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Home My WebLink About20011551 Ver 5_Monitoring Report_20130429o l- ass t Y S The Catena 410 -B Millstone Drive Group Hillsborough, NC 27278 `� (919) 732 -1300 April 25, 2013 NC DWQ, 401/Wetlands Unit 1650 Mail Service Center Raleigh, NC, 27699 -1650 Subject: Post Construction Monitoring Report #1 and As -Built Plans, NCGC, Mount Airy, Surry County, North Carolina References: Permit No: SAW- 2011 -01765 The Catena Group, Inc. (Catena) has been retained by the North Carolina Granite Corporation (NCGC) to conduct post construction monitoring of the natural structures installed under the above referenced permit. Please find enclosed the Post Construction Monitoring Report #1 as required in Special Condition E of the 404 permit and Conditions 3 and 4 of the 401 Permit. Flow in the side channel and structure stability both meet or exceeded permit requirements. The next monitoring period is scheduled for August of 2013. If we can provide any additional information or if you have any questions, please contact me at 919- 732 -1300 (office) or 919- 417 -8027 (mobile). Sincerely, The Catena Group, Inc. �6V 6.0,0- Michael G. Wood, NCLSS President Enclosures: Post Construction Monitoring Report #1 As -Built Plans CC: Carlos Goad North Carolina Granite Corporation P.O. Box 151 Mount Airy, NC 27030 �t.;zk VIE Do APR 292013 f band ..4 I'ti— uuuin Post Construction Monitoring Report #1 North Carolina Granite Corporation Hydrologic Flow and Function of Side Channel Monitoring In- Channel Structure Stability Monitoring Mt. Airy, North Carolina Prepared for: North Carolina Granite Corporation P.O. Box 151 Mount Airy, NC 27030 Tel: (336) 786 -5141 April 2013 Prepared by: &%%The Catena Group The Catena Group 410B Millstone Drive Hillsborough, NC 27278 Tel: (919) 732 -1300 Table of Contents 1.0 Introduction ........................................................................................... ............................... 1 2.0 Methodology ......................................................................................... ............................... 1 2.1. Hydrologic Flow and Function of Side Channel Monitoring ........... ............................... 1 2.2. In- Channel Structure Stability Monitoring ....................................... ............................... 2 3.0 Results and Discussion ......................................................................... ............................... 2 Appendix A — Figures Appendix B — Photos Appendix C — Raw Data Sheets i°r1e1r�� -- NCGC Monitoring Report #I April 2013 Catena Job# 4159 Page i _ ..111L- 1.0 INTRODUCTION The North Carolina Granite Corporation (NCGC) received a 404 Permit (SAW- 2011 - 01765) on September 5, 2012, and a 401 Permit (Certification No. 3936) on July 30, 2012, authorizing impact to 265 linear feet of the Ararat River through the placement of 1,680 cubic yards of granite to stabilize river banks while also deflecting flow toward the intake of the holding pond. In addition, after -the -fact authorization was given for an additional 600 cubic yards of permanent fill for river bank reconstruction. To maintain flow in a side channel, a 2 -inch PVC pipe was installed providing water from the Ararat River to the side channel. Both permits were modified in February 2013, to allow a closed inlet structure between the Ararat River and the holding pond. The 404 and 401 Permits both included Special Conditions that must be met for the permits to be valid. Specifically, Special Condition E of the 404 Permit and Condition 3 of the 401 Permit require that the side channel receiving the flow from the 2 -inch PVC pipe be monitored biannually, each February and August, for two years following construction of the stream structures. Hydrologic flow /function will be monitored to determine if the side channel still provides habitat for aquatic life propagation and maintains biological integrity — indicated by a measured flow of greater than 26,500 gallons /day. In addition, Condition 4 of the 401 Permit requires biannual monitoring of the in- channel structures to insure stability. 