Environmental Modeling Community of Practice

EPA On-line Tools for Site Assessment Calculation

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Knowing the starting date and ending date for the spill, we can use the one dimensional pulse calculator to evaluate the peak concentration, arrival date and duration of MTBE impacted water above the 50 ppb limit at the channel.

Enter the aquifer parameters into the pulse source model that we had previously listed:

Prior Input Values

Parameter	Value
Hydraulic Conductivity (from pump test)	216 ft/day
Porosity (lab value)	0.30
Fraction of Organic Carbon (lab value)	0.0001

Add the following inputs

Parameter	Value
Aquifer type	"homogeneous unconsolidated"
Distance	3,200 ft
Source Concentration	20 mg/L
Source Start Date	2/27/92
Source End Date	5/5/98

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