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Home My WebLink About20090876 Ver 2_Email_20120301Ridings, Rob From Murray Christopher A Sent Thursday March 01 2012 4 52 PM To Alsmeyer Eric C SAW Ridings Rob Cc Billy Lee (blee @withersravenel com) (blee @withersravenel com) Lipscomb Brian S Pearson Donald R Hinnant Chadwick D Griffin Benjamin R Lauffer Matthew S Subject RE Construction issue on RSP 1 in Wake County Attachments RSP 1 Revised Permit Drawing 3 of 9 pdf Rob and Eric, I was out at the site earlier this afternoon with the hydraulic engineer and Resident Engineer We have all determined that the best option for long -term stability is to extend the rip rap bank stabilization throughout the entire footprint of Stream Site 2 This is depicted in revised permit drawing 3 of 9 The contractor proposes to transition from a 1 5 1 rip rap slope to a 2 1 rip rap slope in this area This construction revision will add 35 linear feet of permanent rip rap streambank impact at this area A review of the permits previously issued for the project indicates that the additional rip rap bank stabilization can be added as a project impact without additional notification to your agency The total streambank stabilization impacts remain below 500 linear feet Note that this activity does not result in additional riparian buffer impact Please contact me if you need further information Chris Murray Original Message From Murray, Christopher A Sent Wednesday, February 29, 2012 3 37 PM To Alsmeyer, Eric C SAW, Ridings, Rob Cc Billy Lee (blee@withersravenel com) (blee(@withersravenel com), Lipscomb, Brian S, Pearson, Donald R, Hinnant, Chadwick D, Griffin, Benjamin R Subject Construction issue on RSP -1 in Wake County Reference Maintenance repair activity at failed hydraulic pipe system and rip rap bed and bank stabilization along Wade Avenue in Wake County (TIP Project RSP 1), USACE Action ID No 2011 - 02227, DWQ Project No 20090876 ver 2 u� / ��- G� D Eric and Rob, Construction activities have commenced at Permit Sites 1 and 2,(Wade Avenue South) I was out at the project yesterday and wanted to provide you some information Issue 1 Heavy rain events on February 25 and 27, 2012 resulted in the additional loss of segments of the existing 18 inch RCP pipe structure that originates under Wade Avenue The loss of the pipe segments resulted in deposition of sediment into the Unnamed Tributary to House Creek Note that grading activity commenced Tuesday morning That the loss of sediment into the stream channel is a result of the rain events that occurred on Saturday and Monday (prior to the grading activity) 1 Issue 2 The recent loss of the pipe segments affects the ability of the contractor to install a downstream device to dewater and manage the stream during the life of the project The contractor was advised to do the following 1) Attach slope drain pipe to the two existing pipe structures to convey clean water through the work area 2) Install sand bags as a dewatering device at the tail end of the proposed in stream rock stabilization while the contractor surges fill material into the work area This will prevent loss of material beyond the permitted permanent stream impact footprint during this time frame A silt bag will also be utilized at this location 3) Remove the sand bag in the near future and install a temporary rock sediment dam (Type A) in the stream channel The Department typically does not typically install temporary rock sediment dam (Type A) in stream channels The device will be installed within the permitted permanent stream impact Note that the dam is not completely effective in preventing movement of sediment off the work limits However, this appears to be the best option due to the unstable (and dangerous) nature of the streambanks and adjacent ground Issue 3 Permit Drawing 3 of 9 depicts rip rap stabilization further downstream along the Unnamed Tributary to House Creek An evaluation of the area yesterday depicted on Permit Drawing 3 of 9 revealed unstable streambanks along a portion of the streambank that was not to be stabilized as part of this project The Department will review this area with the hydraulic engineer and determine if it is necessary to include this area as part of the streambank stabilization Further information regarding this activity will be provided to your offices later this week I wanted to provide you with this updated information Please contact me if you need further information Chris Murray Email correspondence to and from this sender is subject to the N C Public Records Law and may be disclosed to third parties 7 TND £ 9�TRAELWAY EASTBOUND ES _ E15T OF TRAVEL WAY - 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STREAM SITE IMPACT 2 N C DEPT OF TRANSPORTATION DIVISION OF HIGHWAYS WAKE COUNTY PROJECT 42188 (RSP-1) WADE AVENUE BMP BETWEEN BLUE RIDGE ROAD AND I 440 „F V, SHEET 3 OF 9 3/1/12 I 11