|
Spatial Analysis and Decision Assistance
Cost Benefit Analysis
SADA can produce site-specific cost-benefit curves that demonstrate the
specific relationship between a given remedial cleanup goal and the corresponding
cost. This cleanup goal can be a custom concentration value,
a human health risk scenario ,
a ecological risk level , or a
custom criteria. Furthermore, the relationship can be evaluated
under the Site or Block decision framework.
The following figure demonstrates the cost associated with a range of
concentration goals under the Site decision framework.
The following figure demonstrates the cost associated with a range of
block concentration goals for two confidence levels (90% and 80%). There
are two ways to interpret this example graph.
- For an established concentration goal (3.35), the difference in cost
for the two remedial confidence levels is the difference between the
two lines at X = 3.35. In particular, the cost of cleanup at 80% and
90% confidence levels is respectively $1217 and $1559. This corresponds
to a difference of $342.
- For an established confidence level (90%), the relative difference
in cost between any two cleanup goals is given by the vertical difference
between their points on the 90% line. In particular, the cost to cleanup
to 3.35 with a 90% level of confidence is approximately $1559. The cost
to cleanup to 2.55 at that same level is $1960. The corresponding difference
is $401.
The following cost-risk relationship for human health residential risk can be interpreted
similarly. This particular graph demonstrates that from a risk perspective
the site requires no remediation, assuming a standard EPA cleanup risk
goal of 1E-6.
|
