20071214 Ver 1_More Info Received_20070821

Environmental Consultants, PA
Road Raleigh, North Cazolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
August 21, 2007
S&EC Project # 9894.W9
DWQ No. # 07-1214
Division of Water Quality - 401 Oversight and Express Review Unit 4 ,.,_. „~ ~.
Attn: Cyndi Karoly/Ian McMillan ^i ~ ~ _. _ °`°'
2321 Crabtree Boulevard a~`
Suite 250
Raleigh, NC 27604
r; ~~ r:= ~ [ 0 i1 r

Re: Reply to the Division of Water Quality's 07/24/07 request for additional information
Belmeade Subdivision
Chatham County, North Carolina
Dear Ms. Karoly and Mr. McMillan:
This letter is in response to your letter dated July 24, 2007, which requested additional
information for the proposed Belmeade Subdivision development. The following restates
your questions/comments and is then followed by our response.
Additional Information Requested
Your submitted geotechnical investigation report for the proposed
bottomless culvert indicates partially weathered rock was encountered
at 3-7 feet in the two borings. Approval of your proposed bottomless
culvert must include submittal of a signed and sealed (by a
Professional Engineer or Professional Geologist) geotechnical
investigation of subsurface soils which directly complies with the
DIVISION OFHIGHWAYS -GUIDELINES FOR DRAINAGE
STUDIES AND HYDRA ULIC DESIGN, PREPARED BYA. L.
HANKINS, JR., P.E. STATE HYDRAULICS ENGINEER -1999.
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]

(http: //www. ncdot. org/doh/PRECONSTR UCT/HIGHWAY/hydro/g1039
9web/pdf/guidelines.pdfl, which states, "When a shallow (3-S foot
max. depth) non-erosive rock foundation is found throughout the
proposed site, the structure can be built on footings without a bottom
allowing retention of the natural channel bed. " The Geotechnical
Unit must confirm the foundation acceptability prior to final selection
of the "bottomless "culvert. Based on your submitted geotechnical
investigation report, a bottomless culvert cannot be approved at your
proposed location. Furthermore, it appears you are proposing to
install a mitered bottomless culvert which is not allowed by the DWQ
(see the first paragraph under WQC 3161 (currently GC 3402),
Conditions of Certification, Streams.)
We do not understand how this comment pertains to the 401 review since there are no
impacts to wetlands or streams within the area you have identified. Recently, it has been
suggested that because current DWQ staff does not have the expertise or qualifications to
review the geotechnical reports that are required as part of a complete application
package, staff within NC DOT has been reviewing the geotechnical reports. We wish to
know whom at NC DOT has reviewed this design so that we may direct our engineer to
contact them directly to review the design proposed at this location.
Your above comment also suggests that in order for the proposed bottomless culvert to be
allowable, it must conform with NCDOT minimum design standards. As this project is
not an NC DOT project, it does not receive any Federal or State funds for construction or
maintenance and therefore, does not need to adhere to the NC DOT design standards.
We have been informed by the project engineers that bottomless culverts have been
successfully located on a number of projects where non erosive partially weather rock
(PWR) has been located deeper than 3-5 feet utilizing strip footings. Please see the
attached letter from Mr. David L. Israel, P.E. which expounds on this point in further
detail.
Finally, the plan view and profile view of the bottomless culvert crossing in the initial
submittal of the application package clearly demonstrates that this culvert is not mitered,
as there are no bends in the culvert design. The project engineers understand that their
proposed design can not result in any direct impacts to the regulated waters. They also
understand that it can not result in any indirect impacts such as destabilizing the stream.
It is not anticipated given the relatively narrow length of the culvert (~ 50 feet) and height
above the stream (7-9 feet) that there will be any indirect impacts. Additionally, the
project engineers are aware that the USACE will require the stream bank to be stabilized
in the area of the bottomless culvert in order to prevent any indirect impacts to the
stream.

2. Are the proposed anti-seep collars shown on the plans for the
proposed bottomless culvert to be placed in bedrock?
No, partially weathered rock.
We assume that there are no other outstanding questions with regards to the issuance of
the requested 401 since no further information was requested. We are therefore
respectfully requesting that DWQ issue a 401 Approval for the Belmeade Subdivision
development.
Please call if you have any questions or require further explanation.
Sincerely,
~~ , -+°
Sean Clark Nicole J. Tho son
Program Manager
Regulatory Specialist
Attachments: 5 copies of Response letter
5 copies of Explanation letter from GeoTechnologies, Inc.
5 copies of "Road Crossing Plan" from initial application submittal
5 copies of "Crossing #8 Bottomless Culvert crossing Profile" from initial application submittal
CC: Mr. Monte Matthews (USAGE)
Mr. Steven O'Neal, Belmeade Farms, LLC, 6208 Fayetteville Rd, Suite 104, Durham, NC 27713
Mr. Mike Zaccardo, CE Group Inc., 11000 Regency Parkway, Suite 410, Cary, NC 27511

~~+
July 27, 2ao7
Steve O'Neal
CHATH~IVI DEVELOPMENT CORPORATION
6?OS Fayetteville Road, Suite t04
t)urham, N(' 27713
Re: Response to DWQ Request
Proposed Creek Crossing !~8
Belmeade Development
Pittsboro, North Carolina
t reo't'echnologies Project No. 1-07-O1q 1-LA
Gcntlcrnen;
.5~'iJ ! 4~ft;lhs JtU(~t t'~:OUr7 '7UitC: Iltti
i~ ~It.it;t~, Ne,~rtra E:~lrvlir~~~ ~?fh I'~
rl 1 >'-'Ib~~3 I °b 14
~t.ax '~ I ;~-'~`~~ 7 1"~f`A
GcoTcchnolobies, [ne. previously completed a subsurface investigation for the creek crossing
#8 at the Belmeade development which was suiirnitted in our report dated July 11, 2007. The
investigation was completed to evaluate subsurlhcc conditions with respect to detern~ining the type of
foundation design which would be best suited for support of the bottomless culvert at that creek
e:rossing. The results of the borings indicated shallow partially weathered rock (PWRj existing at
depths of t to 6 feet below grade with hard crystalline rock being encountered at 3 to 7 feet below
made. 1"here; conditions are considered very favorable for the use of strip footings bearing on the
non-erosive PWR for support of the bottomless culvert. Although the N('I)OT guidelines state that
P~VR should be no deeper than 3 to S feet below brads, we have successfully utilized bottomless
culverts on strip footings bearing on PWR where P~'R has been sibnilicantly deeper than 3 to 5 feet.
What typically occurs is that the foundations are excavated somewhat. deeper than nnrn~al down to
the non-erosive PW1Z and a full thickness concrete footing is then placed ~i~hich bears directly on the
PWR or rock. This type of foundation has been successfully used on numerous bottomless culverts
on PWR throughout the Triangle area. to our opinion, the site is well suited for use of strip footings
bearing on the PWR at 1 to 6 feet below existing grade.
Please contact us if you should have any c~ucstions regarding this inforn~ation or if ~~re may be
of any further assistance.
Sincerely,
DL11pr-ehh,~larn

GeoTechnologies, Inc.
NC Rcgi~tration No.
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