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Foothill Sanitary Landfill 22 Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring ©2025 County of San Joaquin. All rights reserved. <br /> <br />11.0 5-YEAR TOPOGRAPHIC SURVEY <br />Per the Monitoring and Reporting section of the WDRs, (MRP A.6.c, Five-Year Topographic <br />Survey), the five-year iso-settlement survey for LF-1 and LF-2 was provided in Figure 6 of the <br />Second Semiannual 2022 report. The figure showed some surface subsidence in the central <br />portion of the LF-1 area and into LF-2. The topographic comparison showed that waste was <br />being placed in LF-2 with an associated increase in surface elevation. The next five-year iso- <br />settlement survey will be completed in 2027.