Dissolved groundwater geochemistry time-series with methane over Marcellus Shale in NY

Eleven domestic water wells over the Marcellus Shale in New York were sampled monthly for 13 months. They were analyzed for dissolved hydrocarbons (methane, ethane, propane) and major ion concentrations (Ca, Mg, K, Na, NH4, SO4, Cl, F, Br, NO3). Biannual (Jun & Dec 2017) methane and water isotope measurements are included for wells with sufficient concentrations. The likely sources of salinity and probabilities for each well for each month are also listed.