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HomeMy WebLinkAboutRE_ Stream relocation and mitigation questionCarpenter, Kristi From: King, Art C Sent: Monday, November 6, 2023 9:39 AM To: Harmon, Beth Cc: Davis, Gregory S; Conchilla, Ryan Subject: RE: Stream relocation and mitigation question Beth, That was very helpful. I have already discussed this issue with Steve Brumagin at the Corp. His initial opinion (based on our previous discussion about this project) was; because we are "daylighting" the JS he would most likely approve the plans, but he didn't know if DIMS would accept the stream relocation for credits, and he wasn't sure which type of credits or mitigation you would require or approve. The numbers are roughly: replacing approximately 400 feet of the stream currently inside of the pipe system, minus 100 ft of new crossing pipe under 15-501 to redirect the stream, and approximately 240 ft of the new daylighted stream that will be designed/ approved by the Hydraulics Engineers. There will also be the addition of approximately 60 ft of new impacts for armoring added in the wetland area as scour protection for the discharge back into the downstream. It looks like we would be replacing 400 ft of total pipe minus 100, for a total of 300 ft of replaced pipe, with 240 ft of daylighted stream. Plus, approximately 55ft of new wetland impacts. These are rough numbers and are subject to change/adjustment before we submit the PCN, but they should be in the ballpark. Any advice or information you could give us would be appreciated. I am also going to send the email chain to Ryan Conchilla for his input. Thanks, Art C. King Division Environmental Supervisor NCDOT Highway Division 8 910 773 8015 office 910 690-6581 cell acking .ncdot.gov 121 Dot Drive Carthage, NC 28327 From: Harmon, Beth <beth.harmon@deq.nc.gov> Sent: Friday, November 3, 2023 7:59 PM To: King, Art C <acking@ncdot.gov> Subject: RE: Stream relocation and mitigation question Hello Art — the USACE and DWR will consider any change to an existing jurisdictional stream as an impact associated with a project which will require reporting in the permit application. But as you knowjust because you are impacting a jurisdictional stream and/or wetland, does not mean that mitigation will be required. It will depend on the size and current quality of the area and whether or not the existing stream and/or wetland is providing any environmental uplift. I cannot say whether or not they will require mitigation from DMS to offset the impact or if the additional work you are proposing on the site will be sufficient compensation for any impacts under their regulatory requirements. If the stream is already in pipes then I would imagine it is a degraded which sometimes does not result in the need to provide additional compensation. It does sound to me that you will be improving the overall condition of the existing stream and surrounding area which should give you some restoration mitigation credit toward any permanent impact. How much stream footage will be impacted and how much are you calculating will result from the improvements? I can give you an acceptance letter for the amount of total anticipated impacts without the amount of anticipated stream and/or wetlands after the improvements. You could use that as a secondary mitigation strategy. Environmental Analysis Unit does not sometimes when they are uncertain if their proposed area restored will be accepted by the regulatory agencies as mitigation to offset the project impacts. Sorry but that is all I can offer. My apologies for not being very helpful. Beth Harmon NCDOT Coordinator Division of Mitigation Services Department of Environmental Quality 919-707-8420 office beth.harmona-deg.nc.gov Please note email address change. 1652 Mail Service Center Raleigh, North Carolina 27699-1652 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. NORTH OAROLI Ny. De0arlment or EnviFW OF"Ital Ou allt+� Email correspondence to and from this address is subject to the North Carolina Public Records Low and may be disclosed to third parties. From: King, Art C <acking@ncdot.gov> Sent: Friday, November 3, 2023 10:19 AM To: Harmon, Beth <beth.harmon@deg.nc.gov> Subject: Stream relocation and mitigation question Beth, We have an upcoming project that involves the relocation of a Jurisdictional Stream that is currently being conveyed down the roadside of US 15-501 north of Laurinburg through a system of approximately 130 ft of undersized pipes. There is an on -going problem at this site that involves the flooding of the parking lot at a convenience store/ gas station (Nic's Pic Kwik), and flooding that goes out into the roadway. We intend to shift the flow to the opposite side of the road via a new pipe under 15-501 and then "daylighting "the stream for 150Ft. in a newly constructed open bottom stream design. My question is how should the impacts be calculated for mitigation? Does the fact that we are eliminating the piping system and daylighting the stream allow us to offset the relocation impacts, or can we get restoration credit to offset some of the impacts? We are in the process of developing the PCN for submission to the Corps of Engineers and DEQ so we need to get the impact calculations properly adjusted. For reference, the GPS coordinates are (approximately) 34.8001041-79.458195. 1 have also attached a screenshot of the proposed plans. Any information you could give would be most helpful. Thanks, Art C. King Division Environmental Supervisor NCDOT Highway Division 8 910 773 8015 office 910 690-6581 cell acking ncdot.gov 121 Dot Drive Carthage, NC 28327 V Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties. Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized state official.