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HomeMy WebLinkAbout20231361 Ver 1_01 SGWASA PCN_PJD request letter_9_29_2023_20230929 Pre-Construction Notification To: Dicky Harmon U.S. Army Corps of Engineers Raleigh Regulatory Field Office 3331 Heritage Trade Drive, Suite 105 Wake Forest, North Carolina 27587 Sue Homewood NC Division of Water Resources Raleigh Regional Office 3800 Barrett Drive Raleigh, NC 27609 From: Jason Hales – CDM Smith Date: September 29th, 2023 Subject: Pre-Construction Notification and Preliminary Jurisdictional Determination Request South Granville Water and Sewer Authority – Interstate 85 Sanitary Sewer System Improvements Project Granville County, North Carolina To Dicky Harmon, On behalf of the South Granville Water and Sewer Authority (SGWASA), CDM Smith Inc. (CDM Smith) is pleased to submit this pre-construction notification (PCN) and preliminary jurisdictional determination (PJD) request concerning the Interstate 85 (I-85) Sanitary Sewer System Improvements project in Granville County, North Carolina (Figure 1). We are requesting concurrence from the U.S. Army Corps of Engineers (USACE) that the activities proposed below may proceed under a Nationwide Permit and concurrence from the NC Division of Water Resources (NCDWR) that the activities proposed below may proceed under an Individual Water Quality Certification. We are also requesting a riparian buffer authorization in the Neuse River Basin. A pre filing meeting request was submitted on June 15th, 2023 (confirmation e-mail attached). Project Purpose and Need SGWASA serves the southern portions of Granville County, including the municipalities of Creedmoor, Butner, and Stem. Continued growth in the region had presented SGWASA with challenges to upgrade their wastewater system. SGWASA’s wastewater collection system dates from the 1940s and portions of the system are becoming structurally deficient and in need of repairs or upgrades. Currently, portions of the existing wastewater collection system are at maximum capacity to reliably convey flow to the SGWASA Wastewater Treatment Plant (WWTP). The purpose of the project is to improve the infrastructure to manage additional flows and continue to provide safe wastewater treatment for residents in SGWASA’s service area. SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 2 Project Description Figure 1-1 from the Preliminary Engineering Report shows the proposed recommendations to improve the sewer infrastructure. The I-85 Sanitary Sewer System Improvements project includes the following components:  Three new wastewater lift stations (LSs): · New 6.4-million-gallon-per-day (mgd) Joe Peed LS · New 5.2-mgd East Middleton LS · New 1.7-mgd North I-85 LS  Approximately 29,700 feet of new 8-inch to 20-inch diameter force main  Approximately 30,700 feet of new 8-inch to 36-inch diameter gravity sewer  Abandonment of six LSs and abandonment of approximately 42,600 feet of 3-inch to 8-inch diameter force main  Approximately 1,700 feet of new 8-inch water main to serve the three new LSs.  Temporary facilities (including bypass pumping and temporary water) as required to maintain service during construction and connection to the new facilities.  Grading, paving, erosion control, site cleanup, seeding, and testing of all installed sewer infrastructure. There are approximately 50 acres of ground disturbance planned. Construction for the infrastructure improvements will include work along new sewer right-of-way, and existing sewer right-of-way and NCDOT right-of-way. More details regarding the proposed work are shown on the impact plan sheets. The construction period is estimated to be approximately 29 months, with temporary wetland, stream and buffer impacts in place for less than 90 days each. Each individual temporary impact would be limited to a very short time, just enough to install the infrastructure. Standard construction and pipe installation equipment such as cranes, excavators, dump trucks, and similar vehicles would be used for the project. Proper erosion and sedimentation control measures would be employed throughout the project. Jurisdictional Features