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Beacon Station No 641 January 27, 1999 <br /> Stockton, California _ Groundwater Monitoring Rel2ort <br /> Conclusions <br /> Water-level data collected on December 30, 1998 was used to construct the Groundwater <br /> Contour Map (Figure 2) The average depth-to-water for the five groundwater monitoring <br /> wells was approximately 44 0 feet Water levels have increased approximately 5 5 feet since <br /> September 1998 The flow direction is shown to be toward the northeast at an average <br /> magnitude of 0 001 foot/foot, with a slight mounding near well MW-1 <br /> Detectable concentrations of benzene were measured in water samples collected from wells <br /> MW-1, MW-2 and MW-5 at concentrations of 0 96 parts per billion (ppb), 5 4 ppb and 32 <br /> ppb, respectively A Benzene Concentration Map was constructed for the December 30, <br /> 1998 data (Figure 3) Dissolved benzene concentrations have decreased in all five <br /> groundwater monitoring wells since the September 1998 sampling event <br /> Recommendations <br /> Horizon recommends continued quarterly monitoring Horizon is currently formulating a <br /> Work Pian for additional site assessment <br /> Distribution <br /> A copy of this report should be forwarded to <br /> Mr Michael Infurna 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 />�1 <br /> 641gmr98 q4 <br /> Job No 1641 41 2 HORIZON ENVIRONMENTAL INC <br />