AMES 1523 S. Bell Ave., Suite 104 Ames, IA 50010 Phone: (515) 232 0950 DES MOINES 600 SW 7th Street, Suite M Des Moines, Iowa 50309 P: (515) 244 3184

BETTENDORF 870 40th Ave. Bettendorf, IA 52722 Phone: (563) 355 070 CEDAR FALLS 3105 Capital Way Suite 5 Cedar Falls, IA 50613 Phone: (319) 277 4016

CEDAR RAPIDS 2640 12th St., SW Cedar Rapids, IA 52404 Phone: (319) 366 8321 IOWA CITY 3003 Sierra Court SW Iowa City, IA 52240 Phone: (319) 688 3007

SIOUX CITY 2830 Highway 75 North Sioux City, IA 51105 Phone: (712) 233 549

Lyon County Sanitary Landfill Marshall, MN

Quick Stats: Serves Lyon County and six surrounding counties 45,000 tons MSW per year 50% residential; 50% industrial/manufacturing 41 acres closed; 16 acres open Manage leachate onsite with recirculation Active landfill gas collection and control system with flare

Proposed Landfill Expansion

Expansion Issues: Regulatory resistance to wetland mitigation Leachate collection flows north to south Pre-Subtitle D Landfill east portion of landfill footprint High groundwater table (within 4 feet) on eastern portion of

site Existing “Permit By Rule” Demolition Landfill south of Pre-

Subtitle D area Needed new disposal area within the next 2 years

Expansion Concepts Inward Gradient System (“Zone of Saturation”): Composite liner grades built below groundwater Acts as leak detection system Hydraulic trap for contaminants

Unlined Landfill Piggyback: Develop composite liner over Pre-Subtitle D area Excavate old PBR landfill to surcharge settlement

IGS Construction at Lyon County Landfill 2008 and 2014

Questions ?

Cami Van Abel, P. E. p: 651-225-5285

e: cavanabel@terracon.com