The Project Study Area (PSA) is approximately 191.5 acres and consists of existing sewer lines and maintained easements, paved roadways, railways, electric utility lines, gas lines, industrial and commercial areas, residences, wooded areas, wetlands, and streams (Figure 2). Figures 3 through 6 show the USGS topographic, USDA Soils survey, NWI wetland, and preliminary wetland boundary mapping for the site. SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 3 Mr. Jason Hales of CDM Smith conducted a wetland delineation within the PSA during September, October, and November, 2022, and January, 2023. Thirty six wetland areas, fourteen perennial streams, and ten intermittent streams were identified during the delineation (Figure 6 through 6p). During the delineation, stream channels and wetland systems within the PSA were delineated and described in the field according to the U.S. Army Corps of Engineers (USACE) 1987 Wetland Delineation Manual and the 2012 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Eastern Mountains and Piedmont Region (Version 2.0). During the delineation, stream and wetland boundaries were marked in the field with numbered plastic surveyor's flagging and recorded with a survey-grade handheld GPS with sub-meter accuracy. Wetland hydrology indicators, hydrophytic vegetation, and hydric soils were observed in the wetland areas. Wetland determination data forms were collected at representative locations (attached). Photos of the soils and vegetation at the data form locations are attached and data form locations are shown on Figure 6. Table 1 provides a summary of the delineated features within the PSA. A buffer determination request for the project area was submitted to NCDWR on September 28th, 2023. Table 1. Summary of potential waters of the United States in the PSA Feature name/number Wetland/Stream Type Latitude Longitude Cowardin class Size of resource in study area (acre) WA Wetland 36.148875 -78.755116 PEM/PFO 0.09 WB Wetland 36.150485 -78.751437 PFO 0.01 WC Wetland 36.150846 -78.749495 PFO 0.04 WD Wetland 36.149688 -78.744796 PFO 0.06 WE Wetland 36.149313 -78.743811 PFO 0.03 WF Wetland 36.149025 -78.742804 PEM 0.01 WG Wetland 36.126015 -78.763433 PFO 0.11 WH Wetland 36.134541 -78.745618 PFO 0.02 WI Wetland 36.133685 -78.746887 PFO 0.15 WJ Wetland 36.132816 -78.746095 PFO 0.33 WK Wetland 36.131559 -78.745063 PFO 0.02 WL Wetland 36.128794 -78.743176 PFO 0.75 WM Wetland 36.127387 -78.742915 PFO 1.67 WN Wetland 36.126397 -78.740053 PFO 0.98 WO Wetland 36.125974 -78.737243 PFO 0.20 WP Wetland 36.125423 -78.744032 PFO 0.42 WQ Wetland 36.124564 -78.743139 PFO 0.16 WR Wetland 36.120175 -78.736832 PFO 0.12 WS Wetland 36.118616 -78.732247 PEM/PFO 0.07 WT Wetland 36.129561 -78.735616 PEM 0.17 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 4 Feature name/number Wetland/Stream Type Latitude Longitude Cowardin class Size of resource in study area (acre) WU Wetland 36.129943 -78.735087 PEM/PFO 0.03 WV Wetland 36.131844 -78.733309 PFO 0.01 WW Wetland 36.131653 -78.733031 PFO 0.06 WX Wetland 36.132373 -78.731151 PEM/PFO 0.06 WY Wetland 36.132154 -78.731166 PEM/PFO 0.01 WZ Wetland 36.143868 -78.726287 PEM/PFO 1.65 WAA Wetland 36.130259 -78.727315 PEM/PFO 0.06 WBB Wetland 36.126313 -78.727432 PEM/PFO 0.62 WCC Wetland 36.122697 -78.727676 PEM/PFO 0.48 WDD Wetland 36.121021 -78.726693 PEM/PFO 1.69 WEE Wetland 36.115317 -78.726023 PEM/PFO 0.23 WFF Wetland 36.122253 -78.717944 PFO 0.003 WGG Wetland 36.117753 -78.709289 PFO 0.06 WHH Wetland 36.117318 -78.706586 PEM/PFO 1.06 WII Wetland 36.117018 -78.705919 PEM/PFO 1.21 WJJ Wetland 36.119638 -78.701777 PFO 1.10 SA Perennial 36.148882 -78.755214 R3UBH 54 LF (0.01 acre) SB Intermittent 36.149854 -78.753269 R4SBC 20 LF (0.001 acre) SC Intermittent 36.150695 -78.749482 R4SBC 277 LF (0.04 acre) SD Perennial 36.148777 -78.747685 R3UBH 20 LF (0.004 acre) SE Perennial 36.149097 -78.744765 R3UBH 83 LF (0.02 acre) SF Perennial 36.148579 -78.741964 R3UBH 14 LF (0.004 acre) SG Perennial 36.146222 -78.732403 R3UBH 221 LF (0.02 acre) SH Intermittent 36.128866 -78.772542 R4SBC 46 LF (0.004 acre) SI Intermittent 36.126785 -78.764721 R4SBC 