This is the first time for me to investigate a peat site. Let me first answer your questions:
1) Based on historical maps and aerial photos, the alluvial fill is present for at least 40 years.
2) The groundwater measured in Borings performed in Winter 1991 is ~ 5 below ground surface. Recent...
I am currently working on a site with peaty soils. The site is capped with ~5 feet of alluvial fill and then underlain by 5 to 10 feet of soft to medium stiff peat. Beneath the peat is soft clay of approximately 5 feet thick. Medium stiff to stiff sandy clay, clayey sand and clayey silt deposits...