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.Merila and Associates <br />STS project 93492 <br />December 19, 1984 <br />-14- <br />soil should be removed and replaced with properly placed .and compacted <br />fill prior to the placement of any aggregate. We recommend that an STS <br />Technician observe this proof -rolling operation. We would be pleased <br />to comment further on the design of bituminous drives and parking areas <br />once traffic design loads are known. <br />Construction Considerations <br />.t <br />During the excavation of these fill and organic soils, it is likely <br />that perched ground water coi,ditions will be encountered at various <br />locations and elevations across the site. It is our opinion that the <br />influx of water will be relatively slow and should be controllable <br />through standard sump pit and pump operations. If feasible, we <br />recommend that a test pit be dug prior to construction to determine <br />water inflow rates and appropriate dewatering schemes. We recommend <br />that all standing water and loosened or softened soils be removed from <br />r the excavation bases prior to the placement of any structural fill or <br />foundations. If winter construction is planned, we recommend that the <br />foundation subbase soils be protected from freezing. We recommend that <br />ice and snow be removed from excavation bases and that no structural <br />fill or foundations be placed on frozen soil. <br />The side walls of any excavation must be adequately sloped, or sheeted <br />and braced, in order to provide adequate stability. This must be <br />carried out in accordance with pertinent OSHA regulations in order to <br />provide maximum safety for the personnel working in the excavations. <br />' It is solely the responsibility of the contractor to make such pro- <br />visions for personnel safety. <br />M <br />