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HomeMy WebLinkAbout20041053 Ver 2_More Info Received_20120611STV /Ralph Whitehead Associates LYNX Blue Line Extension Pro]ect Office 6 0 0 E a s t F o u r t h S t r e e t Charlotte North Carolina 28202 (704) 432 2584 fax (704) 432 2593 June 8 2012 Via FEDERAL EXPRESS North Carolina Department of Environment and Natural Resources Division of Water Quality 512 N Salisbury Street Raleigh North Carolina 27604 Attention Mr Charles Wakild P E Subject Request for Additional Information CATS Blue Line Extension Northeast Corridor Light Rail Project Individual Permit --� City of Charlotte, Mecklenburg County NC p �, Ij 7 = USACE Action I D #200901062 NCDWQ No 04 1053 Y 2• STV /RWA Project No 2513745 J �112 Dear Mr Wakild On behalf of the Charlotte Area Transit System (CATS) in cooperation with the Federal Transit Administration (FTA) STV /Ralph Whitehead Associates Inc (STV /RWA) is submitting this response to the February 14 2012 request for additional information issued by the NCDWQ STV /RWA has also incorporated the additional information that was requested by the NCDWQ as a result of the draft response review meeting held with the NCDWQ on March 15 2012 Additional design changes have been implemented subsequent to the meeting that was held with the NCDWQ based on new requirements requested by CATS and Norfolk Southern Railroad The comments submitted by the NCDWQ are provided followed by the response 1 Provide stream flow direction arrows for alljunsdict/ona/ streams within the project limits Response — As requested stream flow direction arrows have been provided for all jurisdictional streams within the project limits and have been added to all permit figures A revised set of permit impact drawings (Figures 14 through 23) is included as Attachment A 2 Clearly depict the proposed multi use path on all plan view drawings An employee owned company providing quality service since 1912 Mr Charles Wakild Page 2 Response — The multi use path is no longer part of the proposed project and has been removed from the figures (see revised Figure 19) therefore the impacts associated with the multi use path have been eliminated from the project However Norfolk Southern Railroad subsequently requested a drainage redesign that will result in new impacts to Stream P These new impacts to Stream P are unavoidable and were not previously anticipated Additional detail regarding the design changes and the new impacts to Stream P are addressed in Response to Comment # 21 3 Stream impacts of 396 linear feet (10 are proposed for Junsdictional Stream D Figure 14 does not depict where the flow from stream will be directed If the stream is being relocated to a stabilized channel details for the channel must be provided to include a clear depiction on the plan view a detail for the construction and the slope of the proposed channel (or profile drawing depicting the slope) Additionally Figure 14 depicts rock check dams throughout the stream channel DWQ does not authorize the installation of erosion control measures in active streams Response — Jurisdictional Stream D will be relocated as part of the LYNX Blue Line Extension Northeast Corridor Light Rail Project (LYNX BLE) construction A revised Figure 14 is attached The figure depicts where the stream flow will be directed as well as the components of the proposed sanitary sewer that crosses under relocated Stream D The proposed sanitary sewer manhole is depicted and the relocation section is shown as an impact to Stream C A grade control structure has been placed downstream of the sewer line on relocated Stream D to keep the stream bed at one foot over the proposed 10 sewer line Details on the proposed channel profile typical section and detail for the grade control structures are included on Figures 14a 14b 14c 14d and 14f and show the relationship of the proposed channel relocation to the existing Stream D and the LYNX BLE alignment (Note details for non standard drainage structures Ounction boxes inlets etc ) will be added to the Figure sheets upon completion of the final design plans which is anticipated to be complete in August 2013 References to these details are noted on the Figure profiles as Detail Since the details will not affect impacts to waters of the U S currently being reported it is anticipated that these drawings will be provided to NCDWQ prior to construction as a condition of the Section 401 Water Quality Certification ) Class II nprap will be used in the proposed plunge pool and the stream banks will be stabilized with coir matting that will be seeded and mulched Figure 14d depicts the typical sections and grade control structures proposed for the relocated Stream D Figure 14a provides the slope of the proposed channel and depicts the confluence with Stream C at the toe of the proposed rock drop structure (detail on Figure 14f) In regards to the erosion control measures as indicated on Figure 14 a temporary coffer dam will be placed within Stream D and a pump around operation will be used to ensure that the stream is no longer active during the construction activities All nprap will be buried below the stream bed elevation as per the note on Figure 14e A detail showing the pump and dike layout with a dewatering bag has also been included on Figure 14e The rock check dams have been removed with the exception of one located at the downstream end of the channel which will be Mr Charles Wakild Page 3 temporary in nature The single temporary rock check dam is recommended for the following reasons a With the pump around the channel will be constructed primarily in the dry b The rock check dam will provide erosion control during construction until the new channel can be fully stabilized in the event that a large storm overwhelms the dike and pump before the new channel can be fully stabilized 4 Page 15 of the application Indicates that the relocation of Junsdictiona/ Stream D will incorporate natural stream design elements These elements were not provided in the drawings Provide all appropriate stream relocation details Response — As discussed at the Section 404/401 Pre Application meeting on October 20 2011 the site constraints of the rail corridor and the surrounding topography limit the extent of natural stream design elements that may be incorporated into the