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NWTR The Rio Vista Gas Field is a large natural gas field in the Sacramento--San Joaquin River Delta in northern California, adjacent to Rio Vista, California. Discovered in 1936, and in continuous operation since, it has produced over 3.6 trillion cubic feet (100 km3) of gas in its lifetime, and retains an estimated reserve of approximately 7 trillion cubic feet by the USGS. Spanning portions of three counties, it is the largest natural gas field in California and one of the fifteen largest in the United States. New Western plans to complete existing and multiple virgin producing zones in an initial 11 well project that can be expanded throughout the field. Current non-treated wells are producing approximately 400mcf/day, which is expected to increase after completion and treatment. Current marketing contracts are with PG&E.