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The entrance has been secured allowing access to authorized <br /> personnel only. A fence will remain around the entire perimeter of <br /> the site. <br /> 8.0 FINAL COVER <br /> Final cover at the Harney Lane Sanitary Landfill will be applied to <br /> approximately 100 acres, which is the area that is filled with <br /> refuse. Final cover will consist of a two foot foundation layer <br /> followed by a one foot clay layer and a one foot vegetative layer. <br /> Soils from the borrow areas just south of the primary site (see <br /> sheet 4) will be used for the foundation and vegetative layers. <br /> The clay layer will consist of borrow area soils mixed with <br /> imported Ione clay to meet the required specifications. <br /> A complete construction quality assurance program is provided <br /> (Appendix C) to ensure that the final cover material will be <br /> tested, constructed, and maintained to comply with the Closure and <br /> Postclosure Regulations Title 14, Chapter 3, Article 7.8, section <br /> 17774. <br /> By the time closure operations begin, much of the area will already <br /> be covered with intermediate cover. Therefore, only about one foot <br /> of additional soil will be needed to complete the foundation layer. <br /> Approximately 484 , 000 cubic yards of soil is needed to cover 100 <br /> acres with three feet of final cover. Assuming a 10 minute round <br /> trip time from the borrow area to the placement area, it would take <br /> one 23 c.y. scraper approximately 3 , 507 hours to apply final cover. <br /> However, more scrapers will be used to cut down the time required <br /> to apply the cover. The estimated schedule for closure operations <br /> is shown on figure 2 . <br /> 9.0 FINAL GRADING <br /> The final landfill cover will be constructed to a minimum of three <br /> percent grades. These slopes are designed to provide proper <br /> drainage, prevent high velocity overland flow, and prevent slope <br /> reversal due to landfill settlement. <br /> The maximum slopes are graded at a ratio of 1.75 feet horizontally <br /> for every 1 foot of vertical lift (1. 75: 1) (see sheets 1 & 2) . <br /> Settlement will be monitored by taking the following steps: <br /> 1. Maintaining two permanent monuments. <br /> 2 . Every five years, commencing upon completion of <br /> closure activities: <br /> 8 <br />