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1.2.2.2 Groundwater Use <br /> The site is located within the San Joaquin groundwater basin. Beneficial uses of groundwater in the area include <br /> q g <br /> municipal, domestic, irrigation, stock watering, process, and service supply(SECOR, 2005a). <br /> A summary of water wells identified within a one-mile radius of the site is provided as Table 1 and their <br /> approximate locations are depicted on Figure 9. The known screen intervals reported for 13 wells indicate the <br /> wells are set within the B zone of the Upper Tulare Aquifer(i.e., greater than 50 feet bgs). None of the 16 wells <br /> are located downgradient of the site, given the predominantly north-northeastern groundwater flow direction. <br /> Based on a Department of Water Resources file review, no San Joaquin County (County) or City operated <br /> municipal water supply wells (which are typically screened in the Lower Tulare Aquifer) were located within <br /> the general area of the site. <br /> Groundwater within the Upper A, A, and B zones of the Upper Tulare Aquifer in this area is not typically used <br /> for human consumption due to naturally poor water quality (e.g. high boron concentrations and salinity) <br /> (ATSDR, 1998). Groundwater quality of the shallow aquifers in the San Joaquin Valley has been impacted by <br /> sprayed irrigation water in the agricultural areas. Salinity in the shallow groundwater has increased due to <br /> evaporation of sprayed irrigation water and evapotranspiration of soil moisture leaves dissolved salts in the <br /> system. Selenium and boron are also leached out of the soils by irrigation water, raising concentrations in the <br /> shallow groundwater(USGS, 1995) <br /> 1.2.2.3 Extraction Wells Affect on Groundwater Flow <br /> One onsite groundwater extraction well (EW-1), one onsite water supply well (WSW-1), and sixteen offsite <br /> groundwater extraction wells were identified within a one-mile radius of the site, as summarized on Table 1, and <br /> 1 illustrated on Figure 9. Based on historical groundwater monitoring data, pumping from these wells does not <br /> appear to impact onsite groundwater flow. No groundwater injection wells were identified in the vicinity of the <br /> site (EDR, 2002a and EDR,2002b). <br /> 1.2.2.4 Surface Water <br /> The site is located approximately 2-1/2 miles west of the San Joaquin River, within the San Joaquin River Basin. <br /> The CRWQCB-CVR defines the San Joaquin River basin as the area drained by the San Joaquin River, <br /> including all watershed tributaries to the San Joaquin River, and the Delta, south of the Sacramento River, and <br /> south of the American River Watershed. Tom Paine Slough and the Paradise Cut are located approximately one <br /> mile northeast of the site (USGS, 1998). Historical groundwater gradient data suggest that Tom Paine Slough <br /> and the Paradise Cut are gaining surface water bodies. <br /> Three unlined retention ponds are located onsite near the northern site boundary. These ponds are used for <br /> temporary storage of surface water run-off prior to surface discharge. These unlined ponds may also recharge <br /> shallow groundwater in the area(SECOR, 2004a). <br /> BLASLAND,BOUCK &LEE,INC. <br /> 3124106 engineers,scientists,economists 1-3 <br /> J:\D0006\44634_00161022_Conceptual Site Model.doc <br />