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<br /> <br />Earth Engineering Consultants, Inc. <br />EEC Project No. 1082030 <br />Turnpike Reservoir -Feasibility Study <br />May 5, 2008 <br />Page 4 <br />boring logs included with this report may contain modifications to the field logs based on the <br />results of laboratory testing and evaluation. Based on the results of the field borings and <br />laboratory evaluation, subsurface conditions can be generalized as follows. <br />In summary, the subsurface materials encountered in test borings completed on this site <br />consisted of overburden soils classified as lean clay, sandy lean clay, and clayey sand, which <br />extended to the sand and gravel zone or bedrock formation below. In a few of the boring <br />locations, where previous mining operations had not taken place, native sand and gravel <br />lenses were encountered and extended to the bedrock below. Claystone/siltstone/shale <br />bedrock with intermittent cemented sandstone lenses was encountered in borings B-1 through <br />B-8 at approximate depths of 4 to 18 feet below existing site grades, and extended to the <br />depths explored, approximately 30 to 40 feet below site grade sites. In borings B-9 and B- <br />10, which were drilled within the floor of the "unlined" previously mined "lake," bedrock <br />was encountered at the surface and extended to the depths explored. The bedrock generally <br />classified as lean clay with sand, sandy lean clay and/or clayey sand. Interbedded lenses of <br />very hard to cemented sandstone lenses were encountered at various depths within the <br />bedrock formation. <br />The overburden clay soils were medium stiff to stiff, and generally exhibited low swell <br />potential as measured in laboratory testing at current moisture and density and permeability <br />characteristics conducive for earthen liner material. The underlying siltstone/claystone/shale <br />bedrock encountered in each of the borings was weathered to hard and generally become less <br />weathered with depth. The bedrock formation also exhibited low to moderate swell potential <br />as measured in laboratory testing at current moisture and density and also exhibited <br />permeability characteristics conducive for earthen liner material. <br />The stratification boundaries indicated on the boring logs represent the approximate locations <br />of changes in soil and rock types. In-situ, the transition of materials may be gradual and <br />indistinct.