24 LF (0.002 acre) SJ Perennial 36.128276 -78.758611 R3UBH 135 LF (0.02 acre) SK Intermittent 36.125001 -78.743996 R4SBC 154 LF (0.03 acre) SL Intermittent 36.118241 -78.731641 R4SBC 492 LF (0.05 acre) SM Intermittent 36.130008 -78.735043 R4SBC 38 LF (0.01 acre) SN -Little Ledge Creek Perennial 36.121735 -78.727022 R3UBH 1,315 LF (0.33 acre) SO Perennial 36.132278 -78.731032 R3UBH 39 LF (0.004 acre) SP Intermittent 36.144802 -78.726082 R4SBC 92 LF (0.01 acre) SQ Perennial 36.143709 -78.726338 R3UBH 825 LF (0.07 acre) SR Perennial 36.130037 -78.727479 R3UBH 306 LF (0.003 acre) SS Perennial 36.114953 -78.726259 R3UBH 23 LF (0.04 acre) ST Perennial 36.122267 -78.718402 R3UBH 40 LF (0.002 acre) SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 5 Feature name/number Wetland/Stream Type Latitude Longitude Cowardin class Size of resource in study area (acre) SU Perennial 36.117742 -78.708946 R3UBH 45 LF (0.01 acre) SV – Ledge Creek Perennial 36.117084 -78.706283 R2UBH 128 LF (0.16 acre) SW Intermittent 36.117145 -78.703032 R4SBC 184 LF (0.02 acre) SX Intermittent 36.119082 -78.702103 R4SBC 353 LF (0.02 acre) lf: linear feet Proposed Impacts Permanent and temporary impacts to wetlands, streams and buffers would be necessary to improve the sewer infrastructure serving the sewerage basin's customers. The proposed wetland, stream and buffer impacts are described below, summarized in Tables 2, 3 and 4 below and shown on the attached impacts plan sheets. Wetland Impacts There are 0.242 acres of proposed permanent wetlands impacts for fill associated with the planned replacement of the Middleton LS and construction of the North I-85 LS (Impacts plan sheets C-405 and C-502, Impact numbers W20 and W25). There are 1.797 acres of proposed permanent wetlands impacts for land clearing, conversion and sewer line installation along the sewer alignments (Impacts plan sheets C-212 C-214, C-215, C-216, C-306, C-307, C-308, C-309, C-310, C-311. and C-502; Impact numbers W2, W4, W6, W8, W10, W12, W15, W17, and W24). These areas will be cleared of vegetation, used for the installation of the sewer lines, and maintained for future access. There are a total of 2.039 acres of proposed permanent wetland impacts. There are 2.625 acres of proposed temporary wetlands impacts for construction access, land clearing, and sewer line installation along the sewer alignments (Impacts plan sheets C-101, C-212 C-214, C-215, C-216, C-306, C-307, C-308, C-309, C-310, C-311, C-312, C-321, C-406, C-407, C-408, C-502, C-506, C-507, and C-508; Impact numbers W1, W3, W5, W7, W9, W11, W13, W14, W16, W18, W19, W21, W22, W23, W26, W27 and W28). Portions of these impacts are in currently maintained easements and portions are in forested areas. Currently maintained areas will continue to be maintained for future access and forested areas will be allowed to revegetate with woody species. There are a total of 2.625 acres of proposed temporary wetland impacts. In wetland areas used for the sewer line installation the material from the trench will be used to back fill and will be returned to the trench after the sewer line installation. Temporarily impacted SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 6 wetland areas within the permanent maintenance corridors will be seeded with native wetland herbaceous species and then be maintained as herbaceous wetlands for future access. Temporarily impacted wetland areas outside of the permanent maintenance corridors will be seeded with native wetland seed mix and allowed to revegetate naturally with woody species. There are a total of 4.664 acres of proposed wetland impacts (permanent and temporary). Table 2. Wetland Impacts Summary Impact Number Impact Type Wetland Name Wetland Type Impact Reason Impact Size (acres) W1 Temporary WA Emergent/Forested Construction access, land clearing, gravity sewer installation 0.036 W2 Permanent WI Forested Land clearing, conversion, gravity sewer installation 0.054 W3 Temporary WI Forested Construction access, land clearing 0.009 W4 Permanent WJ Forested Land clearing, conversion, gravity sewer installation 0.136 W5 Temporary WJ Forested Construction