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77MZ 77,71 71117=1 7? 1 <br /> a <br /> 17 <br /> Oslo Road Improvement Project Page 7 <br /> File No . 11 -5420 <br /> In an attempt to minimize disturbance of the plastic A-2 - 6 soils which are to remain as indicated <br /> on the project plans , it may be prudent to utilize relatively light compaction equipment during <br /> Proof rolling and other compaction operations in areas where these soils exist near the surface . We <br /> recommend static rolling the subgrade to minimize potential "softening" of the plastic material ; the <br /> vibrations created by a vibratory roller may result in capillary rise of the moisture in the clayey <br /> material and subsequent deterioration of the integrity of this stratum . Please note that these <br /> suggestions may necessitate the compaction of roadway materials in lifts thinner than those <br /> typically recommended . <br /> Careful engineering inspection should be performed during all phases of the earthwork . Any <br /> indications of soft or yielding areas may require further explorations . Over-excavation of plastic <br /> soils that yield during proofrolling and subsequent base construction , and replacement with <br /> compacted sandy backfill may become necessary in some areas . <br /> We note that organic very clayey fine sand ( muck) was encountered in Boring HAB-23 (Station <br /> 88+ 00) at depths from about 1 . 8 feet to 6 feet below the ground surface . These organic materials <br /> are classified as A-8 soils and should be removed in accordance with FDOT Standard Index 500 <br /> unless otherwise indicated on the project plans. The extent of the A- 8 soils in this area can be <br /> determined during construction or with additional borings. <br /> Should any canals or ditches be reclaimed (or filled) for roadway construction , we recommend <br /> conducting further explorations relative to exploring the extent of unsuitable soils beneath and <br /> within the canals or ditches, including additional soil borings and canal/ditch bottom probes . <br /> We also recommend that the designer add notes to the plans relative to potential difficulty in <br /> dewatering , using strict moisture control and any special compaction equipment for A-2-4 and <br /> A-M soils , maintaining positive site drainage and wrapping pipe joints . <br /> R <br /> 5 <br /> 9 M <br /> w <br /> r <br /> s <br /> C ' <br />