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GROUNDWATER DIRECTION AND FLOW RATE <br /> Shallow Aquifer <br /> Groundwater elevations at wells SB-1, MW-4, MW-5 and PZ-1 indicate that groundwater flow in <br /> the shallow water-bearing zone was bi-directional, to the northwest and to the southeast from well <br /> SB-1 (Figure 2). <br /> The average calculated groundwater velocity to the northwest between SB-1 and MW-5 is 0.71 ft/yr <br /> based on a gradient of 0.0026 foot per foot. The average calculated groundwater velocity to the <br /> southeast between SB-1 and MW-4 is 0.50 ft/yr based on a gradient of 0.0018 foot per foot <br /> (Appendix G). <br /> Deep Aquifer <br /> The groundwater elevations at MW-6 and MW-7 indicate that groundwater flow is northeasterly <br /> from MW-7 to MW-6 (Figure 3). The average calculated groundwater velocity is 0.59 ft/yr based on <br /> a gradient of 0.0021 foot per foot(Appendix G). <br /> STANDARD OBSERVATIONS <br /> Site inspections were performed regularlyduring the quarter. A summary of the site observations is <br /> enclosed(Appendix H). A signature on the form is the certification that all observations were <br /> performed and are accurate. <br /> RUN-OFF/RUN-ON FACILITIES <br /> The Corral Hollow Sanitary Landfill contains several facilities to control run-on and run-off. A <br /> perimeter road encircling the site helps to prevent run-on. A mid-slope berm around the unit directs <br /> run-off into the retention pond in the northwest corner of the site, and perimeter ditches at the base <br /> of the unit directs run-off into the retention pond in the south-east comer of the site. During the first <br /> quarter of 2004 there were no breeches in the run-off/run-on facilities. Monitoring will continue. <br /> HISTORICAL TIMES SERIES PLOTS <br /> As required,historical time series plots are included(Appendix F). Note that constituents that are <br /> not detected are plotted at a value of half their respective detection limits. Outliers were included in <br /> all plots as requested by RWQCB staff. <br /> Corral Hollow Landfill Department of Public Works/Solid Waste <br /> IsT Quarter 2004 Groundwater Monitoring 6 County of San Joaquin-April 15,2004 <br />