access, land clearing 0.061 W6 Permanent WM Forested Land clearing, conversion, gravity sewer installation 0.144 W7 Temporary WM Forested Construction access, land clearing 0.585 W8 Permanent WN Forested Land clearing, conversion, gravity sewer installation 0.140 W9 Temporary WN Forested Construction access, land clearing 0.149 W10 Permanent WO Forested Land clearing, conversion 0.024 W11 Temporary WO Forested Construction access, land clearing 0.019 W12 Permanent WII Emergent/Forested Land clearing, conversion, gravity sewer installation 0.988 W13 Temporary WII Emergent/Forested Construction access, land clearing 0.300 W14 Temporary WHH Emergent/Forested Construction access, land clearing 0.004 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 7 Impact Number Impact Type Wetland Name Wetland Type Impact Reason Impact Size (acres) W15 Permanent WJJ Forested Land clearing, conversion, gravity sewer installation 0.240 W16 Temporary WJJ Forested Construction access, land clearing 0.237 W17 Permanent WR Forested Land clearing, conversion, force main installation 0.023 W18 Temporary WR Forested Construction access, land clearing 0.043 W19 Temporary WS Emergent Construction access 0.015 W20 Permanent WEE Emergent/Forested Fill 0.176 W21 Temporary WDD Emergent/Forested Construction access, land clearing, gravity sewer installation 0.948 W22 Temporary WCC Emergent/Forested Construction access, land clearing, gravity sewer installation 0.137 W23 Temporary WZ Emergent Construction access, force main installation 0.015 W24 Permanent WZ Forested Land clearing, conversion, force main installation 0.048 W25 Permanent WZ Emergent/Forested Fill, access road, culvert 0.066 W26 Temporary WU Emergent Construction access 0.001 W27 Temporary WW Emergent Construction access, force main installation 0.047 W28 Temporary WY Emergent Construction access, force main installation 0.019 Total Permanent Wetland Impacts 2.039 Total Temporary Wetland Impacts 2.625 Total Combined Wetland Impacts 4.664 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 8 Stream Impacts There are 100-linear feet of proposed permanent stream impacts for culvert replacement on 28th Street and culvert installation at the North I-85 LS installation (Impacts plan sheets C-103 and C- 502; Impact numbers S2 and S12). The culvert replacement on 28th Street is to meet grade elevations for the gravity sewer line and the culvert installation at the North I-85 LS installation for site access. There are a total of 100-linear feet of proposed permanent stream impacts. There are 940-linear feet of proposed temporary stream impacts for construction access, dewatering, and sewer line installation along the sewer alignments (Impacts plan sheets C-101, C- 103, C-104, C-201, C-207, C-306, C-307, C-308, C-312, C-314, C-321, C-408, C-502, C-507, and C-508; Impact numbers S1, S3, S4, S5, S6, S7, S8, S9, S10, S11, S13, S14 and S15). There are a total of 940-linear feet of proposed temporary stream impacts. The stream bed in areas of proposed temporary stream impacts will be restored to pre-project elevations and widths using natural stream bed material. Temporarily impacted stream banks in the maintained easements will be restored through regrading, seeding, and woven coir fiber mat and then be maintained for future maintenance access. Temporarily impacted stream banks outside of the maintained easement will be restored through regrading, seeding, woven coir fiber mat, and live staking of deep-rooted native species (typical details shown on sheet CD-10). All work in or adjacent to streams will be conducted so that the flowing stream does not come in contact with the disturbed area (typical detail shown on sheet CD-11). There are a total of 1,040-linear feet of proposed permanent and temporary stream impacts Table 3. Stream Impacts Summary Impact Number Impact Type Stream Name Stream Type Impact Reason Average Stream Width (feet) Impact Length (lf) Impact Size (sqft) Impact Size (acres) S1 Temporary SB Intermittent Construction access, dewatering 2 15 36 0.001 S2 Permanent SD Perennial Rip rap, culvert 5 20 203 0.005 S3 Temporary SE Perennial Construction