20060447 Ver 3_HLE18020-Relocation Monitoring Plan_20200518

MONITORING PLAN > OLDE TOWNE
2905 Meridian Parkway, Durham, NC 27713 / 919. 361. 5000 creating experiences through experience
MONITORING PLAN
The monitoring plan to evaluate the success of the Site is generally based the U.S. Army Corps of Engineers (USACE)
Stream Mitigation Guidelines (2016) and the North Carolina Ecosystem Enhancement Program (NCEEP) Monitoring
Requirements and Performance Standards for Stream and/or Wetland Mitigation (November, 2011). Monitoring of the
Site will occur for three (3) full years. A monitoring report will be generated for each monitoring year documenting the
activities at the Site.

STREAM MONITORING
Stream geometry will be considered successful if the geometry, profile, and sinuosity are stable or reach a dynamic
equilibrium. It is expected that there will be minimal changes in the designed cross sections, profile, and/o r substrate
composition. Changes that may occur during the monitoring period will be evaluated to determine if they represent a
movement toward a more unstable condition (e.g. down cutting, or bank erosion) or are minor changes that represent
an increase in stability (e.g. settling, vegetative changes, etc.). Deviation from the design ratios will not necessarily
denote failure as it is possible to maintain stability and not stay within the design geometry .

BANKFULL EVENTS
The occurrence of bankfull events within the monitoring period will be documented using a crest gage and photographs.
A crest gage will be installed which will record the highest watermark between site visits . The crest gage will be checked
each time there is a site visit to determine if a bankfull event has occurred. Photographs will be used to document the
occurrences of debris lines and sediment deposition on the floodplain during monitoring site visits .

CROSS SECTIONS
A total of two (2) cross sections will be installed after construction of the Site and will be surveyed as part of the As-
built survey, one (1) year after construction, and then three (3) years after construction. Each cross section will be
marked on both banks with permanent pins/monuments to establish the exac t transect used. A common benchmark
will be used for the cross sections and it will be consistently used to facilitate easy comparison of year to year data . The
cross-section survey will include points measured at all breaks in slope, including top of bank , bankfull, inner berm, edge
of water, and thalweg, if the features are present. There will be one (1) riffle cross section and one (1) pool cross section.
Photographs shall be taken at each cross section with photographs looking up and downstream and one photograph
facing each bank.

VISUAL MONITORING
Visual monitoring shall take place along the entire stream reach twice annually during the monitoring period to
document any lateral movement, structure failure, aggradation/degradation, invasive species, headcuts, or beaver
activity. Visual monitoring will also be required in the buffer to document any excessive mortality, low stem density,
encroachments, or invasive species.

SUCCESS CRITERIA
Success criteria will determine if the project is meeting its prescribed goals for the project. A determination will be
made regarding the success of the project following the collection and evaluation of ecological and physical monitoring
data, photographs, site observations, and the performance of the streams during storm events. Monitoring components
that will be evaluated include vegetation survival, channel bed and bank stability, and in -stream structure performance.

MONITORING PLAN > OLDE TOWNE
creating experiences through experience 2 of 2
STREAM SUCCESS CRITERIA
Channel stability will be reflected in the surveyed permanent cross sections, evaluation of bank stability and cover,
evaluation of in-stream structure performance and any previously collected monitoring data . The general trend should
reflect a stable or slightly decreasing riffle cross sectional area whereas pools may increase and yet be considered
relatively stable. Normally the constructed channel will adjust (especially in a sand dominated bed) but it will need to
function without significant degradation (bed sco ur), aggradation (mid-channel bars), or bank erosion.

The Bank Height Ratio (BHR) as determined by cross section surveys, shall not exceed 1.2 and the Entrenchment Ratio
shall be no less than 2.2 within the restored reach. The stream shall remain stable over the three-year monitoring period
as indicated by visual surveys and cross sections.

VEGETATIVE SUCCESS CRITERIA
Vegetative success criteria will be based on the visual monitoring conducted twice annually. If there are no significant
bare areas or areas of dead vegetation at the end of the monitoring period, the project will be considered successful. If
any bare areas or areas of dead vegetation are noted during any of the visual inspections, they will be addressed with
supplemental seeding at that time.