W Ater R Esources 4-34 Figure 4.3.1-1 Bedrock Aquifers
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Water Resources Water Figure 4.3.1-1 Bedrock Aquifers 4 - 34 TABLE 4.3.1-1 Wellhead Protection Areas Crossed by the NGT Project Mainline State/County From MP To MP Crossing Length (feet) Water Supply Type Name Summit, OH 37.2 37.4 1,076 Community Country View South Apartments Summit, OH 37.4 37.6 1,435 Community Greentree Place 4900 PWS a Wayne, OH 57.4 57.7 1,297 Community Rittman City PWS a Wayne, OH 57.6 57.7 606 Community Rittman City PWS a Medina, OH 57.7 59.1 7,337 Community Rittman City PWS a Medina, OH 57.7 59.1 7,381 Community Rittman City PWS a Medina, OH 68.7 69.2 2,922 Community Medina Co/Southern Water District PWS a Medina, OH 68.9 69.2 1,799 Community Medina Co/Southern Water District PWS a Erie, OH 116.7 117.3 2,972 Community Riverview Manor Apartments Erie, OH 125.5 131.5 31,831 Community Bloomville Village PWS a Erie, OH 125.5 131.5 31,831 Community Flat Rock Care Center Erie, OH 125.5 131.5 31,831 Community Republic Village Erie, OH 125.5 131.5 31,831 Noncommunity Ebenezer United Methodist Church Erie, OH 125.5 131.5 31,831 Noncommunity Melmore United Methodist Church Sandusky, OH 131.5 133.4 10,072 Community Bloomville Village PWS a Sandusky, OH 131.5 133.4 10,072 Community Flat Rock Care Center Sandusky, OH 131.5 133.4 10,072 Community Republic Village 4 Sandusky, OH 131.5 133.4 10,072 Noncommunity Ebenezer United Methodist Church - 35 Sandusky, OH 131.5 133.4 10,072 Noncommunity Melmore United Methodist Church Sandusky, OH 153.4 155.2 9,649 Community Lindsey Village Water Sandusky, OH 154.6 160.2 29,568 Community Gibsonburg Village PWS a Sandusky, OH 160.2 163.5 17,161 Community Woodville Village Wood, OH 164.8 164.9 538 Noncommunity Sycamore Grove Bar Wood, OH 173.0 173.5 2,596 Noncommunity Tanglewood Golf Club Monroe and Washtenaw, MI 236.3 238.8 12,830 Unknown Milan __________________________________ a Public Water System Sources: OEPA (2016); USGS and MDEQ (2002). Water Resources Water Water Supply Wells and Springs GIS data from the OEPA (2016), ODNR (2016c), MDEQ (2016), and Michigan Department of Technology, Management, & Budget (2016), as well as preliminary field survey results from NEXUS and Texas Eastern, were used to identify public and private water supply wells and springs within 150 feet of construction workspaces (see appendix H-1). NEXUS and Texas Eastern would continue to identify nearby water supply sources through ongoing surveys and landowner communications. NGT Project As indicated in appendix H-1, 156 wells and 3 springs have been identified to date within 150 feet of the NGT Project mainline construction workspace in Ohio. The three springs are likely used for agricultural purposes. There are 43 wells within 150 feet of access roads and another 18 wells are within 150 feet of aboveground facilities, staging areas, or pipe/contractor yards. In Michigan, 21 wells have been identified to date within 150 feet of the NGT Project mainline construction workspace. Additionally, as indicated in appendix H-1, one well is within 150 feet of the Willow Run M&R Station, three wells are within 150 feet of Ware Yard 4-1, and two wells are in the vicinity of access roads. No springs or seeps used for drinking water or agricultural purposes were identified near the NGT Project in Michigan. TEAL Project One private well and three springs have been identified within 150 feet of the TEAL Project construction workspace to date. The springs are likely being used by cattle. Contaminated Groundwater We accessed federal, state, and local government databases to identify facilities with potential and/ or actual existing sources of contamination that may affect groundwater quality near the NGT and TEAL Projects. As discussed in section 4.9.6, numerous sites with known or suspected soil and groundwater contamination were identified within 0.25 mile of the NGT Project. Based on distance, regulatory status, and other information, the majority of these sites are unlikely to impact groundwater quality beneath the NGT Project. In section 4.9.6, we recommend that NEXUS further assess the potential for 11 of the sites to impact groundwater quality beneath the NGT Project and to provide site-specific contamination management plans for those sites determined to pose a risk to groundwater quality beneath the Project. One of these sites recommended for further review is a crude oil spill approximately 50 feet from the NGT Project at MP 37.4., which is in proximity to the WHPA for the Greentree Place 4900 Public Water System (MP 37.4 to 37.6). No known, contaminated sites with the potential to impact groundwater quality were identified within 0.25 mile of the TEAL Project. Groundwater Use Construction of the NGT and TEAL Projects would require approximately 70.1 million gallons of water for hydrostatic testing, HDD installations, and construction of aboveground facilities (see table 4.3.2- 5). As discussed in section 