1920 MERRILL CREEK PKY 2018-01-01 MF Import

�c i I SHANNON�WILSON.INC. on-site soils as structural fill, the soils observed in our explondons are divided ��W two Itypes: 1) glacial till-like and tili soils and 2) flll and weathered nadve soils. I The glacia�., till-like soils observed in our explordtions consisted of dense w very dense, brown to light gray, trace of gcavel W gravelly, silty sand and sandy silt with occasional trace of clay and interbedded wet seams. The natural wnter content of these soils Iranged from 11.2 to 17.7 percent in the samples taken in the acplorsdons, with an average I of about 13.5 percent. These moisture contents arc estimated w be above the opdmum moisture content for such soils, with most measurements being slightly above and some substantially above the estimated optimum values. In our opinion, most of these soils may � be ceused as swctural fill in their present state, pcovided the conswcdon is done during dry weather and provided they are not disturbed. It should be noted that the wet seams within ; these soils would need to be sepacated in the fie1�1 during construction since they would nced � aeration or treatment with lime/cement (discussed later in this secGon) in order to achieve proper compaction. The fill and weathered native soils encountered in our acplorations shawed Iconsiderable variation in weter contents, ranging fmm 11.4 to 43.1 percent, with an average of about 2� percent. Some of these soils were in the range of 11 to 15 percent and could be Ireused as structucal fili in their pnesent state, provided they are maintained in an undisturbed � state. On the other hand, some of the soils had water contenu in the range of 30 to 40 percent and w�uld require considerable aeration or other treatment. AddiGonally, some of � the latter soils contained significant ocganics and should not be considered for swctural fill. I Depending on the contcactor's construcGon schedule and time of year, aeraGon may not be feasible, and the wet soils may have W be wasted off-site or reused in landscape areas. I Altematively, these soils could be treated with lime or cement, although such addi6ons are not successful with high quantities of organics. On the whole, it is our opinion u�: these soils could be reused as structunl fill in dry weather, but most would require aera6on and Iheatment with lime or cement. In addition, field sorcing would have to be accomplished during construction to sepazate soils containing organics and stumps from non-organic � portions, particularly in the existing fill. I We understand that there will be wnsiderably more accavation than fill on the site. With this in mind, it is our opinicn that :hc fill and weathered native soils should be I W-6693-01 19