04/25/96 Agenda & Packet - Laserfiche WebLink

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• AET #95-1343 - Page 4 Water Level Measurements The boreholes were probed for the presence of around water, and water level measurements were taken. The measurements are recorded on the boring logs. A-discussion of the water level measurement methods is presented in the SUBSURFACE EXPLORATION section of this report. Ground water levels were measured within Borings #1-3 at depths ranging from 11/' to 41/' beneath the surface. The shallower water level depths were measured in those borings where time was provided for water level stabilization within the borehole, and may provide a more accurate portrayal of the ground water level depth. This generally corresponds to elevation 98.5' based on the warming house having a finish floor at assumed elevation 100.0'. Ground water levels usually fluctuate. Fluctuations occur due to varying seasonal and yearly rainfall and snow melt, as well as other factors. • GEOTECCAL CONSIDERATIONS Review of Soil Properties Compressibility The swamp deposits are judged to be highly compressible. Peats undergo several phases of consolidation. The primary phase is associated with internal drainage of the material due to imposed loading, and usually represents the largest portion of the overall settlement. Primary settlements in peats typically occur over a period of about 1/2 year to 1 year. Secondary consolidation of the peat continues indefinitely beyond the primary phase. The rate of secondary consolidation decreases with time. Secondary consolidation is attributed to plastic deformation of the particles (which does not happen with mineral soils) and organic decomposition. This type of settlement will continue, even if new load is not applied. Accurate prediction of peat settlement would involve extensive laboratory testing, which is • beyond the scope of this work. However, based on water content test results and experience on