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Ms. Katie Larsen <br />08/06/2025 <br />Page 4 <br />Currently Needed if basins <br />5.00 13.36 29.37 <br />Proposedlandlocked <br /> <br /> <br />Comments: <br />1. An approximate City storm sewer alignment is marked up on the plans showing the <br />pipe intended to provide an outflow for the site rather than emergency overflows. The <br />northern infiltration basin shall outlet into the pipe. <br />(DTE 3/11/2025) The plans have been revised with the updated City storm sewer <br />design <br />(WSB 4/2/2025) Complete <br />2. Remove the City infiltration basin between the roadway and parking lot, the basin <br />west of the driveway access will provide sufficient storage for runoff. <br />(DTE 3/11/2025) This basin has been removed <br />(WSB 4/2/2025) Complete <br />3. Provide an equalization pipe or channel between the existing City stormwater basin <br />and proposed infiltration basin at the 100-yr HWL (906.3). <br />(DTE 3/11/2025) The plans have been revised to eliminate interaction between the <br />City and Development’s stormwater infrastructure. <br />(WSB 4/2/2025) Complete <br /> <br />4. Pipe storage for infiltration is not allowed for water quality volume or rate control. <br />Nonperforated pipes must be used for storm sewer conveyance. <br />(DTE 3/11/2025) The perforated pipes were initially considered to meet the <br />Department of Labor and Industries requirement to not surcharge storm sewer. The <br />storm sewer has been revised to eliminate this conflict and has been revised to be <br />nonperforated. <br />(WSB 4/2/2025) Complete <br />5. An outlet control structure will be needed for the southern infiltration basin based on <br />proposed RCWD rule changes due to go into effect by the end of 2024. <br />a.At the very least, permanent stabilization is needed along the overflow path <br />to reduce the likelihood of large-scale erosion in major storm events. <br />(DTE 3/11/2025) Outlet control structures have been added to both infiltration <br />basins and a storm sewer connection has been added to the south basin <br />(WSB 4/2/2025) Complete <br />6. Soil borings indicate significant amounts of SM soils, meaning design infiltration rates <br />should be 0.45 in/hr consistent with RCWD and MPCA standards. <br />(DTE 3/11/2025) The design infiltration rate has been revised to be 0.45 in/hr. <br />(WSB 4/2/2025) Complete <br /> <br />7. In-situ infiltration rate testing will be needed during or after construction to confirm <br />designed rates are achievable. <br />a. Testing before construction can be used to demonstrate infiltration rates <br />above the 0.45 in/hr standard. <br />(DTE 3/11/2025) The design infiltration rate has been revised to be 0.45 in/hr <br />(WSB 4/2/2025) Complete <br /> <br />Java Properties - Lino Retail 2.0 Engineering Review <br /> <br />