relocated channel Therefore the focus for the channel relocation is to adjust the profile using grade control structures to flatten the slope and reduce channel velocities The bankfull width depth and area were established using the N C regional curves for urban streams in the Piedmont area A flood bench is incorporated in the channel section to allow larger storms access to a floodplain While not a true enhancement or restoration design the proposed design elements should allow the channel to reach a more natural stable state please refer to the additional details on the new drawings added to Figure 14d and 14f as described above in the response to comment #3 5 Figures 14 and 14a depict what appears to be a nprap pad at the end of a 72 RCP Figure 14a refers to this impact as a nprap stilling basin constructed of Class I nprap Please be advised that DWQ does not authorize the construction of stilling basins In jurisdictional streams If the impact is associated with a dissipator pad it must be labeled as such If a dissipator pad is proposed all nprap must be embedded such that low flow of water and aquatic passage are unobstructed (i a embedded below the streambed elevation) Additionally provide justification as part of the required avoidance and minimization of impacts to jurisdictional resources for the nprap pad as the proposed slope of the 72 RCP Is 0 60% (very flat) Response — The riprap stilling basin is designed as a permanent energy dissipater to reduce the erosive velocity currently experienced at the culvert outlet The term nprap stilling basin is an older term used by the Federal Highway Administration (FHWA) for what is a designed plunge pool It is not intended as a settling or treatment device for water quality or erosion control This feature will be renamed at every location in the plans to nprap plunge pool and has been renamed as such in the attached permit drawings The riprap will be placed such that the top of all rock in the stream does not exceed the bottom of the stream elevation For the pool area the riprap will be set below the stream elevation as specified at each location based on the pool depth A typical detail is included with the Figure 14 drawings The nprap basin /plunge pool has been designed using the procedures referenced on page 8 06 8 of the NCDENR Erosion and Sediment Control Planning and Design Manual ( NCDENR Manual) The NCDENR Manual references HEC 14 Hydraulic Design of Energy Dissipators for Culverts and Channels The 72 reinforced concrete pipe (RCP) at 0 6% slope Mr Charles Wakild Page 4 has an outlet velocity of 116 feet/second (fps) Using the HEC 14 procedures the nprap basin /plunge pool needs to have a pool length of 18 and an apron at the end of 6 for a total length of 24 The length of 24 is significantly less than the length (L) required for a riprap apron designed using the other methods in the NCDENR Manual as described below a SCS Method (minimum tailwater) for Q =136 cfs & D =72 L=39 b NYDOT Method for V =11 6 fps & D =72 Zone 3 — use L =8 x D= 48 6 Stream impacts of 801f are proposed for Jurisdictional Stream C One 7x7 concrete box culvert will be extended and two (2) 72 steel pipes will be installed to handle stormwater The existing 7x7 concrete box culvert is perched approximately 34 feet above the existing surface water elevation and a very large scourhole exists at the end of the culvert Neither the application nor Figure 14 or 14c depict any effort to provide stream connectivity as part of the culvert extension and new pipe installation The plans do depict a nprap stilling basin with Class 11 nprap Figure 14c depicts the outfall end of the plunge pool approximately 4 feet above the existing surface water level As stated above DWQ does not authorize the installation of erosion control measures m jurisdictional streams If a dissipator pad is proposed all nprap must be embedded such that low flow of water and aquatic passage are unobstructed (i a embedded below the streambed elevation) Additionally the applicant must investigate ways to restore stream connectivity These can include but may not be limited to the construction of floodplarn benches (and the subsequent restoration of the normal stream dimension) at the outlet of the 2 72 steel pipes the installation of a junction box at the end of the 7x7 concrete box culvert to lower the stream elevation and reduce stream and storm flow velocities inside the structure rather than using the streambed and banks as dissipation devices and /or the construction of a rock ladder Response — As requested the plans have been revised to incorporate a function box at the outlet of the existing 7 x 7 box culvert and proposed 12 x 10 precast box culvert with one section (8 long) of 12 x 12 precast box culvert (PBC) exiting the function box please refer to the revised drawings included with Figure 14 for additional detail The function box has been moved closer to the retaining wall for the LYNX BLE and reduced in size by 2 Changes to the function box as requested by the NCDWQ have reduced the Stream C impact by 8 linear feet from the 112 linear feet identified in the initial Individual Permit application to 104 linear feet in the revised design Adding the function box helps dissipate some of the energy from the multiple culvert barrels but the addition of the function box and a single section of the 12 x 12 precast box culvert at the outlet has increased the footprint of the culvert on the stream The function box (designated A4 2 JB on Figures 14 14b and 14c) is 35 x 10 with the 10 being the outside wall dimensions parallel to the flow direction of Stream C Reductions in the 10 dimension are impracticable because the flow from the 12 x 10 PBC must make two 90 degree turns to outlet through the 12 x 12 PBC The term nprap stilling basin has been replaced with nprap plunge pool please see response to comment #5 for more detail With the proposed design change the nprap basin /plunge pool has been redesigned using the procedures of HEC 14 The 12 x 12 PBC at 0 5% has an outlet velocity of 15 2 fps Using the HEC 14 procedures the nprap basin /plunge pool needs to have a pool length of 36 and an apron at the end of 12 for a total length of 48 The supporting nprap basin /plunge pool calculations are included in Attachment B (see sheet designated A4 3 EW ) Mr Charles