HomeMy WebLinkAbout20050893 Ver 1_More Info Received_20081229
December 23, 2008
Alan Johnson
Env. Sr. Specialist
NCDWQ - Mooresville Regional Office
610 East Center Ave., Suite 301
Mooresville, NC 28115
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DEe 2 9 2008
DEHA - WATER'QUAUTY
WETLANOSANO STORMWAlER BlWQt
Re: Davie Park Stream Restoration
DWQ # 05-0893; USACE Action ID. No. 200531884
Mecklenburg County
DearMr. Johnson:
On behalf of Mecklenburg County, HDR Engineering, Inc. of the Carolinas, (HDR) is
pleased to provide further information regarding the Davie Park Stream Restoration Plan
(Plan). We appreciate the Division's review of the Plan and the comments received on
December 18, 2008. Please find below responses to the five requests for information (in
bold) contained in your response letter.
· Figure 14 was omitted from the submitted plan. Please submit a copy of
this figure. We apologize - Figure 14 is enclosed for your review/use.
· No planting plan or plant list was submitted with the plan. Please provide a
list of the proposed planting. No single species should exceed 20% of the
total required plants. A proposed plant list was provided for your review/use
in Table 4 of the plan. Please keep in mind though that this list is proposed and
will depend on the availability of species at the time of construction; percentages
will be adjusted accordingly. ..
· Are seals required above and below the proposed constructed riffles? It is
our opinion that this removes some of the natural stream dynamics from the
system. Rock sills are provided at the upper and lower ends of riffles to provide
the extra protection needed to stabilize the new stream bed and stream profile
above the incohesive fill placed into the old incised channel bottom. Originally
the stream would have run on semi-cohesive saprolite and/or bedrock, and rock
sills represent the best approach available to simulate that original environment
in this restoration and provide the necessary assurances for success.
· There is concern that in those instances where the stream is being
constructed in the old streambed,' the use of geotextile material may
interfere with the hyporheic zone. Geotextiles are to be selected with higher K
values than underlying or overlying fills such that they do. not pose a rate
determining factor for hyporheic flow.
· An aquatic survey should be conducted of the existing stream channel prior
to initiation of the restoration project and be included in the monitoring
program. HDR will perform a Qual-4 macro invertebrate survey and sample for
HDR Engineering,lnc. of the Carolinas
128 S Tryon Street
Suite 1400
Charlotte. NC 28202'5004
Phone: (7041338-6700
Fax: 1704) 338-6760
www.hdrinc.com
. fishes prior to the construction of the project. Baseline data and subsequent
survey information will be included as part of the report component .of the.
monitoring program.
We hope that the inforrimtion attached with this lett€I:' and included above is adequat~ in
addressing your .comments/questions/concerns. If you have any other need for
infortnation, feel free to contact me at 704-338-6778.
Respectfully submitted,
Chris Matthews
Sr~ Project Manager
Enclosures
cc:. Amber Lindon - Mecklenburg County. '.
U.S. Army Corps of Engineers - Asheville Regulatory Field Office
Eric Kulz -'- NCDWQ Wetlands Unit- Raleigh.
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