10-23-2002 Council Agenda - Laserfiche WebLink

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and lake - deposited sands and silts. In post- glacial t.im4s some deposits of peal: and organic soils have formed at the surface. Fill has been placed over the ncrt:ural soils at some time in the past, SOIL CONDITIONS Four basic soil types were encountered in our ±nvest.iaa lion, These are fill; post- glacial anionic soils; silt and silty sands; and Des Moines clayey glacial till, Fill The proposed building area is presently covered by a layer of fill. The thickness of the fill is 13'i to 9 feet at the higher most southerly end of the building. Within the lower northerly one - third of the building area the fill. is 1.2 to 3 feet thick and is underlain by peat and organic soils. The composition of the fill is mainly sandy silt and silty sand, with inclusions of asphalt chunks and traces of root fibers at the south end of the building, and pockets of silty clay in the northern portions. The uppermost few Feet of the fill at the south end of the building is in a medium dense conditior, but it is generally loose elsewhere. Peat and Oraan.ic. Silt Directly below the fill at 4 of our 6 test hole locallors is a deposit of post-glacial organic soils. Organic soils were not encountered below the fill at Test Holes 1 and 2, at the extreme south end of the building. This deposit contains peat and highly organic peaty silt, with random thin lenses of fine sand. SUBTERRANEAN £;NGI NEE RI.NG� INC. M I .C*T.PN F] A [' C;'{_. I S. I im AJ.