Laserfiche WebLink
Information obtained from the Department of Water Resources (DWR) concerning a San <br /> Joaquin Groundwater Investigation dated 1967 reveals little information with regard to aquifer <br /> formations under the subject site. There also has not been a groundwater contamination <br /> investigation in the proximity of the site that may reveal aquifer data. Additionally, the well <br /> log for the adjacent well referenced above does not indicate screened depths which may <br /> indicate aquifer formations. Since aquifer data is limited, groundwater monitoring from well <br /> sampling should be the means to assess any future potential adverse impacts from the project. <br /> A nitrate analysis of the well at 3730 Wilson Way revealed a relatively low NO3 concentration <br /> at 11 ppm. This well was also analyzed for chloride concentration and tested at 30 ppm. <br /> Chloride ions travel exceptionally well within the soil and aquifer environments. Since human <br /> wastes .are generally high in chloride content, increased chloride concentrations can be a first <br /> indicator of sewage contamination. However, it is important to note that the "Fall 1992 <br /> Groundwater Report" by the San Joaquin County Flood Control and Water Conservation <br /> District reveals chloride concentrations may be increasing in the area of the project due to <br /> drawdown. <br /> Surface Water <br /> Groundwater recharge areas may be natural or artificial and recharge water may come from <br /> various sources. Natural recharge occurs with direct percolation through the vadose or <br /> unsaturated zone to the groundwater, or infiltration through stream beds. According to the <br /> County Flood Control District maps, a natural recharge area may be located southeast of the <br /> Lproject site. There are also two adjacent sources of recharge that may influence underlying <br /> water table levels. The first source is the unlined Stockton Diverting Canal. Although this <br /> canal is operational primarily during the rainy season, it also carries irrigation tailwater which <br /> may be a source of nitrates. <br /> The second body of water is the retention pond in the southwest corner of the subject site. It <br /> is proposed that stormwater runoff from the Open Air Mail will be managed by the use of this <br /> retention pond with the stormwater eventually pumped into the diverting canal. It is <br /> anticipated this retention pond should not overly influence the water table if the pond is <br /> pumped down regularly into the Diverting Canal. <br /> 4� $ <br /> Vaffey Ag*search <br />