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3 One boring (B-lo) was drilled to a depth of 26.5 feet bgs in the area of the truck loading dock
A
tj well.
Ten 10 borings (B-11 through B-20) were drilling in parking and interior access roadways_
Boring locations are shown in Figure 2. Each of these borings were drilled to a maximum depth
me
of 11.5 feet bgs.
More detailed descriptions of subsurface conditions encountered at individual exploration
locations are presented on the boring logs in Appendix A, Field Exploration, which also includes
a description of exploration and sampling procedures. A discussion of laboratory test procedures
is presented with laboratory test results in Appendix B.
Based on the conditions encountered, we characterized the soils and developed the genera
stratigraphic profile described below:
a
Fill: Fill, apparently placed several decades ago_ mantlrs the native soils on the property
.t and consists of two lavers. The upper laver comprises dense sandy gravel pavement base
material. This layer was encountered beneath the asphaltic concrete pavement and varies
in thickness from 1 to 2.5 feet.
a Beneath the upper laver of fill, we encountered mosth sandy silt and silty sand_ This
lower fill unit is gray to brown, dry to moist, non -plastic and medium dense. Portions of
this lower fill contain small amounts of gravel or peat material. The entire fill unit
extends to a depth of at least 11.5 feet bgs throughout the site. B-17 was terminated in
this unit.
Interbedded Post -Glacial Floodplain Deposits: Post -glacial floodpiain deposits were
encountered beneath the fill unit and consist of organic materials and delta:: and alluvial
sediments. The organic materials are dominantly peat, with beds of organic silt and clay
" in areas. The deltaic alluvial sediments are mainly loose sand, which tend to coarsen
a downward.
1 A layer of peat occurs immediately beneath the fi'_1 material throughout most of the site.
-4 This laver is found in 15 of the 20 borings drilled. In B-3 and B-1, which are located
within the proposed building footprint, organic silt and clay lenses were found directly
11 under the fill. A peat layer was encountered below the organic silt in B-3. The peat layer
was generally 1 to 2 feet thick.
-7 Beneath the peat layer, we encountered a complex interbedded sequence of peat, organic
silt and clay, inorganic silt and clay, fine- to medium -grained sand, and gravelly sand
lenses. These sediments are characteristic of an active floodplain, and represent different
depositional environments. The peat and organic silt and clay represent swamps, marshes
and shallow abandoned river channel and lake environments- The silt and sand lenses
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