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• Beacon Station No 641 June 23, 1998 <br /> Stockton. California Groundwater it <br /> Results <br /> Water-level data collected on March 31, 1998 was used to construct the Groundwater <br /> Contour Map (Figure 2) The average depth-to-water for the monitoring wells was <br /> approximately 49 feet Water levels have increased approximately 8 feet since wells MW-2 <br /> through MW-5 were measured on October 2, 1997 The flow direction on March 31, 1998 is <br /> shown to be toward the northwest at a magnitude of 0 0013 foot/foot, as opposed to the <br /> October 2, 1997 easterly gradient direction calculated at a magnitude of 0 0088 foot/foot <br /> Detectable concentrations of Benzene were measured in water samples collected from all <br /> monitoring wells at concentrations between 0 67 parts per billion (ppb) and 68 ppb, and <br /> 2,100 ppb in well MW-5 A Benzene Concentration Map was constructed for the March 31, <br /> 1998 data (Figure 3) Dissolved benzene concentrations have decreased in all of the wells <br /> since the previous 1997 sampling events <br /> Distribution <br /> A copy of this report should be forwarded to <br /> Mr Michael Infurria Jr <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br />�. 304 East Weber Avenue, Third Floor <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Mr Gordon Boggs <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> 641gmr98 q <br /> Job No 1641 41 2 HORIZON ENVIRONMENTAL INC. <br />