20120756 Ver 1_More Info Received_20120828

B 4757 SMP (revised)
B -4757 SMP (revised)
Dllday, Jason L
Sent Thursday August 23 2012 2 45 PM
To Euliss Amy
Page 1 of 1
Amy
Attached is a revised copy of the stormwater management plan for B 4757 They tried to tailor the wording to
more closely resemble the text In the Jordan Buffer Rules Let me know if this will work for you and 111 send
copies to the other application recipients If you have any questions give me a call
Jason
Jason L Dllday
Environmental Specialist
Natural Environment Section
(w)919 707 6111
(f)919 212 5785
Email correspondence to and from this sender is subject to the N C Public Records Law and may be disclosed to third parties
https //mail nc gov /owa/ ?ae= Item &t =IPM Note &1d= RgAAAADMSzLcd9W2TJH14 %2bm 8/29/2012
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STORMWATER MANAGEMENT PLAN
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B 4757 WBS No 38529 1 1
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GUILFORD COUNTY
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Hydraulics Project Manager Stephen R Morgan PE ,
Date 8/22/2012 +
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ROADWAY DESCRIPTION
The project involves the replacement of bridge number 175 over Buffalo Creek on SR q
2795 (Huffine Farm Road) in Guilford County The overall length of the project is 0 123 S }
mile The project will replace an existing 3 span 92 foot length bridge with a new span
135 foot length cored slab bridge An off site detour will be required +
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ENVIRONMENTAL DESCRIPTION
The project is located in the Cape Fear River Basin The proposed bridge is over Buffalo
Creek which is classified as WS V NSW and subject to Jordan Lake Buffer Rules
Approximately 0 01 acre of surface waters will be impacted and 212 sq ft permanently
impacted due to piers Approximately 0 03 acre of surface water will be temporarily
impacted
Approximately 4213 square feet of buffer zones will be (allowable) impacted
BEST MANAGEMENT PRACTICES AND MAJOR STRUCTURES
Best Management Practices (BMPs) and measures used on the project are non structural
and are an attempt to reduce the stormwater impacts to the receiving stream due to
erosion and runoff Bridge deck drainage will not be allowed to directly discharge into
the water and is routed to a grass swale before entering the buffer Existing lateral
roadway ditches have been realigned and designed to function as grass swales Diffuse
flow cannot be provided prior to the buffer The existing ditch and the grass swale flow
lines are lower than the natural ground prior to and through the buffer in an effort to
provide positive drainage using minimum slope (0 4 %) No additional travel lanes have
been added All other storm water will enter the buffer as sheet flow
GRASSED SWALES
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From STA 12 +75 to 13 +50 —L
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From STA 12 +75 to 13 +25 —L
(RT)
From STA 13 +50 to 13 +83 —L
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From STA 13 +25 to 13 +65 —L
(RT)
BRIDGE i
L STA 14 +25 04
Replace existing bridge over Buffalo Creek
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