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Home My WebLink About20151229 Ver 1_Monitoring Report_20210108ANNUAL STREAM MONITORING REPORT HAECO FACILITY IMPROVEMENTS PROJECT IS-8A LOCATION GREENSBORO, NORTH CAROLINA PREPARED FOR: PIEDMONT TRIAD INTERNATIONAL AIRPORT 1000-A TED JOHNSON PARKWAY GREENSBORO, NORTH CAROLINA 27409 PREPARED BY: PILOT ENVIRONMENTAL, INC. PO BOX 128 KERNERSVILLE, NORTH CAROLINA 27285 JANUARY 5, 2021 PILOT PROJECT 2207.2 PO Box 128, Kernersville, NC 27285 www.pilotenviro.com January 5, 2021 Ms. Kimberly Turney North Carolina Department of Environmental Quality Division of Energy, Mineral and Land Resources —Land Quality Section 450 W. Hanes Mill Road, Suite 200 Winston-Salem, North Carolina 27105 Reference:HAECO Facility Improvements Project 3rd Annual Stream Monitoring Report Piedmont Triad International Airport Greensboro, North Carolina Pilot Project 2207.2 Dear Ms. Turney: Pilot Environmental, Inc. (Pilot), on behalf of Piedmont Triad Airport Authority (PTAA),has completed the post-construction annual stream monitoring report for the unnamed tributary to Horsepen Creek located downstream of the HAECO project.The monitoring was completed in accordance with the Monitoring Plan prepared by WK Dickson dated August 30, 2016 and the Letter of Approval with Modifications,prepared by the North Carolina Division of Energy, Mineral and Land Resources –Land Quality Section,dated August 31, 2016.The findings from the monitoring events are enclosed. If you have questions concerning this report or need additional information, please contact us at (336)310-4527. Sincerely, David S. Brame, PWS B. J. Lineback, CIEC, LEED AP Senior Project Manager Vice President cc:Mr. Chuck Kirchner, NCDEQ-DEMLR Ms. Sue Homewood, NCDEQ-DWR Mr.Alex Rosser, PTAA Mr. Richard Darling, Michael Baker International Annual Stream Monitoring Report Pilot Project 2207.2 January 5, 2021 3 Background In accordance with the 401 Water Quality Certification and the HAECO National Pollutant Discharge Elimination System (NPDES)Construction Stormwater General Permit NCG0100000 for the onsite development of the HAECO Facility Improvements Project, visual and analytical monitoring is required for the unnamed tributary to Horsepen Creek located downstream of the project.The specific requirements as outlined by the 401 Water Quality Certification and the HAECO NPDES Construction Stormwater General Permit NCG0100000 and subsequent Monitoring Plan are summarized below.If monitoring results indicate that the tributary is unstable, then the Piedmont Triad Airport Authority (PTAA)shall conduct an analysis of the cause and propose a resolution to the North Carolina Department of Environmental Quality (NCDEQ) Division. 401 Water Quality Certification Conditions Conditions 5, 6,and 7 of the 401 Water Quality Certification (included below)shall be followed for up to seven years following construction to satisfy monitoring requirements.However, if after three years of monitoring or two documented bankfull events (whichever occurs first)the site demonstrates that there are no significant stream stability concerns, then the monitoring of the site will be terminated. 5. In-stream analytical monitoring shall be performed at stream site ISBA as specified in the most recent version of NCS00050B issued to the PTAA by the Division of Energy, Mineral and Land Resources (DEMLR) and correspondence between the PTAA and DEMLR on March 10, 2016. If monitoring results at ISBA indicate exceedances of Turbidity benchmark values as identified in NCS00050B,the Division WSRO shall be notified in writing. 6. Visual monitoring of the unnamed tributary shall be conducted at location ISBA. Pictures shall be taken of the upstream and downstream bank conditions during each monitoring event. If visual monitoring indicates that banks of the tributary are exhibiting erosion, the Division WSRO shall be notified in writing. 