access, dewatering 5 5 27 0.001 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 9 Impact Number Impact Type Stream Name Stream Type Impact Reason Average Stream Width (feet) Impact Length (lf) Impact Size (sqft) Impact Size (acres) S4 Temporary SH Intermittent Construction access, dewatering 5 23 100 0.002 S5 Temporary SJ Perennial Construction access, dewatering 6 25 128 0.003 S6 Temporary SV Perennial Construction access, dewatering, sewer line installation 55 75 3179 0.073 S7 Temporary SW Intermittent Construction access, dewatering, sewer line installation 4 186 775 0.018 S8 Temporary SX Intermittent Construction access, dewatering, sewer line installation 2 100 187 0.004 S9 Temporary SL Intermittent Construction access, dewatering 3 363 1197 0.027 S10 Temporary SN Perennial Construction access, dewatering, sewer line installation 9 35 453 0.010 S11 Temporary SU Perennial Construction access, dewatering 7 9 61 0.001 S12 Permanent SQ Perennial Culvert 4 80 268 0.006 S13 Temporary SQ Perennial Construction access, dewatering, sewer line installation 4 55 162 0.004 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 10 Impact Number Impact Type Stream Name Stream Type Impact Reason Average Stream Width (feet) Impact Length (lf) Impact Size (sqft) Impact Size (acres) S14 Temporary SN Perennial Construction access, dewatering, sewer line installation 5 27 198 0.005 S15 Temporary SO Perennial Construction access, dewatering, sewer line installation 4 22 177 0.004 Total Permanent Stream Impacts 100 471 0.011 Total Temporary Stream Impacts 940 6,680 0.153 Total Combined Stream Impacts 1,040 7,151 0.164 lf: linear feet; sgft: square feet Buffer Impacts There are 131-square feet of the proposed permanent buffer impacts to Zone 1 for rip rap culvert protection for culvert replacement at 28th Street (Impact plan sheet C-103, Impact number B5). There are 638-square feet of proposed permanent buffer impacts to Zone 1 and 3,111-square feet of proposed permanent buffer impacts to Zone 2 for installation of the Middleton LS (Impact plan sheet C-401, Impact numbers B24, B25, B42, and B43). There are 912-square feet of proposed permanent buffer impacts to Zone 1 and 1,281-square feet of proposed permanent buffer impacts to Zone 2 for access roadway installation at the North I-85 LS (Impact plan sheet C-502, Impact numbers B32 and B33). There are 18,810-square feet of proposed permanent buffer impacts to Zone 1 and 13,176-square feet of proposed permanent buffer impacts to Zone 2 for land clearing, conversion, and sewer line installation within future maintenance corridors along the sewer alignments and at the lift stations (Impacts plan sheets C-306, C-307, C-308, C-321, and C-502, Impact numbers B10, B11, B14, B15, B18, B19, B29, B34, and B35). Following installation of the sewer lines and lift stations permanently impacted buffer areas for conversion will be regraded, seeded, and maintained as herbaceous ground cover for future access. There are a total of 6,073-square feet of proposed permanent buffer loss impacts. There are a total of 31,986-square feet of proposed permanent buffer conversion impacts. SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 11 There are a total of 38,059-square feet of proposed permanent buffer impacts. There are 55,153-square feet of proposed temporary buffer impacts to Zone 1 and 53,667-square feet of proposed temporary buffer impacts to Zone 2 for construction access, land clearing, and sewer line installation along the sewer alignments (Impacts plan sheets C-101, C-103, C-104, C-306, C-307, C-308, C-312, C-314, C-317, C-321, C-401, C-405, C-502, C-507, and C-508, Impact numbers B1, B2, B3, B4, B6, B7, B8, B9, B12, B13, B16, B17, B20, B21, B22, B23, B26, B27, B28, B30, B31, B36, B37, B38, B39, B40, and B41). Following installation of the sewer lines temporarily impacted buffer areas outside of maintained easements will be regraded, seeded, and allowed to revegetate naturally with woody species. There are a total of 108,820-square feet of proposed temporary buffer impacts. There are a total of 146,879-square feet of proposed permanent and temporary permanent