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Home My WebLink About20130223 Ver 7_More Info Received_20190219Carpenter,Kristi From: Sent: To: Cc: Subject: Attachments: April, Cheely, Erin K Tuesday, February 19, 2019 12:08 PM Norton, Apri) R David.E.Bailey2@usace.army.mil; Patterson, Robert D; Moon, Chris D; Thomson, Nicole J; Parker, Jerry A; Carpenter,Kristi; Dagnino, Carla S RE: Request for Additiona) Information_20130223v7 U-2524CD Modification Guilford U-2524 C_D Engineering Response.pdf; U-2524 C_D Revised Sheet 12a of 25 - Feb 2019.pdf; U-2524 C_D FEIS Mapping 1995.pdf Attached and below are responses to your on-hold request for additional information. 1. Please see the attached engineering response from Craig Lee (NCDOT Hydraulics) and Byron Moore (NCDOT Onsite Engineering) showing the calculations and reasoning for the rock size in the proposed bank stabilization and grade controls at Permit Site 4. 2. Please see the revised Sheet 12a of 25 reflecting the rock size recommendations and the addition of geotextile for added stability. 3. Please see the attached map from the 1995 FEIS marked with the location of Site 4 with respect to the project corridor. This site was within the project footprint at the time the preferred alternative (LEDPA) was selected for this project prior to buffer rules and is therefore not subject. Please let me know if you have any additional questions or need any additional information, thanks! -erin Erin Cheely Environmental Program Consultant Environmental Analysis Unit N.C. Department of Transportation 919 707 6108 office 919 323 5192 mobile ekcheelvCa�ncdot.qov 1598 Mail Service Center Raleigh, NC 27699-1598 y=�k. ��:. .k,. �� , f � : w. �. � , } :; x� � £ �� *w a�� ,��s�� `��,� ��,�,� �,� ,��.�� `�� 'J��`� �°�� .�� :�,� ��W�r �� .� �� ,��,�� :s��,�. From: Norton, April R <april.norton@ncdenr.gov> Sent: Friday, January 25, 2019 2:56 PM To: Cheely, Erin K <ekcheely@ncdot.gov> Cc: David.E.Bailey2@usace.army.mil; Patterson, Robert D <robert.patterson@ncdenr.gov>; Moon, Chris D <cdmoon@ncdot.gov>; Thomson, Nicole J<njthomson2@ncdot.gov>; Parker, Jerry A<jparker@ncdot.gov>; Carpenter,Kristi <kristilynn.carpenter@ncdenr.gov> Subject: RE: Request for Additional Information_20130223v7_U-2524CD Modification Guilford Erin, The Division of Water Resources received your application dated January 11, 2019, requesting a 401 Water Quality Certification for the subject project. The Division has determined that your application is incomplete and cannot be processed. The application is on-hold until all the following information has been addressed. 1. Please provide calculations to ensure that the rocks/boulders are appropriately sized, based on stream flow/velocity/shear stress. [15A NCAC 02B .0216] 2. It appears as though a geotextile is not proposed for stability within the rock step-down structures. If this is the case, please explain why geotextile is not proposed. [15A NCAC 02H .0506] 3. If riparian buffers are impacted, please locate all of the protected riparian buffers as overlays on the site plan, clearly showing Zone 1 and Zone 2 and enumerate all riparian buffer impacts on the site plan and clearly label impacts (Buffer Impact 1, etc.). The Division recommends highlighting by hatching or shading all impacts areas for temporary impact areas and permanent impact areas. Please keep in mind that any new buffer impacts may not fall under the previous buffer exemptions for this project. [15A NCAC 02 .0262] Please respond within 30 days in writing. Thanks, April From: Cheely, Erin K Sent: Thursday, January 24, 2019 11:27 AM To: Norton, April R <a.�a_ri.l..:_n_crrtcr_n_..C,�_n_cd_e_n_r..�crv> Cc: �7avi_d_,_�.._�a_i.l_ey�(�_usa�e_:arm�.y.:m�.%I; Patterson, Robert D <rcrk�ert.�atterscrnC�_n�d_e_n_r:.�crv>; Moon, Chris D <cdrrr�crcrn(c�_n�dcrt.:.�ca.v>; Thomson, ................................. . ......_. _ ........................................,�. Nicole J <n.�thcr_m�_scr_n�(�_n�dcrt.:.�ca.v> Subject: RE: Request for Additional Information_20130223v7_U-2524CD Modification Guilford April, I reached out to the Division with regard to your questions and below is the response I received from Chris Moon. Let me know if further information or changes are needed: 1. The As-Built plan drawing I created was based on the conversation between David Bailey and I. I wasn't given any design criteria/calculations to go by other than to draw it based on the same drawing I created for Permitted site 7. The rock size was based on: (A) What can be typically found in Class 1(sifting through loads of rock to meet the parameters in the drawing) length, width, height. (B)Trying to find flat tops and bottoms and being wide enough to meet the embedment to hold the rocks in place during heavy flow in the stream. 