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� <br /> � structurai fiil material water co • , <br /> ntent is excessively dry below optimum range, the matenal s water <br /> � content should be adjusted upward to make it suitable structural fill meeting this range. Blending <br /> this drier material with wetter material to make suitable structural fill meeting this range may be <br /> considered. <br /> � CONSTRUCTION MONITORING AND DRAINAGE Excavation and earthwork co <br /> nstruction must <br /> be monitored periodically to evaluate compliance with recommendations in this report. Monitoring <br /> Ishould be perfomned by an engineering technician from our company with engineering supervision. <br /> Drainage must be provided to prevent surface water run-off from wetting, accumulating, and <br /> Istanding in open excavations. Gravity drainage ditches or other methods can be considered. <br /> OSHA EXCAVATION SAFETY Vertical cuts and excavations should not be considered stable in <br /> ( any case. All excavations should be sloped back, shored, or shielded to protect workers. <br /> Trenching and excavation activities must conform to federal, state and local regulations at a <br /> minimum. The design maintenance of temporary slopes is the responsibility of the contractor. The <br /> natural topsoil and glacial outwash encountered in the Borings generally classify as Type C soil <br /> according to OSHA standards for excavation; Horizon B soil and supraglacial till generally classify <br /> as Type C soil. Maximum allowabte slope for shallow excavation in Types B and C soils is 1:1 and <br /> 1.5:1 (horizontal: vertical) respectively, although other provisions and restrictions may apply. <br /> According to OSHA, submerged soil is underwater or has freely seeping water, submerged soil is <br /> Type C with maximum allowable slope of 1.5:1 (horizontal: vertical), although other provisions and <br /> restrictions may apply. <br /> OVER-EXCAVATION AND STRUCTURAL BACKFILL <br /> Unsuitable soil and materials must be completely removed beneath buildings, pavements, other <br /> structures and bearing grades of foundations, floor slabs and structural fill. Unsuitable soil is <br /> defined in the EXCAVATON AND EARTHWORK section of this report. Exposed soil along bearing <br /> grades of foundations, floor slabs, structural fill and pavement must be observed and tested by our <br /> company under engineering supervision. If exposed soil is unsuitable, the engineer will review this <br /> condition, which may require that it be removed by over-excavation and replaced with structural <br /> bac�ll. The engineer must determine depth and bottom width of over-excavation. The over- <br /> excavation bottom must be pr�pared according to the STRUCTURAL FILL SUBGRADE section of <br /> this report. The over-excavated bottom must be made flat or stepped and not sloped. <br /> Structural backfill must extend at least 3 feet laterally oufinrard from foundations, floor slabs, <br /> designated structural fill and pavement, and it must have a 1:1 slope to the over-excavated bottom <br /> grade. Where over-excavation is made in very soft soil, structural backfill must extend at least 5 <br /> feet laterally outward from foundations, floor slabs, designated structural �II and pavement� and it <br /> must have a 2:1 slope (horizontal: vertical) to the over-excavation bottom grade. Structural backfill <br /> must meet recommendations in the EXCAVATION AND EARTHWORK section of this report. <br /> Based on our experience with similar projects, crushed limestone screenings (3/8ths inch to dust <br /> sized) or roadstone used by the Minnesota Department of Transportation (MnDOl� work well as <br /> structural backfill. <br /> Allied Project 05039 �p July 31, 2005 <br />