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Home My WebLink About20161268 Ver 2_Inlet Culvert 4 Site 36_20201020 Carpenter,Kristi From:Steenhuis, Joanne Sent:Tuesday, October 20, 2020 9:01 PM To:Herndon, T. Mason; Shaver, Brad ; Lane, Stephen Subject:RE: Inlet Culvert 4 Site 36 Mason, I will add this to the file. Thanks! From: Herndon, T. Mason <tmherndon@ncdot.gov> Sent: Tuesday, October 20, 2020 4:55 PM To: Shaver, Brad <Brad.E.Shaver@usace.army.mil>; Steenhuis, Joanne <joanne.steenhuis@ncdenr.gov>; Lane, Stephen <stephen.lane@ncdenr.gov> Subject: Inlet Culvert 4 Site 36 Jimmy Zepeda called me yesterday and asked me to look at an erosion issue on the inlet end of culvert 4. Basically the banks are not stabilizing, they have reworked them and seeded them 4 times. On the upstream left side stormwater is naturally draining toward the channel and scouring the banks (see rill on left bank in attached photo). They have installed wattles and special sediment fence and it has not help with the bank scouring. We have permanent surface water impacts already permitted beyond the inlet headwall for about 48 ft for channel improvements. Since we can not get these banks to stabilize and continue to have erosion issues, we are going to rip rap these banks, from the current rip rap at the wing walls which we previously approved, out to the disturbed limits. So there will be a total 41 lf of bank stabilization from the HW to the disturbed limits on the SE Inlet bank and 34 lf of bank stabilization from the HW to the disturbed limits on the SW Inlet bank (see attached permit drawing). There will be no additional permanent impacts with this revision beyond what has already been authorized. Furthermore, we will be keying in the rip rap at the toe of the bank and will leave the sparse naturally vegetated small floodplain bench on the right side alone (the rip rap will be keyed in at the bottom of the coir fiber matting as seen in the attached photo). The contractor will be completing this work as soon as possible so they can get these banks stabilized and vegetation established in any disturbed areas while there is still some decent growing conditions. We can visit this site at the next field review. If you have any questions or concerns please do not hesitate to contact me. Thanks! Mason Herndon Environmental Program Supervisor Division 3 NCDOT- Division of Highways 910-341-2036 office 910-604-0050 mobile tmherndon@ncdot.gov 5501 Barbados Blvd Castle Hayne, NC 28429 1