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~ as breaks or steep side slopes adfacent to the channels of present or <br />former streams. They also occur as the steep Paces of terraces that <br />border bottom lands and flood plains. This land type consists of allu- <br />vium of variable materials and is very shallow over gravel and sand. <br />These materials have a loamy sand or sandy loam surface layer. In many <br />areas this layer is 5 to 20 percent gravel. The surface layer varies <br />in reaction from place to place and in places is calcareous. Much of <br />this land type is rapidly being mined for sand and gravel". <br />DRILLING INVESTIGATION <br />• <br />~ The drilling program consisted of five test holes (see test hole <br />(_ <br />location map, Figure 3). Test hole 1 was drilled using an 8 inch hol- <br />low stem auger and test holes 2 through 5 were drilled using a continu- <br />• ' <br />ous flight solid auger. Test holes varied in depth from 44 to 60 feet. <br />Logs of the test holes are shown on Figure 4. Bag samples were col- <br />lected from test holes 2 through 5 at depths varying from 6 to 25 feet. <br />Overburden, consisting of topsoil and clay, varies from 1 foot in test <br />hole 2 to 6 feet in test hole 5, for an average of 2.9 Peet across the <br />site. The thickness oP the sand and gravel deposit varies Prom 33 Peet <br />• <br />in Test hole 5 to 50 Peet in test hole 2, with an overall average from <br />the flue test holes oP 41.5 feet. Cross sections across the site are <br />shown on Figures 5, 6, 7, and 8. A bedrock contour map !s shown in <br />• <br />Figure 9. Water was encountered in all five test holes at depths <br />varying from 17 to 24 feet. This water might be a problem if excava- <br />tlon takes place below 25 feet. Pit stability problems, which might <br />result from pit dewatering were not addressed in this report. <br />-3- <br />• <br /> <br /> <br />• <br /> <br />• <br />