400 SIEVERS-DUECY BLVD 2016-01-01 MF Import

i� . � SFiANNON SVNILSON.INC. � Groundwater was encountered at depths of 50 feet and 60 feet boring B-4. Groundwater waa 4 measured at a depth of 100.5 feet in monitoring well MW-3. � 4.0 CONCLUSIONS AND RECOIvIMENDATIONS The proposed attiletic fields facility will consist primarily of fill placement and grading work, � however,it will also include pavements and lightly loaded ancillary structures. Based on the data obtained from the subsurface explorations and our experience with similar projxts, �' engineering studies were p�:formed to develop recommendarions regazding the geotxhnical � aspects of this project. The following sections present our conclusions and recommendations � regazding site grading,estimated setUements, foundations and pavements. r 4.1 General Site Grading 4 Based on our review of the site gruding plan,�ve unde:stand that the project is intended to be a balanced cut and f Il oper:-?�on. The results of the subsurface explorations indicate that the soils i that will be excavatea dur;ng site grading wnsist of loose to medium der.se, silty fine sand with fine to coarse gravel. In our opinion,t:iese materials can be excavxted using convenrional I j cxcavating equipment. It should be noted that some of the soils at the site may have a high silt contents and are therefore highly susceptible to moisture changes. These soils can deteriorate � quickly when exposed to water and become soft and difficult to handle. Excavation of soil and � movement of construction and excavating equipment can become difficult under these �i condiiions. Placement of these materials with systematic compaction can also be difficulf or impossible during wet weather. We recorrunend that site Bading,rough and final,be i accomplished during the dry weather months. On-site fill materials that will bc excavated as part of site rough gradiug operations may have moisture contents above the optimum for compaction. I These materials may require aeration during dry weather in order for adequate compaction to be '. achieved. i Prior to placement of fill under ballfielCs or paved surfaces, the azeas should be cleazed and 1 stripped of all as�+halt, concrete,organics,wet and unstable soils, and other unsuitable materials. i The exposed soil surface after clearing and stripping should be compacted in place to a dense and unyielding condition and should be proof-rolled to identify unstable soils that should be removed � or recompacted. Proof-rolling sliould be accomplished by making repeated passes with a fi�lly loaded dump truck or front-end loader under continuous observation of a geotechnical engineer. � Exposed subgrades for paved pazking lots,paved driveways and sidewalks should be compacted � W8628�OI.rpi/wp/sjm W8628-01 � � 3