20110661 Ver 1_More Info Received_20110930

Jones & Cnossen
A&IMM ENGINEERING, PLLC
Civil Engineering I Construction Management I Land Planning
221 N. SALEM ST, SUITE 200
PO BOX 1062
APEX, NC 27502
Office: 919-387-1174
Fax: [phone]
www.jonescnossen.com
September 27, 2011
Ms. Karen Higgins
NCDWQ - Division of Water Quality
1650 Mail Service Center
Raleigh, North Carolina 27699
RE: Request for More Information
Chastain Subdivision (DWQ Project #2011-0661)
Dear Karen,
II-oL11 to1
I have received your letter Request for More Information dated August 9, 2011 and am herein providing the
following responses for continuation of staff's review of the project:
1. The approximate site location has been identified on the USGS topographic map and Wake County
soil survey maps attached.
2. A full size plan sheet (24"x36") is attached showing the site and surrounding area with topographic
contours.
3. An 11"x17" site plan is attached showing the approximate location of the erosion feature on the
embankment slope.
4. The riparian buffer impacts are shown and labeled on the 11"x17" site plan attached.
5. The riparian buffer impacts of Zones 1 and 2 are shown on the 11"x17" site plan attached.
6. A BMP Supplement is not available for plunge pools in the BMP Manual so I've attached the
recommended repair received by our geotechnical consultant. The recommended repair is made
specifically for this site given the site constraints; namely, site accessibility between existing houses
and the significant slope of the existing embankment.
7. A signed Agent Authorization Form is attached.
8. A CD containing the full size site plan is attached.
It is hoped that this information is sufficient for approval following your review. If you have any questions
or need anything else, please let me know.
Sincerely,
III V ! Iwl OA"
Peter D. Cnossen, P.E.
Jones & Cnossen Engineering, PLLC
Cc: Divida Johnson - Omega Management
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ACME Mapper 2.0 - 7.4 km SW of Knightdale NC
http://mapper.acme.com/[9/12/2011 9:09:11 AM]

ACCESS AGREEMENT
And
AGENT AUTHORIZATION
I hereby authorize GlZ?SJ,r?'S to act as an
authorized agent for with regards to the
project. " _57 , t6
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staff is authorized to consul directly with representatives of the U.S. Army Corps of
Engineers and/or N.C. Division of Water Quality regarding site visits, permitting, or
other necessary consultation. Representatives from C7145.S "'/2 4 BLS must
accompany agency personnel while on the site.
Applicant/Owner:/lcS L "?( '61ex
Representative: rV? / t Z&Z:S ,
e. ./7 sl
Signature:
Date: ? /?
Address:1,mo ?• ? df
Phone and Fax: W-Y111 elle is"4i
Email:
Geotechnical and Construction Materials Testing Services
June 9, 2011
Peter Cnossen, P.E.
JONES & CNOSSEN ENGINEERING
P.O. Box 1062
Apex, NC 27502
Re: Recommendation for Stabilization of Erosion Feature
6009 Ricker Road
Raleigh, North Carolina
GeoTechnologies Project No. 1-11-0358-EA
Gentlemen:
GeoTechnologies, Inc. performed a site inspection at 6009 Ricker Road in Raleigh, North Carolina in
order to develop recommendations for stabilizing an erosion feature which exists below a discharge pipe on a
slope behind existing homes. The pipe discharges part way up the slope and is a smaller diameter pipe which
ties into a much larger pipe. It is our understanding that water is collected in the larger pipe during storm events,
and that the water then is released through the smaller pipe into the drainage feature. The original design
included a level spreader at the discharge end, however, since installation of the project in about 2001 to 2003,
very significant erosion has occurred below the discharge end.
The erosion feature now has near vertical side banks as high as 5 to 6 feet, and the feature appears to be
30 to 40 feet in width extending from just below the pipe to within about 15 feet of the existing creek. At the
discharge end, an approximately 4 to 5 foot high bank has been created, and the water which collects within the
erosion feature flows through an approximately 4 foot wide opening which looks much like a breach in an
embankment dam. Compounding the problem, a white oak which previously existed between the end of the
erosion feature and the creek has fallen over resulting in additional erosion behind the stream bank. Based on
visual observation of the stream bank, it appears that that stream may run as much as three-quarters full during
some storm events adding to the erosion at the downstream end. Based on the size of the erosion gulley which
has developed, it appears that significant volumes and velocities of water are occurring within the drainage
feature during storm events. The area is extremely difficult to access and getting to the area with bulldozers and
compaction equipment to completely rework the area will be difficult.
Based on the preceding considerations, it is our opinion that the best repair will be to clean out the
debris and existing rip rap within the basin area, shape the bottom slightly to allow installation of a heavy
nonwoven geotextile fabric, and to then place the nonwoven geotextile fabric and cover it with stone. Ideally, 6
to 8 inches of #57 stone should be placed on the fabric where the grade is flat enough that the stone will stay on
it. A class #2 rip rap should then be placed over the #57 stone to reshape the feature and create a collection
channel. Ideally, that collection channel should be shaped to create a shallow plunge pool near the discharge end
of the feature. We suggest not tacking geotextile fabric directly against the existing penetration through the
lower end of the erosion feature.
By creating the general shape shown on the attached Figure 1, water which exits through the pipe will
be contained within a rip rap channel, and the velocity of the water should be substantially reduced by passing
3200 Wellington Court, Suite 108 -Raleigh, North Carolina 2.7615 -Phone [phone] • Fax [phone] - www.geotechpa.corn
Jones & Cnossen
Re: 6009 Ricker Rd.
June 9, 2011
Page: 2
through the rip rap and the plunge pool at the discharge end. The water will exit the erosion feature and
eventually will open up the final 5 to 10 feet to the creek creating a straight path to the creek. However, the
proposed installation should prevent future erosion within the current eroded channel.
Please contact us if you have questions regarding this information or if we can be of any further
assistance.
Sincerely,
GeoTechnologies, Inc.
rr
Edward B. Hearn, P.E.
NC Registration No. 9520
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