Laserfiche WebLink
Report of Geotechnical Exploration <br />West Armstrong Redevelopment Area, Ramsey, Minnesota <br />March 30, 2022 <br />AET Report No. P-0004952 <br />AM EP I AN <br />ENGINEERING TESTING <br />The moisture content below the upper 3-foot zone shall be from 65% to 115% of the standard <br />optimum water content. <br />7.0 CONSTRUCTION CONSIDERATIONS <br />7.1 Potential Difficulties <br />7.1.1 Runoff Water in Excavation <br />Water can be expected to collect in the excavation bottom during times of inclement weather or <br />snow melt. To allow observation of the excavation bottom, to reduce the potential for soil <br />disturbance, and to facilitate filling operations, we recommend water be removed from within the <br />excavation during construction. Based on the soils encountered, we anticipate the groundwater <br />can be handled with conventional sump pumping. <br />7.1.2 Disturbance of Soils <br />The on -site soils can be disturbed under construction traffic, especially if the soils are wet. If <br />soils become disturbed, they should be subcut to the underlying undisturbed soils. The subcut <br />soils can then be dried and recompacted back into place, or they should be removed and <br />replaced with drier imported fill. <br />7.1.3 Cobbles and Boulders <br />The soils at this site can include cobbles and boulders. This may make excavating procedures <br />somewhat more difficult than normal if they are encountered. <br />7.2 Excavation Backsloping <br />If excavation faces are not retained, the excavations should maintain maximum allowable slopes <br />in accordance with OSHA Regulations (Standards 29 CFR), Part 1926, Subpart P, "Excavations" <br />(can be found on www.osha.ciov). Even with the required OSHA sloping, water seepage or <br />surface runoff can potentially induce sideslope erosion or sloughing which could require slope <br />maintenance. <br />7.3 Observation and Testing <br />The recommendations in this report are based on the subsurface conditions found at our test <br />boring locations. Since the soil conditions can be expected to vary away from the soil boring <br />locations, we recommend on -site observation by a geotechnical engineer/technician during <br />construction to evaluate these potential changes. Soil density testing should also be performed <br />on new fill placed in order to document that project specifications for compaction have been <br />Page 6 of 7 <br />