Environmental Engineering Reference
In-Depth Information
N
Legend
Areas of
impact
Surface spill
0
25 m
Industrial manufacturing
building
Former drum
storage area
Aboveground
storage tank
Surface spill
Gravel
Former storage area
Asphalt
Industrial
manufacturing
building
Gravel
Gravel
FIGURE 6.4
Generalized site map of Site 1 located in a low vulnerability area.
• Stained soil and stressed vegetation were observed at a location of bare ground
where deliveries to the facilities were conducted, and where materials including
liquids were offloaded from trucks.
The initial Phase II investigation involved drilling 15 soil borings in areas with the highest
likelihood of detecting contamination. This initial subsurface investigation had the fol-
lowing objectives: (1) begin to characterize the subsurface geology of the site, (2) identify
the contaminants that were suspected to have been released, and (3) evaluate the magni-
tude of contaminants present by collecting and analyzing “worst-case” samples from each
area of suspected contamination.
The results confirmed the presence of contamination at five of the six RECs identified
during the Phase I environmental site assessment. Those compounds detected were at
significant concentrations and required further evaluation. The current storage area was
eliminated as an area of concern because contamination could not be confirmed through
the drilling of three soil borings into the most visibly vulnerable areas of the concrete and
the analysis of six soil samples.
Three additional investigation phases were conducted to define the nature and extent of
contamination. During the subsequent phases, a total of 40 additional soil borings were
drilled and six monitoring wells were installed to evaluate whether there was enough
groundwater present for analysis and to establish the direction of groundwater flow. In
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