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Home My WebLink About20160849 Ver 1_USACE Correspondence_20200323Strickland, Bev From: Tugwell, Todd J CIV USARMY CESAW (USA) <Todd.J.Tugwell@usace.army.mil> Sent: Monday, March 23, 2020 9:40 AM To: Haupt, Mac; Davis, Erin B; Wilson, Travis W.; Bowers, Todd; Steve Kichefski; Jones, M Scott (Scott) CIV USARMY CESAW (USA); Byron Hamstead Cc: Roden Reynolds, Bryan K CIV (US); Crumbley, Tyler A CIV USARMY CESAW (USA) Subject: [External] Upper Rocky Bank Attachments: Upper Rocky Plan Sheets.pdf CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to report.Spam@nc.gov<maiIto: report.spam@nc.gov> All, We had a conference call last week with WLS regarding the Upper Rocky Bank site, located outside Charlotte. There were a number of issues discussed, but there is one that I would like feedback on from the IRT. The mitigation plan includes several streams entering the floodplain, and two in particular that run parallel with one another for approximately 1,000 feet. At some points during this streach, the streams are located within 50 feet of each other. I've attached the design overview and plan sheets. The tributaries in question are R3, which has a drainage of approximately 339 acres, and R6, with a drainage area of approximately 147 acres. When we conducted the field review of the site, WLS was told that we did not agree that these two channels should run parallel down the floodplain, but should flow together farther upstream. The existing streams on the site appear to have been channelized in the past, with R3 running along the floodplain edge, so they currently run parallel and flow together in the same general areas where WLS proposes, but the question is whether the restored streams should do this. The USGS topo map shows the streams coming together much farther upstream, and there is no defined crenulation or valley visible on the Lidar, though you can see the streams in their current location. We have reviewed the proposed mitigation plan and told WLS that we continue to have problems with the proposed approach. According to WLS, they believe that having two streams within the floodplain reduces overall risk to the system by dispersing the flows (this is an urban system). My concern is that this approach is something we've seen in the past, and we have also had numerous projects where we were unhappy with the results of this type of approach. Obviously, there is a lot of incentive for the provider to take this approach, as it will likely add upwards of 800 additional stream credits to the site. This is something that we used to see frequently, but don't generally see now that providers are aware that we are looking for it. So I'm looking to the IRT for input. Please take a look at the attached plans and let me know your thoughts. We've committed to WLS to try to work through these concerns by the end of the week. Thanks, Todd TugwelI Mitigation Project Manager Wilmington District, US Army Corps of Engineers 3331 Heritage Trade Drive, Suite 105 Wake Forest, North Carolina 27587 (919) 554-4884 ext. 58 f,.::... '%"r*s.F-':;•oa: ., III �:•:::•: - , I7 7►1 WATER & LAND SOLUTIONS (919)614-5111 ,.• • EM m ROCKY MITIGATION ■■:■■ ■ SEES M■■■■■■■■■■■■■W■ MEN ■■■EE■ ■ ■■■■■ S■■■■■E■■Em■■ :-■•■■■::■�■■::■■■■MOM■■■■S■■SM■■■■■■M■NONE SEES■■ E■■■u■■■■m■ ■■■■■■u■■■■■■■■■■■■■u■■■■Mu■■■■■■■■■■■■■■■■■ ■u■u■■M■■BANK ■■■mu■■■u■■■■■■■M■■■m■■■u■■■■■■■■■■■■■■■ ■■E■N■MMEN■o■■a�m ■■�■■■■■E1■■■7■ ■■■■■■ ■■■■■■■■■■■■■■■■■ ■■■SEEN■■■■■■■■■■ . omit, i■■ : R�w�■u�uM� M■■■■EM■■wMMM■■■■ MMuuM■■E : g uu If Elf, I■■■m■��■■; ■SEEP°I■!■■F? INN !■■OEM ■E�■M'�MM■■EIOS■S■■■ 'ME on 0 mom ■ �. 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