09/29/2021 EB Packet - Laserfiche WebLink

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These borings are used to determine excavation depths for the portions of the site that will have buildings, pavement, or utilities added. The excavations remove vegetation, topsoil, organic soils, soft clays and other unsuitable soils to prepare for soil corrections that will be suitable for construction. All borings encountered primarily clayey sand and sandy lean clay. Groundwater was encountered in three soil borings at depths of 4-7 feet. The soil types on site include: Cathro muck(A/D) in the northwest, which is hydric, and very poorly drained. Hayden fine sandy loam (B) in the north central, non-hydric, and well drained. Webster loam and Dundas loam in the south, hydric, and poorly drained. Stormwater Management A stormwater management plan has been submitted and will receive a full review by the Engineering Department. The following summary review is based upon the same stormwater management plan. Existing Conditions All stormwater on the site drains to a culvert located in the southeast corner of the site or to a wetland in the northwest corner of the site. The wetland in the southwest overflows to the culvert located in the southeast corner. Ultimately, all runoff from the site enters Clearwater Creek, which is an impaired water. Proposed Conditions Lot 1 Total Area: 76,808 sq. ft. Impervious surface area: 45,556 sq. ft. (59%) Lot 2 Total Area: 86,899 sq. ft. Impervious surface area: 44,825 sq. ft. (52%) Outlot A Total Area: 20,223 sq. ft. Outlot B Total Area: 558,948 sq. ft. The plan includes one wet sedimentation basin that will manage the additional stormwater created by the increased impervious surface. This will be a sedimentation pond, as stormwater infiltration was not deemed feasible for this site due to the prevalence of clay soils throughout the site. 3