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Kraus-Anderson Realty Company <br /> Project BL-11-01014 <br /> March 18, 2011 <br /> Page 9 <br /> D.2.b. Excavation Support <br /> Based on the composition of the soils encountered, we recommend that site soils be classified as Type B <br /> soil under Occupational Safety& Health Administration (OSHA)guidelines. Unsupported excavations <br /> should be maintained at a gradient no steeper than 1:1 (horizontal: vertical). Slopes constructed in this <br /> manner may still exhibit surface sloughing. If site constraints do not allow the construction of temporary <br /> slopes with these dimensions, then temporary shoring may be required, and we should be consulted for <br /> additional recommendations. <br /> An OSHA approved competent person should review this soil classification in the field. Excavations must <br /> comply with the requirements of OSHA 29 CFR, Part 2926, Subpart P;Excavations and Trenches.This <br /> document states that excavation safety is the responsibility of the contractor. Reference to these OSHA <br /> requirements should be included in the project specifications. <br /> D.2.c. Placement and Compaction of Backfill and Fill <br /> We recommend that fill and backfill be placed in loose lifts no thicker than 12 inches. Smaller compaction <br /> equipment may require thinner lifts to meet specified density. On site soils free of organic matter and <br /> debris,and at a suitable moisture content, can be reused as engineered fill material at this site. Imported <br /> fill soils should consist of granular soils with less than 20 percent by weight passing a size No. 200 sieve <br /> with the exception of deep fill areas as discussed in Section D.2.d of this report. Recommended soil types <br /> and relative compaction (standard Proctor method)for fill in various areas of the site are shown in the <br /> table below. <br /> Table 2. Compaction Recommendations Summary <br /> Recommended Relative Compaction Moisture Content <br /> Reference Soil Type for Fill (ASTM D 698) Variance from Optimum <br /> Below Foundations On site Clays or Imported 98% 1/o 0 to+3% <br /> Granular Soils <br /> Below Slabs On site Clays or Imported 95% <br /> -1%to+3% <br /> Granular Soils <br /> Below Pavements On site Clays or Imported <br /> (upper 3 feet) Granular Soils 100 1%to+3% <br /> The on-site topsoil or existing fill containing organic matter or other debris should not be used as fill or <br /> backfill material.The suitable fill soils, alluvial soils and glacially deposited soils, except for silts, <br /> BRAUN <br /> INTERTEC <br />