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Manteca Quarte Groundwater MonitorLng Pae 6 <br /> SRK was denied permission to install an off-site groundwater monitoring well in the Southern <br /> Pacific Railroad right-o£-way south of the tracks Because of this, soil/groundwater conditions in <br /> this area have not been investigated <br /> The static water levels in each of the three monitoring wells rose significantly since November <br /> 1991 likely due to seasonal water table fluctuation The exact amount of precipitation or <br /> infiltration is unknown, however, the elevated levels of volatile hydrocarbons, benzene and <br /> xylenes, may be the result of seasonal fluctuations in the static water table and the associated <br /> flushing action <br /> The groundwater gradient trends N17°E, with a true dip of 2°NE. Available static water level <br /> information indicates that the localized groundwater gradient is significantly flat,which may reflect <br /> extensive agricultural groundwater usage both upgradient and downgradfent from the site <br /> 1 <br /> 1 <br /> ' 32W4 22\Ptr A.22 Steffen Robertson and Krsten <br />