2. There was no geotextile utilized because it wasn't requested when it was done at site 7 so it wasn't drawn for this site as well. If it is something that needs to be incorporated we will use it. Basically I have drawn the As-Built per the agency request. If I need to mock up the drawing just let me know what I need to add. Thanks, erin From: Norton, April R <a.�a_ri.l..._nca.rtcrn_(�_n�d_e_n_r.�crv> Sent: Tuesday, January 22, 2019 9:38 AM To: Cheely, Erin K <ek�h_e_e.l.y_(�_n�dca.t...�ca.v> Cc: �7avi_d_,_�.._�a_i.l_ey�(�_usa�e_:arm�.y.:m�.%I; Patterson, Robert D <rcrk�ert.�atterscrnC�_n�d_�_�_r:.�cav> ................................. . ......_. _ Subject: Request for Additional Information_20130223v7_U-2524CD Modification Guilford Erin, Thank you for your 401 Water Quality Certification application, dated January 11, 2019. To continue the 401 Water Quality Certification review for the subject project, please provide the below additional information: 1. Please provide calculations to ensure that the rocks/boulders are appropriately sized, based on stream flow/velocity/shear stress. 2. It appears as though a geotextile is not proposed for stability within the rock step-down structures. If this is the case, please explain why geotextile is not proposed. Thanks, April April R. Norton Environmental Senior Specialist Transportation Permitting Unit Division of Water Resources NC Department of Environmental Quality 919-707-9111 office 919-710-6516 mobile a.�a_ri.l..:_nca.rtcr n_..C`_�.._n�d_e_n_r:.�.cry 512 North Salisbury Street, 12t" Floor (physical) 1617 Mail Service Center (mailing) Raleigh, NC 27699 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. I rr�7all �:urrc,��u � � � � � � � � y I�c rli��;lu�e,rl �u �C�h•ih�rl I i� ci��;e, Cu ai� rur°r7 �mii;, ;;e,i� cr i;, ;;u� ��;� �u Cmie, ,..,u� i�; ta�:ur�: ;, ..,aw ai� ir7a, I�arti��, Cheely, Erin K From: Moore, Byron G Sent: Tuesday, January 29, 2019 10:59 AM To: Cheely, Erin K; Nicole Thomson (nthomson@sepiengineering.com) Cc: Lee, Craig J; Moore, Byron G Subject: FW: Request for Additional Information_20130223v7_U-2524CD Modification_Guilford Nikki and Erin, I asked Craig Lee from hydro to look back at how the rip rap was sized for the inlet channel banks at this location (see his email below). A 50 year storm is creating a shear stress of approximately 3.4 Ib/sf. Dave Rosgen has a chart in his design book which correlates rock structure size (for cross vanes and similar structures) with bankful shear stresses. This chart is based on bankful discharges, not larger 50 year storm events. The rock size recommended for a bankful event on this chart is around 3.5 feet. So I would recommend 4 x 3 x 2 boulders at this location (which is usually the size we recommend in other places.) If 6 inch drops are required, then boulders will need to be buried. I hope this answers everyone's questions. Let me know if that works for everyone. Thanks for your help Craig. Byron From: Lee, Craig J <cjlee@ncdot.gov> Sent: Tuesday, January 29, 2019 10:34 AM To: Moore, Byron G <bgmoore@ncdot.gov> Subject: RE: Request for Additional Information_20130223v7_U-2524CD Modification_Guilford Byron, These are the reasons Class I rip rap was proposed on the inlet banks. Based on the culvert size and the existing steep banks the designer called to lay back the banks with a slope of 1.5:1 or flatter and stabilize. As shown below the shear stress and velocity are inside the ranges for Class I rip rap. Let me know if you have questions. Q10=160cfs, Q50=180cfs — For both discharges the velocity is approximately 5 f/s and shear stress 3.4 Ib/sf Allowable shear stress for Class I rip rap is 4.2 Ib/sf Typically, if velocities are less than 10 fps then Class I rip rap is adequate. Based one the photo that was attached in a previous email the Class I rip rap seems to be stable. � �� F�EM�V� - __ __�.: � ,.,; --_-- �- f"_ <,',_.; : � � � - �!'� �� UL'V.�RT �H�hJNEL Ih�4PR+�VE�"IENT� �u ��Y�� '�EE {�ETAIL �� LA�S I I�lP-RAP ESfi. �� T�JI�S E�ST. �� SYGF � �� _-� - .. � � fF � �� 1 � � - ' ..... ,, �. - ��. .., �.,.• � , : .. �,_ _ , . _ _•- - .. ' --; �t � , . , . � r .,�� i ,�- � � , r _ _ _- L -"�= �� - RE�IG1�'E �} � :�- _ - . _ ______� _ f� W Thanks, Craig J. 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