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i <br />• <br /> <br /> <br />Mr. Archer <br />13 July 90 <br />Page 3 <br />Volume from embankment bre <br />to high waterline <br />(4220 + 3403) 0.5 X 1.7 <br />Volume from high waterline <br />(3403 - 1581) 0.5 X 3.8 <br />sk-in-slope <br />= 6,480 tuft or 0.149 acft <br />to pond bottom <br />= 9.470 tuft or 0.217 acft <br />Total = 0,366 acft <br />B. Embankment shape is polygonal (nearly rectangular except for <br />the input section) and covers 4220 sgft or 0.097 acres. <br />C. The excavation is 4.0 feet (measured) plus 1.5 feet <br />(estimated water depth) deep = 5.5 ft <br />D. The dewatering device is a 2.0 foot pipe, 30.3 feet in length <br />with a perforated riser topped with a screen mesh. <br />E. There is no freeboard. <br />The ESASP is located on the south side of a hill that slopes approximately <br />27 degrees to the south. The south and west embankment areas vary from <br />14.5 to 17 feet in width and support a substantial canopy of vegetation. <br />There is no evidence of slope failure on the downhill side of these <br />• embankments nor are there any indications that water has overflowed from <br />the impoundment other than through the dewatering device. Outflow from <br />the drainage pipe falls on coarse rock rip-rap on the downslope side of <br />the west embankment. The coarse rock, rip-rapped drainage ditch that <br />carries runoff from the sediment trap to the ESASP appears to be <br />• functioning properly. <br />CMLRB Permit No. C-81-029 design specifications require a 24 inch pipe <br />capable of discharging the 100 year, 24 hour storm peak flow of 12.7 cfs. <br />And the 24 inch I.D, pipe is installed as per specifications. <br />• Two installations at ESASP that are not specified in CMLRB Permit No. C- <br />81-029 are: 1) a 2.5 foot perforated, mesh capped riser welded onto the <br />