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Home My WebLink About20000874 Ver _Staff Report_20071211DOT Division 8 Compliance Inspection Conducted December 11, 2007 For TIP Project R2231CB, R2231CA, R2231B, and R2231A (US 220 Widening/Bypass) in Richmond and Montgomery Counties A field visit was conducted by Polly Lespinasse, Ken Averitte (DWQ), and Art King (NCDOT). The results were as follows: R2231 CB Permit Site #3, Station 254 +60 (Stream Restoration Area on North End of Project -East Side of 220): Inlet End: There is a large elevation drop from the stream to the inlet end of the culvert. Small rock was used and the stream has piped behind the rock (not flowing over rock). The channel does not have a lot of slope and there are many seeps throughout the area (lots of herbaceous wetland vegetation). Little woody vegetation was observed in the stream buffer (as required by the Water Quality Certification). Culvert installation appears to be compliant. Outlet End: A cross vane was installed to alleviate a perched pipe condition. The culvert appears to be in compliance and the perched condition alleviated. Required Action; Install woody vegetation in the stream buffer as required by the permit. Permit Site #6, Station 268 +40 (Stream Restoration Area on North End of Project -West Side of 220): Inlet End: The culvert appears to be a little high. DOT staff indicated that it was properly buried. The stream may have headcut slightly. Outlet End: The previously required repairs have been made and the stream appears to be functioning properly. Required Action: Monitor headcut at inlet. If the headcut continues or the stream destabilizes, additional repairs may be required. Permit Site #5, Station 260 +80: Inlet End: A headcut has formed but there appears to be sufficient grade control in the stream (tree roots). DWQ staff placed some rock in the headcut while on site to attempt to hold the headcut. Outlet End: The outlet end of the culvert appears to be in compliance. Required Action: Monitor headcut at inlet. If the headcut continues or the stream destabilizes, additional repairs may be required. Note: Permit Site #1, Station 242 +80 was not inspected. R2231 CA Permit Site #4, Station 191 +00, Duel Bridge Over Wetland /Naked Creek (Lumber River Headwaters): Required Action: None. Site appears to be in compliance. Permit Site 01, Station 173 +10: Inlet End: There is some riprap in the channel and the stream is flowing into the wingwall of the culvert. Outlet End: The outlet end of the culvert appears to be in compliance. Required Action: Remove riprap from channel and redirect stream into the culvert. R2231B Permit Site #6, Station 141 +60 (Myricks Pond): Inlet End: The stream has reformed through the old pond and woody vegetation and monitoring wells have been installed. A fence has been installed across and slightly above the stream prior to it entering the culvert. Outlet End: A step pool system /channel has been constructed from the pond to the adjacent wetland. The banks along step pool system /channel do not appear to be stabilized in some sections (bare slopes). Required Action: Remove the section of fence that crosses the stream at the inlet end. The fence will act like a dam, catching debris, and will cause the stream to return to its previous state and possibly remove the hydrology from the downstream system. The banks of the step pool system /channel must be stabilized. DWQ staff recommends live staking the banks using the vegetation in and around this area (which is readily available). Permit Site #5, Station 135 +80: Inlet End: This is a pond /seep area. There is a rock erosion control measure (donut) around the inlet. The measure is at an elevation which is holding back the water and providing good hydrology for the stable, nicely vegetated wetland upstream, behind the erosion control measure. Outlet End: The erosion control measures were recently removed and the area has been graded and is not stabilized. Required Action: Recommend leaving the erosion control measure at the inlet end. Removing it may lower the water elevation and potentially removing the hydrology from the wetland. The outlet end must be stabilized where the erosion control measures were recently removed. Permit Site 0, Station 108 +50: Inlet End: The erosion control measures were recently removed and the area has been graded and is not stabilized. Outlet End: The outlet end of the culvert appears to be in compliance. Required Action: The inlet end must be stabilized where the erosion control measures were recently removed. Permit Site 42, Station 103 +80 to 105 +20: Required Action: None. Site appears to be in compliance. Permit Site #1, Station 92 +40: Inlet End: The erosion control measures were recently removed and the area has been graded and is not stabilized. Outlet End: The erosion control measures were recently removed and the area has been overly graded and is not stabilized. Required Action: The inlet end must be stabilized where the erosion control measures were recently removed. The outlet end must be reshaped (stream section) and matted with coconut fiber matting to stabilize the area. Permit Site #1 B, Station 85 +80: Inlet End: There are some small headcuts upstream of the culvert inlet and then there is an approximate 1- foot headcut upstream of the small headcuts. Outlet End: The outlet end of the culvert appears to be in compliance. Required Action: A grade control structure must be installed upstream of the culvert inlet to stop the headcut and stabilize the stream. Permit Site #1A, Station 68 +35: Inlet End: A double box culvert was installed and the stream was directed into the wrong culvert. However, the stream appears to be stable. Outlet End: A double box culvert was installed and the stream was directed into the wrong culvert. However, the stream appears to be stable. Required Action: None. 82231 A Permit Site IX, Station 57 +03: Inlet End: A double box culvert was installed and the stream was directed into the wrong culvert. There is some riprap in the stream. The stream appears to be stable. Outlet End: A double box culvert was installed and the stream was directed into the wrong culvert. However, the stream appears to be stable. Required Action: Remove the riprap from the thalweg of the stream at the inlet end of the culvert. Permit Site VIII, Station 52 +30: Inlet End: No compliance issues observed. Outlet End: Did not inspect. Required Action: None. Permit Site VIII, Station 46 +75: This site consists of two pipes that discharge into a single stream at the downstream end. Inlet Ends of Both Pipes: No compliance issues observed. Outlet End of Both Pipes: No compliance issues observed. Required Action: None. Permit Site IV, Station 30 +40: Inlet End: There are some logs in front of the double barrel culverts and two streams feed into these culverts. Both streams have headcuts, but appear to be stable. Outlet End: The culvert is misaligned at the outlet end and the stream has to turn approximately 90 degrees to get into the original stream. There is some erosion of the stream bank in this area due to the alignment. Required Action: The bank at the outlet end must be armored or provide some other type of bank stabilization to prevent continued streambank destabilization. Permit Site III, Station 27 +00: Inlet End: There is some riprap in the thalweg of the stream. Outlet End: No compliance issues observed. Required Action: Remove riprap from the thalweg of the stream at the inlet end of the culvert. Note: The following Permit Sites were not inspected: Site X and IIB. The following two (2) sites were inspected as part of the project based on the USAGE requiring that they be included as part of the larger project: Permit Site at Millstone Road, Crossing at West End: Inlet End: The culvert is not properly aligned with the stream and there is some headcutting apparent. However, the stream appears to have stabilized. Outlet End: The culvert installation appears to be compliant. There is some erosion over the culvert which will cause sediment to enter the stream if not properly stabilized. Required Action: Stabilize eroded area above the outlet end of the culvert. Permit Site at Millstone Road, Crossing at East End: Inlet End: The stream has developed a headcut. There is some saprolite in the stream which appears to be holding the stream stable at this time. Outlet End: There is some riprap in the stream. Required Action: Monitor the headcut at the inlet end. If the headcut continues or the stream destabilizes, additional repairs may be required. Remove riprap from the stream at the outlet end.