20121146 Ver 1_Monitoring Report_20230302

/ / Charlotte -Mecklenburg
/ d STORM
WATER
Services
March 2, 2023
StormWater.CharMeck.org
Samantha Dailey
Chief, Charlotte Regulatory Field Office
U.S. Army Corps of Engineers, Wilmington District
8430 University Executive Park Drive, Suite 615
Charlotte, NC 28262
600 East 4th Street
Charlotte, NC 28202
Re: Post -construction Year 5 Monitoring Report/ Project Close-out Request
Parkwood SDIP (SAW- 2012-01562)
Hydrologic Unit Code 03050103
Charlotte, Mecklenburg County, North Carolina
Dear Ms. Dailey
City of Charlotte Storm Water Services (CSWS) is hereby submitting the Year 5 post -construction
monitoring report for the Parkwood Storm Drainage Improvement Project (SDIP). This project
includes 810 linear feet of stream enhancement or relocation proposed to mitigate for on -site
impacts to Water of the United States.
Project History
The Parkwood SDIP was authorized by Department of the Army Individual Permit # 2012-01562
(DWR #12-1146) and completed construction in winter 2018. Per the 2013 approved Stream
Enhancement Monitoring Plan, CSWS was required to provide the regulatory agencies with as -
built documentation and 5 years of post -construction monitoring data which includes vegetation
survival monitoring, photo documentation, BEHI analysis, during two bankful events per each
monitoring year. Monitoring activities have been completed according to the table below.
Monitoring Activity
Completion Date
As -built Documentation
Spring 2018
Monitoring Year 1
Summer 2018
Monitoring Year 2
Summer 2019
Monitoring Year 3
Summer 2020
Monitoring Year 4
Summer 2021
Monitoring Year 5
Summer 2022
As required, two bankful events were documented on Aug 11, 2018, and September 16, 2020.
Year 5 Summary
Based on the Year 5 report prepared by Mecklenburg County, CSWS has predominately been
successful meeting the goals of the approved Stream Enhancement Monitoring Plan. In the one
section of Reach 2 where there is some instability, there are plans for repair.
cQh CITY of CHARLOTTE

Samantha Dailey
March 2, 2023
Page 2
For channel stability, Reach 1 had an average BEHI score of "moderate". "Overall channel
conditions (i.e., channel shape and bedform) were determined to be stable and not trending
towards unstable conditions." For Reach 2, the average BEHI score was also "moderate",
although "valley confinement and presence of bedrock has accelerated channel widening" and
increased the BEHI score. This is the area where repairs are planned.
Vegetation Surveys showed planted vegetation is performing relatively well, as evidenced by the
overall stem survivorship and strong establishment of warm season grasses and herbaceous
ground cover. VP 1 was slightly below survival rate, but surveys showed that, overall, the project
has a strong establishment of riparian vegetation.
Visual Assessments, in the form of yearly PRL photographs, also document stable vegetated
streambanks and heavy herbaceous understory growth throughout the buffers
To address the only area of instability in the upstream portion of Reach 2, CSWS is planning to
grade bankful benches and replant. On October 10, 2021, CSWS met with the USACE and
NCDWR representatives to obtain input into repairs for this area and guidance for permitting the
repairs. Representatives agreed with the repairs proposed and instructed CSWS to permit these
repairs through Regional General Permit 163. Repair plans are currently at 100% design and
should be constructed within a year. The Year 5 Report did not identify any other areas of
concern for Reach 1 or Reach 2.
The 401/404 Permitting Group is submitting this final report to close out the mitigation
requirement for the Parkwood SPID project. Your review and comment on this report is
welcome. Please feel free to contact me with any questions of concerns at [phone] or
[e-mail]
Sincerely,
A,4..g.kf. 0 'A.4,
Kristen O'Reilly
401/404 Permitting Supervisor
City of Charlotte Storm Water Services
Encl: Parkwood SDIP Year 4 Post -Construction Monitoring Report
cc: Andrew Pitner, NCDWR
Megan Jolly, USACE