Wakild Page 5 The HEC 14 procedures are the only design method for box culvert outlet protection in the NCDENR Manual Although the larger nprap basin /plunge pool design now h; design it represents an overall decrease in the stream ii Permit application As a result of the redesigned sanitary response to comment #7) impacts to Stream C decreased impacts now total 104 linear feet and not 112 linear feet application s more impacts than the previous ipacts from the original Individual Sewer crossing of Stream C (See overall by 8 linear feet Stream C as shown in the Individual Permit 7 Stream impacts of 32 If are also proposed for Jurisdictional Stream C as part of the wastewater utility line relocation DWQ is requesting that the applicant investigate opportunities to install an aerial crossing or install the utility line subsurface so as to avoid direct impacts to the stream Response — As requested by the NCDWQ an aerial crossing of Stream C was further evaluated and has been designed for the existing sanitary sewer as opposed to the Stream C cut proposed in the Individual Permit application This aerial crossing has reduced impacts to Stream C from 32 linear feet of impacts to 18 linear feet of impacts a reduction of 14 linear feet of impacts from what was shown in the Individual Permit application The remaining impacts to Stream C are due to the required support structures for the aerial crossing that will impact portions of the stream bank The required distance between the support structures makes this impact unavoidable 8 A bridge crossing is proposed for Jursdictional Stream F Provide a profile drawing depicting the badge support structures in relation to the stream and water surface elevation Typically bridge support structures located on or near streambanks require scour protection If scour protection is required details on the type of scour protection must be provided and any impacts associated with the scour protection must be accounted for as a junsdictional impact Response — Figure 15b has been created that depicts the profile of the bridge crossing of Stream F (Little Sugar Creek) As indicated the proposed bridge bents would be situated well outside the jurisdictional limits of Stream F Scour protection is not required for the badge support structures because the support structures have been designed with deep foundations that do not require scour protection in addition to the placement of the proposed bridge bents well outside the jurisdictional limits of Little Sugar Creek The scour protection that is required on the end bent slopes is depicted on Figure 15b 9 Figure 15 depicts a high hazard temp silt fence along the top of the streambanks Please provide a definition for high hazard temp silt fence It appears the fence is below the top of the streambank in some locations Erosion control measures must be located outside junsdictional areas Response — The high hazard temporary (temp ) silt fence is a Charlotte Land Development Standard for use near critical areas like streams A detail of the high hazard temp silt fence Mr Charles Wakild Page 6 has been added to Figure 15 All erosion control measures have been placed outside of jurisdictional areas 10 Figure 15 depicts what appears to be a nprap pad at the end of a 24 RCP The corner of the pad appears to be on the top of the streambank Provide the slope of the 24 RCP and all details associated with the riprap pad Provide information on how erosion will be prevented from stormwater discharging from the pad as it appears to be discharging at the edge of the stream Response — This pipe system has been redesigned to discharge across North Brevard Street on the downstream side of the bridge over Stream F (Little Sugar Creek) please refer to the revised Figure 15 The 30 RCP with a slope of 0 50% will discharge onto a Class II nprap apron installed outside of the jurisdictional limits of the stream in the floodplain of Stream F (Little Sugar Creek) Figure 15a has been added to depict the profile showing the 30 RCP and nprap apron Based on the 100 year water surface elevation (675 0 ) for Little Sugar Creek at the 30 RCP outfall the depth of flow at the pipe invert is 6 72 This produces a shear stress of 2 1 pounds per square foot (psf) Class II nprap can handle five pounds per square foot based on the NCDENR Manual The ordinary high water mark (OHWM) of Stream F (Little Sugar Creek) is depicted on Figure 15a to indicate that the proposed nprap apron is being installed above the OHWM The existing streambank in this area of Stream F (Little Sugar Creek) consists of grouted riprap (riprap covered with concrete) Therefore the grouted nprap streambank would not be in danger of being eroded by the stormwater outfall 11 Junsdictional Stream J is proposed to be relocated to an 11x6 PBC Please define the acronym PBC Response — PBC is defined as Precast Box Culvert 12 Figures 16 and 16a depict the installation of a nprap stilling basin constructed of Class II r1prap Please be advised that DWQ does not authorize the construction of stilling basins in junsdictional streams If the impact Is associated with a diss►pator pad it must be labeled as such If a diss►pator pad ►s proposed all nprap must be embedded such that low flow of water and aquatic passage are unobstructed (I a embedded below the streambed elevation) Additionally provide justification as part of the required avoidance and minimization of Impacts to Jurisdictional resources for the nprap pad as the proposed slope of the 11x6PBC Is 0 60% (very flat) Response —The term nprap stilling basin has been replaced with nprap plunge pool please see response to comment #5 for more detail The riprap plunge pool was designed using the procedures of HEC 14 The 11 x 6 precast box culvert at 0 6% slope has an outlet velocity of 13 9 fps Using the HEC 14 procedures the riprap plunge pool needs to have a pool length of 33 and an apron at the end of 11 for a total length of 44 Figure 16a provides a profile of the nprap plunge pool and Mr Charles Wakild Page 7 demonstrates that the nprap will be embedded below the channel bottom as will all of the proposed riprap plunge pools The supporting calculations are included in Attachment B (see sheet designated A9 5 EW) 13 Provide information as to whether the width of the proposed culvert on Jurisdictional Stream J is 11 feet