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Quarterly Status Repot <br /> Beacon Station 492 - Manteca, California <br /> Page 2 <br /> SUMMARY OF THIS QUARTER'S ACTIVITIES: <br /> Quarterly ground-water monitoring was performed at the site on <br /> October 1, 1991. Depth-to-water measurements and ground-water <br /> samples were collected from the three ground-water monitoring <br /> wells at the site. <br /> RESULT OF QUARTERLY MONITORING: <br /> Depth-to-water measurements show the elevation of the water <br /> surface in the three ground-water monitoring wells to be <br /> within 1.48-feet -of each other <br /> Ground-water analyses show all three wells to have <br /> nondetectable TPHg and .BTEX concentrations, except MW-2 which <br /> has a total xylene concentration of 1.6 ppb. BTEX detection <br /> limits were 0.5 ppb and the 'TPHg detection limit was 50.0 ppb. <br /> PROPOSED ACTIVITY OR WORK FOR NEXT QUARTER: <br /> ACTIVITY ESTIMATED COMPLETION DATE <br /> Perform fourth quarter 1991 ground-water <br /> monitoring. December, 1991 <br /> Prepare Workplan for installing <br /> an additional monitoring well in <br /> the downgradient direction of the <br /> Beacon hydrocarbon source once the <br /> I "2 site" gradient is evaluated 4th Quarter 1991 <br /> Acquire air permit to reinstate vapor <br /> f extraction at the site Late First Quarter 1992 <br /> F <br /> 4: <br />