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4.0 DISCUSS�ON AND RECOMMENDATIONS <br /> 4.1 Proposed Construction <br /> The project will consist of r onstructing the e�dsting car parking lot and possibly <br /> consh ucting a storm water �tration basin. No specific grading plans for the new <br /> parking lot were available at e time of this report. We assume that some new storm <br /> sewer utilities and structures wiittll be associated with the new parldng lot. <br /> 4.2 Discussion I <br /> In general,borings SB-1 thru SB�3 encountered about 2 to 6 inches of bituminous over 4 to <br /> 8 inches of aggregate base unde9rlain by silty sand and sandy lean clay glacial till soils to <br /> the tPrn,ination depths of the rings. Boring SB-4 encountered about 1'/z feet of clayey <br /> topsoil underlain by sandy lea�ii clay soiLs to the termination depth of the boring. The <br /> glacial soiLs are generally suital�le for pavement support but are relatively impermeable • <br /> and generally unsuitable for i.nfi�tration. <br /> Groundwater was not encounte�ed in borings while drilling or to cave-in depths of 11 to <br /> 13 feet after removing the a�ger from the boreholes. We do not anticipate that <br /> groundwater will encounfiered during utility and pazking lot construction. <br /> The following sections provide�ecommendations for site development. <br /> 4.3 Parlcing Lot Recommendati,bns <br /> We assume the existing pavem�nt will be reclaimed, stockpiled and used as aggregate <br /> base in the new parking lot. W�ere the new parking lot will be constructed beyond the <br /> e�dsting pazking lot,we recomm�nd the vegetation and topsoil be removed.The following <br /> table indicates the anticipated I�ccavation depths at �he boring locations. Excavation <br /> depths may vary and could be c�leeper. <br /> Table 2. Antici ated ass Gradin Fxcavation De <br /> Anticipated <br /> Boring Surface Anticipated �avation <br /> Number IIevation Excavation Depth ��,ation <br /> (feet)* (feet)* feet" <br /> SB-1 963.6 1 9621/2 <br /> SB-2 960.4 1-4 9591/z-9561/z <br /> SB-3 956.9 1-4 956-953 <br /> SB-4 951.3 1 9501/s <br /> *Excavation depths and el vations were rounded to the neazest 1/z foot. <br /> � The sandy lean clay soils enco tered at borings SB-2 and SB-3 should be removed and <br /> replaced with engineered fill r scarified, dried and compacted to provide a stable <br /> pavement subgrade. Where ex avations for soil corrections extend below the proposed <br /> pavement elevations oversizin (widening) of the excavations will be required. This <br /> oversizing is required to provi e lateral support of the replacement backfill and the <br /> 4 <br />