4.3.2.1, approximately 67.0 million gallons (96 percent) of construction-related water would be obtained from surface water sources. The sources of the remaining 3.1 million gallons (4 percent) necessary for construction have not been identified to date, but could include groundwater resources. Operational groundwater requirements at existing or modified aboveground facilities would be minimal as none of the facility operations would require significant water use. Water Resources 4-36 4.3.1.2 Impacts and Mitigation Construction of the NGT and TEAL Projects would occur mostly above the water table; however, where the water table is within trench or grading depth, the elevation and flow characteristics of shallow groundwater resources could be affected by dewatering. Excavation could also increase turbidity within the resource. These impacts would be temporary, minor, and localized to the area near to construction, and would be further reduced by restoring surface contours to pre-construction conditions and implementing the applicants’ E&SCPs, which include measures to avoid or minimize soil erosion in the trench and on the right-of-way, control the discharge of water in nearby uplands, and encourage revegetation after construction. After construction activities are complete, the applicants would restore the ground surface as closely as practicable to original contours and revegetate any previously vegetated, exposed soils to restore pre-construction overland flow patterns as well as groundwater recharge. Therefore, groundwater recharge is not expected to be impacted. Additionally, any impacts to groundwater flow resulting from the trench intersecting the water table would be minor and localized, and would not be expected to discernably impact the groundwater flow regime, or the quantity or quality of groundwater that is used for residential potable water supply. Since residential wells are screened at depths greater than the bottom of the pipeline trench, impacts to well yields are not anticipated even if the trench penetrates below the water table. In areas where backfill materials are more permeable than the substrate, trench breakers would be installed to eliminate preferential flow paths for shallow groundwater within the pipeline trench. As indicated in section 4.3.1.1, a crude oil release near a WHPA at MP 37.4 may have potential for contaminating groundwater near the NGT Project. Although not anticipated, if contaminated soil or groundwater is encountered during construction, the applicable agencies and FERC will be notified, and NEXUS would implement its SPCC Plan to manage and minimize the potential effects on groundwater from any existing contaminated sites and potential spills during construction. Additionally, if contaminated groundwater would occur within the backfilled trench, the trench breakers would mitigate its spread to uncontaminated portions of the surficial aquifer. Construction of the NGT and TEAL Projects could increase turbidity and reduce capacity in nearby water supply wells. The applicants have identified wells within 150 feet of the construction workspaces and would verify well locations through final civil surveys and landowner communication. Blasting would be conducted in accordance with the Projects’ Blasting Plans (see appendices E-1 and E-2) and specific plans designed to avoid damage to nearby structures including wells. The applicants would offer to conduct pre- and post-construction testing of water quality and yield in all wells within 150 feet of the construction workspace, and would repair or replace any wells that are damaged, or otherwise compensate the well owner. The applicants would file a report with the Secretary within 30 days of placing the facilities in service, discussing whether any complaints were received concerning well yield or water quality and how each was resolved. Fueling would be prohibited within 200 feet of a private well and within 400 feet of a public well. We anticipate that any increased turbidity or capacity reduction in wells would be minor and temporary, and conclude that the applicants’ well identification, testing, and mitigation procedures would avoid or adequately address any impacts on wells. An inadvertent release of fuel, lubricants, and other substances could impact groundwater quality. The degree of impact would depend on the type, amount, and duration of material released; the type of soil or geologic material at the land surface; the depth to groundwater; and the characteristics of the underlying aquifer. The potential for a release to impact groundwater is greater in areas of shallow groundwater, such as where the NGT Project would cross the Oak Openings area of western Ohio. To minimize and mitigate impacts, the applicants provided Project-specific SPCC Plans that specify contractor training, the use of environmental inspectors, procedures for the safe storage and use of hazardous materials, and remedial actions that would be taken to address a spill.