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HomeMy WebLinkAbout20150029 Ver 1_Notice of Deficiency Response_20160108Transportation December 22, 2015 Ms. Amy Chapman 1617 MSC Raleigh, NC 27699-1617 PAT McCRORY covernor NICHOLAS J. TENNYSON Secre�ary Subject: Response to NOTICE OF DEFICEINCY, NOD-2015-PC-0293 Ms. Chapman: D � � .�' ���' [; � � �; t �; ��,, � Jial� �- �y 2016 DENR • YVATER RCSOURCES TRANSPOR7ATION PERMITTING UNIT In reference to the above noted Notice of Deficiency issued by letter dated December 1, 2015, the Department offers the following response as directed in your letter. On November 13, 2015 a loss of sediment occurred on the Tomlin Mill Road waste pit site associated with our I-77 Rest Area project in Iredell County. The loss of sediment was contributed to several factors such as inadequate erosion control device function, lack of maintenance of erosion control devices, improper stormwater management, lack of slope stabilization, failure to properly perform erosion control site inspections. These factors in conjunction with significant consecutive rainfall events, which caused the saturated soil material on the fill slopes to fail and completely inundate erosion control devices, overtop the devices and perimeter measures allowing sediment to enter into UT to Patterson Creek and adjacent wetlands. Immediately upon recognition of the sediment loss, project peisonnel notified NCDOT Division Environmental Office, NCDOT Roadside Environmental Unit and Division Water Resources (DWR) of the issue and began making efforts to recover the sediment loss and repair the erosion control devices to prevent fi�rther loss. The Department suspended all operations on the project until the site could be repaired and further actions as required to recover sediment losses were addressed to the satisfaction of the Department and the Division of Water Resources. A synopsis of the event including clean up and repair efforts is attached. Additional sediment and erosion control measures have been employed in order to minimize potential for sediment losses in the future. These include the addition of diversion ditches, earthen berms along the top of fill slopes, and slope drain pipes with inlet protection and directed to basins, and check dams have been installed to properly manage the stormwater runof£ Slopes have been seeded and mulched and riparian areas stabilized using native seed mixtures. Special sediment control fence has been added along the stream as an additional effort to prevent sediment loss into the stream. Measures have also been added to aid in the recovery of the sediment from the stream such as silt trap (special �`�Nothing Compares� Sta[e of North Carolina Departmen[ of Transportation Division OPfice PO Box 47 Shelby, NC 28 L50 704-480-9020 sediment control fence) added in the stream to capture material at the project limit, wattles in the stream added to reduce turbidity downstream of the project. These measures are shown on the attached site plan. In order to ensure that proper inspection of the site is performed, the Department has reiterated to the contractor their responsibility and consequences of not properly following contract guidelines in regards to NPDES and erosion control inspections. Additionally, the Department has assigned the oversight of this inspection to a project technician with Level II erosion control and stormwater certification. This technician will be responsible for ensuring the requirements of the NPDES reports and inspections are properly and thoroughly performed. This will be accomplished through routine site inspections of the borrow site as well as the actual project site. The Department will monitor the actions of the contractor and take necessary actions including suspension of all operations in order to enforce the contract requirements and issued directives to prevent any future sediment loss. Two follow-up inspections were conducted by the Division of Water Resources, Mooresville regional Office to review and monitor the progress of the cleanup and repair. During the most recent inspection, it was determined that adequate removal of sediment within the stream and wetlands has occurred and NCDOT was directed to continue to monitor and maintain the in channel silt trap and to remove sediment as needed. Thus far, approximately 160 cubic yards of material have been reclaimed and collected sediment will be removed routinely until further guidance from DWR is provided. NCDOT will continue our maintenance and monitoring efforts and will continue to emphasize good management practices until the site is closed. Please feel free to contact me if you have questions or concerns in regards to this issue. Sinf�e'���y� by. C��. �.� DFEBA&9F405A474... Reuben Chandler, PE Division Engineer Attachments: Event Synopsis Site Plan with additional measures Pictures of Clean up Electronic Copies: Steve Kichefski, US Army Corps of Engineers, Asheville District Office Mark Taylor, PE, Resident Engineer Neil Trivette, Roadside Environmental Unit Event S,ynopsis • Contractor and NCDOT stopped all production work and mobilized to the waste site for repairs and containment. • November 14�h, Bucket brigade was employed to remove sediment loss from sensitive areas. • Additional equipment was acquired to help in the installation of basins, diversion ditches, and other erosion control devices. • November 16�", Seeding contractor installed new baffles and skimmer in basin, Prime Contractor utilized two dozers to reshape slopes in fill area, track hoe excavators to construct diversion ditches, install other basins and sediment traps. Bucket brigade was still utilized to remove material from sensitive areas. • November 17t", Contractor installed down slope drains at fill areas to ensure slope stability. Bucket brigade was still utilized to remove material from sensitive areas. • November 18t", Contractor constructed berms at top of fill sections with slope drains into basins, installed a 18' X 45' X 2' silt trap, reworked drainage area to utilize additional basin, installed/ repaired silt fence, and diversion ditches. Bucket brigade was still utilized to remove material from sensitive areas. • November 19t", 1.8" of rain fell throughout the day; a failure in sediment control fence was identified, yet contained. • November 20th, Site inspection with DWR, NCDOT, Contractor. Contractor worked on repairs and inspection from yesterday's rain event. The following instructions were issued by Ms. Hood (DWR): The flat areas are to be seeded using the native seed mix in the contract, the stream channels are to be reopened using the methods already in use, all slopes are to be seeded within the guidelines in the contract. Inspections are to be performed in accordance with the NDPES program. • November 23`a, Bucket brigade was still utilized to remove material from sensitive areas. Contractor utilized a long arm excavator working from an existing farm access road to move the material back to the waste area after it was removed from the stream. The contractor placed wattles at the lower end of the impacted area to lessen the turbidity of the stream as it leaves the project. • November 24t", Contractor worked at the lower end of the impacted area to install a silt catch as instructed just before the stream leaves the impacted area, used the bucket brigade to reopen the stream channels, and the long arm excavator and an off road truck to move the material back to the waste area. • November 25th _ 29tn, Contractor inspected/ reviewed site and elected not to work for the Thanksgiving Holiday. • November 30th, Contractor preformed inspection, yet rained 0.75 inches. • December 1 St, Contractor preformed inspection, yet rained 1.0 inches • December 2°d, Contractor performed inspection, yet rained 2.25 inches • December 3`d, Contractor's Supt. preformed inspection. Contractor forces worked to maintain erosion control measures on the project and in the Tomlin Mill Road waste site. • December 4`h, DWR, NCDOT and Contractor revisited the Tomlin Mill Waste site for an inspection. Additional cleanout out was discussed and scheduled to be performed. Special sediment control fence was approved at the tractor crossing to retain as much silt loss as possible. Contractor has placed native seed mix on impacted areas as directed. • December St�', Bucket brigade was still utilized to remove material from sensitive areas. • December 7t�', - 12t", Contractor is in the process of closing this issue. Installed special sediment control fence as per request and as approved. Contractor is monitoring all devices, doing repairs as needed, and filling out the proper NPDES reports for all sites. • December 14t", DWR, NCDOT and Contractor revisited the Tomlin Mill Waste site for an inspection. 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