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BOOK AG PAGE J 11.G.3. KINGS HIGHWAY (58TH AVENUE) BIPROVEMENTS - SELECT FILL - DICKERSON FLORIDA - CHANGE ORDER NO.2 The Board reviewed a Memorandum of September 2, 1998: TO: James Chandler County Administrator THROUGH: James W. Davis, P.E. , Public Works Director,- / FROM: Terry B. Thompson, P. E. Cwo1 Capital Projects Manager SUBJECT: Kings Highway Roadway Improvements Select Fill Change Order No. 2 DATE: September 2, 1998 DESCRIPTION AND CONDITIONS Construction of the Kings Highway roadway section consists of excavating existing soils two to three feet, placing geogrid over the exposed soils, placing and compacting two feet of "select fill" over the geogrid, placing and compacting a one foot subgrade followed by a coquina base and asphalt surface. Materials for the two foot layer of "select fill" and one foot subgrade are available in the borrow areas provided by the County. Three of the borrow areas are needed for stormwater retention. The fourth area was a second (south) pond at the Mueller Center to provide stormwater retention for the future expansion of Indian River Community College (IRCC). The majority of the "select fill" needed for the project was to be provided from the two ponds located at IRCC. The excavation of the north pond at IRCC is complete and the materials are stockpiled on the IRCC south pond site. The stockpiled "select fill" meets the projects requirements of having less than 12% fines. There is currently no FDOT or AASHTO specification that addresses the composition of the fines. Laboratory tests indicate that the 9% -11 % fines in the "select fill" are silt and clay. Field moisture tests made at various times in the stockpiled material have been on the order of 20% - 25% (by dry soil weight). The contract specifications require that the "select fill" be dried to, or below optimum compaction moisture (11% - 12%) prior to placement in the embankment. Material which is placed wet of its optimum compaction moisture exhibits pumping and yielding under construction traffic until it is dried in-place to a moisture content that is at or below its optimum compaction moisture. The "select fill" has been stockpiled for approximately five (5) months with little change in moisture content. On August 14, 1998 the soils consultant, Dunkelberger Engineering and Testing, Inc., agreed to adjust the project specifications regarding the moisture condition of the "select fill" at the time of placement, if Dickerson would commit to drying the material in-place. The Contractor, Dickerson Florida, Inc., agreed to construct a 500 foot long test section to see if the "select fill" material could be dried in-place. Construction of the test section started on August 17, 1998. The moisture content of the fill at the time of placement varied September 8, 1998 50