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Home My WebLink About20170220 Ver 1_USACE Compliance Comments_20180606 (2)Carpenter,Kristi From: Bailey, David E CIV USARMY CESAW (US) <David.E.Bailey2@usace.army.mil> Sent: Thursday, June 07, 2018 11:13 AM To: Norton, Apri) R; Thomson, Nicole J; Parker, Jerry A Subject: RE: [External] Compliance: Bridge 349, SR 2715, Guilford Co; SAW-2017-00367 CAUTION: External email. Do not click links or open attachments unless verified. Send all suspicious email as an attachment to Report Spam.<mailto:report.spam@nc.gov> Hi everyone. April rightly pointed out that I was referring to Bridge 379 in Guilford Co. Tha n ks. -Dave Bailey David E. Bailey, PWS Regulatory Project Manager US Army Corps of Engineers CE-SAW-RG-R 3331 Heritage Trade Drive, Suite 105 Wake Forest, North Carolina 27587 Phone: (919) 554-4884, Ext. 30. Fax: (919) 562-0421 Email: David.E.Bailey2@usace.army.mil We would appreciate your feedback on how we are performing our duties. Our automated Customer Service Survey is located at: http://corpsmapu.usace.army.mil/cm_apex/f?p=136:4:0 Thank you for taking the time to visit this site and complete the survey. -----Original Message----- From: Norton, April R [mailto:april.norton@ncdenr.gov] Sent: Thursday, June 7, 2018 11:03 AM To: Bailey, David E CIV USARMY CESAW (US) <David.E.Bailey2@usace.army.mil> Subject: [Non-DoD Source] RE: [External] Compliance: Bridge 349, SR 2715, Guilford Co; SAW-2017-00367 Hey Dave, Is this Bridge 379? Thanks, April -----Original Message----- From: Bailey, David E CIV USARMY CESAW (US) [mailto:David.E.Bailey2@usace.army.mil] Sent: Thursday, June 07, 2018 9:59 AM To: Thomson, Nicole J<njthomson2@ncdot.gov>; Parker, Jerry A<jparker@ncdot.gov> Cc: Norton, April R <april.norton@ncdenr.gov> Subject: [External] Compliance: Bridge 349, SR 2715, Guilford Co; SAW-2017-00367 CAUTION: External email. Do not click links or open attachments unless verified. Send all suspicious email as an attachment to Report Spam.<mailto:report.spam@nc.gov> Hi Nikki and Jerry. Following our visit to U-2525B on Tuesday, April and I visited 3 bridge to culvert projects completed late last year. One of those was a bridge to triple-box culvert project, Bridge 349 on SR 2715 in Guilford Co. The culvert was installed, the road shoulder slopes appeared stable, and the project was open to traffic. Although stream flow on the day of the site visit appeared to be normal, this stream appears to see large fluctuations in flow and transports a large bed load of sediment. As such, there were large bars/benches that had been recently deposited and it was difficult to see the sills and whether they were installed according to plans. That said, it is clear that while the designed low flow (i.e. main flow) culvert box was the middle box, the stream is using the western-most hi flow box as the low flow box. The rip rap placed a few feet in front of the western-most hi flow box, intended as the toe of a narrow floodplain bench, has either been washed way or is partially buried in sediment; the small designed floodplain bench in this area is completely inundated. The middle box has silted in with between 2 and 3 feet thick sediment. The eastern hi flow box appears to be functioning as designed. Please see the attached marked-up plan sheet and pictures to help illustrate our findings. Since the stream flow is concentrated in the western hi flow box, the downstream constructed floodplain bench on the west side of the stream has become unstable. Flow from the western-most culvert exits the box, and immediately turns 90 degrees, over the rip rap floodplain bench toe, and back into the old channel. Currently, matting is bunched up along the rip rap toe. However, long-term this is an unstable situation that will lead to this portion of the floodplain bench being eroded away. Further, given that the sill in the center box is 1 foot lower than the 2 outside boxes, hi flows could be expected to push the large amounts of accumulated sediment downstream in a large pulse. Since the culvert is not functioning as designed (as permitted), please provide information regarding how the project will be augmented to provide long term stability at the stream crossing location. It is possible that additional permitting will be necessary depending on the proposed solution. Please let me know if you have any questions. -Dave Bailey David E. Bailey, PWS Regulatory Project Manager US Army Corps of Engineers CE-SAW-RG-R 3331 Heritage Trade Drive, Suite 105 Wake Forest, North Carolina 27587 Phone: (919) 554-4884, Ext. 30. Fax: (919) 562-0421 Email: David.E.Bailey2@usace.army.mil We would appreciate your feedback on how we are performing our duties. Our automated Customer Service Survey is located at: Blockedhttp://corpsmapu.usace.army.mil/cm_apex/f?p=136:4:0 Thank you for taking the time to visit this site and complete the survey.