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Home My WebLink About20011551 Ver 5_Monitoring Report_20140307The Catena Group NC DWR, Wetlands Branch 1650 Mail Service Center Raleigh, NC, 27699 -1650 F- CEIVE MAR 0 7 2014 r) \ - Is5( 110 -B Millstone Drive iillsborough, NC 27278 919) 732 -1300 March 5, 2014 Subject: Post Construction Monitoring Report #3, 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 structures installed under the above referenced permit. Please find enclosed the Post Construction Monitoring Report #3 as required in Special Condition E of the 404 permit and wgConditions 3 and 4 of the 401 Permit. Flow in the side channel and structure stability both meet permit requirements. The next monitoring period is scheduled for August of 2014. 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. W6,00- Michael G. Wood, NCLSS President Enclosures: Post Construction Monitoring Report #3 CC: Carlos Goad North Carolina Granite Corporation P.O. Box 151 Mount Airy, NC 27030 Post Construction Monitoring Report #3 North Carolina Granite Corporation Hydrologic Flow and Function of Side Channel Monitoring In- Channel Structure Stability Monitoring Mt. Airy, North Carolina Prepared for: Prepared by: The miirm� Catena Group North Carolina Granite Corporation The Catena Group P.O. Box 151 410B Millstone Drive Mount Airy, NC 27030 Hillsborough, NC 27278 Tel: (336) 786 -5141 Tel: (919) 732 -1300 March 2014 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 NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page i 1.0 INTRODUCTION The North Carolina Granite Corporation (NCGC) received a 404 Permit (SAW -2011- 01765) on September 5, 2012, and a 401 Water Quality 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 Certification 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 Certification requires biannual monitoring of the in- channel structures to insure stability. 2.0 METHODOLOGY On February 25, 2014, Kate Montieth and Nancy Scott of The Catena Group ( Catena) monitored the site by walking the length of the side channel. Photos of the structures were taken at previously established photo stations 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 #3 March 2014 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 bridge over Linville Road (SR 1727). Structures were visually inspected from the bank and photos were taken at four photo points (Appendix A and B). 3.0 RESULTS AND DISCUSSION Flow was measured at the lower and upper cross - sections ( #1 and #2 respectively) of the side channel. Flow at the upper cross - section ( #2) was measured at 88,869 gal /day (Table 1). As occurred during the August 2013 monitoring period, water depths at the lower cross - section ( #1) were below the lower limits of the flow meter, so we were unable to obtain accurate measurements. Therefore, only the flow at the upper cross - section ( #2) is reported here with the assumption that downstream flow would be at a minimum equal to the upstream. Conditions of the permit require measured flow to be a minimum of 26,500 gal /day. Therefore, as of this third monitoring period, Special Conditions E and 3 have both been met and exceeded. Table 1. Flow (gal/day) in side channel to Ararat River Monitoring Period Survey Date Cross- section #1 Cross - section #2 #1 March 28, 2013 71,957 gaUday, 92,423 gal/day #2 August 30, 2013 — 36,804 gaUday #3 February 25, 2014 88,869 gal/day Construction of the in- stream structures was completed on March 15, 2013. Inspection of the structures during this monitoring period did not indicate any instability; therefore Condition 4 of the 401 Certification has been met. NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page 2 Appendix A: Figures NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page 3 The Catena Group North Carolina Granite Corporation Post - Construction Monitoring February 2014 Surry County, North Carolina Date February 2014 Scale 0 40 60 Feet. I i 1 Job No 4 159 Figure Appendix B: Photos NCGC Monitoring Report #3 March 2014 Catena Job# 4159 1 Page 5 Hydrologic Flow and Function of Side Channel Monitoring Photo Station 4: Side Channel enters Ararat at center of photo (yellow arrow) Cross - Section 1 Photo Station 4: Side channel nexus with Ararat River Cross - Section 2 NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page 6 In- Channel Structure Stability Monitoring Photo Station 1: Looking Downstream at structures in Ararat from bridge over Linville Road (SR 1727) Photo Station 2: Single Wing Deflector Photo Station 3: W -weir Photo Station 1: Looking Upstream Ararat from bridge over Linville Road (SR 1727) Photo Station 2: NCGC intake structure with flood gate Photo Station 3: Upstream towards bridge. NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page 7 Double Drop Cross Vane NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page 8 ti Ic �tx 0 lm� LFMI V-, m tu O > 0 C: 0 rl ao Ln c A 9�4 it %A cu (U 0 LL oj c A 9�4 it %A (U (U U- tr 4-j CL Appendix C: Raw Data Sheets NCGC Monitoring Report #3 March 2014 Catena Job# 4159 Page 9