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Trott Brook Crossing EAW <br />August 2021 <br />Impaired waters (including their DNR Public Water Inventory Number) within one mile of the project are <br />listed below in Table 6. <br />Table 6. Impaired Waters <br />Name <br />DNR ID <br />AVID <br />Reach <br />Impairment <br />Type (s) <br />Approved TMDL(s) <br />Trott <br />Brook <br />M-063-001.5 <br />07010207-680 <br />CD 51 to <br />Rum R <br />AQL (Aquatic <br />Life) <br />TMDL approved for: Dissolved <br />oxygen <br />TMDL not required for: None <br />Additional impairments: <br />FishesBio; InvertBio <br />Impaired waters listed by the Minnesota Pollution Control Agency (MPCA) and located within 1 <br />mile of the site include Trott Brook (AVID 07010207-680), which is impaired for aquatic life <br />(AQL). Because Trott Brook is an impaired receiving water within 1 mile of the project, additional <br />BMPs are required for water quality protection, including: <br />1. complete stabilization of exposed soil within seven calendar days after construction activity <br />in respective parts the project temporarily or permanently ceases; <br />2. temporary sediment basin(s) for common drainage areas covering five or more acres of area <br />disturbed at one time; and <br />3. mandatory Stormwater Pollution Prevention Plan (SWPPP) review because the project will <br />disturb more than 50 acres land. <br />The SWPPP must be submitted to the MPCA at least 30 days prior to the construction start date. <br />The project area does not include any trout streams/lakes, wildlife lakes, migratory waterfowl <br />feeding/resting lake, or outstanding resource value waters. <br />ii. Groundwater — aquifers, springs, seeps. Include: 1) depth to groundwater; 2) ifproject is within <br />a MDH wellhead protection area; 3) identification of any on -site and/or nearby wells, including <br />unique numbers and well logs ifavailable. If there are no wells known on site or nearby, explain <br />the methodology used to determine this. <br />Groundwater discharge was observed at several springs within the northern portion of Wetland 5 <br />(Figure 6). Depth to groundwater varies across upland portion of the project area from 7.5 feet to <br />deeper than 21 feet below the soil surface based upon geotechnical borings and piezometer readings. <br />Haugo GeoTechnical Services (HGTS) performed geotechnical soil borings on the site on July 21, <br />2021. Groundwater elevations observed during geotechnical borings are shown on the following <br />page in Table 7. A field map and boring logs provided by HGTS are included in Appendix C. <br />12 <br />