DOC081116-08112016115237.pdf

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LOCATION.� SR lll7 - R(JCKINGHAM TWNSP.
TYPE OF WORK TEMP(�RARY DRAINAGE EASEMENT FOR
INSTALLATIDN OF ERUSI011( CONTROL DEVICE TO BE
INSTALLED AT THIS SITE DUE TD US 74 SLOPE FAILURE
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DIVISIOIV OF HIGHWAYS ROCICII�IGIiAM DISTRICT OFFICE
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SURVSY DATB: PLAKS COMPL67B DATB:
7-47-2010 K. R. HEDRICK p8
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SURIBYED BY.• R(GHT OF WAY PL9NS DATE:
ROCKINGHAM DISTRICT OFFICE __ J.L. LINDSEY r,a
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CONSTRUCTIO�Y PLAXS DATE:
C.G. BROWN
HYDR9ULICS HNGINEHR
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Richmond County
Route: US 74 Bypass EB
Project: Slope Repair and E/C Plans
Project History:
On Saturday, Mazch 6, 2010, the North Cazolina Highway Patrol nodfied the Richmond
County Maintenance office that a passerby observed a lazge eroded azea on US 74 Bypass
just south of SR 1109 (Zion Church Road) on the east bound slope behind the guazdrail.
Upon investigation that night by the County Maintenance Engineer, Mdy Cochran, and
the Transportation Supervisor III, Eddie Cagle, they found a 50' fill slope that had eroded
at the edge of pavement some 40' wide and 40' deep extending 120 or more feet out to
the toe of the existing fill slope. Since that time, vazious agencies including DENR —
Division of Water Quality, CORP of Engineers, and various NCDOT personnel have
visited the site and made recommendations for repair and erosion control.
As of Monday, March 29, 2010, a large check dam has been installed approximately'/z
mile down stream of the slope failure at a location suggested by the Kim Garvey of the
Corp of Engineers. The check dam was installed down stream to collect existing silt in
the stream bed that may get moved during heavy rain events to prevent further
contamination of the EEP site on the Hitchcock Creek (Old Steele's Pond). This check
dam is located in an existing dirt road that the stream runs across. The owners have made
a ford across the stream at this location which made a natural sediment storage azea at the
check dam. The property is owned by the Von Drehle Corporation and we have access
through a locked gate to this property to maintain the check dam as needed. This is the
same company that sold the stste the aforementioned EEP site.
On Tuesday, March 30, 2010, we constructed an access road that runs along the bottom
of the fill slope to get material in to build the Type-B sediment dams and then to use as a
way to haul materiaUsilt out as needed during the life of the project.
On Wednesday, Mazch 31, 2010, Basin 2 on the east side of the slope failure was
installed and construction began on Basin 1. These are Temporary Sediment Dam Type
— B basins with baffles, one on each side of the wash area to protect the sueam that
passes under US 74 Bypass in a 24" RCP. These basins will be cleaned as needed and
will remain in place until we aze released from maintaining erosion on the site. These
sediment dams will collect any silt from the repair work to fi�rtlier prevent offsite silt in
the stream. Attached are the design spreadsheets for these sediment dams and plan sheet
which shows the size and location of the basins.
On Thursday, April 1, 2010, we plan to complete installation of Basin 1.
Repair of the slope began on Mazch 31, 2010 by our contractor, Hudson Paving, and will
proceed until slope is repaired. Then NCDOT maintenance forces will replace the slope
drain pipe and drainage structures, and seed and mulch all disturbed azeas.
Also, on Mazch 31, 2010, Brian Wrenn with DWQ and Art King, Division 8
Environmental Officer visited the site to fuither determine what cleanup efforts will be
required of the Deparhnent. After discussion with Brian and Art, they reassured me that
DWQ will allow some type of sediment pond/basin to be installed downstream in the area

where the check dam is installed. Brian is of the opinion that some type of basin larger
than the existing check dam needs to be installed to collect silt that may be further moved
in the existing stream. I asked Brian for guidance in what size basin need be installed
since this will be located on private property. Alsq this area drains approximately 160
acres, so any type of sediment pond/basin will be lazge in size and could possible cover
several acres of property. Once a decision is made between DWQ and Division 8 staff on
the sediment pond or other measure that will replace the check dam, the Division 8 Right
of Way office will then assist in obtaining a drainage easement for the area to be
disturbed on the Von Dretile property prior to any major construction taking place.
I meet with Jerry Lindsey of Hydraulics on Wednesday as well and he gave suggestions
on where to replace the slope drain pipe. I also discussed the sediment pond idea with
him and he advised that his office could assist me in designing a sediment pond/basin.
Please contact me at 910-582-7075 (office) or 704-690-0749 (cell) with any questions.
Kevin R. Hedrick, PE
District Engineer
3/21/10
Attachments

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WRTENS EOGE
SILT BpSIN 2MPOUNDfAENT AAEA
TEE-RISER
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. HOTES: 7. SUflfACE APEq ANp VOWFIE AqE TO BE SITE SPECIFIC.
2. CIEAN OIIT SEOIMENT WHFN STOqAGE VOLUME qEACHG3
59b OF MIN. 9TOppf3E VOLUME.
PLAN VIEW 3. MINIMUM SURFACE AAEA AND MiN]MUA� VOWME AqE MEPSVFE�
6ELOW THE TOP OF PqtNCIPLE SPILLWAY (i0a pF qISER).
<• ALL RIMENSIOk9 OF BFSSq WILL NOT PEOUIR6 CONSTNUCTION
TO NEr1T LINES.
5. TIIE EA0.TN pYl(E MAV BE CONSTHIICTE� AI.ON6 ONE OP MOqE SIOES.
EXCAYpTION MAV BE HEOUIRED TD PROYIDE MININUM SURFACE
ANEA qN0/Ofl MINIMUM 9TOMOE VOLUM[.
6. THE �YNE SHALL BE CONBTHIICTEO OF MATEqiA� SUITPSLE FOR
ANO MEETING NOAOWI�y EMBANKMENT 9pECIFICATI0N5.
7. TO FACILITATE DETEOMINATION OF Nq}ryiENANCE 0.EMIOUT
PE�UZREN[NT A MM1pKER SNOUL� BF PL4CED SN iryE BASIN
SN6ICATtNC THE 504 VOWME tEVEL.
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STATE OF NORTH CAitQLINA
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