Evaluation of ground-water monitoring network, Santa Cruz County, California

Open-File Report 81-139
By:  and 



The Santa Cruz County Flood Control and Water Conservation District seeks to improve the existing network of observation wells to monitor water levels and ground-water quality in the Pajaro Valley subarea and the Aptos-Soquel, San Lorenzo, and Santa Cruz Coastal subbasins in California. The proposed network , consisting of 92 wells, is designed to monitor changes in storage and quality of ground water resulting from climatic changes and management-induced stresses. In the proposed network , water levels in all wells would be measured semiannually, in April and September, and monthly in a few key wells. The water-level measurements would provide data that could be used to determine changes in ground-water storage. In addition to the currently monitored characteristics--temperature, specific conductance, pH, and chloride ion concentration--inclusion of annual sampling and analysis for major ions and nutrients is proposed. The network would also include sampling and analysis for trace elements once every 4 years. More frequent analyses are proposed in areas where water-quality problems are known to exist or where potential water-quality problems are recognized. Analyses for major ions, nutrients, and trace elements are included in the proposed network to provide baseline data for monitoring long-term changes in water quality and to detect any unexpected changes in quality. (USGS)
Publication type Report
Publication Subtype USGS Numbered Series
Title Evaluation of ground-water monitoring network, Santa Cruz County, California
Series title Open-File Report
Series number 81-139
DOI 10.3133/ofr81139
Edition -
Year Published 1981
Language ENGLISH
Publisher U.S. Geological Survey,
Description iv, 24 p., 2 over-size sheets ;28 cm.
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