20131291 Ver 1_Alternatives Report_20170615

Charlotte Storm Water Services
600 E. Fourth St., 14Floor
th
Charlotte, NC 28202-2844
June 15, 2017
Ms. Crystal Amschler
U.S. Army Corps of Engineers
Asheville Regulatory Field Office
151 Patton Avenue, Room 208
Asheville, North Carolina 28801
Mr. Alan Johnson
NCDepartment of Natural Resources, DWR
Mooresville Regional Office
610 East Center Avenue, Suite 301
Mooresville, North Carolina 28115
Subject:Impacts and Mitigation Revisions
Prosperity Ridge Road ExtensionProject
Charlotte, North Carolina
Dear Ms. Amschlerand Mr. Johnson,
In accordance with our discussion via email onJune 12, 2017, the City of Charlotte(the
City)is submitting this letterto clarify and revise the proposed impacts and mitigation for
the Prosperity Ridge Road Extension project.The twotables included below are from the
revised IP narrative that wassubmitted on January 2, 2014. Table 2 summarizes the
project’s proposed impacts and Table 3 summarizes the project’s proposed mitigation.
Per our discussion, the main adjustment is that an additional 4 linear feet (lf) of pipe
impacts were constructed on the upstream side of Ridge Road.These changes in impacts
are highlightedinthe revised Table 2. The City proposes that these additionalimpacts be
mitigated at a 2:1 ratio,through a payment to the City’s Umbrella Mitigation Bankfor an
additional8 SMUs.
In total, the City proposes to purchase 528credits from the City’s Umbrella Mitigation
Bank(City bank) and 134 stream credits and 0.5 riparian wetland credits from NCEEP.
The mitigation proposal is summarized in Table 3.To date, 520 SMUshave been
purchased from the City bank and 134 SMUs(and 0.5 WMUs) have been purchased from
NCDMS (formerly NCEEP).
This project completed constructionon4/28/2017. With your concurrence on the above
proposal, and payment to the City bank for the additional pipe impacts, it is my
determination that this project is compliant with proposed impacts.Photo-documentation of
compliance will be submittedin conjunction with a revised, signed Mitigation
Responsibility Transfer Form.
To report drainage problems: 704-336-RAINhttp://stormwater.charmeck.org

Charlotte Storm Water Services
600 E. Fourth St., 14Floor
th
Charlotte, NC 28202-2844
Table 2: Summary of Impacts to Jurisdictional Waters of the U.S.
Impacts
Jurisdictional Plan Sheet
Activity
Feature(Location)
PermanentTemporary
Pipe system extension upstream
Stream 1SD-1211LF0
of Ridge Road
Channel relocationupstream of
Stream 1SD-1Ridge Road to facilitate new pipe 85LF0
system alignment
Stream enhancement within
SD-1existing channel to facilitate
Stream 1(Sta. 124+00 –052 LF
transition to relocated channel
124+60)and pipe system (upstream of
Ridge Road)
SD-1Pipe system extension beyond
Stream 1(Sta. 119+85 –existing culvert outlet 39 LF0
120+23)(downstream of Ridge Road)
SD-1
Rip rap stilling basin at pipe
Stream 1(Sta. 119+47 –
38 LF0
system outlet
119+85)
SD-1Stream enhancements and bank
Stream 1(Sta. 119+20 –stabilization downstream of 027 LF
119+47) stilling basin
Wetland 1SD-1Fill0.23 Ac.0
Wetland 2SD-1Fill0.01 Ac.0
Total Impacts for Streams373LF79LF
Total Impacts for Wetlands0.24 Ac.0
Table 3: Summary of Proposed Compensatory Mitigation
Jurisdictional Permanent Mitigation
Mitigation MeasureRatio
FeatureImpactsProvided
Purchase of 442stream mitigation
credits fromthe City’s Umbrella 2:1442LF
289LF–pipe and
Stream Mitigation Bank
Stream 1
fill impacts
In-lieu fee payment to the NCEEP
2:1134LF
for134stream mitigation credits
On-site relocation of 85LF of
85LF
channel
85LF -stream
Stream 12:1
Purchase of 85stream mitigation
relocation impacts
credits from the City’s Umbrella 85LF
Stream Mitigation Bank
Total Stream Mitigation Provided
Total Permanent
373LF(Total of528credits to be debited from City’s 746LF
Stream Impacts
Umbrella Mitigation Bank)
In-lieu fee payment to the NCEEP
Wetlands 1 and 20.24 Ac.for 0.5 acre of riparian wetland 2:10.50Ac.
credits
To report drainage problems: 704-336-RAINhttp://stormwater.charmeck.org

Charlotte Storm Water Services
600 E. Fourth St., 14Floor
th
Charlotte, NC 28202-2844
Please contact Erin Shanaberger at [phone], or [e-mail]
should you have any questions or further comments regarding thisproject. Thank you for
your review and comments.
Sincerely,
Digitally signed by
Erin Shanaberger
Date: 2017.06.15
09:57:25 -04'00'

Erin Shanaberger
Water Quality Program Specialist
City of Charlotte, Storm Water Services
To report drainage problems: 704-336-RAINhttp://stormwater.charmeck.org