Item talk:Q58629

From geokb

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     "name": "Preliminary results from exploratory sampling of wells for the California oil, gas, and groundwater program, 2014\u201315",
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     "abstract": "Introduction\nIn 2014 and 2015, the U.S.\u00a0Geological Survey (USGS) sampled\u00a0water wells in the Los Angeles Basin and\u00a0southern San Joaquin Valley, California,\u00a0and oil wells in the San Joaquin Valley\u00a0for analysis of multiple chemical,\u00a0isotopic, and groundwater-age tracers. The purpose of this reconnaissance\u00a0sampling was to evaluate the\u00a0utility of tracers for assessing the effects\u00a0of oil and gas production activities on\u00a0groundwater quality in California. The study was done in cooperation with the\u00a0California State Water Resources Control\u00a0Board.\u00a0Results of the study are intended\u00a0to help design a regional groundwater-monitoring\u00a0program to be implemented\u00a0as part of California Senate Bill 4 (SB 4\u00a0statutes of 2013). The regional monitoring\u00a0program plans to assess the effects\u00a0of oil and gas production activities on\u00a0groundwater quality and to provide a\u00a0regional context for local monitoring\u00a0of the groundwater-quality effects from\u00a0well-stimulation treatments, which are\u00a0techniques used to improve oil and gas\u00a0production by increasing their rate of\u00a0flow to the well. California SB 4 mandates\u00a0that this local monitoring is to be\u00a0done by oil-well operators in accordance\u00a0with monitoring criteria established by\u00a0the State Water Board.\nThis report evaluates the utility\u00a0of the chemical, isotopic, and groundwater-age tracers for assessing sources\u00a0of salinity, methane, and petroleum\u00a0hydrocarbons in groundwater overlying\u00a0or near several California oil fields.\u00a0Tracers of dissolved organic carbon inoil-field-formation water are also discussed.\u00a0Tracer data for samples collected\u00a0from 51 water wells and 4 oil wells are\u00a0examined.",
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