Monitoring Saltwater Intrusion with Robowell at Provincetown Massachusetts: 

Color-coded graphic showing the relative locations of the screened intervals of the shallow (TSW-260) and deep (TSW-259) monitoring wells, the intake of the water-supply well (KC-02), and the approximate depth to ground water at the monitoring site. 

The depth to ground water is measured from the lip of the protective casing (about 3 feet above land surface).

The specific conductance is a measure of the total dissolved solids in solution.  To put these real-time measurements into perspective, the conductance of deionized water is about 1 microsiemen per centimeter (uS/cm), precipitation on Cape Cod Ranges from about 2 to 195 uS/cm, potable water ranges from about 50 to 1,500 uS/cm, seawater is about 50,000 uS/cm and brines can have a conductance higher than 200,000 uS/cm (Granato and Smith, 1999).

The pH is a measure of the hydrogen-ion activity or acidity of a solution. To put the real-time values in perspective "pure" water has a pH of about 7, precipitation on the Cape Cod ranges from about 3.6 to about 5.4, potable waters range from about 6.5 to about 8, and shallow seawaters are about 7.5 to about 8 standard units. 

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