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Ms. Katie Larsen <br />05/07/2025 <br />Page 4 <br />Java Properties - Lino Retail 2.0 Engineering Review <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 /> <br /> <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 /> <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 />8. Both infiltration basins must be able to demonstrate they meet 48-hour drawdown <br />requirements. <br />(DTE 3/11/2025) Outlets have been added to both basins to provide maximum depth <br />below outlet of 1.8’ which correlates to a 48-hour drawdown time <br />(WSB 4/2/2025) Complete <br /> <br />9. The lowest-floor elevation of all buildings must be specified to ensure compliance <br />with infiltration basin freeboard requirements (basin bottom must be at or below <br />lowest-floor elevation). <br />a. This is especially relevant for the potential oil change pit in the Valvoline <br />building. <br />(DTE 3/11/2025) The FFE of each building has been added to the plans. The <br />basement elevation of the Valvoline building has also been added to the <br />plans. <br />(WSB 4/2/2025) Complete <br /> <br />10. Show roof drain routing. Tie into storm sewer at or upstream of a sumped structure to <br />provide pretreatment of roof runoff. <br />(DTE 3/11/2025) The locations of the roof drains will be finalized once tenants have <br />been finalized. <br />(WSB 4/2/2025) Noted, though the locations must still comply with the original <br />comment. <br />Page 253 of 353