#04 - RFP for Land - Laserfiche WebLink

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Cyphers Logistic Park AUAR 38 March 2022 • Care must be taken to avoid contamination of engineered soils with sediment, in-situ, or topsoil during and after installation. Materials must be segregated. • Installation with dry soil conditions is critical to prevent smearing and compaction. Schedule work for periods of dry weather. • Do not leave infiltration areas and/or perimeter slope exposed overnight. Secure the area from risk of precipitation and damages at the end of every workday. In the event of rain, take action to divert stormwater away from work area and temporarily cover all exposed soils with filter fabric or impermeable sheeting. • In the event that the sediment is introduced into the BMP during or immediately following excavation, remove sediment prior to initiating the next step in the infiltration basin construction process. • Excavate sediment built up during construction after stabilization of upstream areas and before placement of hydraulic soil stabilizer type special. • Stockpiling of materials shall not be allowed in proposed infiltration areas before or after they are constructed. Only specified equipment will be allowed inside of the orange construction fence for the sole purpose of constructing the infiltration basins. • All infiltration basin construction activities shall be completed during dry soil conditions. • All infiltration areas shall be protected during construction operations. In all four development scenarios, roads, parking lots, and stormwater management basins are proposed. To minimize the impact of snow melt on the adjacent natural resources, snow will be stockpiled and managed in proposed landscape and stormwater pre-treatment forebays. In the spring, the proposed infiltration basins will minimize the effect of freezing by providing increased pore space through the native sandy soils and proposed plantings. The basins will also be sized to control the peak runoff rates from the 1-, 10-, and 100-year, 24-hour rainfall events . It is anticipated that approximately 500,000 cubic feet of stormwater volume will need to be retained and infiltrated on-site. Pretreatment of all runoff prior to discharging into the stormwater BMP is encouraged, but not required if the tributary area is less than two acres. The volume provided onsite will provide excess storage to compensate for the runoff volume expected during spring thawing. The pr oposed stormwater management BMPs will be designed to comply with all City of Lake Elmo and VBWD standards and with comply with all maintenance/monitoring requirements of the City and VBWD.