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12-21-2020-WS
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12-21-2020-WS
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12/18/2020 9:57:47 AM
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Old Snelling Avenue Roadway Improvements <br /> Arden Hills, Minnesota <br /> NTI Project No. 19.MSP09107.000 <br /> <br /> <br />GROUNDWATER ISSUES <br />The following presents additional comment and soil specific issues related to measurement of <br />groundwater conditions at your project site. <br />Note that our groundwater measurements, or lack thereof, will vary depending on the time allowed <br />for equilibrium to occur in the borings. Extended observation time was not available during the <br />scope of the field exploration program and, therefore, groundwater measurements as noted on the <br />borings logs may or may not accurately reflect actual conditions at your site. <br />Seasonal and yearly fluctuations of the ground water level, if any, occur. Perched groundwater may <br />be present within sand and silt lenses bedded within cohesive soil formations. Groundwater typically <br />exists at depth within cohesive and cohesionless soils. <br />We anticipate that a system of sump pits and pumps located outside of the foundation areas would <br />be suitable for control if perched groundwater were to be encountered. If excavations are advanced <br />into a static groundwater table within an underlying granular soil layer a well point system would <br />likely be a more suitable method of control. NTI cautions that such seepage may be heavy and will <br />vary based on seasonal and annual precipitation, and ground related impacts in the vicinity of the <br />project.
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