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AMERICAN ENGINEERING TESTING, INC. AET Project No. 22-00012 <br /> the horizontal extent of the fill. Based on our observations, it appears that the deeper fill could <br /> be confined to an area within about a 30 feet radius of Test Pit 5. <br /> Below the fill in each test pit, we encountered interbedded strata of fine alluvium consisting of <br /> lean clay, silty clay, clayey silt, and silt to the test pit termination depths. Based on our <br /> observations of the fine alluvium in the test pits,the clay and silt appeared to be of relatively soft <br /> to firm consistency. <br /> 5.3 Groundwater <br /> We encountered groundwater in eight of our 34 borings, at depths of 4.5 feet to 17 feet below <br /> grade,corresponding to elevations ranging from 1008.0 feet to 1020.8 feet NGVD; the remaining <br /> borings were dry when we drilled. We also observed groundwater seeping into the bottom of <br /> Test Pit 5. <br /> The cohesive and semi-cohesive soils on this site are estimated to have relatively low <br /> permeabilities, and an extended period of time, on the order of days or weeks,would be required <br /> for the groundwater to reach equilibrium levels in the borings. Thus, it is possible that <br /> groundwater may be shallower on the site than indicated by the level of free water(or absence of <br /> free water) in the boreholes during the relatively short period of time (approximately 1 hour per <br /> boring) in which we drilled. A discussion of the water level measurement methods is presented <br /> in Appendix A. <br /> Groundwater levels fluctuate seasonally and annually due to varying rainfall and snow melt, as <br /> well as other factors such as infiltration and runoff. Groundwater levels measured during the <br /> winter are usually lower than the groundwater levels in spring and summer. <br /> Page 8 of 28 <br />