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Eastern San Joaquin Groundwater Basin Groundwater Management Plan <br /> 5. Utilize proven and supported technologies in groundwater monitoring, database <br /> management, and Geographic Information System (GIS) <br /> Proven software and hardware technologies continue to redefine the field of environmental <br /> monitoring. The following applications will power the GDC: <br /> • ArcView 3.x/8.x <br /> • ArcView Spatial Analyst <br /> • ArcView 3-D Analyst <br /> • ArcPad <br /> • ArcIMS Application <br /> • Dedicated Server <br /> • Arclnfo <br /> • MS Access <br /> • MS SQL Server <br /> • Pendragon Forms <br /> • Personal Data Assistant (PDA) <br /> • Global Positioning System (GPS) <br /> The GDC is expected to be publicly available in 2005. <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 <br /> Northeastern San Joaquin County Section 5 <br /> Groundwater Banking Authority 92 Groundwater Monitoring Program <br />