What Is the Depth of Garbage in That Landfill?

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What is the depth of garbage in that landfill? An investigation of the Cathcart Sanitary Landfill in Snohomish County, Washington EPA Greenhouse Gas Emission Calculations Modeled methane generation rate in reporting year. Quantity of waste placed in the landfill in year x. Snohomish County Closed Landfills Cathcart Landfill History Opened in 1980 One of the first landfills in the United States built under new standards regulating landfills: Flexible membrane liner Leachate collection system Active landfill gas extraction system for capturing methane 52 acre site Closed in 1992 3.5 million tons of refuse Cathcart Landfill Today Stage 6 – Looking to the Northeast Stage 5 – Looking to the East Cathcart Landfill – 2009 Cathcart Landfill – Liner System Cathcart Landfill – Stage 1 Completion Cathcart Landfill – August 18, 1989 What data is needed for analysis? Current topography (2006 Lidar) Closure topography (1992 survey) Facility Construction plans Landfill Stage boundaries Base elevation points for each stage of construction Cathcart Landfill – 1992 Closure Survey Cathcart Landfill – Stage 6 Grading Plan Cathcart Landfill – Stage 3/4 Construction Plan Cathcart Landfill – Stage 1/2 Construction Profile Control Points used to build liner model Cathcart Landfill Liner Surface 2006 Depth of Garbage (no liner or daily cover) Cathcart Landfill Average Profile ArcToolbox, Spatial Analyst, Map Algebra Depth of Garbage (as of 2006) Results ArcToolbox, Spatial Analyst Tools, Zonal, Zonal Statistics as Table EPA: e-GGRT Elevation Settlement between 1992 and 2006 ArcScene – Garbage Depth at Cathcart Landfill Questions? Contact Information: Jon Greninger, GISP Senior Planner Snohomish County Solid Waste Division Email: [email protected] Phone: 425.388.6484 .

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