impacts. Table 4. Buffer Impacts Summary Impact Number Impact Type Stream Name Stream Type Impact Reason Zone 1 Impact (sqft) Zone 2 Impact (sqft) B1 Temporary SA Perennial Construction access, land clearing, sewer line installation 686 B2 Temporary SA Perennial Construction access, land clearing 900 B3 Temporary SD Perennial Construction access 1073 B4 Temporary SD Perennial Construction access 566 B5 Permanent SD Perennial Rip rap, culvert 131 B6 Temporary SE Perennial Construction access 1422 B7 Temporary SE Perennial Construction access 855 B8 Temporary SV Perennial Construction access 1089 B9 Temporary SV Perennial Construction access 707 B10 Permanent SV Perennial Land clearing, conversion, sewer line installation 2094 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 12 Impact Number Impact Type Stream Name Stream Type Impact Reason Zone 1 Impact (sqft) Zone 2 Impact (sqft) B11 Permanent SV Perennial Land clearing, conversion, sewer line installation 1429 B12 Temporary SW Intermittent Construction access 4589 B13 Temporary SW Intermittent Construction access 1299 B14 Permanent SW Intermittent Land clearing, conversion, sewer line installation 6824 B15 Permanent SW Intermittent Land clearing, conversion, sewer line installation 1881 B16 Temporary SX Intermittent Construction access, land clearing 3014 B17 Temporary SX Intermittent Construction access, land clearing 840 B18 Permanent SX Intermittent Land clearing, conversion, sewer line installation 3492 B19 Permanent SX Intermittent Land clearing, conversion, sewer line installation 4592 B20 Temporary SL Intermittent Construction access, land clearing 6927 B21 Temporary SL Intermittent Construction access, land clearing 4998 B22 Temporary SN Perennial Construction access, land clearing, sewer line installation 26945 B23 Temporary SN Perennial Construction access, land clearing, sewer line installation 35552 B24 Permanent SN Perennial Middleton LS installation 400 B25 Permanent SN Perennial Middleton LS installation 2543 B26 Temporary ST Perennial Construction access, sewer line installation 405 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 13 Impact Number Impact Type Stream Name Stream Type Impact Reason Zone 1 Impact (sqft) Zone 2 Impact (sqft) B27 Temporary SU Perennial Construction access, sewer line installation 1957 B28 Temporary SU Perennial Construction access, sewer line installation 1196 B29 Permanent SU Perennial Land clearing, conversion, Joe Peed LS 540 B30 Temporary SQ Perennial Construction access, sewer line installation 814 B31 Temporary SQ Perennial Construction access, sewer line installation 1560 B32 Permanent SQ Perennial Access road I-85 LS 912 B33 Permanent SQ Perennial Access road I-85 LS 1281 B34 Permanent SQ Perennial Land clearing, conversion, access road, sewer line installation 6400 B35 Permanent SQ Perennial Land clearing, conversion, access road, sewer line installation 4734 B36 Temporary SM Intermittent Construction access, sewer line installation 1858 B37 Temporary SM Intermittent Construction access, sewer line installation 1569 B38 Temporary SN Perennial Construction access, sewer line installation 2430 B39 Temporary SN Perennial Construction access, sewer line installation 1569 B40 Temporary SO Perennial Construction access, sewer line installation 2349 B41 Temporary SO Perennial Construction access, sewer line installation 1651 B42 Permanent SS Perennial Middleton LS installation 238 B43 Permanent SS Perennial Middleton LS installation 568 Zone 1 Zone 2 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 14 Impact Number Impact Type Stream Name Stream Type Impact Reason Zone 1 Impact (sqft) Zone 2 Impact (sqft) Total Permanent Buffer Impacts – Loss 1,681 4,392 Total Permanent Buffer Impacts - Conversion 18,810 13,176 Zone 1 Zone 2 Total Permanent Buffer Impacts 20,491 17,568 Total Temporary Buffer Impacts 55,153 53,667 Total Combined Buffer Impacts 75,644 71,235 sqft: square feet Avoidance and Minimization The proposed wetland, stream and buffer impacts have been kept to the minimum possible to allow the sewer infrastructure installation. The planned limits of disturbance for construction