20051690 Ver 1_Erosion Evaluation_20070403

`lk, pNC Division of Water Quality
401 Oversight and Express Permitting Unit
Memorandum
To: John Dorney
From: Eric Kulz
Subject: DWQ # 20051690
April 3, 2007
Post-Storm Erosion Inspections - Deep Creek/Carbonton Dam Removal Project
Reports prepared by EcoScience Corporation for Restoration Systems, LLC
John:
We have received erosion reports for from four monitoring dates in 2006. The monitoring dates
are as follows:
Erosion Evaluation No. 1 - 5/1/06 - 5/2/06
Erosion Evaluation No. 2 - 6/26/06 - 6/27/06
Erosion Evaluation No. 3 - 11/27/09 & 11/29/09
Erosion Evaluation No. 4 - 12/28/06 & 1/4/07
Observations were made from canoe at 19 locations on the main stem of the Deep River, mostly
at the confluence points of tributaries, as well as four land observation points (on tributaries from
bridges).
Of the 19 river observation points, 18 showed at least some level of erosion, scouring or bank
failure. The majority of the tributaries exhibited head cutting, bank erosion/mass wasting, and
sediment loss to the Deep River.
I attempted to summarize the results in tabular form to try to derive some quantitative and
progressive information regarding the conditions observed, but the locations of some of the points
changed and were re-numbered. However, progression of instability and headcutting appeared
to be occurring. No attempts to actually measure/quantify the amount of erosion were presented
in the reports. Installation of rebar markers or other methods of measuring channel movement or
incision appear warranted.
Photographs are included in the reports.
The bridge observation sites showed some minor erosion/undercutting of banks, but nothing like
the areas near the confluences.
Randy Turner's august 3, 2007 transmittal letter stated that the reports were "consistently
confirming stability"; I would question that statement based on the reports.
North Carolina Division of Water Quality; 401 Oversight and Express Permitting Unit
1650 Mail Service Center; Raleigh, NC 27699-1650
2321 Crabtree Blvd., Raleigh, NC 27604-2260
Telephone: [phone]; Fax: [phone]
http://ncwaterquality.org/wetlands