Agenda - Council - 04/13/2021 - Laserfiche WebLink

Home

Riverstone South EAW January 2021 wetland agencies. The Mississippi River is a MN DNR public watercourse and is located about 666 feet southwest of the project area. Land use within the Mississippi River Corridor Critical Area is discussed under Item 9. Impaired waters listed by the Minnesota Pollution Control Agency (MPCA) and located within 1 mile of the site include the Mississippi River (07010206-805), which is impaired for aquatic consumption (AQC), aquatic life (AQL), and aquatic recreation (AQR) from the Crow River to Upper St. Anthony Falls. Because the Mississippi River is an impaired receiving water within 1 mile of the project, additional BMPs are required for water quality protection, including: 1. complete stabilization of exposed soil within seven calendar days after construction activity in respective parts the project temporarily or permanently ceases; 2. temporary sediment basin(s) for common drainage areas covering five or more acres of area disturbed at one time; and 3. mandatory Stormwater Pollution Prevention Plan (SWPPP) review because the project will disturb more than 50 acres land. The SWPPP must be submitted to the MPCA at least 30 days prior to the construction start date. ii. Groundwater — aquifers, springs, seeps. Include: 1) depth to groundwater; 2) if project is within a MDH wellhead protection area; 3) identification of any onsite and/or nearby wells, including unique numbers and well logs if available. If there are no wells known on site or nearby, explain the methodology used to determine this. Depth to groundwater varies across the project area. Depth to static groundwater levels in 41 groundwater wells located near the project area ranged from 10 to 50 feet (Table 5 and Appendix C). The project area does not fall within a Minnesota Department of Health (MDH) wellhead protection area. The nearest Source Water Protection area is the Ramsey West Drinking Water Supply Management Area, located 0.5 mile east of the project area. Although several groundwater wells are located in the general vicinity of the site, the Minnesota County Well Index does not identify any wells located onsite. One unregistered well was found in the southeastern corner of the site during the land survey for the property. The project proponent is determining whether this well has been abandoned and will ensure it is abandoned in compliance with MDH requirements prior to construction as noted under Item 11.b.iii. The project will be served by the City of Ramsey municipal water supply. The City has eight water supply wells that are all located at least one mile east of the project area. Table 5. Nearby Field Verified Groundwater Wells Well No. Surface Elevation (feet) Depth (feet) Cased Depth (feet) Depth to Location (Direction from Site) Aquifer Static Water Level (feet)(feet) Bedrock 503721 882 221 156 35 118 Northwest St. Lawrence -Tunnel City 430232 883 338 294 30 116 Northeast Wonewoc 511952 860 170 134 28 122 West Tunnel City 486181 858 145 135 13 - West Quat. buried 11