VI. SUMMARY AND CONCLUSIONS 



This report presents the results of our preliminary 

 geotechnical studies for the proposed Tudor Wharf development. 

 The studies were based on the plans for the project prepared by 

 CBT. The recommendations presented herein are subject to 

 modification or revision as additional field data become 

 available and as the design evolves. The following is a 

 summary of preliminary conclusions and recommendations 

 developed during our studies to date. 



A. Building Foundations 



o The office structure should be supported on individual 

 spread footings bearing on the glacial till soils at 

 bearing pressures between 5 and 20 TSF. 



o The excavation for the three- to four-level 



below-grade garage area should be supported by a 

 concrete diaphragm (slurry) wall. 



o A combination of internal and external bracing will be 

 required to support the slurry wall depending on its 

 final location relative to the harbor. 



o A permanent underdrain system is required beneath the 

 lowest level basement slab to relieve the hydrostatic 

 uplift pressures. 



o The alignment of the south perimeter wall of the 

 proposed garage should be shifted north to avoid 

 difficulties with the existing granite block wall and 

 the tidal zone. 



o The pier structure should be supported on deep, 



end-bearing pile foundations. Currently, precast, 

 prestressed concrete piles are believed to be the most 

 economical pile type for the project. 



o It is recommended that the walkway connecting the 

 office and pier structures should be relocated at 

 grade to avoid design and construction difficulties 

 and high costs associated with its present location. 



B. Site Development 



o Placement of additional fill within the site area will 

 result in settlement of the organic soils and may 

 effect existing or proposed utilities. Grade raises 

 should be kept to a minimum (less than 1-2 feet) . 



AQX 



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