or 6 feet The average normal channel width of the stream in the proposed impact area is approximately 5 feet If the proposed culvert width is 11 feet provide information on how you propose to maintain the normal stream dimension (approximately 5 feet) at the inlet and outlet ends of the culvert Response — The proposed precast box culvert (PBC) is 11 wide by 6 high At the outlet of the 11 x 6 PBC the channel section at the beginning of the nprap plunge pool will be 12 wide The riprap plunge pool is 44 long and the transition from the 12 width to the existing channel width of 5 will occur over this distance The plunge pool will be transitioned back into the stream as depicted on Figure 14f detail entitled Rip Rap Plunge Pool at 11 x 6 Box Culvert (A9 5 EW) 14 Figure 16 depicts a 15 RCP discharging to the 11x6 PBC which will be conveying Jurisdictional Stream J Is the 15 RCP conveying stormwater directly to the stream DWQ discourages the direct discharge of stormwater to junsd►ctional streams Provide information that the stormwater will be treated prior to discharge (► a grassed swales) or why treatment is not feasible in this location Response — Please note that the design has been changed on Figure 16 since the submittal of the Individual Permit application based on the relocation of Signal House #13 The proposed access driveways to the Duke Energy substation and Signal House #13 have been consolidated into the single driveway that is now shown on Figure 16 This design change was necessary because the relocation of Signal House #13 no longer required the Signal House #13 access road that was depicted on the impact maps submitted for the Individual Permit application The elimination of the Signal House #13 access road reduced the amount of asphalt driveway and replaced most of the previously proposed pipe with grassed swales (as per NCDWQ s suggestion) that provide stormwater treatment prior to discharging to Stream K The 15 RCP under the single driveway still remains however the overall pipe length has been reduced by the replacement of the pipe with grassed swales 15 Provide the proposed pipe size (and flow direction) on Figure 17 This pipe will be conveying Jursdictional Stream N and water from Wetland Y Response — As requested Figure 17 has been revised to show the flow direction and size of all pipes An additional 21 linear feet of impact to Stream N has been identified resulting from additional grading in the area of the light rail tracks This additional impact has been identified and included on Figure 17 The slopes for the proposed embankment for the light rail tracks have a footprint of disturbance that extends over the daylighted portion of Stream N (which is primarily piped through this area) increasing the impacts to Stream N from the 56 linear feet of impact that was identified in the Individual Permit application to 77 linear feet which is the entire length of the daylighted (unpiped) portion of Stream N Mr Charles Wakild Page 8 16 Figure 17 depicts a pipe north of Wetland Y that flows into the pipe which conveys Jurisdictional Stream N Is this pipe existing or proposed*2 Is the pipe conveying stormwater directly to the pipe that conveys Stream N*2 DWQ discourages the direct discharge of stormwater to jurisdictional streams Provide Information that the stormwater will be treated prior to discharge (I a grassed swales) or why treatment Is not feasible In this location Response — The pipe to the north of Wetland Y is an existing 36 RCP that will remain The existing 36 RCP flows away from Wetland Y to the north The close proximity of the building at 3162 Cullman Avenue to the limits of the embankment fill restricts the ability to incorporate a grass swale For additional detail please refer to the drainage system profile shown on Figure 17a 17 Figure 18 depicts a nprap pad at the outlet of the proposed culvert on Junsdictional Stream A (perennial) No detail has been provided for the nprap pad The nprap pad is not depicted on profile drawings Figure 18a and Figure 18b Additionally provide justification as part of the required avoidance and minimization of Impacts to jurisdictional resources for the nprap pad as the proposed slope of the 11x6 PBC is 0 69% (very flat) Response — Note This design has changed since the 3/15/12 meeting with the NCDWQ based on comments received from Norfolk Southern Included with Figure 18 are profiles (Figure 18a and 18b) showing the details of the nprap plunge pools A 10 x 7 reinforced concrete box culvert (RCBC) is now shown on the Figure 18 The RCBC does not affect the length of impact for Stream A however the nprap plunge pool length increases from 34 to 41 The 10 x 7 box culvert has a slope of 0 73% and an outlet velocity of 15 5 fps Using the HEC 14 procedures the nprap basin /plunge pool needs to have a pool length of 30 and an apron at the end of 11 for a total length of 41 The supporting calculations are included in Attachment B (see sheets designated All 3 3 EW and Al 7 EW) 18 Figure 18 depicts a nprap pad at the outlet of the proposed culvert on Jurisdictional Stream A (Intermittent) No detail has been provided for the nprap pad on the plan view drawing nor has a profile drawing with the slope been provided for the 8 6 PBC which appears to discharge to the nprap pad Additionally provide justification as part of the required avoidance and minimization of impacts to jurisdictional resources for the nprap pad (as well as the proposed slope) Response — Included with Figure 18 is a profile (Figures 18b and 18c) showing the proposed 8 x 6 precast box culvert (PBC) with the riprap plunge pool at the outlet The last run of the 8 x 6 PBC has a slope of 0 99% and an outlet velocity of 14 3 fps Using the HEC 14 procedures the nprap plunge pool needs to have a pool length of 24 and an apron at the end of 8 for a total length of 32 The supporting calculations are included in Attachment B (see sheet designated A14 7 EW) The 8 x 6 PBC and a 72 RCP discharge directly upstream of the dual 72 steel pipes which will create significant turbulence in this area Therefore the riprap dissipater for the 8 x 6 PBC Mr Charles Wakild Page 9 was extended approximately 20 to the inlet of the dual 72 steel pipes to protect the channel from erosion and prevent stability issues The 20 of nprap impacts were accounted for in the