20190210 Ver 2_A-11_stream monitoring plan for sites 10-12, 15, 17_20201113

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A-11 Stream Relocation Monitoring Plan Ver.
1.0

Sites 10, 11, 12, 15, 17
A-11 Stream Relocation Monitoring Plan
UT to Blair Creek
Clay County
Version 1.0
February 14, 2019

NCDOT Division 14

This plan addresses requirements for the relocation of five reaches on unnamed tributaries to
Blair Creek impacted for construction of the A-11 Improvement Project in Clay County, NC (TIP
A-11). These reaches scored LOW by NCSAM. A separate monitoring plan has been prepared
for the Site 5 channel relocation.

Being in roadside ditches or adjacent to maintained roadway, most of the stream channel lengths
to be relocated are unstable and/or incised or hardened with rip rap. Also, buffers on the existing
channels are absent or limited in extent (woody buffers generally <10’ width and only exist on the
site 17 reach) because of the adjoining road and because there are either maintained yards or
agricultural fields on the opposing sides. Portions of these channel were relocated previously for
improvements to NC 69 in the early 1990’s.

The design of the new stream channels, with exception of Site 12 (through Cherry Farm Historic
Property), includes rip rap lining along the channel margins and in the channels where hydraulic
analyses dictated it. Where rip rap is used in the relocated channels, contractors will be instructed
to embed the rock into the channel bottom with heavy equipment to “choke-out” the large inter-
rock spaces and expedite bedload “naturalization”.

NCDOT will be responsible for implementing the monitoring plan, data collection, and report writing.

GENERAL MONITORING PLAN
Monitoring data collected at the Sites will include reference photos facing upstream from the
downstream end of each relocation reach. Stream morphology is proposed to be visually
monitored annually for a period of five years. The results of visual monitoring will be reported
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A-11 Stream Relocation Monitoring Plan Ver.
1.0

in all monitoring reports. Monitoring will be conducted by NCDOT or its duly authorized
representatives. Monitoring reports of the data collected will be submitted to USACE annually,
no later than April 1 of the year following the monitoring year.

VISUAL MONITORING
As noted previously, the Sites will be visually monitored annually to identify problems with
results documented (photo) and recommended courses of action identified for approval by
USACE.

REMEDIAL ACTIONS
Monitoring reports will address remedial actions. However, identified needs for remedial action
will be communicated as soon as possible after identification to USACE.