20071194 Ver 2_Stormwater Info_20080513

LandDesign..
urban design planning civil engineering branding landscape architecture
May 8, 2008
Ms. Annette Lucas, Environmental Engineer III
Division of Water Quality
401 Oversight/ Express Review Permitting Unit
1650 Mail Service Center
Raleigh, NC 27604
RE: The Birches at Wildcat Cliffs
Request for More Information dated May 1, 2008
DWQ Project #07-1194v2
LDI Project No.: 6007075
Dear Ms. Lucas,
Enclosed is a response to the comments listed in the Request for More Information dated May 1,
2008 in reference to culvert extension and proposed residential development. We have made all
necessary revisions which are addressed in the following enclosed documents:
• Five copies of plan sheets D1.5 & D1.6 last revised May 7, 2008
• Five copies of an explanatory letter from the soil scientist that performed the
investigation, Steve Melin, LSS
• One copies of a Request for More Information, dated May 1, 2008 & addressed
to Mr. Bill Nellis
The Response to Comments below details how each of the two (2) comments in the Request for
More Information has been addressed (the original Request for More Information May 1, 2008
has been enclosed for reference).
Response to Comments:
1: See attached letter from soil scientist, Steve Melin, LSS. Mr. Melin believes that the
infiltration capacity at all five infiltration basin locations is sufficient at the design rate of
0.52 inches per hour.
2. The details on sheets D1.5 & D1.6 have been revised to show the cut slopes upslope of
the infiltration basins at a 3:1 maximum slope. Please note, the revised sheets were
numbered D1.1 & D1.2 on the set previously submitted. The stormwater plans have been
combined with the erosion control plans, which is why the sheet numbers have changed.
Grove Arcade Building K!
One Page Avenue, Suite 220 MAY 1 3 2008
Asheville, NC 28801
DENR - WP7ER CIi
V: 828.281.1447 WETLANDS AND STORMWATER BRANCH
F 828.281.1449
www.LandDesign.com G:\_2007\6007075\Docs\Correspondence\DWQ\7075-Response to DWQ Request for Information (2) doc
Washington DC
Charlotte NC
Pinehurst NC
Asheville NC
Tampa FL
Nashvi I le TN
Beijing PRC
Should you have any questions or need any additional information please call.
Respectfully Submitted,
LANDDESIGN, INC.
Greg Hoffman, El
Enclosure:
cc: Mr. Bill Nellis, Wildcat Cliffs Country Club, Inc.
File 6007075
Washington DC
Charlotte NC
Pinehurst NC
Asheville NC
Tampa FL
Nashville TN
G1_2007\6007075\Docs\Correspondence\DWQ\7075-Response to DWQ Request for Information (2).doc Beijing PRC
TRANSMITTAL
Grove Arcade Building, One Page Avenue, Suite 220, Asheville, NC 28801
V: 828.281.1447 F: 828.281.1449
DATE: 5/9/2008
PROJECT NAME: 6007075 ON SITE WILDCAT CLIFFS
TO: Annette Lucas PROJECT #: 6007075
Division of Water Quality
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center
Raleigh, NC 27604
[e-mail]
FROM: Hudson Owen
LandDesign
[e-mail]
cc
WE ARE SENDING: Response to Comments Submittal
VIA: Second Day
PURPOSE: For your use
Quantity Dated Description
1 5/8/2008 Response to Comments Letter
1 5/1/2008 Request for Additional Information Letter
5 5/6/2008 Mountain Soils, Inc. Response to Comments Letter
5 5/7/2008 Full Size copies of Revised D1.5 & D1.6 Sheets
NOTES
If this document was delivered via FAX, the accompanying transmission contains confidential information intended only for the use of the individual of the entity named above. It you are not the intended recipient, you are
hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this facsimile information is strictly prohibited. If you have received this FAX in error, please immediately notify
us by telephone to arrange for disposition or return of the documents to us.
Asheville NC
Washington DC Tampa FL Asheville NC Pinehurst NC Charlotte NC Nashville TN Beijing PRC
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MAY 1 3 2OGt=i
UENR - WATER QUALM
"RANDS AIYD STQRMWAJER 8RA;>r
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?OY v + C?jQ micnaei r. rasiey, governor
William G. Ross Jr., Secretary
LLL. _7?? ?U North Carolina Department of Environment and Natural Resources
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Q C MAY 1 3 2008 Coleen H. Sullins, Director
DENR WATER QUAl Division of Water Quality
? `ay 1, 2008
WETLANDS AND STORMWATER ER BRANrl
DWQ Project # 07-1194v2
Macon County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. Bill Nellis CEC,project # q5O
Wildcat Cliffs Country Club, Inc.
770 Country Club Drive Date Recieved S 5
Highlands, North Carolina 28741
Subject Property: Wildcat Cliffs Country Club
Cullasaja River / Lake Ravenel [040401, 2-21-(0.5), WS-III Tr]
REQUEST FOR MORE INFORMATION: STORMWATER MANAGEMENT PLAN
Dear Mr. Nellis:
On April 10, 2008, the Division of Water Quality (DWQ) issued a 401 Water Quality Certification to
fill 122 linear feet of perennial stream in order to construct the subject development in Macon
County. In order to meet the requirements of General Certification 3705, a stormwater management
plan, dated March 4, 2008 was received by the DWQ on March 5, 2008. The DWQ has determined
that your stormwater management plan was incomplete as discussed below.
Additional Information Requested:
The soils report states that "the presence of rock and high concentrations of subsurface
stoniness was identified. The presence of highly concentrated rock limits the placement
of trenches and adversely affects the movement of water in the subsoil." This statement
leads the DWQ to believe that this site may not be appropriate for infiltration trenches.
Also, it appears that the soil borings in the vicinity of some of the proposed infiltration
basin number were only able to be advanced to less than 36 inches below the surface,
which could indicate the presence of subsurface rock. Please ask your soil scientist to
make a conclusive statement about whether he believes infiltration is possible at all five
of the proposed infiltration basin locations.
2. If the information requested in Item 1 can be provided, then the cut slopes upslope of the
infiltration basins may not exceed 3:1.
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.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: ham:: i'h2u.enrstate.nc.us/newetlands
No One
Carolina
Naturally
An Equal Opportunity/Affirmative Action Employer - 50% Recycled110%Post Consumer Paper
i
07-1194v2 Wildcat Ulitts i ouniry uiuo
May 1, 2008
Page 2 of 2
Sincerely,
Annette Lucas, Environmental Engineer III
401 Oversight/Express Review Permitting Unit
AML/aml
Cc: Army Corps of Engineers, Asheville
Kevin Barnett, DWQ.,:.ARO
Central Files
File Copy
Clement Riddle, CEC, 718 Oakland Street, Hendersonville, NC 28791
Filename: 071194v2BirchesatW ildcatCliffs(Macon)_S W_Hold

