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September 15,2018 <br /> Proje,ct 18-412 <br /> Shovel Ready Project Site <br /> Pequot I,akes,Mi�esota <br /> Floo_ r Slab <br /> We recommend a minimum of 6 inches of clean,free draining washed sand with less than 5% <br /> passing a No.200 sieve be placed beneath the floor slabs. This will provide a capillary break and a <br /> uaiform level subgrade for the floor slabs. We recommend floor slabs be designe�i using a <br /> modulus of subgrade reaction of 200 pounds ger cubic inch. � <br /> We recommend a vapor moisture barrier consisting of minimum 6-mil polyethylene sheeting. A <br /> vapor barrier should be placed under all concrete floors on ground that aze likely to receive an <br /> impermeable floor finish or be used for any purpose where the passage of water vapor through <br /> the floor is undesirable. Floor coverings such as linoleum,vinyl tile,cazpeting,wood,and <br /> synthetic surfacing effectively seal the moisture within the slab where it eventually may loosen, <br /> buckle,or blister the floor covering. , <br /> In order to lessen the moisture post-construction,we recommend using a low water-cement ratio <br /> concrete, less than.45. We recommend allowing the slab a 2-month drying period and testing <br /> the slab moisture condition before installing any floor covering. <br /> Wall BackSil <br /> We assume the walls will be backfilled with on-site sand materials. We recommend all interior <br /> wall backfill be compacted to at least 98%of standard proctor maximum density. Exterior wall <br /> backfill should be compacted to at least 95%of standard proctor maximum density. We <br /> recommend below grade walls be designed using a coefficient of active pressure(Kn)of 0.33,an <br /> at-rest coefficient(Ko)of 0.50,and a passive coefficient(Kr)of 3.0. We recommend below grade <br /> walls be designed using the bulk unit weight of 115 pounds per cubic foot. <br /> E. Pavement Recommendations <br /> The expected subgrade soils consisting of poorly graded sands(SP),poorly graded sands with <br /> silt(SP-SM)and silty sands(S1Vn encountered on this site are classified as A-1-b soils in <br /> accordance with the American Association of State Highway Transportation Officials <br /> (AASHTO)classification system. A-1-b soils aze rated excellent material for use as roadway <br /> Page 7 <br />