were reduced following the wetland delineation to reduce potential impacts. The planned permanent maintenance corridors were reduced following the wetland delineation and kept to a maximum of 30 feet wide with areas 20 feet wide across the features. The proposed impact amounts would be a maximum of potential impacts to the features. The actual construction efforts to replace and install the infrastructure will likely require less than the proposed totals. Actual land clearing will be the minimum necessary to install the infrastructure. In wetlands, across stream channels and in riparian buffers, stumps will be grubbed only as needed to install the infrastructure, and remaining stumps will be cut off at grade level. The general stripping of topsoil within wetlands along the construction corridor will be avoided. Heavy equipment working in wetlands will be placed on mats to minimize soil disturbance and compaction. Work in wetlands will be limited to only what is necessary to install the infrastructure. Temporarily wetland areas within the permanent maintenance corridors will be seeded with native wetland herbaceous species and then be maintained as herbaceous wetlands for future access. Temporarily wetland areas outside of the planned permanent maintenance corridors will be seeded with native wetland seed mix and allowed to revegetate naturally with woody species. All work in or adjacent to streams will be conducted so that the flowing stream does not come in contact with the disturbed area. The stream bed in areas of proposed temporary stream impacts will be restored to pre-project elevations and widths using natural stream bed material. Temporarily impacted stream areas within the permanent maintenance corridors will have the banks restored through regrading, seeding, and woven coir fiber mat and then be maintained for future maintenance access. Temporarily impacted stream banks outside of the permanent maintenance corridors will be restored through regrading, seeding, woven coir fiber mat, and live staking of deep-rooted native species. Temporarily impacted riparian buffer areas outside of the permanent maintenance corridors will be allowed to revegetate naturally with woody species. SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 15 There will be no change in pre-construction contours of waters of the United States in temporarily impacted areas. Erosion control matting that incorporates plastic mesh and/or plastic twine will not be used along streambanks or within wetlands. All mechanized equipment operated near surface waters shall be inspected and maintained regularly to prevent contamination of surface waters from fuels, lubricants, hydraulic fluids, or other toxic materials. Construction shall be staged in order to minimize the exposure of equipment to surface waters to the maximum extent practicable. Mitigation Mitigation of 0.484 wetland credits is proposed for 0.242 acres of wetland fill associated with the planned replacement of the Middleton LS and construction of the North I-85 LS. Mitigation of 1.797 wetland credits is proposed for 1.797 acres of wetland conversion associated with the planned sewer line installation and future maintenance easements. A total of 2.281 wetland mitigation credits would be purchased from a private bank in the Upper Neuse 03020201 River Basin or from the North Carolina Division of Mitigation Services (NCDMS). Statements of availability (SOA) for 1.01 wetland credits from Wildlands Holding and for 0.14 wetland credits from Resource Environmental Solutions are attached. The remainder of the credits or potentially all of the credits would be purchased from NCDMS. Mitigation of 6,073 riparian buffer credits is proposed for 6,073-square feet of buffer loss associated with the planned replacement of the Middleton LS and construction of the North I-85 LS. A SOA for 6,000 riparian buffer credits from ECO TERRA is attached. Threatened and Endangered Species A biological assessment for potential effects to endangered or threatened species was submitted to the US Fish and Wildlife Service (USFWS) Raleigh office for review on January 18th, 2023. The