original permit application submittal 19 Figure 18 does not clearly depict the impacts to Jurisdictional Stream A (intermittent) It appears that the flow from Jurisdictional Stream A (intermittent) and Jurisdictional Wetland A is being split in a 8 6 PBC with some flow being directed to Jurisdictional Stream A (perennial) and some flow being directed to drop inlet and some other unlabeled pipe Provide information why the flow is being split and where the portion of flow that is directed to the drop inlet is ultimately being conveyed Response — Figures 18b and 18c show the profile of the 8 x 6 PBC and the location of the grass swale Stream A (intermittent) and the 8 x 6 PBC both drain to the west to the inlet of the dual 72 steel pipes The grass swale over the 8 x 6 PBC splits flow directions near the high point of Davidson Street but the swale is intercepted by inlets that direct flow back to the west through the 8 x 6 PBC Stream A (intermittent) and Wetland A will be completely filled in by the LYNX BLE construction as shown in Figures 18a 18b and 18C which have been added to the figure set for additional reference 20 Figure 18b depicts one of the two (2) 72 steel pipes being installed at an elevation approximately three (3) feet higher than the main /low flow pipe DWQ requests that the applicant investigate an alternative method for discharging stormwater from the pipe rather than a three (3) foot drop down onto nprap (if that is what is being proposed) Response — Figure 18b has been revised due to comments received from Norfolk Southern requesting a redesign Norfolk Southern did not want to maintain the additional piping that was initially proposed in the Individual Permit application The dual 72 steel pipes shown are actually at the upstream end of the 72 pipes These pipes were installed by others under the Norfolk Southern railroad by hack and bore technique It appears that the bore began with both pipes approximately 1 apart vertically at the downstream end but the pipes became about 3 apart at the upstream end The LYNX BLE project is now left to extend what was previously installed please refer to Figure 18a to see the profile of the dual 72 pipes At the outlet end there will be only a 1 vertical separation of the two pipes please note that the design in this area has been revised to address recent comments from Norfolk Southern Railroad Norfolk Southern Railroad is requiring that a single box culvert be used instead of the dual 72 pipes at the pipe bend on Figure 18 Norfolk Southern Railroad is concerned that debris may be caught between the 2 pipes at the bend and Norfolk Southern Railroad required a single box culvert to address this concern A 10 x 7 reinforced concrete box culvert (RCBC) is now shown on the Figure 18 The RCBC does not affect the length of impact for Stream A however the nprap plunge pool length increases from 34 to 41 Additional design changes for this area are described below o Norfolk Southern Railroad stated that the direct discharge of the 15 RCP to the ditch adjacent to the Norfolk Southern Railroad freight tracks will not be allowed Currently Mr Charles Wakild Page 10 runoff from the freight tracks drains down a large fill slope towards Stream A Norfolk Southern Railroad insists that this drainage pattern be maintained Therefore a new pipe and endwall (See Figure 18 A13 6 EW) is proposed to intercept the ditch between the LYNX BLE and Norfolk Southern Railroad freight tracks and direct flow back to Stream A This will maintain the existing drainage patterns in this area o The ditch along the north side of the railroad right of way was too steep ( -30 %) as it discharged near the endwall (See Figure 18 A13 3 EW) Rather than use a concrete swale with excessive velocity to discharge into Stream A a 36 corrugated steel pipe (CSP) system has been added on the north side with a Junction box used to flatten the outlet pipe slope The plunge pool for the 10 x 7 box culvert described above will be adequate for this pipe outlet as well 21 Stream impacts of 1 666 If are proposed for Junsdictional Stream P Figure 19 does not depict where the flow from stream will be directed If the stream is being relocated to a stabilized channel details for the channel must be provided to include a clear depiction on the plan view a detail for the construction and the slope of the proposed channel (or profile drawing depicting the slope) Response - As requested stream flow direction arrows have been provided for all Jurisdictional streams within the project limits have been added to all permit figures Jurisdictional Stream P flows from east of Sugar Creek Road to the east along the proposed LYNX BLE alignment The proposed LYNX BLE construction has been revised since the submittal of the Individual Permit application and will now fill only a portion of the existing stream (currently 1 564 linear feet of impact instead of the 1 666 linear feet of impact proposed in the Individual Permit application) due to the removal of the multi use path from the project and the redesign of the drainage in the area as requested by Norfolk Southern Norfolk Southern Railroad expressed concern about the length of the pipe run between the Norfolk Southern Railroad freight tracks and the LYNX BLE tracks The pipe system would be difficult to construct and maintain within the embankment of an active freight line Therefore the pipe system was eliminated from the drainage design The proposed drainage redesign includes a grass swale between the freight tracks and the LYNX BLE alignment The runoff is intercepted by culverts under the LYNX BLE that convey runoff to the north side of the railroad right of way These culverts allow the existing drainage patterns to be maintained with the exception of a minor diversion of 0 3 acre Most of Stream P falls under the proposed tracks for the LYNX BLE and will be filled Portions of the Stream P branches along the north side of the railroad right of way will remain undisturbed and these short segments are labeled on Figure 19 Stream P is relocated behind an existing building near Station 1188 +00 left Due to the constraints of the existing building and the proposed retaining wall there is not sufficient room to add a flood bench for Stream P Therefore a trapezoidal grass swale with coconut fiber matting and a 6 bottom width is proposed