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C <br />INTRODUCTIO <br />The Deepe Farm lit site is located southeast of the intersection of Highway <br />and Table Mesa Drive in Boulder, Colorado. Sand and gravel has been mined <br />from the pit for several decades. ]lining was stopped in 1 996 and reclamation of <br />the pit continued. <br />The gravel pit is protected from flood waters from South Boulder Creek by <br />a levee on the south and east sides. Reclamation of the gravel pit included <br />maintenance w on the levee. <br />The levee is part of the flood control system that is in place at certain <br />locations along South Boulder Creek and is under the oversight of the Federal <br />Emergency Management Agency ( FEMA). Therefore, the Deepe Farm Rlt levee <br />needs to meet FEMA criteria. This report conveys the results of our ge technical <br />evaluation of the levee. Soils in the levee and the levee foundation are described <br />and their engineering properties identified. Slope stability, seepage and settlement <br />analyses were conducted. Results ult of the ge technical evaluation of the levee are <br />compared to FEMA criteria. A s ummary o conclusions is presented below. <br />SUMMARY <br />Re of geotechnical evaluation indicate the levee meets FEMA <br />criteria for slope stability and piping through and under the levee. <br />2 . Test holes and test pits drilled Mom the levee crest penetrated 5 to 1 <br />feet of levee fill consisting of dense, clayey, gravelly to c bbly sand <br />overlying natural foundation soils consisting of mostly dense to very <br />dense clayey, gravelly to cobbly sands with occasional layers of stiff <br />to very stiff sandy clays. Clay tone bedrock was encountered in one <br />test hole at a depth of 16 feet below the levee crest. Test pits <br />excavated on either side and at the toes of the levee penetrated dense <br />to very dense, cla gravelly and eobbly sands and very stiff, highly <br />weathered claystone bedrock. <br />3 . Free ground water appeared during drilling in three of the test holes <br />drilled from the levee crest at depths between 11 and 14 feet and in <br />four of the test pits e at the toes of the levee at depths <br />between 3.5 and 4 feet. <br />FLATIRON COMPANIES <br />LEVEE A DEEPE FARM PIT .� <br />TUT 25,3135 <br />