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<br />Oct-31-Z00Z 11 :3Zam From- <br /> <br />T-S99 P.003/008 F-9rZ <br /> <br />Mr. Jim Norfleet, P.E, <br />Mr. Jack Byers, P.E. <br />Page 2 <br /> <br />July 11, 2002 <br /> <br />1 , The apparent loose fill material on the downstream embankmenf will be <br />excavated and recompactedfreplaced, <br /> <br />2, Unsuitable organic . material (discovered in the temporary toe drain <br />installation) needs to be removed from under the existing embankment <br />and the footprint of the proposed additional embankment described in <br />item 3 below. <br /> <br />3, Additional compacted embankment will be required to provide room on <br />the dam crest for instrumentation, piezometers, and a 30 foot wide <br />paved road. <br /> <br />4. The existing 36 inch CMP spillway pipe will be removed and replaced <br />with a smooth wall Interior pipe. A head wall and trash gate will be <br />constructed on the upstream embankment to minimize the potential for <br />seepage along the pipe trench and to protect the pipe from debris <br />blockage. <br /> <br />5. The depression located on the upstream embankment will be excavated <br />and evaluated. Excavation will be backfilled with suitable compacted <br />material. <br /> <br />6. A seepage drain blanket will be constructed under the downstream <br />embankment extending up the abutments and a chimney drain will be <br />installed between the old embankment and new embankment. A toe <br />drain will be constructed to collect seepage from the chimney drain, <br />drain blanket and the abutments. <br /> <br />7. Survey monuments to monitor movement of' the embankment and <br />piezometers to monitor seepage through the dam will be installed at <br />several locations along the dam and abutments. <br /> <br />8. The road across the dam will be recon8tru~ted with two 11 foot driving <br />lanes and 4 foot shoulders for a total paved width of 30 feet. <br /> <br />9. The identified void area will be excavated and backfilled with suitable <br />compacted material. <br /> <br />EMBANKMENT <br /> <br />Existing Embankment <br /> <br />The existing embankment consists of gravel, cobbley to bouldery, silty to clayey, with <br />organics noted in the apparent loose fill on the downstream embankment. Soil. test <br /> <br />1111!!CJE::Cnllcrt::' <br />