2.0 METHODOLOGY On March 28, 2013, Kate Montieth and Tom Dickinson of The Catena Group ( Catena) monitored the site by walking the length of the side channel. Photo stations were established to document current conditions (Appendix B). 2.1. Hydrologic Flow and Function of Side Channel Monitoring Flow or stream discharge in the side channel was measured at two locations (Appendix A: Figure 1) using a Global Water flow meter (Model FP 111). Flow was calculated using the following formulas and measurements taken in the field: • Flow (stream discharge) = Q • Q = velocity (ft/sec) * area (ft) • Area = width of stream (ft) * depth of stream (ft) At each location, stream width was divided into equal intervals and flow (velocity) was measured at each interval; raw data sheets are in Appendix C. Using the above formulas, flow was calculated for each location. NCGC Monitoring Report #I April 2013 Catena Job# 4159 Page 1 2.2. In- Channel Structure Stability Monitoring The main channel of the Ararat River was walked from below the lower structure (double drop cross vane) upstream to the second flood gate above Linville Road (SR 1727). Structures were visually inspected from the bank and photos were taken at four photo points (Appendix A: Figure 1 and Appendix B). 3.0 RESULTS AND DISCUSSION Flow at the two locations in the side channel measured 92,423 gal/day at the lower cross - section and 71,957 gal/day at the upstream cross - section. Conditions of the permit require measured flow to be a minimum of 26,500 gal/day. Therefore, as of this initial monitoring period, Special Conditions E and 3 have both been met and exceeded. Construction of the in -stream structures was completed on March 15, 2013. Inspection of the structures at this time did not indicate any instability therefore Condition 4 of the 401 Permit has been met. —. a.1.. NCGC Monitoring Report #1 April 2013 Catena Job# 4159 Page 2 NCGC Monitoring Report #I Catena Job# 4159 Appendix A: Figures April 2013 Page 3 ^� 1 Single Wing Deflector ` W -weir t t 1 Double Drop Cross Vane i 4 Cross- Section #2 t Cross - Section #1 U Cross Section Location MPhoto Point Location The North Carolina Granite Corporation Date: April 2013 Figure Catena Scale Post - Construction Monitoring o ao 80 Feet I l Group March 2013 Job No.: Surry County, North Carolina 4159 Appendix B: Photos NCGC Monitoring Report #1 April 2013 Catena Job# 4159 Page 5 Hydrologic Flow and Function of Side Channel Monitoring Photo Station 4: Side Channel enters Ararat at left of photo (yellow arrow) Cross - Section 1 Cross - Section 2 Side channel at nexus with Ararat River Cross - Section I Cross- Section 2 NCGC Monitoring Report #1 April 2013 Catena Job# 4159 Page 6 Side Channel upstream of Cross - Sections In- Channel Structure Stability Monitoring Photo Station 1: Looking Downstream at structures in Ararat from bridge over Linville Road (SR 1727) Photo Station 1: Looking Downstream at structures in Ararat from bridge over Linville Road (SR 1727) NCGC Monitoring Report #I April 2013 Catena Job# 4159 Page 7 Photo Station 2: NCGC intake structure with flood gate Photo Station 3: Installed W -weir Photo Station 2: Single Wing Deflector NCGC Monitoring Report #I Catena Job# 4159 _W x:: _ Photo Station 2: Installed W -weir and intake structure Photo Station 3: Installed Double Drop Cross Vane Downstream Flood Gate April 2013 Page 8 Upstream Flood Gate NCGC Monitoring Report #1 April 2013 Catena Job# 4159 Page 9 Appendix C: Raw Data Sheets NCGC Monitoring Report #I April 2013 Catena Job# 4159 Page 10 Date: Z 1 Job: N L Investigators: rQ (s M Site' C in aa.,n I( A r l G Vvt Wetted Width (ft): 2- Interval Width (ft): 4 Depth units (circle): Feet OR Inches wetted WWth ss WW totem1 width oeom of now mpsurcment Site: - L7 42 o f II k\ i( t,) w i n es Ut Wetted Width (ft): Depth units (circle): Feet OR Inches interval Width (ft): ¢ i o -t ,$ I,2 I•�0 Z.o 7.4 Z,G 1 1 2 3 4 5 6 7 8 9 10 De th'C�.-) ir. I Z. Z 2 O 3.3 t , Veloci ft/sec) 1 0 1 O. --?- 1 015 1 D 1 D 4 O . -;- w7 Site: - L7 42 o f II k\ i( t,) w i n es Ut Wetted Width (ft): Depth units (circle): Feet OR Inches interval Width (ft): ¢ i o -t ,$ I,2 I•�0 Z.o 7.4 Z,G , 1 2 3 4 5 6 7 8 9 10 Depth 2.2- 3.3 t , Velocity(ft/sec O O _ o" O.G oae O . -;- w7 ,