Excel Spreadsheet of Piezometer Groundwater Data in the Nauset Marsh Area collected August, 2005

This Excel spreadsheet contains the groundwater sample analyses information. Within this spreadsheet are 15 columns of information defined as the following: Sample Location Site name - name assigned to the piezometer location attempting to reoccupy the Geoprobe locations by the same site name. Approx. Water Depth at Time of Sampling (cm) - the approximate water depth at time of sampling measured in centimeters. Depth Below Sediment Surface (cm) - depth below the sediment surface measured in centimeters. Temperature (degC) - temperature in degrees Celsius. Conductivity (mS/m) - conductivity in milli-Siemens per meter. Salinity (ppt) - salinity in parts per thousand. Dissolved Oxygen (% saturation) - dissolved oxygen as percent saturation; how much oxygen is dissolved in the water as a percentage of how much it could hold at that temperature. Dissolved Oxygen (mg/L) - dissolved oxygen measure in milligrams per liter. pH - the measured acidity or alkalinity on the pH scale. Oxidation-Reduction Potential (mV) - oxidation-reduction potential in milli-volts indicating the relative strength of oxidizing compounds in the solution (more positive values) or reducing compounds in the solution (more negative values). N-NH3 - concentration of nitrogen in the reduced form of ammonium measure in micrograms per liter. N-NO3/NO2 - concentration of nitrogen in the oxidized forms of nitrate and nitrite combined measure in micrograms per liter. P-PO4 - concentration of phosphorus in the form of phosphate measured in micrograms per liter. Total Dissolved P (TDP) as PO4 - total dissolved phosphorus; dissolved inorganic and organic phosphorus all chemically converted to inorganic form and measured as phosphorus in micrograms per liter. Total Dissolved N (TDN) as NO3) - total dissolved nitrogen; dissolved inorganic and organic nitrogen all chemically converted to inorganic form and measured as nitrogen in micrograms per liter. In terms of data collection, a hydraulic vibratory drilling rig mounted on an all-terrain vehicle and secured to a barge was used to advance piezometers for submarine ground-water sampling. These piezometers consisted of 2.5 cm diameter steel pipe in 3.4 m lengths that were joined by hydraulically crimped couplings. Water samples were taken generally every 305 cm with water quality measurements of temperature, conductivity, dissolved oxygen, pH and oxidation-reduction potential made using a YSI 650 Multi-Parameter data sonde. In addition, filtered samples were collected for nutrient measurements.