Laserfiche WebLink
- 5 - <br />A 25 -foot long kidney shaped boggy area was observed on the downstream slope of Dam 2 <br />in 1984. The 1985 remedial measures consisted of placing a 3 -foot thick layer of filter <br />material, a drain pipe and a 5 foot thick earth berm over the seep area. Due to downstream <br />slope stability concerns, an earth berm consisting of a 15 -foot wide shoulder and a toe drain <br />system was constructed in 1988 along the entire length of the darn - <br />Seepage continues from Dam 2 and is periodically monitored at weirs and drainpipes which <br />collect the seepage water. Information provided to, us indicates the :uvater is free of <br />sedimentation. Seepage or wet areas have not been observed`on the downstream slope or at <br />the dam toe since the construction of the drainage facilities and; stabilizing berms. <br />2.4 Dam 3 <br />Dam 3 is approximately 1,400 feet long and ?. approximately 40 feet high at the maximum <br />section with a crest width of approximately 20 feet. The upstream face of the dam has slope <br />of 1.7:1 to approximately 20 feet below the crest. Below that depth, we understand the <br />upstream slope flattens out to due to sediment accumulation at the toe. The upstream slope <br />is paved with concrete for slope 'protection- and has a 3 -foot high concrete parapet wall for <br />wave runup protection. <br />The downstream face of the dam.As non- uniform. The slope near the crest is steep for the <br />upper 8 feet. The stabilizing berm constructed at the base of downstream toe in 1987 is 13 <br />feet wide at the top andl has a slope of 2.5:1. The berm has sand filter blanket and toe drain <br />system and was constructed to address concerns of seepage at the downstream toe and slope <br />stability. <br />Seepage discharge from the embankment drain has continued and is periodically monitored by <br />the owner. The "discharge is reported to be free from sedimentation. <br />2 \reports \97- 1- 500.nk <br />