and no plastic netting will be used as stream channel lining The detail labeled Typical Section for Channel Al 17 D (Stream P) on Figure 14d depicts the proposed channel Grade Control Structures are proposed to flatten the channel slope and Mr Charles Wakild Page 11 avoid the need for a riprap lining Riparian seeding can be proposed for this channel as long as woody vegetation is not included Woody vegetation would increase the Manning s n values and increase the flooding potential for the adjacent building A coffer dam with a pump around is proposed for this channel construction (see detail on Figure 14e) 22 Figure 19a depicts what appear to be two (2) — 30 RCPs at the outlet of a 72 steel pipe Are these pipes conveying stormwater directly to a stream*2 DWQ discourages the direct discharge of stormwater to Jurisdictional streams Provide information that the stormwater will be treated pnor to discharge (i a grassed swales) or why treatment is not feasible in this location Response — Due to the redesign in this area that was necessary after the removal of the multi use path and the comments received from Norfolk Southern Figure 19 and the associated profiles are completely different from the originally submitted plans Grassed swales have been added as recommended by the NCDWQ However in referencing the old Figure 19d the 30 RCP was on the left side of the LYNX BLE and the 48 RCP was on the right side of the LYNX BLE (between the LYNX BLE and the Norfolk Southern tracks) The riprap apron was for the 30 RCP The 72 pipe connects to an existing 48 pipe system 23 Stream impacts of 44 if are proposed for Jurisdictional Stream Z Figure 20 depicts this impact as what appears to be an energy dissipator pad (unlabeled) and an unidentified shaded area of impact (no explanation provided) Venfy what the Junsdictional impact is and why it is necessary Response — The existing 3 x 3 masonry box culvert under the Norfolk Southern railroad is being replaced by a 54 steel pipe that will be installed by jacking and boring The 54 steel pipe will be installed on a new alignment to allow the box culvert to remain in service until the 54 pipe is complete This will require realignment of the channel just downstream of the proposed 54 pipe as shown on the plan and profile The stream impact now totaling 50 linear feet is associated with the proposed riprap plunge pool (23 linear feet) and the minor channel realignment (27 linear feet) please refer to the detail labeled Typical Section for Channel A21 8 D (Stream Z) on Figure 14d The bank full width depth and area were established using the N C regional curves for urban streams in the Piedmont area A flood bench is incorporated in the channel section to allow larger storms access to a floodplam While not a true enhancement or restoration design the proposed design should allow the channel to reach a more natural stable state In addition the 54 pipe outlet has been raised some to allow the channel to tie in more quickly and reduce the impacts to Stream Z As directed by the NCDWQ during the March 15 2012 meeting with Polly Lespinasse since elements of natural channel design have been incorporated into this intermittent channel relocation the 27 linear feet of impact to Stream Z associated with the channel realignment is no longer being considered in the mitigation calculations for the project This difference in total stream impacts versus the stream impacts requiring mitigation is detailed in Table 4 Mr Charles Wakild Page 12 24 Figure 20a refers to the nprap impact as a riprap stilling basin constructed of Class 11 nprap Please be advised that DWQ does not authorize the construction of stilling basins In Jurisdictional streams If the impact ►s associated with a d►ss►pator pad it must be labeled as such If a diss►pator pad is proposed all riprap must be embedded such that low flow of water and aquatic passage are unobstructed (I a embedded below the streambed elevation) Additionally provide justification as part of the required avoidance and minimization of impacts to junsd►ctional resources for the nprap pad as the proposed slope of the 54 steel pipe (conveying an Intermittent stream at 164%) Response — The term nprap stilling basin has been replaced with nprap plunge pool please see response to comment #5 for more detail The nprap plunge pool was designed using the procedures of HEC 14 The 54 steel pipe at 164% slope has an outlet velocity of 15 8 fps Using the HEC 14 procedures the riprap plunge pool needs to have a pool length of 15 and an apron at the end of 8 for a total length of 23 The supporting calculations are included in Attachment B (see sheet designated A21 8 EW) 25 Figure 20 depicts a culvert (unknown size) being plugged with flowable fill and abandoned Is this culvert currently conveying Junsdict►onal Stream Z? If so It appears that some channel realignment may be required to convey the stream at the outlet end of the new 54 steel pipe to the existing stream channel If channel realignment is required a detail must be provided depicting the realignment Response — The existing culvert is a 3 x 3 masonry box culvert and does currently convey Jurisdictional Stream Z Figure 20 has been revised to label this culvert In addition the channel will be realigned to convey Jurisdictional Stream Z at the outlet end of the 54 steel pipe using the Trapezoidal Channel detail shown on Figure 14d which includes a note indicating that the channel will be lined with 100% coir fiber matting in order to avoid plastic netting being used The channel will have a bottom width of 6 2 1 side slopes and a depth of 4 5 26 Figure 20 depicts what appears to be rock check dam in the junsdict►onal stream DWQ does not authorize the installation of erosion control measures in active streams Response — The rock check dam was intended to provide protection of the downstream channel during the minor channel realignment work However it has been removed from Stream Z on Figure 20 as requested 27 Figure 20 depicts an arrow with a label ( A21 8 D ) in Junsd►ctional Stream Z No Information is provided for this label Additionally it appears some sort of easement is proposed for the stream as a box with the label SDE is located around a portion of the stream Provide information related to any easements on the stream Response — A21 8 D was the label for