Laserfiche WebLink
-f <br />e <br />EEC Project No. 1082030 <br />Turnpike Reservoir -Feasibility Study <br />May 5, 2008 <br />Page 2 <br />Earth Engineering Consultants, Inc. <br />construction of the water storage reservoir. Water rights and other related issues are <br />beyond the scope of this report. <br />The results of our engineering study, including the boring location diagram, laboratory <br />testing results, the test boring records from our supplemental 10 borings, and the <br />geotechnical engineering analyses needed to aid in the design and construction of the <br />proposed 800 to 1,000 acre-foot reservoir and other earth connected aspects of this <br />project are included herein. <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, <br />which extended to the sand and gravel zone or bedrock formation below. In a few of the <br />boring locations, where previous mining operations had not taken place, native sand and <br />gravel lenses were encountered and extended to the bedrock below. <br />Claystone/siltstone/shale bedrock with intermittent cemented sandstone lenses was <br />encountered in borings B-1 through B-8 at approximate depths of 4 to 18 feet below <br />existing site grades, and extended to the depths explored, approximately 30 to 40 feet <br />below site grade sites. For borings B-9 and B-10, which were drilled within the floor of <br />the "unlined" previously mined "lake," bedrock was encountered at the surface and <br />extended to the depths explored. The bedrock generally classified as lean clay with sand, <br />sandy lean clay and/or clayey sand. Interbedded lenses of very hard to cemented <br />sandstone lenses, (ranging from several inches to possibly 1-foot or greater in thickness), <br />were encountered at various depths within the bedrock formation. Groundwater was <br />encountered during drilling operations in a majority of the test borings at depths of <br />approximately 8 to 22 feet below site grades. <br />We anticipate excavation of the reservoir within the upper subsoils and underlying <br />bedrock could be accomplished by conventional-type excavation equipment. However, <br />excavation within the zones of interbedded cemented to well-cemented sandstone lenses <br />at increased depths may require the use of specialized equipment to achieve the desired <br />depths.