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( <br /> ' Hart Crowser <br /> J-344fr01 <br /> which should be p]ace� at 95 percent modified Proctor maximum <br /> dry density; <br /> ► The moisture content of the fill should be controlled within two <br /> percent of the optimum moisture. Optimum moisture is the <br /> moisture content corresponding to the maximum Proctor dry density; <br /> ► Import a select so�7 to be used as structural fll if additional �1 <br /> material is needed. We recommend using a clean, well-graded sand <br /> or sand and gavel with ]ess than five percent by weight passing the <br /> No. 200 mesh sieve (based on the '/.-inch minus fraciion); <br /> ► In wet subgrade areas, clean material with a gavel content (materia] <br /> coarser than a U.S. No. 4 sieve) of at ]easi 30 to 35 percent may be <br /> necessary; <br /> ► If small, hand-operated compaction equipment is used to cnmpact <br /> structural back�il, fill lihs should not exceed 8 inches loose <br /> thicl�ess. If compaction is proven to be attainable wich 10-inch lifts, <br /> thicker lifu can be used; and <br /> ► Any material to be used as s�uctural fll snould be sampled eiiber <br /> from the site or fram the supplier's pit to determine thn maximum <br /> dry densiry and gradation. <br /> FeYVII20NME'iVTAI, CONSIDLI2ATIONS <br /> We recommend that Hart Crowser's environmental property assessment <br /> � be reviewed prior to any subsurface work design. Key observations <br /> from the environmenta] assessment worth reiterating include: <br /> ► A former underground storage tank was located near the proposed <br /> new office annex <br /> ► Waste o�7 drums were observed on the north side of the ez�sting <br /> warehousc. <br /> Page�l}� <br />