04-22-1981 Council Agenda - Laserfiche WebLink

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UNITED STATES DEPARTMENT OF AGRICULTURE SOIL CONSERVATION SERVICE 1827 North St. Paul Road, Maplewood, MN 55109 April 1, 1981 TO: Supervisors of the Pamsey Soil & Water Conservation District SUBJECT: Review of Lot 9, Block 2 of Gervais Shores, 1st Addition on request of Little Canada. The purpose of this report is to review the building site potential of lot 9, Block 2 of Gervais Shores. See attached map for location. Below is a list of the present characteristics of the lot: 1. The soils of the area are Hayden fine sandy loam. The soils are composed of loam surface layers with clay loam subsoils and loam under- lying material. This soil is generally well suited to building site development. Steep slopes become a severe limitation as slopes exceed 18 percent. Potential fLost heave is moderate, and moderate changes in volume may occur with changes in soil moisture in the upper 2 to 3 feet of this soil. Paved surfaces need special design to prevent breakup. Soil strength for supporting structures is low. Sidehill seepage is a hazard due to lateral downslope movement of water within the soil above the clay loam portion of the soil profile. 2. The lot is centrally occupied by a drainageway. Fill material has been placed in the right half (when facing downhill) of the drainageway. Slopes on the site, as they existed prior to placement of the fill, were, measured on the attached map. The center of the drainageway (labeled B on map) measured 15 percent. This was prior to construction of the road. The side slopes of this drainageway are in the 30% - 407, range. The fill material may be 26 feet or nore in depth at its deepest point. It appears to be composed of soils from the immediate area. The compaction of this material is unknown; vegetation in the area does not appear to have been removed prior to placement of the fill. The lakeside face of the fill slope is in the 65 - 70% slope range. The base of the fill slope is within 100 feet of the Lakeshore. The slope funu the fill base to the lakeshore is about 207,; ground vegetation in this area is sparse. 3. A watershed boundary is delineated on the attached map. This indicates the area that contributed runoff water to the drainageway prior to develop- ment. Presently, the road conducts this runoff past the drainageway to a storm sewer. The road conducts runoff from the vicinity of Block 1, lot 4 (see map). The road curve at Block 2, lot 9 does not have a prominent curb and over- topping may occur. 23