biological assessment included a field survey for potential threatened and endangered species and habitats conducted in the project area September 1st through 3rd, September 26th through 29th, and October 11th through 14th, 2022. A response from USFWS was received on August 11th, 2023 (attached), concurring with the species determinations except for tricolored bat, for which USFWS recommended a determination of "not likely to jeopardize the existing of the species" with specific recommendations to minimize impacts (prohibit tree cutting and humane exclusion during pup season May 15-July 31; and cold winter months Dec. 1 - Mar. 31). These restrictions have been added to the project design plans. SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 16 Historical and Cultural Resources The NC State Historic Preservation Office (NCSHPO) HPOWEB 2.0 mapper http://gis.ncdcr.gov/hpoweb/ was to identify known areas of archaeological or historical value that are within the project area (Figure 7). One surveyed site – the Camp Butner Buildings (GV0534dup), is located in the project area near East A Street and Central Avenue. There are two surveyed sites within 0.5 mile of the East Middleton LS site – the Hester-Green House (GV0489) and New Hope Methodist Church (GV0488). A review request for the project was submitted to NCSHPO on February 6th, 2023. NCSHPO staff provided a response on March 7th, 2023 (attached), noting they are aware of no historic resources that would be affected by the project. We look forward to working with you on the project. Please contact us with questions or if additional information is required. Sincerely, Jason Hales Wetland Scientist CDM Smith 910-520-1832 halesjc@cdmsmith.com Attachments: Photographs Figure 1 – Site Location Map Figure 1-1 Proposed Improvements Map Figure 2 –Project Study Area Map Figure 3 – USGS Topographic Map Figure 4 – USDA NRCS Soil Survey Map Figure 5 – USFWS NWI Map Figure 6 – Preliminary Wetland Boundary Map Figure 7 - NCSHPO GIS Data August 1st, 2022 Map Proposed Impacts Plan Sheets NCDWR Pre-filing Meeting Request received email dated June 15th, 2023 USFWS response e-mail August 11th, 2023 NCSHPO response e-mail March 7th, 2023 Wetland Determination Forms Jurisdictional Determination Request Form Preliminary Jurisdictional Determination Request Form Agent Authorization Form Wetland and Buffer Mitigation SOAs Design Plans September 2023 SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 17 Photographs Photo 1: View of soils at wetland data point DP-01-Wet (Wetland WA). Photo 2: View of vegetation at wetland data point DP-01-Wet (Wetland WA). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 18 Photo 3: View of soils at upland data point DP-02-Up (near Wetland WA). Photo 4: View of vegetation at upland data point DP-02-Up (near Wetland WA). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 19 Photo 5: View of soils at wetland data point DP-03-Wet (Wetland WH). Photo 6: View of vegetation at wetland data point DP-03-Wet (Wetland WH). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 20 Photo 7: View of soils at upland data point DP-04-Up (near Wetland WH). Photo 8: View of vegetation at upland data point DP-04-Up (near Wetland WH). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 21 Photo 9: View of soils at wetland data point DP-05-Wet (Wetland WR). Photo 10: View of vegetation at wetland data point DP-05-Wet (Wetland WR). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 22 Photo 11: View of soils at upland data point DP-06-Up (near Wetland WR). Photo 12: View of vegetation at upland data point DP-06-Up (near Wetland WR). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 23 Photo 13: View of soils at wetland data point DP-07-Wet (Wetland WX). Photo 14: View of vegetation at wetland data point DP-07-Wet (Wetland WX). SGWASA – I-85 Sanitary Sewer System Improvements Pre-Construction Notification and Preliminary Jurisdictional Determination Request September 29th, 2023 Page 24 Photo 15: View of soils at upland data point DP-08-Up (near Wetland WX). Photo 16: View of vegetation at upland data point DP-08-Up (near Wetland WX).