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Section 1.0 <br /> ' Introduction <br /> 1.3 Purpose and Scope of Services.! <br /> f <br /> jThe purpose of CDM's study was to obtain relevant site information regarding the <br /> geotechnical and environmental conditions to develop specific design criteria relating <br /> to the construction of the temporary excavation support system. <br /> Specifically,our services included: <br /> ■ Performing subsurface investigation was to characterize the engineering <br /> properties of the soil and groundwater elevation in the vicinity of the new wall. <br /> ■ Evaluating potential soil and groundwater contamination to allow planning for <br /> proper handling procedures for future soil excavation and construction <br /> dewatering. <br /> ■ Evaluating various construction alternatives and recommend the(most <br /> appropriate option(s). <br /> i .Developing conclusions and design recommendations for the recommended <br /> 4 option(s) including: <br /> Lateral earth'pressures for the permanent and-temporary support walls. <br /> - Backfill materials including evaluation for suitability of the onsite <br /> materials for use as backfill, requirements for imported fill,"fill placement, <br /> and compaction. ' <br /> f <br /> Stability of the pump station and the wet pit during construction. <br /> t. A liquefaction analysis is not included in our scope of work, and, therefore,was not: <br /> i . <br /> completed. (The subsurface conditions suggest that the sandy layer located between <br /> 25 and 35 feet bgs is liquefaction susceptible, and,thus,this report does recommend a <br /> liquefaction study be performed.) <br /> CDM c..,p Dsur sz McKee h= 1-2 <br /> j i 0:1250042824"Eo-T4-ReparttBmokside Pump StAon.doc <br />