California GAMA Special Study: Interpretation of Isotopic Data in the Sonoma Valley, California

Technical Report · Wed Apr 14 04:00:00 EDT 2010

DOI:https://doi.org/10.2172/1130005· OSTI ID:1130005

Moran, Jean E. ^[1]; Carle, Steven F. ^[2]; Esser, Bradley K. ^[2]

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1. California State Univ., East Bay, Hayward, CA (United States)
2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

A shallow aquifer system near the city of El Verano in Sonoma Valley, California, supplies urban and rural water users. The source of recharge to this aquifer and its connection to Sonoma Creek are not well known, making its susceptibility and sustainability under different scenarios of land and water use difficult to assess. Under the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) program, Lawrence Livermore National Laboratory carries out groundwater studies that focus on specific constituents of concern, or specific geographic areas where recharge and transport are not well determined. In this study, ten wells were sampled for tritium, helium isotopic composition, dissolved gas concentrations, concentrations of major anions and nitrate, and stable isotopes of water and of nitrate in order to examine sources of recharge, groundwater residence time, and water quality in the El Verano area.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48; AC52-07NA27344
• OSTI ID: 1130005
• Report Number(s): LLNL--TR-427958
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES