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Earth Engineering Conuiltants.LLC <br /> EEC Project No. 1122096 <br /> Signal Resen•oir Improvements <br /> August 5.2015 <br /> Page-4 <br /> report may contain modifications to the field logs based on the results of laboratory testing and <br /> evaluation. Based on the results of the field borings and laboratory evaluation, subsurface <br /> conditions can be generalized as follows. <br /> Sparse vegetation/weed growth, as evident in the various site photographs in the Appendix of <br /> this report was encountered at the surface of each test boring. The subsurface materials <br /> encountered beneath the relatively thin surficial layer generally consisted of a zone of sandy lean <br /> clay, lean clay with sand, sandy fat clay and/or clayey sand subsoils which extended to the <br /> bedrock formation below. Siltstone/cl ay stone bedrock with intermitted sandstone lenses was <br /> encountered in each of the Signal Reservoir borings at depths as shallow as 3-feet below existing <br /> site grades in the general vicinity of boring B-9, to as deep as approximately 33-feet in the <br /> general vicinity of boring B-12, and extended to the depths explored, approximately 25 to 40-feet <br /> below existing site grades. The bedrock formation, in general classified as lean clay with sand, <br /> sandy lean clay and/or sandy fat clay. The table below provides a summary of the approximate <br /> depths to bedrock across the Signal Reservoir site. <br /> Test Boring No. Approximate Ground Surface Depth to Bedrock Ft Approximate Bedrock Surface <br /> , . <br /> Elevation Elevations <br /> 1 51430 145 5128.5 <br /> 2 5141.0 245 51165 <br /> 3 5144.0 190 51250 <br /> 4 5147.0 100 51370 <br /> 5 51330 170 51160 <br /> 6 51370 95 51275 <br /> 6 51420 95 51325 <br /> 8 51330 45 51285 <br /> 9 51570 30 5154.0 <br /> 10 5142.0 8.0 51340 <br /> 11 51483 240 51243 <br /> 12 51.48.1 330 5115.1 <br /> 13 51482 360 5112.2 <br /> 1.4 5147.8 275 5120.3 <br /> 15 51.48.2 20.0 51282 <br /> 16 5131.3 230 51083 <br /> 17 1 5130.6 120 51186 <br /> The overburden clay soils were medium stiff to stiff, and generally exhibited permeability <br /> characteristics conducive for earthen liner material. The underlying siltstone/cl ay stone bedrock <br /> encountered in each of the borings was weathered to moderately hard and generally become less <br />