1920 MERRILL CREEK PKY 2018-01-01 MF Import

I SHANNON F�WILSON,INC. loose, soft, organic, or otherwise unsuitable soils. Stripping and iemoval of flll, weathered Isoils, and other unsuitable soils s�iould artend laterally a minimum distance of 15 feet beyond building limi�s. 8.4.2.4 Determination of SLberade Acepptabilitv IIn flll or at-erdde reac, the exposed soil surface after stripping and prior w , fill placement should be compacted in place to a dense and unyielding condition and to at i least 95 percent of its Modified Proctor mazimum dry density as determined by ASTM D 1557. The compacted surface should then be proof-rolled with a fully loaded, tandem-axle, I10-}ard dump truck, or equivalent. In areas that will require accavation, the exposed surface should be compacted and proofrolled, as described above, after the subgrade Ielevations a�e ieached. Areas that are idend6ed as loose during proof-rolling should be further wmpacted, if possible, or should be averexcavated and replaced with compacted I structural fill or mized with cemendlime and stabilized in-place. Areas that are identified as soft or yielding should be rxondidoned and recompacted, replaced with compacted I structural 811, or modified with cemendlime so that a dense and unyielding surface is achieved. Care should be taken to avoid disturbing subg�ade soiLs and supporting sotls that will remain in place, as they will rut aod pump under repeated construction Itra�c. On recent projecs, we have obsernd an increased tevel of performance of cement- modified subgrades of similar nadve soils subject to lazge, channelized, construcdon ttaffic. 8.4.3 Excavation Excavadons tY:at are incidental to site gnding should be backfilled wiUt compacted materials as specified in Sections 8.4.4 and 8.4.5 of this report. We anGcipate that the fill and near-surface soils observed in the explo�adons can be � excavated using convendonal excavadng equipment, such as backhces, dozers, or front-end loaders. Hard digging should be anticipated by the conttactor in till-like soils as well as in Iglacial till. Excavation in such soils may require the use of tractor-mounted ripper teeth for lazge areal cuts, and the use of hce-rams or hand-operated pavement bcealcers for small � excavations, such as those for utilities. Although cobbles and boulde� we�e not enco�ntered � W-6693-01 � 17