01-23-1995 Council Packet - Laserfiche WebLink

Home Browse Search

Glenn Cook September 23, 1994 Page 2 The location of the test boring appears on attached Figure 1, and was located T northeast of the existing street centerline. No t,urlVtce elevation was measured, although it is estimated to be about 931', based on the contour plan provided. We refer you to the standard sheet entitled "Exploration/Classification Methods'* for details on the drilling and sampling methods, the classification methods, and the water level measurement methods. Data sheets concerning the Unified Soil Classification System, the descriptive terminology, and the symbols used on the boring logs are also attached. Laboratory Testing To aid our evaluation of soil conditions, five of the samples were submitted to the laboratory for water content testing. The results of the tests qipear on the boring log, opposite the samples upon which they were performed (in the "WC" column). Soil/Ground Water Conditions We refer you to the boring log for specific details of the conditions encountered. The log contains information concerning soil layering, soil classification, soil description, and moisture. Relative density or consistency is also noted, which is based on the standard penetration resistance (N-value). The boring indicates a profile of 1514' of fill overlying organic swamp deposits, which are about 12' thick. The swamp is then underlain by alluvial silty sands and silts. The fill is mostly sandy in the upper 4' zone, and mostly clayey below this. Ashes were also "'^ted to be present. Tim underlying swamp deposits include both organic clays and fibiic peats, with water contents ranging from 107% to 340% (suggesting a relatively high organic content). The boring log only indicates the subsurface conditions at the sampled location and variations should be expected away ficum the test location. The boreholes were probed for the presence of ground water, and water level measurements were taken (as recorded on the boring log). A discussion of the water level measurement methods is presented within the attached data sheets. A water level was measured as shallow as 3.8' beneath the surface As overlying soils are non-waterbearing granular soils, we judge the watjr level had reasonably stabilized within the borehole, and the measured levels should reasonably represent the ground water table at that time and location. Ground water levels usually fluctuate. Fluctuations occtir due to varying .wasonal and yearly rainfidl and snow melt, as well as other fiactors.