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Home My WebLink About20171018 Ver 1_Email_20180808Carpenter,Kristi From: Dan Duffield <dan.duffield@summitde.net> Sent: Wednesday, August 08, 2018 5:12 PM To: Lee, Craig J; Thomson, Nicole J; Eason, Patty P; David.E.Bailey2@usace.army.mil; Norton, Apri) R; Elam, William H Cc: Parker, Jerry A; Patton, Vance H; Griffith, Aaron E; Whitley, Kimball; Harper, Aaron A; jodyandrews4 @gmail.com; Robinson, Stephen J; Cochran, Cameron; Tracy Parrott Subject: [External] RE: B-5239, Bridges 119 and 126 on NC 87 over the Haw River and Mill Race (respectively) � Please let me know when you would like to meet. I am flexible given the circumstances. I can be reached on my cell at any time. Thanks, Dan Duffield, PE Water Resources Manager 100 E. Six Forks Road Suite 300 Raleigh, NC 27609 Office: 919.322.0115 Direct: 919.644.3144 Mobile: 919.280.8170 Fax: 919.322.0116 �„ „�,,,,�� I „�„�,�, �a� �N �� Creatively Inspired — Technically Executed � � www.summitde.net Ili��u��.. III�III�� i��6im��ui° �I�m� �i��6iui°��i�i�°m�i�� I��'��ui°� I�ui°6ii��6ii�� From: Lee, Craig J <cjlee@ncdot.gov> Sent: Wednesday, August 08, 2018 4:35 PM To: Thomson, Nicole J<njthomson2@ncdot.gov>; Eason, Patty P<peason@ncdot.gov>; David.E.Bailey2@usace.army.mil; Norton, April R<april.norton@ncdenr.gov>; Elam, William H <belam@ncdot.gov>; Dan Duffield <dan.duffield@summitde.net> Cc: Parker, Jerry A<jparker@ncdot.gov>; Patton, Vance H<vhpatton@ncdot.gov>; Griffith, Aaron E<aegriffith@ncdot.gov>; Whitley, Kimball <kwhitley3@ncdot.gov>; Harper, Aaron A<aaharper@ncdot.gov>; jodyandrews4@gmail.com; Robinson, Stephen J <sjrobinson@ncdot.gov>; Cochran, Cameron <acochran@ncdot.gov> Subject: RE: B-5239, Bridges 119 and 126 on NC 87 over the Haw River and Mill Race (respectively) � . �� . . . Just spok� to Cam�ron Cochran and th� Division will follow up with Hydraulics on stabilization n��d�d to th� proj�ct sit�. Thanks, Craig J. Lee, PE Project Manager Hydraulics Unit North Carolina Department of Transportation 919 707 6708 office cilee .ncdot.qov Delivery: 1020 Birch Ridge Dr. Raleigh, NC 27610 Mailing: 1590 Mail Service Center Raleigh, NC 27699-1590 a�� ,��s�� `��,� ��,�,� �,� ,��.�� `�� 'J��`� �°�� .�� :�,� ��W�r �� .� �� ,��,�� :s��,�. From: Thomson, Nicole J Sent: Monday, August 06, 2018 2:47 PM To: Eason, Patty P<peascrn_(�_n�d_crt.:.�ca.v>; �7avi_d_,_�.._�a_i.l_ey2_..C,�_u_sa_ce.:a_rm�.y.._m�.%I; Norton, April R<a.�a_ri.l..._nca.rtcrn_(�_n�d_e_n_r:.�crv>; Elam, William H<�ela_rn�(�_n�d_crt:.�crv>; Lee, Craig J <ca.leeC�ncd_crt �crv>; Dan Duffield (da_n_,_d_u��iel_d_C�sum�_m�itde._n_et) (da_n_:_d_u��iel_d_..C`_"�.._s_u_rn�_rn�.itde.:_n_et) <da_n_:_d_u��iel_d_..,C`„"�,.._s_u_rn�_rn�.itde_:_n_et> __ Cc: Parker, Jerry A<jparkerC`�ncdcrt.�crv>; Patton, Vance H<v_h.pattcr_n_(�_n�dca.t.:.�crv>; Griffith, Aaron E<a_e�ri��ith(c�_n�dcrt.:.�ca.v>; Whitley, Kimball <kwh.itl_e.�3_(c�_n�dca.t...�ca.v>; Harper, Aaron A<aaha_r�a_e_r_(e�_n�dca.t...�ca.v>; icadvandrews�(e��m�ail.ccrm�; Robinson, Stephen J <s.a_rca_k�.%nsca_n_..,C`„�,.._n_cdca.t.:.�cav> Subject: B-5239, Bridges 119 and 126 on NC 87 over the Haw River and Mill Race (respectively) Good afternoon everyone — Attached you will find a report for the above named bridges and a schematic of the findings (PDF) — please review both together as the PDF depicts the locations of the pictures in the report. In short, the side bank/wall of Mill Race Pond failed due to the recent storm events and not only did the pond completely drain out, but now Mill Race is flowing through the work site (green highlighted area on attached plan sheet). As the water table is still significantly elevated (and because of the amount of drainage coming down both the Haw River and Mill Race), both rivers are at or have overtopped and are still currently flooding out the low lying areas (including the work site). It should be noted that just upstream of our project there