US 74 Slope Falire

STATE OF NORTH CAROLINA
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DEPARTMENT OF TRANSPORTATION ItR ft �
BEVERLY EAVES PERDUE
GOVERNOR
RICHMOND COUNTY
MEMORANDUM TO:
FROM:
DATL:
SUBJECT:
EUGENE. A. CONTI, JR.
SI: mTARY
Art L/in g , Di . Ei ii nrnental Officer
Kevin R. e r c , District Engineer
August 20, 2010
Silt Basin Design — US 74 Bypass Slope Failure
Attached are plans and design calculations from Jerry Lindsey, P.E., NCDOT Hydraulics
Engineer, for the proposed silt basin down stream of the slope failure site in Richmond County.
The proposed basin will be 95' x 185' in size and we are acquiring a 2 -acre temporary drainage
casement around this basin.
Once installed, this basin will drain through a 60" riser and a 54" corrugated metal pipe
continuing through the dyke of the basin. The dyke will be constructed in the existing dirt road on
the property and will remain as a roadway for [lie property owner to access their other property
across the stream. At the end of the silt collection process, the 54" CMP will remain in place for the
stream to continue to travel through as it did before in a 24" CMP.
Our maintenance staff will monitor the basin monthly and after a rainfall of I" or greater to
ensure it is tiinctioning properly. Also, silt will be removed from the basin as needed and new filter
stone placed around the 60" riser pipe as required.
Once the Right of Way Department has secured the necessary easement, we plan to begin
constriction of the basin. 1 will keep you informed as to when we are able to begin work at this site.
Please advise if additional information is required.
Attachments
C: Tim Johnson, P.E., Division Engineer
Jeff Picklesimer, P.E., Div. Maintenance Engineer
Andy Cochran, Richmond Co. Maintenance Engineer
219
Clennmer Road, Rockingham, North Carolina 28379
PIIONI:: (910) 582 -7075 FAX: [phone]

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