20001449 Ver 1_More Info Letter_20070226

~QF W A T~~,Q Michael F. Easley, Governor
~Q G William G. Ross Jr., Secretary
Vj ~- North Carolina Department of Environment and Natural Resources
~ ^~ .~~ -~ ?'"• ~ Alan W. Klimek, P.E. Director
~ ,
- Division of Water Quality
February 26, 2007
DWQ Project # 00-1449
Gaston County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. Bob Dienst
Dienst Enterprises
125 Easton Drive
Mooresville, NC 28117
Subject Property: Catawba Hills Subdivision, Village D - Townhomes
REQUEST FOR MORE INFORMATION
Dear Mr. Dienst:
On Apri18, 2003, the Division of Water Quality (DWQ) issued a 401 Water Quality Certification to
impact to impact 0.18 acre of wetland and 600 linear feet of stream or waters for the purpose of
constructing a residential subdivision you described in your application dated November 17, 2000. In
order to meet Condition 4 of the 401 Certification for this project, a revised stormwater management plan
was submitted to the DWQ on November 15, 2006. The DWQ has determined that your stormwater
management plan was incomplete as discussed below.
Additional Information Requested:
1. Please redesign Extended Detention Wetland #1 so that all stormwater runoff is directed to a single
forebay. Also, please place the inlet and outlet pipes as far apart as possible to maximize the flow
path and improve the wetland's pollutant removal capability.
2. Please redesign Extended Detention Wetland #2 to maximize the flow path between the inlet and
outlet pipes.
3. Please include a separate extended detention wetland worksheet for each of the proposed
constructed wetlands. Currently, the submittal only includes one worksheet and it is for a wet
detention basin, not an extended detention wetland. The extended detention wetland worksheet is
available on our web site at: http•//h2o enr state nc.us/ncwetlands/wetlndwk.pdf.
4. Please provide all information requested in the extended detention wetland worksheets, including a
planting plan with plant species and densities and nursery and soil specifications.
5. Please provide all the information requested in the bioretention worksheet, including: soil
specifications, aprofile of the soil layers and underdrain system, a planting plan with plant species
and densities, and plan details for the inlet and outlet structures.
6. Please provide plan details for the level spreader. The DWQ highly recommends that the level
spreader include a concrete lip to avoid failures and maintenance problems in the future.
N~o~thCarolina
401 Oversight/Express Review Permitting Unit Q~LICQ~~If
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] /Internet: htthr'!h2~i_enrstate,ilc.uslncwetlan3s
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper

Mr. B.ob Dienst
Page 2 of 2
February 26, 2007
The DWQ will require the above additional information to finalize review of the stormwater management
plan for the subject property. Please provide the following information so that we may continue to review
your project. You are welcome to contact me at 919-715-3425 if you have questions or would like to set
up a meeting.
Sincerely,
Annette Lucas, Environmental Engineer III
401 Oversight/Express Review Permitting Unit
AML/aml
cc: USACE Asheville Regulatory Field Office
Mooresville DWQ Regional Office
File Copy
Central Files
Julie Roberts, Land Design, 223 N. Graham St., Charlotte, NC 28202
Len Ridner, 3714 Spokeshave Lane, Matthews, NC 28105
Filename: 001449CatawbaHillsSub(Gaston)_Hold_S W