The following guidelines will be followed to delineate a SWAP area.
Community System - If the system serves more than 500 population
the area is delineated by one of the Wellhead Protection Program (WHPP)
methods.
Bedrock Systems - Hydrogeologic Mapping
Karst Areas - Hydrogeologic Mapping
Mine Areas - Hydrogeologic Mapping
Alluvial Systems - Numerical or Analytical Mapping
If the systems serves less than 500 population the area has a interim
fixed radius of 1500'.
Non-Transient - If the system serves more than 500 population
the area is delineated by one of the WHPP methods.
If the systems serves less than 500 population the area has a interim
fixed radius of 1000'.
Transient - If the system serves more than 500 population
the area is delineated by one of the WHPP methods.
If the systems serves less than 500 population the area has a interim
fixed radius of 500'.
Please note that in a Karst area interim fixed radius will be 2000'
for less than 500 populations served.
Reuben asked the committee members to take this information back
to their agency to get additional input. This is an area for feedback.
If these methods are too restrictive or not protective enough, then
this needs to be brought up beforehand.
The decision of whether to use a interim fixed radius method or
a more sophisticated method to delineation these smaller systems will
be made if it is determined necessary once additional reservoir data
and the initial inventory data is acquired.
Calculating the entire area that the water can come from in a particular
source is part of the delineation.
We are in the process of looking at computer models depending on
the time frame. Some questions that need to be answered:
- Is there data available to run this program?
- This system has to very well planned because people may question
your assumption.
- The technical committee should be responsible for making system
work. They can delineate the areas. We do the delineation in house
using the analytical modeling.
One of the Citizen Advisory Members asked if the technical committee
is only there to provide verification of a system only? Bill Toomey,
WVBPH said that none of the Wellhead plans have been questioned. The
Technical Committee is used to help create a scientifically designed,
well-thought out program that will deal with most of the issues beforehand.
The Wellhead Protection Program uses the Analytical Modeling.
The fixed radius method is fast, easy, and inexpensive.
Discussed the geologic settings for public water systems of West
Virginia.
- discussion of the 6 Hydrologic Regimes in WV
- limestone areas will pick up the Karst
Discussed the terminology for Basic Capture Zone Analysis.
Explained the EPA 5 year Time of Travel (TOT). Pumping a well in
an alluvial setting we look at the 5 year TOT to delineation the area.
Many of the other states use the 5 year TOT for groundwater systems.
That is the minimum time set by the EPA.
Reviewed the Paden City WHPP Groundwater Model