3003 W CASINO RD 1992 SITE DEV 2018-01-01 MF Import

�DRAFT GROUND WATER CONDITIONS We did not observe ground watu seepage tn any of the test pits excavated across the site. Sand pockets encountered in TP-6 wae wet, 6owever, and we observed free water on the surface of gravel clatts wit6in the glacial till in most of the test pits. T1�e only ground water seepage encoontered in any of the borings was at a depth of 32 feet in B-1. We installed a piezometer in this boring to monitor the ground water over time; meazurements taken oo June 3 and 4 indicate a stadc ground water surtace at a depth of 29.7 feet (conesponding to an elevation of 518.3 feei). CONCLUSIONS AND RECOMMENDATIONS GENERAL We wnclude that geotechnical site conditions aze favorable for the proposed North Parl•ing Lot and for the development of future buildings at the site. Based on our site reconnaissance and subsurface ezploratior�s, tt is our opinton that tumre buiid[ngs developed on the aite may be supported on shallow arread footings founded on the native dense glacial till soil. R'e recommend reconditfontag tl�e weathered glacial till soils if foundation elements will be supported in this stratum. The surficial weat�ered portion of the native glacial soiis includes significant organic material which should be stripped and reserved for landscaping areas or removed from t6e site. 7'he lower portion of the weathered mne may be used as structural fill provided the soil is reconditioned and the organic material is screened and removed from the site. Beneath the weathered portion, the native glacial soils will provide an excellent source of savctural fill provided the moisture conteat does not substaatially increase. Glacial till consists of a heterogeaous mixture of gravel, sand, aod silt which frequendy includes cobbles and boulders. Because of the silt content, the soil is moisture-sensitive and can become easily disturbed and virtually impossible to compact when wet. For this reason, we recommend that construccion be completed in the drier summer o- carly fall months. We are presenting detailed recommendations for each geotechnical clement of the proposed development in the following sections. SITE PREPARATION AND EARTHWORK General 'Ibe subsudace soils consist of moisture-sensitive silty sand that can become eaai�y disturbed w6en wet. Uae of these materials ac stnictural fill will not be possible and vafficabiliry will be difficult during wet weather. If wet weather construaion is necessary, all excavated wee loose soils will need to be removed from ihe pavement area and replaced with "select grae�ulu" borrow. If earthwork can be completed during the drier season, the glacial soils are suitable for use as structural fill. Based on the moisturo content of tbe samples obtained, we ezpect that moisture conditioning(aerating)will be necessary for the upper soils in the weathered glacial till. 6 e o E n � I o e e r � 4 FIe No.0120-134R10/062:92