is a dam on both the Haw River and Mill Race. I indicated the current flow locations in blue on the attached PDF. While we were on site, it was discussed if the "gates" on the Mill Race dam could be closed. The Glen Raven folks indicated that they had no problem with NCDOT shutting the gates, however, I think we all were in agreement that would be a large liability on the Division. Further, there is a significant buildup of trash/sediment/vegetation immediately in front of the gates so I'm not sure how one would actually be able to close them without first clearing out the debris. This then leads to the question of IF the gates are closed to stem the flow of Mill Race onto the project site, where will all the water go? At this point, it appears that the Mill Race Dam and the Haw River Dam are the same, connected structure and that possibly, dirt was laid over top of the stone dam to provide an access way (this would be the 10- 15 feet that separate the two). It would seem very likely that Mill Race would "backup" until the stream was able to leave its banks and flood the area between the dams and then flow over the Haw River Dam (and based upon current water levels, it wouldn't take much for this to occur). There is a question, however, regarding the stability and safety of the Haw River Dam. I've attached a picture of the area immediately below the Haw River dam which clearly shows ongoing erosion. Would our actions of closing the gates on Mill Race possibly increase this erosion if the stream found its way over this portion of the dam? This is the reason behind including all of you on this email. There are hydraulics issues in play here that I and other staff cannot adequately address; I know that Bill and Craig worked on this one and did the modeling so I've included them for their expertise and guidance on how best to proceed. There is also the eventual need to rebuild the side of the pond that washed away; we did discuss the timing of that type of work possibly being done in conjunction with the final grading on that side of the project when the temporary bridge structure is removed. This would more than likely necessitate discussions with Glen Raven folks as that timeframe would be in another year from now. I also believe that dam safety may need to be involved due to the recent events, including the washing out and potential rebuilding of Mill Race pond. I believe that the Haw River Dam is a High Hazard Dam and so the Dam Safety folks probably need to be consulted regarding closing the gates on Mill Race and sending more water over the Haw River Dam. At this point, I'm just trying to cover all the bases. From an erosion control standpoint and environmental permitting standpoint, the site is currently under water and clearly it's too dangerous to do any assessment of the damage let alone repair. We will keep the agencies appraised of the situation (they are also on this email). Ironically, in one spot the silt fence and hardware cloth opening are still standing; water is flowing over them, but they are still standing! So, we in the Division are requesting input from the Hydraulics folks on what can and should be done so that Dane can get back to work and so that we can protect the existing structures from being washed away. Once the site is no longer under water, we'll also be able to assess the necessary repairs for sediment and erosion control, permit limits, etc. We will also need to discuss what, if any, modifications to the existing permits may need to be required. Thanks everyone — please feel free to forward this to anyone that I may have left off. Nikki Nicole J. Thomson, PWS Division Environmental Supervisor Assistant Division Environmental Office 919-754-7806 Mobile Nithomson2(c�ncdot.qov PO Box 14996 Greensboro, NC 27415-4996 a�� ,��s�� `��,� ��,�,� �,� ,��.�� `�� 'J��`� �°�� .�� :�,� ��W�r �� .� �� ,��,�� :s��,�. 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