Loading...
HomeMy WebLinkAbout20161004 Ver 1_More Info Received_20161116November 14, 2016 Division of Water Resources 943 Washington Square Mall Washington, NC 27889 ATTN: Mr. Anthony Scarbraugh Dear Sir: Charles E. Holden 141 Foxx Lane Knotts Island, NC 27950 Thank you for working with me in correcting the placement of the retaining wall, from 2' away from the tree line to 30' from the tree line which would be outside of the 404 wetlands. I am enclosing corrections made on the part of the page 1 master layout of the bulkhead installation . The retaining wall will be moved back outside of the 30' wetland. From the area shown on the plans to be 2 feet from the tree line. The correction will also effect other parts of the layout which I have corrected on the project narrative sheet. This includes: reducing on paragraph 4, line 2 from 60' to 54' reducing on paragraph 4, line 4 from 690'.6" to 639.'6" reducing on paragraph 4, line 5 from 64 cu. yds to 59 cu. yds. reducing on paragraph 4, line 11 from 24" to 30' Addition on paragraph 4, line 12-14, 45' of rip rap Again, thank you very much for help in this matter. If you should have any additional questions you may contact me at (757) 646-0404. Sincerely, I" �'4jk' Charles E. Holden Note: 3 copies forwarded to: 401 & Buffer Permitting Unit, 1617 Mail Service Center Raleigh, NC 27699-1617 From: Charles and Carol Holden 141 Foxx lane Knotts Island, NC 27950 A Project Narrative: The primary purpose of this project is to stop the erosion from wind driven, north eastern, and from due east that wash water against the bank. From the time this property was subdivided around 1975 to the present time, erosion has taken away from 60' on the north end of the property line to approximately 90" on the south end with lesser amounts in the middle. This land is lost forever and now the bay is rising and the wind force which blows from the south and builds up the water level then from the north to move it back out into Currituck Sound has increased causing faster erosion. The concrete blocks which were placed along the water line facing Knotts Bay cannot slow or stop the erosion and flooding is taking place when the blocks were laid down in 1994 to now. The bay low water mark is approximately one foot higher now. That leaves an average of 16" from the top of the block to the land level. This new bulkhead will extend the height 12" which matches the existing bulkhead on the property next to us on the north end. The bulkhead would extend from the property line on the north to the property line on the south, facing Knotts Bay. Starting on the north end, concrete blocks were placed against the erosion escarpment at that time in 1994. A total of 155 blocks 15 1/2" high x 27" wide by 48" long, were placed. Over the years, strong winds have washed over the blocks causing erosion. Details of this is included on the drawings. The total length where blocks occur is 626'6". Total fill material from the proposed bulkhead to the existing erosion escarpment located on the landward side of the gravel behind the bulkhead is 226.8 cubic yards. The total surface is 4,943 square feet. The bulkhead would be placed tight against the cement blocks which would add support. Areas without these blocks, the bulkhead would be placed 12" from the erosion escarpment, filled depth 2.5' which includes 54' along the Knotts Bay side to the area where wet lands start and rip rap begins. Also, along both sides of the canal and along the end of the canal the total length of this is 639'.6". Total fill material between the bulkhead and the erosion escarpment is 59 cubic yards. The total surface is 639,5' times 1 foot out times 2.5 feet fill equals 59 cubic yards. In addition to the bulkhead we purpose to build a retaining wall along the tree line of the marsh land on the south end of the property. Water builds up in the marsh and flows out onto our grass land. In order to stop this, the retaining wall would be 12" above ground. This area of land has been determined by the USACE visit on 7/28/16, the marsh area is USACE 404 wet land that extends 30' landward of the vegetation line where the retaining wall is proposed. The wall will be constructed 30' from the vegetation line and would be a total of 264 lineal feet. No work will be done in 30' wetlands as established by the USACE personnel. Also, rip rap will be used from the area of wet land from the point where the retaining wall meets the end of the bulkhead to the property line a total of 45'. Also, with this project, a 180' long by 6' walkway with a 20' by 20' platform will be constructed. At the end four boat tie ups will be installed. The pier will be constructed from 125' from the north end property line into Knotts Bay. All salt -treated wood -2.5 CCA All bolts, nuts, washers, tie rod's — Hot dip galvanized All nails —16 D galavanized 14 b 12& CV\ -V n 14 b .CA P j oiv, 3 d� ' t-0 � SC i.� 7 4