M S I
MOUNTAIN SOILS, INC.
71 Ledford Drive
Franklin, Nonk Carolina 28 734
w - 5962 9? a o.,p?? ffi e F
(az8) 524 sa4
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Ms. Annette Lucas
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Re: Wildcat Cliffs Country, Club
DWQ Project # 07-1194v2; Macon County
Dear Ms. Lucas,
This letter is intended to address the additional information requested from a May 1, 2008
letter and to support MSI's (Mountain Soils, Inc.) conclusion that infiltration at all five
infiltration basins is possible at the design rate of 0.52 inches per hour.
The soil materials within the area consist of very deep, well drained, Edneyville soils. Of
the ten auger borings locations, six were able to be advanced to depths greater than 7 to 8
feet (84 - 96 inches) in saprolite with no restrictions.
Saprolite is the name for biogeochemical weathered rock (somewhat similar to soil). It is
mostly soft, friable and commonly retains the structure of the parent rock since it is not
transported, but formed in place. The saprolite encountered at the site was coarse
grained, and friable to very friable. Field measured hydraulic conductivity tests indicate
the saprolite material has a very rapid permeability (in most cases, saprolite at the site
have a more rapid permeability than the actual soil material).
When auger refusal did occur was due to non-contiguous fragmented rock. It was
estimated though auger borings and probing that approximately 10-15% of the subsoil (at
most 25% (conservatively)) consisted of rock material. An additional safety factor
(which is the measured Ksat discounted 25%) was utili7ed in the report to address any
potential influence of rock, although the hydraulic conductivity measurements should
have factored this in the readings.
MS[
MOUNTAIN SOILS, INC.
2
It is our conclusion that the infiltration capacity at all five infiltration basin locations is
sufficient at the design rate of 0.52 inches per hour. Please do not hesitate to contact MSI
if you have any further questions. I hope all is well with you.
Sincerely,

Steve Mclin, LSS
Mountain Soils, Inc
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