Organic Soils 



A stratum of organic soils consisting primarily of sandy 

 organic SILT and PEAT was found to overlie the glacial till and 

 marine sands. The organic sandy silt generally contains 

 shells. The salt marsh peat encountered on-site accumulated 

 along the shore line during a slowly rising sea level. The 

 organic silt and peat typically ranged up to 15 ft. in 

 thickness, where encountered. 



Miscellaneous Fill 



The man-made layer of fill placed across the site to the 

 present grade primarily consists of an unsorted mixture of 

 coarse to fine sand, silt, clay, and fine gravel with varying 

 amounts of wood, cinders, brick, slag and concrete. The 

 thickness of this stratum varied from 5.0 to 15.0 ft., based on 

 the most recent subsurface explorations. 



Evidence of petroleum contamination was noted in the first two 

 samples obtained from BlOl, which was drilled over water. The 

 materials encountered in this boring are indicative of typical 

 harbor bottom sediments and are not believed to be 

 representative of the overall quality of on-site fill material. 



Refer to our "Report on Preliminary Geotechnical Evaluation, 

 Tudor Wharf, Charlestown, Massachusetts" for a more detailed 

 description of subsurface conditions including subsurface 

 profiles drawn in both North/South and East/West orientations 

 across the site. 



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