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Eastern San Joaquin Groundwater Basin Groundwater Management Plan <br />Northeastern San Joaquin County Section 5 <br />Groundwater Banking Authority 92 Groundwater Monitoring Program <br />5. Utilize proven and supported technologies in groundwater monitoring, database <br />management, and Geographic Information System (GIS). <br /> <br />Proven software and hardware technologies continue to redefine the field of environmental <br />monitoring. The following applications will power the GDC: <br /> <br />• ArcView 3.x/8.x <br />• ArcView Spatial Analyst <br />• ArcView 3-D Analyst <br />• ArcPad <br />• ArcIMS Application <br />• Dedicated Server <br />• ArcInfo <br />• MS Access <br />• MS SQL Server <br />• Pendragon Forms <br />• Personal Data Assistant (PDA) <br />• Global Positioning System (GPS) <br /> <br />The GDC is expected to be publicly available in 2005. <br /> <br />5.1.2 Status of Monitoring Network Enhancements <br />As part of the monitoring program evaluation, MWH recommended that the depth specific <br />monitoring well clusters be installed along the estimated saline front to capture better the <br />geologic factors and physical flow driving saline intrusion. The report envisioned five general <br />locations along Interstate 5 from North Stockton to the Lathrop and Manteca. Of the 5 <br />recommended well clusters, two have been installed by the DWR at the Swenson Golf Course <br />and the Sperry Road/McKinley Avenue stormwater detention basin in the City of Stockton. The <br />County and the DWR continue to coordinate monitoring and installation efforts. <br />5.1.3 USGS and DWR Partnership <br />The Authority and its member agencies are co-participants with the United States Geological <br />Survey (USGS) and DWR for the Groundwater Recharge and Distribution of High-Chloride <br />Groundwater from Wells Study (Study). The purpose of the Study is to quantify the source, <br />aerial extent, and vertical distribution of high-chloride groundwater and the sources, <br />distributions, and rates of recharge to aquifers along selected flow paths in Eastern San Joaquin <br />County. The information gained from the Study will answer many questions with respect to <br />future water levels, water quality, and storage potential under current and future management of <br />the Basin. <br />Historically, high-chloride groundwater along the San Joaquin River boundary of the Eastern <br />San Joaquin Sub-basin (Basin) has been defined by interpolating the 300 mg/L isochlor based <br />on limited groundwater quality data. Samples have measured in excess of 2,000 mg/L chloride. <br />Consequently, the aerial and vertical distribution of high-chloride groundwater is poorly defined <br />and the source of the high-chloride groundwater is unknown. Postulates on the origins of high- <br />chloride groundwater include the accretion of poor-quality water from the San Joaquin River, <br />incidental recharge of applied irrigation water and return flow, and upwelling of groundwater <br />from beneath the base of freshwater. Also, local efforts to augment the natural recharge rate