revised final closure plan - Salinas Valley Solid Waste Authority

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Revised Final Closure Plan July 2010 Crazy Horse Sanitary Landfill -23- 103-97133 2.16 Leachate Management System 27 CCR 21790(b)(8)(F), 21160(d), and 20340 The leachate control system for the closed CHLF is shown on Figures 6 and 7. Currently leachate gravity drains from the 15-ac leachate collection and removal system (LCRS) under the west side of the landfill. These flows are captured by a 5,000-gallon collection tank near Sedimentation Basin A. The collected leachate is pumped from the lower collection tank to the upper storage tanks located near the landfill gas flares and maintenance building in the entrance facilities (ref. Figure 7). Leachate flows for the past few water years since recording began are shown below: CHLF Leachate Generation Water Year Gallons 2002/2003 253,426 2003/2004 512,219 2004/2005 680,005 2005/2006 729,355 2006/2007 646,645 2007/2008 679,590 2008/2009 750,300 These annual flows are divided into monthly flows: Golder Associates
Revised Final Closure Plan July 2010 Crazy Horse Sanitary Landfill -24- 103-97133 Monthly Leachate Flows (ga) Month Average Max Min January 75,739 139,643 37,289 February 62,228 100,792 32,177 March 80,946 111,996 32,897 April 58,499 93,368 30,065 May 59,435 130,795 27,570 June 54,048 112,574 32,087 July 41,868 59,914 25,788 August 44,390 59,977 29,973 September 36,755 47,100 24,843 October 33,196 52,920 4,015 November 42,105 68,201 22,460 December 44,372 65,967 31,679 Totals 633,581 1,043,247 330,843 The leachate storage tanks in the entrance facility provide a total storage capacity of 40,000 gallons as shown on Figure 7. The tanks located near the flare station (L1 and L2 on Figure 7) are referred to as the Upper Leachate Storage Tanks in SVSWA reports regarding leachate generation and disposal. These tanks provide 10,000 gallons of storage each. Overflow piping in tanks L1 and L2 gravity flow to the backup leachate storage tanks L3 and L4 (Ref. Figure 7) located west of the maintenance building. The backup tanks provide an additional combined storage of 20,000 gallons. These tanks are typically used during the wintertime during higher leachate flow rates. Leachate was used as dust control in the operating areas of the landfill. That practice will no longer be available after site <strong>closure</strong> so offsite disposal of leachate will initially be required during winter months at a local wastewater treatment works. Alternatively, leachate treatment and recirculation will be added to address the leachate volume as discussed below. Leachate Volume Reduction Treatment – Beginning in 2009, the SVSWA started an experimental leachate volume reduction treatment project. The project consists of two main processes: oxidation to control odors, and evaporation by controlled forced air. The results of the experimental project are included in Appendix D. With satisfactory results, the SVSWA is proceeding with expanding the leachate volume reduction treatment project to serve about 30 to 50 percent of the site’s leachate volume. The proposed leachate volume reduction treatment unit will be located adjacent to the storage tanks near the flare system. The unit will process a maximum of 30,000 gallons per month and it is expected to reduce the leachate volume by 90 percent. The unit contains a holding tank for storage and overflow. The operation and monitoring of the unit will be conducted by Cal-Recovery, a waste management consulting firm. The unit will comply with all necessary regulatory requirements before proceeding assembly, testing and operations. Golder Associates
Page 1 and 2: REVISED FINAL CLOSURE PLAN (2010) C
Page 3 and 4: Revised Final Closure Plan July 201
Page 29: Revised Final Closure Plan July 201
Page 41 and 42: TABLES Table 1 - CalRecycles Final
Page 43 and 44: Initial Closure Final Cover Phase I
Page 45 and 46: This figure was originally produced
Page 47 and 48: CRAZY HORSE CANYON ROAD CRAZY HORSE
Page 49 and 50: A - 1 - - TYPICAL ARRAY SECTION LEG
Page 51 and 52: ID Task Name Duration Start Finish
Page 53 and 54: LEGEND NOTES REVISED FINAL CLOSURE
Page 55 and 56: LEGEND A-55 SW-1 NOTES REVISED FINA
Page 57 and 58: LEGEND E A-15 NOTES REVISED FINAL C
Page 59 and 60: NE SW A 4 12 LANDFILL CROSS SECTION
Page 61 and 62: LEGEND NOTES J 14 14 OVERSIDE DRAIN
Page 63 and 64: 1 16 16 2B 16 16 2A 16 16 U 4 16 MA
Page 65: V 18 18 NOTES V 18 18 MODULE 1 FINA

revised final closure plan - Salinas Valley Solid Waste Authority

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