon as possible as the presence of such a condition may be indicative of
some form of piping failure, which can significantly threaten the viability of the
dam, the function of the LFDP, and the overall function of the wet detention basin
system.
Principal Spillway Pipe (PSP)
The PSP should be kept free of sediment, debris, and trash. Special attention is
directed to the constructed earthen weir to ensure that the compacted areas around
the weir are not eroded and that the final vegetation stays secure and healthy.
During the annual inspection, check for erosion at the downstream toe to ensure
that there is no erosion between the armor and the existing ground. Also, check for
and remove any tree seedlings that may sprout on or around the PSP.
Outfall
The outfall area should be kept free of excess sediment and overgrown vegetation.
Forebay
The wet detention basin forebay should be kept free of sediment, debris, and trash.
Any erosion in the forebay, such as damage to the forebay berm or displacement of
the inlet rip rap dissipator pad, should be noted during inspection. Special attention
is directed to the amount of sediment accumulation in the Forebay. The Forebay
shall never have more than 1-foot of accumulated sediment. A potential method to
check for sediment accumulation is that at normal water level, the water depth in
the forebay shall never be less than 5-feet.
Cut slopes (these are the pond side slopes not associated with the dam)
Except for the areas over the inlet pipes, it is recommended that a majority of the
cut slopes, remain un-mowed and allowed to revert to a natural state. Any eroded
or bare areas should be repaired, raked, amended, seeded, and mulched as
necessary. The best times to complete such work are in the early fall and early
spring.
Principal Inlets

The inlet areas should be monitored for excessive sediment buildup. If excessive
sediment is encountered, the owner should contact the John R. McAdams
Company as there may be an erosive condition upstream of the facility
contributing to the sedimentation.
Impoundment Area
The impoundment is that of a stormwater wet detention basin. Each year, any
unhealthy (severely distressed) or dead plants should be removed and replaced as
soon as possible. Establishing and maintaining a healthy wet detention basin plant
population in the planting areas is recommended. Care should be taken to ensure
algae does not build up in the impoundment area. Excess accumulation of sediment
should be removed.
Vegetated Shelf
Any cattails that take hold along the shoreline should be managed aggressively.
With respect to invasives management, please be aware that the City of Durham
has a strict policy concerning the use of herbicides in aquatic environments.
Routine Inspections
According to the North Carolina BMP Manual, the wet detention basin should be
inspected at least once a month and within 24 hours following any storm event
producing at least one inch of rainfall.
Annual Certification
The annual anniversary month for the wet detention basin will be the month in
which the city accepts the certification. As such, the pond must be certified by a
BMC (BMP Maintenance Certifier) on or before the end of the accepted month
every year.
Maintenance Records
Routine maintenance records should be kept in a central place and readily available
should the City of Durham request such information.
Author Contact Information
Z. Nathan Bales, PE

McAdams
2905 Meridian Parkway
Durham,NC 27713
Main Phone: [phone]
E-mail: [e-mail]

2023 Annual Inspection - Minor Issues to be Corrected In Coming Year
TO AVOID FAILURE for 2024 Annual Inspection at Wet Pond
(Contractor to take and send photos to [e-mail] upon completion of remediation)
1. Refresh existing mulch coverage and expand to stabilize bare area at southern portion of west side
of SCM at top of retaining wall. Pine straw or shredded hardwood mulch may be utilized (shredded
mulch will improve soil conditions and make viable for future vegetative establishment from seed).
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2. Cut herbaceous overgrowth for entirety of dam downslope. Rake and remove clippings to prevent
smother of well-established turf cover.
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3. Seal upstream joint in the outlet discharge pipe shown in photo below with non-shrink hydraulic grout
to stop seepage. Perform same task at each successional joint downstream of subject joint, where
joint(s)may be presenting with bypass flow.
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MISCELLANEOUS ITEMS TO BE MONITORED at Wet Pond
1. The northern berm appears to have been seeded with tall fescue rather than sodded with Bermuda
like other slopes. Establishment is sparse in some portions, but currently sufficient to stabilize top
and inner slope. However, remediation will be required if further infill does not occur. It is
recommended to implement the following during the 2024 growing season: aerovate to decompact,
supplement with lime & fertilizer, and overseed at optimal time for the turf-type seeding implemented.
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