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� Provioence Family Services Cente� &9��A-�Z�z3-0 <br /> August 25, 1999 Page 6 <br /> , Our on-site explorations revealed somewhat variable near-surface soil conditions but confirtned <br /> the mapped stratigraphy at depth. We encountered dense to very dense, silty, gravelly sands <br /> (glacial tlll)at depths ranging from approximately 2 to 40 Feet beiow existing surface grades. This <br /> subsurface till horizon slopes steeply downward to the northwest and is overtain primarily by loose <br /> to medium-dense sands with varying amounts of fines and gravel (recessionai outwash). Our <br /> explorations also revealed localized depo:,its of loose fill soils and relic topsoil horizons,in addition <br /> to lenses of inedium-dense to dense sands with some silt and gravel(weathered till)overfying the <br /> glacial till. <br /> Boring B-10,which was advanced within the a+urty3,-C of the existing medicai buiiding,encountered <br /> refusal on an unidentified obstruction at a �lepth of 4 feet. Because this area was fortnerly <br /> occupied by a hotel, we infer that the obsrruction couid be rubble associated with the prior <br /> demolition work. After moving to anothPr part of the courtyard, boring B-10 was successfully <br /> advanced. <br /> l The enGosed expioration iogs provide a detailed description of the soil strata encountered in our <br /> subsurfaceexplorations. Table2summarizestheapproximatethicknesses,depths,andeievations <br /> I of selected soil layers. The enGosed Geologic Cross-Sections(Figures 3 through 7)illustrate our <br /> stratigraphic interpretations at selected locations across the project site, and the Subsurface <br /> ( Contour Map (Figure 8) depicts the approximate elevation change over the glacial till horizon. <br /> ( TABLE 2 <br /> APPROXIMATE THICKNESSES, DEPTHS, AND ELEVATIONS OF SOIL LAYERS <br /> ENCOUNTERED IN EXPLORATIONS <br /> � Thickness Thickness of Thickness of Depth of El�vation of <br /> Exploratlon of Fill and Silty, Gravelly Weathered Dense to Very Densa to Very <br /> Topsoil SAND Till Denaa Solis Dense Soils <br /> � (feet) (feet) (feet) (feet) (feet) <br /> B-1 6 14 0 21 186 <br /> ' B-2 0 9Yz 0 10 199 <br /> B-3 0 0 0 6Y� 203Y: <br /> B-4 8 0 3Yz 11'/z 205%z <br /> B-5 2 0 0 2 203 <br /> � 8-6 0 11 0 11 194 <br /> B-7 0 28'/� 3% 32 173 <br /> � B-8 0 27 5%: 40 159 <br /> B-9 SY: 5 0 9Y� 195'/� <br /> B-10 7 9 4 20 186 <br /> ( Elevation datum: Site surve ma <br /> I <br /> � <br /> I 5 �10fiDPROP59Pm�ensSeaine�13000sn21.'7RaC�nsan�NovMenceHosp-RpiwpE <br /> I <br />