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LJ <br />Based on the information given, the capillary rise at the site could be as high as 1 meter. Since <br />the bottom of waste at the landfill is approximately 230 to 250 msl, the capillary fringe is not <br />expected to affect the waste. <br />5.4.2.4. Springs <br />A review of United States Geological Survey (USGS) topographic maps indicate that no springs <br />are located within 1 -mile of site (KA, 1985). There does appear to be a seasonal spring at the <br />east side of the site which flows into a stormwater pond during the winter. <br />5.4.3. Groundwater Quality <br />5.4.3.1. Regional Groundwater Quality <br />The landfill site is located within the San Joaquin Hydrologic Region, Eastern San Joaquin <br />Subbasin. The subbasin encompasses 707,000 acres (The California Department of Water <br />Resources, 2003). According to California's Bulletin 118 for the San Joaquin River Hydrologic <br />Region, 2003, groundwater measurements over the past 40 years have shown a continuous <br />decline in groundwater levels in the Eastern San Joaquin County. As a result of declining water <br />levels, poor quality water has been moving eastward along a 16 -mile front on the east side of the <br />Delta. The degradation was particularly evident in Stockton where a saline front is moving <br />eastward. Large areas of elevated nitrate in groundwater exist within the subbasin located <br />southeast of Lodi and south of Stockton. For the entire basin, 689 public supply water wells <br />were sampled from 1994 through 2000. Samples analyzed indicated that 523 wells (76%) met <br />the state primary MCLs for drinking water. The others (24%) had constituents that exceeded one <br />or more MCLs. These included: inorganics (aluminum, arsenic, manganese, iron, and total <br />dissolved solids), radiological particles, nitrates, pesticides, and VOCs. Calcium -magnesium <br />bicarbonate or calcium -sodium bicarbonate types characterize the majority of the basin. <br />Bicarbonate is the predominant anion in the eastern part of the basin. <br />Groundwater quality throughout the region is suitable for most urban and agricultural uses (The <br />California Department of Water Resources, 1994). <br />Foothill Sanitary Landfill <br />JTD <br />Page 27 of 62 Public Works/Solid Waste <br />County of San Joaquin — Revised 10/6/05 <br />