7. If monitoring conducted pursuant to Condition #5 or #6 above indicate that the unnamed tributary is unstable or that the banks of the tributary are unstable, then the Permittee shall conduct a detailed analysis of the cause and propose a resolution to the Division WSRO. Upon approval by the Division WSRO, the Permittee shall implement the resolution accordingly. Annual Stream Monitoring Report Pilot Project 2207.2 January 5, 2021 4 HAECO NPDES Construction Stormwater General Permit NCG0100000 A stream monitoring and maintenance plan is required for the section of stream located below the existing 114” CMP leading to Horsepen Creek.The plan requires all monitoring parameters and frequencies to be followed.Two permanent cross sections have been established and are monitored quarterly.In addition, bank pins have been installed in several locations along the outer bends of meanders.Baseline stream monitoring was conducted prior to diverting water into the new culvert systems, located upstream of Structure #1.In accordance with the permit, a repair/stabilization plan shall be submitted for approval if repairs become necessary to adequately stabilize the stream.Based on the results of the stream monitoring, a repair/stabilization plan has not been submitted and is not proposed at this time. Monitoring Observations Pilot completed the third year of stream monitoring in accordance with the Monitoring Plan prepared by WK Dickson for the unnamed tributary to Horsepen Creek located downstream of the HAECO Facility Improvements Project at the Piedmont Triad International Airport in Greensboro, North Carolina.The approximate location of the stream and monitoring location is depicted on the attached USGS Topographic Map (Drawing 1).During the 2020 monitoring period, Pilot conducted quarterly visual monitoring of the stream,bank pins, and crest gauge and surveyed two fixed cross sections along the stream.The annual results of our findings and supporting data, including monitoring cross section profiles, monitoring observation spreadsheet, and photographs,are attached. Visual Monitoring Visual monitoring of the project channel was conducted quarterly. Visual assessments of stream stability included a complete stream walk and channel inspection. Digital images were taken at fixed representative locations to note any problem areas or areas of concern. Based on the visual monitoring conducted,we did not observe notable channel aggradation and degradation or bank erosion.It should be noted that visual evidence of erosion is apparent along the stream banks. However, similar conditions were evident p rior to completion of the upgradient HAECO project. The erosion does not appear to be exacerbating.Visually turbid conditions were observed during the third quarter monitoring event. Pilot evaluated the adjacent Horsepen Creek and other nearby streams located upgradient of the project drainage area for comparison. These streams were observed to be equally turbid and therefore conditions are likely attr ibutable to heavy rainfall that occurred prior to monitoring.Digital images compiled during the four quarterly monitoring events are included as attachments. Annual Stream Monitoring Report Pilot Project 2207.2 January 5, 2021 5 Cross Sections Two permanent cross sections were installed along the project channel as indicated in the Monitoring Plan. The cross sections are surveyed during the annual monitoring events. Based on the results of the cross section surveys,we did not identify significant changes that could indicate a change in bank stability for Cross Section 1 or Cross Section 2.The results of the annual survey events are depicted on Drawing 2. Bank Pin Arrays Bank pin arrays are used as a supplemental method to monitor erosion on selected meander bends and other locations where there is not a cross section. Bank pin arrays were installed along the outer bends of the meanders. Bank pins were installed just above the water surface and every 1.5 to two feet above the lowest pin. Bank pin exposure was recorded at each monitoring event, and the exposed pins were driven flush with the bank.Based on the quarterly monitoring of the bank pin arrays, significant changes that could indicate a change in bank stability were not identified. The results of the quarterly survey events are included as an attachment. Crest Gauge The crest gauge was checked during each monitoring event. The stage recorded by the crest gauge was measured and logged. If any debris lines or watermarks were observed, photos were taken to document the features. There were no readings recorded by the crest gauge nor watermarks or debris wrack lines observed during the quarterly monitoring events. Annual Stream Monitoring Report Pilot Project 2207.2 January 5, 2021 6 