07-08-2024 Council Meeting Packet (2)

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Lino Lakes Red Maple Lane November 4, 2023 Project #: 22538.23.MNT Page - 4 ________________________________________________________________________________________________________ M I N N E S O T A IOWA W I S C O N S I N sampler is an indicator of soil characteristics. The results tend to be more meaningful for natural mineral soils than for fill soils. In fill soils, density tests are more meaningful. Penetration resistance values ("N" Value) of 5 to 11 blows per foot (BPF) were recorded in the sands indicating they were very loose to medium dense but mostly loose. The c1ays returned blows of 7 BPF, indicating it was medium. A key to descriptors used to qualify the relative density of soil (such as soft, stiff, loose, and dense) can be found on the Legend to Soil Description in the Appendix. B.3. Groundwater Data During drilling, the drillers may note the presence of moisture on the sampler, in the cuttings, or in the borehole itself. These findings are reported on the Log of Boring sheets. Because water levels vary with weather, time of year, and other factors, the presence or lack of water during exploration is subject to interpretation and is not always conclusive. Water was observed in all boring at depths from 7 to 11 feet below the surface. These depth corresponds to elevations of about 892 to 893 in the borings were three borings which terminated in the clayey soils, but about 877 in the southeast boring which did not encounter the clayey layer. Groundwater levels at the site are expected to fluctuate seasonally similar to levels in the nearby lake, as well as with local weather patterns. C. Project Design Data Each structure has a different loading configuration and intensity, different grades, and different structural and performance tolerances. Therefore, the geotechnical exploration will be construed differently from one structure to another. If the initial structure should change design, we should be engaged to review these conditions with respect to the prevailing soil conditions. Without the opportunity to review any such changes, the recommendations may no longer be valid or appropriate. The project consists of complete reconstruction of pavements and the installation of watermain, storm sewer and sanitary sewer in the subdivision. CVT assumes the pipes will be installed at depths between 5 and 10 feet using open cut excavations or direction drilling. We have assumed final grades will be at or close to the existing grades. The new pavement is expected to consist of asphalt over aggregate base. D.Utility Recommendations D.1. Groundwater/De-watering As mentioned earlier, water was observed in all the boring at a depth of 7 to 11 feet. Due to the high permeability of the dominated sand, well-points or dewatering wells will likely be required for excavations into the water table.