19990231 Ver 1_Mitigation Information_20080603

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Clearwater Environmental Consultants, Inc.
To: David Lekson
From: Clement Riddle
Date: June 3, 2008
Subject: Revision to the Annual Mitigation Report For 2007 7-Acre Wetland Creation
As discussed on May 28, 2008 between Terry Hairston, Nucor and David Lekson,
USACE, Clearwater Environmental Consultants is providing the following information to
address two statements within the Annual Mitigation Report For 2007 7-Acre Wetland
Creation.
1) Below is a revised Table 1 to be included with the "Annual Mitigation Report For
2007 7-Acre Wetland Creation" for the 7-acre created wetland at the Nucor Plate Mill.
The original table 1, page 13, incorrectly state the success dates.
Table 1 Hydrologic Monitoring 7-Acre Creation Area 2007
Permit Success Criteria
Monitoring
Gauge <5%

(<11 days) 5-8%
(11-18
days)
8-
(19-28 8 days)
> 12.5%
(> 28 days) Actual Number of
Consecutive Days
(Percent)
Success Dates
GW1 • 28% (62 days) Mar. 28 - May 29
GW2 • 28% (62 days) Mar. 28 - May 29
GW3 • 16% (35 days) Mar. 28 - May 2
GW4 • 39% (87 days) Mar. 28 - Jun. 23
GW5 • 28% (63 days) Mar. 28 - May 30
RW1 • 26% (58 days) Mar. 28 - May 25
2) Section 6.4 Created Wetland Vegetation Conclusions states that, there was an increase
from 830 trees in 2006 to 925 trees in 2007. Most of this increase is the result of multiple
stems sprouting from the planted Nyssa aquatica. Following review by the USACE,
Clearwater Environmental will record future tree counts so that multiple stems count as
one plant instead of counting individual stems.