This is legacy code from the CUAHSI HIS project
There are two Visual Studio projects presently of interest. They were running on river.sdsc.edu until it's demise in early 2016.
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EPA: legacy_webservices\BaseWofService\EPAWebService
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NWIS: legacy_webservices\BaseWofService\NwisDailyValuesWebService ** Noted that the Groundwater Service is the one of interest, at present, but all services packaged in the same webapp. ** since CUAHSI handles the catalog, it might be best to just extract code used by the GW values service.