revised final closure plan - Salinas Valley Solid Waste Authority

Revised Final Closure Plan July 2010
Crazy Horse Sanitary Landfill -5- 103-97133
area requiring closure is approximately 66 acres. A schedule for CHLF closure activities based on
closure construction material quantities and deployment rates is discussed in Section 2.6.
The remaining landfill areas to be closed are identified below. The closure will take place in four
general phases. These phases in sequence are:
I. Southern slopes to the canyon floor.
II. Western topdeck and sideslopes
III. Eastern topdeck and sideslopes.
IV. Equipment parking and a recycling center area.
The first phase, the southern slopes, must be closed first to provide the necessary drainage
conveyance structures required to control stormwater discharge from improved surfaces in the other
phases as the site is closed. The second and third phases are depicted on Figure 4 as the west and east
sections of the currently active landfilling area. It is necessary to separate the topdeck area of the
CHLF into separate closure phases to maintain LFG control in the primary waste mass during closure
as discussed in Section 2.21. Active LFG control is a component of the groundwater Corrective
Action Program (CAP) so this function must be maintained during closure construction.
The fourth phase is the area currently used for recycling and maintenance activities, located to the
east of the active landfill and north of Module 1. This area was determined to be within the “Subtitle
D landfill footprint” as reported in 1993 and included within the limits of waste as shown on Figure 4.
Final Cover Extension. The SVSWA investigated the potential for waste outside the limits of the
Module 1 final cover system with a series of test pits in 2007. An extension to the Module 1 final
cover system is required due to the presence of waste discovered beyond the perimeter road (ref.
Figure 4). The extent of final cover begins near the flare station to past the visually obvious locations
of perimeter road subsidence, encompassing approximately 0.34 acres. This work will include
rebuilding the perimeter road to re-establish positive drainage to the catch basin at the end of the
perimeter road.
2.4 Monitoring and Control Systems
27 CCR 21790(b)(4) and 20180
The current monitoring and control systems at the Crazy Horse Sanitary Landfill consist of leachate
monitoring and control system (ref. Figures 6 and 7), a groundwater monitoring system (ref. Figures
8, 9, and 10), a groundwater extraction and treatment system, a stormwater discharge monitoring
system, and an LFG monitoring and control system (ref. Figure 11). The current monitoring and
control systems were described in the following sections of the JTD (Vol. 1):
• Section 5.6 - Leachate Monitoring and Control System
• Section 6.3.1 - Groundwater Monitoring System
• Section 3.5.8 - Groundwater Extraction System
• Section 6.3.3 - Stormwater Discharge Monitoring System
• Section 6.3.4 - Landfill Gas Management System
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