the proposed channel relocation The label A21 8 D stands for Segment A plan sheet 21 drainage feature # 8 and the D denotes a proposed ditch and additional information for this feature is on Figure 20a The stream has now been redesigned to incorporate natural channel design elements Notes have been added to Figures 20 and 20a for clarity Regarding the easement it has been changed to — e — to denote a temporary construction easement Mr Charles Wakild Page 13 28 Figure 21 depicts two (2) pipes with what appear to be d►ss►pator pads at their outlets The pipes are a 30 RCP and a 60 RCP According to the scale provided the dIss►pator pad from the 60 RCP is located approximately 20 feet from Jurisdictional Stream E Discharges from stormwater outfalls can lead to stream and stream bank destabilization Therefore provide details for both dissipator pads a map depicting the topography of the area where the dissipater pads will be constructed (should be close to flat) and the proposed slopes of the 30 and 60 RCPs Response — The revised Figure 21 now depicts a revised drainage system with the 30 inch and 60 inch pipes being connected before discharging to a single dissipater pad in the upland area proximal to Stream E As the topography indicates the area between the dissipater pad and Stream E is close to flat and no stream bank destabilization is anticipated This dissipater pad has been designed to meet the requirements of the City of Charlotte s SWIM Buffer regulations when discharging directly into a stream and is based on the velocity of the water in a pipe flowing full with a tail water of 0 2 times the pipe diameter in feet The velocity of the discharge at the end of the selected nprap gradation for the dissipater pad meets the allowable velocity for the soil conditions at the end of the dissipater pad based on NCDOT nprap gradation specifications The City of Charlotte calculation requirements are based on Army Corps of Engineers Reports H 70 2 H 72 5 and NJ Standards for Soil Erosion and Sediment Control 29 A badge crossing is proposed for Jurisdictional Stream U Provide a profile drawing depicting the bridge support structures in relation to the stream and water surface elevation Typically badge support structures located on or near streambanks require scour protection If scour protection is required details on the type of scour protection must be provided and any impacts associated with the scour protection must be accounted for as a jurisdictional impact Response — As depicted on Figure 22 and the attached Civil Plans (Sheets CIV C BR013 through BR016 in Attachment A) riprap scour protection is not required for the bridge support structures around Stream U (Toby Creek) Scour protection is not required for the bridge support structures because the support structures have been designed with deep foundations that do not require scour protection 30 Provide a copy of the stormwater management plans for all proposed park and ride facilities Response — The draft Stormwater Management Plans were provided to NCDWQ on March 15 2012 As discussed at the Section 404/401 Pre Application meeting on October 20 2011 the stormwater management plans for the park and ride facilities will be prepared as part of Final Design Based on previous discussions with NCDWQ and Charlotte Land Development Services (LDS) the stormwater management plans will be reviewed and approved by LDS under Charlotte s Post Construction Controls Ordinance Draft copies of the stormwater management plans for the Sugar Creek JW Clay Blvd University City Blvd and Old Concord Road stations park and ride facilities were provided to the NCDWQ on March 15 2012 it is anticipated that a copy of the final stormwater management Mr Charles Wakild Page 14 plans and /or approval will be provided to the NCDWQ as a condition of the 401 Water Quality Certification prior to construction 31 Page 18 of the application states that mitigation for stream impacts will be provided by the Charlotte Umbrella Stream and Wetland Mitigation Bank (Umbrella Bank) It also states that the acceptance letter is included in Attachment E The letter provided in Attachment E states that The Umbrella Bank does not currently have enough credits to cover this request however pending credit releases will adequately cover the request DWQ will not issue a 401 Water Quality Certification authorizing stream impacts without a letter from the Umbrella Bank and /or the Ecosystem Enhancement Program (EEP) indicating that the required mitigation can be provided Response — Jarrod Karl administrator of the Charlotte Mecklenburg Stormwater Services Charlotte Umbrella Stream and Wetland Mitigation Bank has provided a new mitigation acceptance letter with a statement that credits are available (See Attachment C — Mitigation Acceptance Letter) The letter details mitigation credits available up to 3 268 linear feet based on design revisions total stream impacts for the project that require mitigation now total 3 241 linear feet 32 Page 28 of the application indicates that heavy equipment will be prohibited from operating in the stream channels without appropriate measures Please be advised that DWQ prohibits the use of heavy equipment in stream channels without prior authorization Response — No heavy equipment will be operated within jurisdictional stream channels for the construction of this project Additional Impacts Additional impacts not previously presented in the Individual Permit application have been identified These additional impacts have been incorporated into the figures included in Attachment A as well as the impact and mitigation tables included in Attachment D As part of the LYNX BLE construction 36th Street will be lowered to allow both the LYNX BLE and the Norfolk Southern freight tracks to be grade separated from 36th Street to improve pedestrian and vehicular safety Lowering 36th Street will require the replacement of the existing drainage system The existing pipe system discharges directly into Little Sugar Creek at the downstream end of the existing double 9 x 10 concrete box culvert at 36th Street (see newly included Figure 23 in Attachment A) The existing pipe outlet is approximately 5 above the existing stream bed The new 48 RCP outlet will discharge to Little Sugar Creek at approximately 1 0 above the stream bed elevation The 