20072046 Ver 1_More Info Received_20081009

A!?LMG
LAND MANAGEMENT GROUP INC.
Environmental Consultants
08- t asq
October 6, 2008
Mr. Chad Coburn
DWQ/DNER
27 Cardinal Drive Extension
Wilmington, NC 28405
Voice: 910-796-7379
Re: Brunswick Forest Phase 3 Golf Course Amenity Ponds.
Chad,
Attached is a report describing the potential impacts the proposed amenity ponds/
sediment basins may have on the nearest wetland systems. We have documented the
vertical separation between the wetlands soil surface and the proposed elevation of the
amenity pond. Using the horizontal distance as a secondary input to standard drainage
equations we have run each scenario to decide if there is a need for corrective
measures. Our report finds that no further measures are needed for the ponds as
shown. Please contact me if you have questions. We can examine some of these
features on our site visit.
T arc you,,_-,
Craig TGrner
Vice President
Land Management Group, Inc.
P.O. Box 2522
Wilmington, NC 28403
910-452-0001 Voice
910-452-0020 Fax
cturner(cDlmgroup. net
Cc: D. Brown
1. McMillan
?AIC r
A
Q??Rae?09
ICT 9 2008
WETLANDS AND STORMWATER BRANCH
A!?LMG
LAND MANAGEMENT GROUP INC.
Environmental Consultants
This report summarizes the impacts the proposed amenity ponds/sediment basins in Phase 3
have on the nearby wetlands. My comments are based upon the design sheets provided by
Hanover Design Services for each structure. Site-specific soils data has been collected and
augmented by data collected and used in previous evaluations.
The following table is shown for the distance from the edge of the wetlands to the closest point
of the edge of the permanent pool. The closest distance to the wetland, PP elevation and the
elevation of the wetland ground surface are noted in the following table. For strongly sloping
sites, wetlands, at or below the PP elevation will not be impacted by the sediment basin. For
vertical separations of greater than two feet between PP and 404 elevations, for distances less
Brunswick Forest Sediment Basin Pond Projected Impact on Groundwater

Golf
Course
S-
BASIN Closest
Distance
to
wetlands PP
Elev.
(msl) 404
Elevation
(msl)
Corrective Measure Needed
C 1C-1 14.0 15.0 15.8 ` none
1 C-2 345 22 19.9 none
2C-1 23.7 23.0 25.0 none
2C-2 10.0 23.0 25.0 none
2C-3 56.7 21.0 21.0 none
2C-4 290.0 22.0 24.5 none
4C 386.0 20.5 none
5c-1 88.2 20.0 22.0 none
7C 114.4 11.0 10.0 none
8C-1 37.9 11.0 13.0 none
8C-2 >300 18.0 18.0 none
9C 41.1 16.0 15.3 none
M 1 M 62.8 15.0 15.2 none
2M-1 242.7 22.0 24.8 none
21VI-2 358.8 22.1 25.0 none
3M-1 372.2 21.7 24.3 none
3M-2 38.1 21.0 23.0 none
4M 87.0 21.5 23.5 none
51VI-1 71.4 26.5 28.4 none
5M-2 39.4 26.5 28.5 none
6M 51.8 26.5 28.0 none
81VI-1 82.5 23.0 25.0 none
8M-2 647.8 23.0 17,5 none
9M 173.5 18.5 17.0 none
than 50 feet, we have recommended design constraints to minimize lateral water movement into
the ponds.
Soil borings taken at each site evaluated certain morphological properties and estimated
permeability as described in Standard Methods of Soil Analysis, Part 1, 1972 and Field Guide
for Describing and Sampling Soil, 1998. Soil profile data for each boring is not included in this
report. No proposed corrective measures are required to minimize lateral water flow into the
proposed amenity ponds/sediment basin structures. Please feel free to contact me if you have
questions or comments about this information
Respectfully,
G. Craig Turner
Vice President
Land Management Group, Inc .NC
Licensed Soil Scientist # 1091
SC Certified Soil Scientist # 57
October 6, 2008
www.lmgroup.net • infoglmgroup.net • Phone: [phone] • Fax: [phone]
3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403 • P.O. Box 2522, Wilmington, NC 28402
S.C Certification
Number 57

4 V ? i
9
i ?
F I
j ?
L?
1i
-? y
jr
5

? Na
o ?m
? m.

cz? en,

Sy 9

c?

s