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4-3 ® controls can be provided from which to monitor future landfill settlement. After completion of the final cover, a settlement monument will be set on the landfill on the bench as shown on Figure 8. The monument will be used to monitor settlement within the Stage 113 partial closure area and will allow for a determination of the actual settlement that occurs over the post-closure maintenance period. Additionally, 27 CCR, Section 21090(e)(2) requires operators to produce iso-settlement maps every five years throughout the post-closure maintenance period or until settlement has ceased. Prior to an aerial survey, the monument will be surveyed for horizontal and vertical control so that an accurate disposal area topographic map can be developed. Aerial "targets" will be placed over the monument after the survey has been completed and an aerial topographic map will be generated to provide an up-to-date contour map of the Stage 1B Partial Final Closure area. The settlement and lateral movement of the monument will then be recorded. Prior to a scheduled survey of the monument, an inspection will be performed to ensure that the monument is intact and usable. The monument will be cleared of all debris and vegetation to allow for visual location of the monument and accurate readings. Should the monument be damaged or missing, a new monument will be placed at that location so that the continuity of the previous survey data will be maintained. If the monument is within an area requiring regrading and/or other reconstruction, it shall be replaced at approximately the same horizontal location and a note shall be placed to ® identify the new elevation. Forward Landfill Stage 113 Partial Final Closure/Post-Closure Maintenance Plan June 2011 SWT Engineering z:\projects\allied waste\forward\11-1014 partial fnl clsr pin\partial final closure plan document\text\sec 4.doc