48 RCP at 0 89% slope has an outlet velocity of 10 8 fps Using the HEC 14 procedures the riprap basin /plunge pool needs to have a pool length of 12 and an apron at the end of 4 for a total length of 16 The supporting calculations are included in Attachment B (sheet designated Al2 15 EW) Mr Charles Wakdd Page 15 The Individual Permit impact tables and mitigation tables have also been revised to reflect the changes to the project design as requested by NCDWQ and Norfolk Southern Railroad and are included on Attachment D Initial impact calculations presented in the Individual Permit application determined that stream impacts totaling 3 312 linear feet were anticipated Subsequent revisions to the design have reduced stream impacts to 3 268 linear feet a reduction of 44 linear feet Additional fill sods and concrete amounts will be required (5 205 CY sod is now required an increase of 110 CY 191 CY of concrete is now required an increase of 11 CY) A reduction in nprap stone was determined (250 CY nprap is now required a decrease of 40 CY) We trust that the above responses adequately address your concerns associated with the Individual Permit Application for the subject project dated December 21 2011 as well as the follow up meeting that was held on March 15 2012 in the Mooresville regional office of the NCDWQ and that the permit application review will be re activated upon your receipt of these responses However if you have any additional questions or concerns please do not hesitate to contact either of the undersigned at 704 372 1885 Sincerely STV/ PH WHITEHEAD ASSOCIATES Brandon Phillips C H M M Sr Environmental Specialist Attachment A — Figures Attachment B — Calculations Attachment C — Mitigation Acceptance Letter Attachment D — Impact and Mitigation Tables cc Kelly Goforth CATS Amanda Jones USCOE Karen Higgins NCDWQ Sonia Carrillo NCDWQ Polly Lespinasse NCDWQ David Wainwright NCDWQ Isaac Hinson CSWS 0 Michael A lag o P W S Senior Scientis Northeast Corridor Light Rail Project - Response to NCDWQ ATTACHMENT A FIGURES LYNX Blue Line Extension II I I I I 4 o U II II jj 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= - x @ «— o V— o (D ± o § � 2 >� a @ _ w $ o o _ p __ o o Q _ o m Q E m_ Q 2 o 2- - ® 2 ■ > > a _ _a g o= Q= /� c- � U ƒ m 2 7 2 a% 0 2 °ƒ @// t a o 5\ § w 2 I d� _f c ���) CL E Northeast Corridor Light Rail Project — Response to NCDWQ ATTACHMENT C MITIGATION ACCEPTANCE LETTER LYNX Blue Line Extension Ghartotto- bfocklenburg STORM 600 E Fourth Street 1 =T�m�1j� Charlotte NC 28202 ,�' �Y ( R Fax 704 336 6586 Services May 25 2012 Brandon Phillips STV/Ralph Whitehead Associates 1000 West Morehead Street Suite 200 Charlotte NC 28208 5358 Subject Protect CATS Blue Line Extension HUC# 03050103 The purpose of this letter is to notify you that the Charlotte Mecklenburg Storm Water Services (CMSWS) is willing to accept payment for stream impacts associated with the subject project Please note that the decision by CMSWS to accept the mitigation requirements of this project does not assure that this payment will be approved by the U S Army Corps of Engineers or the North Carolina Division of Water Quality 401/Wetlands Unit It is the responsibility of the applicant to contact these agencies to determine if payment to CMSWS for impacts associated with this project is appropriate This acceptance is valid for 1 year from the date of this letter The following documents must be submitted to CMSWS within this time frame for this acceptance to remain valid 1 404 Perrmt Verification 2 401 Water Quality Certification 3 Executed Departmental Transfer Invoice (DTI) between the Charlotte Area Transit System and Storm Water Services detailing the use of and payment for the credits described in the table below Based on the information supplied by your office the stream and wetland credits that are necessary to satisfy the compensatory mitigation requirements for this project are detailed in the table below The total mitigation credits available for this project are also indicated in this table The stream and wetland mitigation will be provided as specified in the Section 404 Permit or corresponding 401 Water Quality Certification for impacts associated with the subject project in Hydrologic Unit 03050103 of the Catawba River Basin The mitigation will be performed in accordance with the Agreement to Establish the City of Charlotte Umbrella Stream and Wetland Mitigation Bank in Mecklenburg County North Carolina dated June 16 2004 If you have any questions or need additional information please contact me at (704) 432 0966 or 1karl(&charlottenc gov Sincerely l 1� Jarrod JJ 'Karl Mitigation Administrator cc File To report pollution or drainage problems call 311 http / /stormwater charmeck org ll Ull.l rl " 13 Stream (linear feet ) Wetlands (acres) Credits Requested for This Project 3 268 N/A Credits Available for This Project 3,268 N/A The stream and wetland mitigation will be provided as specified in the Section 404 Permit or corresponding 401 Water Quality Certification for impacts associated with the subject project in Hydrologic Unit 03050103 of the Catawba River Basin The mitigation will be performed in accordance with the Agreement to Establish the City of Charlotte Umbrella Stream and Wetland Mitigation Bank in Mecklenburg County North Carolina dated June 16 2004 If you have any questions or need additional information please contact me at (704) 432 0966 or 1karl(&charlottenc gov Sincerely l 1� Jarrod JJ 'Karl Mitigation Administrator cc File To report pollution or drainage problems call 311 http / /stormwater charmeck org ll Ull.l rl " 13 Northeast Corridor Light Rail Project - Response to NCDWQ LYNX Blue Line Extension ATTACHMENT D IMPACT AND MITIGATION TABLES C H m d lC c.i � d � O = J H d L C w v CL Cm E E m V c , Y O Z, O rl O O O O O (0 O O (0 C. 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Z O p O ° to +(D �O r �� ao t co l+ 0 �O �M d CZ o� -; °� 2— � C �� C �� N pr °r C g� U)N NOSo� 7 7 r 7 C m 7 .m.. 7 m 7 e- 7 r 7 7 y 7 O N V U LL O (L O Il. � LL Z 11 a lL O lL Lm O LL a lL U lL ~ IL U) m m m vi iA m cn E E Cn cn E E m m J N U) m c C 03 L U E 03 N y N 7 f0 C N L �O m U C O f0 O) E c >O U Z N L O m c O m _0 01 c 7 Q N y U E , CU a2? E� cu N (Ep r� C U 03 (O w a -CU E m w °) o 0 0 U c O ao E .o E m N � O) � C 0) w L 0 L (D m L r c 0 O (D Zv