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• Settlement <br /> Any noticeable settlement on the top deck that would cause <br /> ponding will be inspected. RWQCB does not require a five-year <br /> iso-settlement map at HLSL. Past experience by SWD staff <br /> indicates that low areas due to settlement with potential ponding <br /> cannot be detected by aerial topographic mapping; thus, visual <br /> inspection is the best detection method of settlement. <br /> HLSL has two permanent survey monuments from which the <br /> location and elevation of wastes and monitoring facilities can be <br /> determined throughout the post closure maintenance period per <br /> Title 27 Section 20950(d) (Figure 2). <br /> • Closure Cap Vegetation <br /> Growth of vegetation on the closure cap will be monitored <br /> regularly. Currently San Joaquin County Environmental Health <br /> Department (EHD) has asked SWD to maintain vegetation on the <br /> closer cap below ten inches for easier cover inspection. <br /> 5.2.A.2 Maintenance <br /> Regular maintenance of the final cover includes: <br /> • Fill ponding and low spot areas noticed during inspection with <br /> soil from the borrow area. <br /> • Repair erosion on the closure cap <br /> • Maintain vegetation on the vegetated erosion resistant layer <br /> per the Vegetation Maintenance Plan. <br /> • Fill holes created by rodents <br /> • Fill visible cracks in the vegetative layer. <br /> 5.2.B Drainage <br /> 5.2.B.1 Monitoring Method and Procedure <br /> SWD will visually inspect HLSL's drainage facilities as required by <br /> the WDR. More frequent site visits will be made during <br /> precipitation months. Following are the items that will be <br /> inspected. <br /> • Settlement in drainage ditch inverts that would cause ponding. <br /> Postclosure Maintenance n San Joaquin County <br /> a ce PI a <br /> Harney Lane Sanitary Landfill 7 Department of Public Works <br /> Revised July 30,2009 Solid Waste Division <br />