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Dem 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 1.53 ft/yr based <br /> on a gradient of 0.0055 foot per foot. The water levels in the deep aquifer do not show a rise, <br /> demonstrating that recharge from the rising levels in the shallow aquifer are not factor in the deep <br /> aquifer. This indicates that impacts present in the shallow aquifer are hydraulically isolated from <br /> the deep aquifer <br /> STANDARD OBSERVATIONS <br /> Site inspections were performed regularly during the quarter. A monthly summary of site <br /> observations is enclosed (Appendix H). An electronic signature on the form certifies that the <br /> observations were performed and are accurate. <br /> RUN-OFF/RUN-ON FACILITIES <br /> The CHSL utilizes several facilities to control run-on and run-off. A road at thep erimeter of the <br /> site assists in preventing run-on. A mid-slope berm around the unit directs run-off into the <br /> retention pond in the northwest corner of the site, and perimeter ditches at the base of the unit <br /> direct run-off into the retention pond in the south-east corner of the site. During the second <br /> quarter there were no breeches in the run-off/run-on facilities. Monitoring will continue in <br /> accordance with the Stormwater Pollution Prevention Plan. <br /> Corral Hollow Landfill 10 Department of Public Works/Solid Waste <br /> 2nd quarter 2007 Groundwater Monitoring County of San Joaquin—July 31,2007 <br />