Conclusions and Opinions Based on our findings during the quarterly monitoring events conducted for the unnamed tributary to Horsepen Creek,we did not identify significant changes to the stream as measured by the applicable parameters that could indicate a change in stream stability. It is our opinion that responsive action to changes in bank stability is not warranted at this time .Three years of monitoring have been conducted in accordance with the 401 Water Quality Certification ,the HAECO NPDES Construction Stormwater General Permit NCG0100000 ,and subsequent Monitoring Plan.Considering that three years of monitoring have demonstrated there are no significant stream stability concerns,we recommend the monitoring of the site be terminated .If the NCDEQ deems continuation of the stream monitoring necessary, we request notification from your office prior to the first quarterly monitoring event of the fourth year of stream monitoring. Attachments:Drawing 1 –USGS Topographic Map Drawing 2 –Wetland Map (including Monitoring Cross Section Profiles) Monitoring Observation Spreadsheet Photographs SITE USGS Topographic Map HAECO Facility Improvements Project Post Construction Stream Monitoring Piedmont Triad International Airport Greensboro, Guilford County, NC Pilot Project 2207.2 Drawing 1 USGS Topographic Map Guilford, NC Quadrangle Scale: 1” = 2,000’ LEGEND Site Boundary Wetland Map HAECO Facility Improvements Project Post Construction Stream Monitoring Piedmont Triad International Airport Greensboro, Guilford County, NC Pilot Project 2207.2 Drawing 2 Aerial Imagery from ESRI and Pilot Field Notes Scale: 1” = 50’ Date: 1.4.21 4 5 1 2 3 Legend !>Crest Guage !(Bank_Pins Culvert/Apron Cross Section 1 Cross Section 2 Stream Crest Gauge Bank Pins Culvert/Apron Cross Section 1 Cross Section 2 Stream 815 820 825 0.00 5.00 10.00 15.00 20.00 25.00 30.00Elevation (Ft)Station (Ft) Cross-Section 2 Profile Post Construction Year 1 Post Construction (2018) Year 2 Post Construction (2019) Year 3 Post Construction (2020) 815 820 825 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00Elevation (Ft)Station (Ft) Cross-Section 1 Profile Post Construction Year 1 Post Construction (2018) Year 2 Post Construction (2019) Year 3 Post Construction (2020) HAECO Facility Improvements Project Stream Monitoring Data History - Post Construction See Monitoring Plan 8/31/2016 for monitoring requirements Date Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Q1 1.24.18 0 1 0 0 0 No observed issues No observed issues No reading Q2 4.27.18 0 1.5 1 0 1.5 No observed issues No observed issues No reading Q3 7.12.18 0 1 0 1.5 0 No observed issues No observed issues No reading Q4 11.26.18 0 2 2 2 0 No observed issues No observed issues No reading Q1 2.7.19 0 0 0 0 0 No observed issues No observed issues No reading Q2 4.23.19 0 0.5 0 0 0 No observed issues No observed issues No reading Q3 7.31.19 0 0 1 3 0 No observed issues No observed issues No reading Q4 11.19.19 0 0 0.5 3 0 No observed issues No observed issues No reading Q1 2.14.20 0 0 0 0 0 No observed issues No observed issues No reading Q2 5.1.20 0 0 0 0.25 0 No observed issues No observed issues No reading Q3 7.20.20 0 0 0 0.25 0 No observed issues No observed issues No reading Q4 12.17.20 0.25 0.5 0 2 5 No observed issues No observed issues No reading Bank Pins Array, Observed erosion reported in inches Visual Monitoring Notable observations Cross Sections Notable Observations Crest Gauge Recorded Stage Measurement Photo 1 –Cross section 1, right bank facing left bank Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 2 –Cross section 1, left bank facing right bank Photo 3 –Cross section 1, view facing downstream Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 4 –Cross section 1, view facing upstream Photo 5 –Cross section 2, right bank facing left bank Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 6 –Cross section 2, left bank facing right bank Photo 7 –Cross section 2, view facing downstream Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 8 –Cross section 2, view facing upstream Photo 9 –View facing downstream from culvert apron Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 10 –Bank pin 1 Photo 11 –Bank pin 2 Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 12 –Bank pin 3 Photo 13 –Bank pin 4 Q2 Q2 Q3 Q3 Q4 Q4 Q1 Q1 Photo 14 –Bank pin 5