Landfill Odor Action Plan Utilities Department October 6,

Presentation Overview  Background  Operational Changes  Community Outreach 2

Presentation Overview  Background  Operational Changes  Community Outreach 3

Background Landfill Mission: Provide environmentally safe and economically efficient disposal  Operating since 1971  Located on 5,000 acres  Remaining life-50 to 75 years 4

Background  Generated during waste decomposition  Approximately 50% methane, an odorless gas, with the remainder being mostly carbon dioxide  Gas is sent to the Orlando Utilities Commission Stanton Energy Center to generate power for up to 15,000 homes Landfill Gas 5

Background  Trace amounts of other gases, including hydrogen sulfide (H 2 S), make up the remainder - H 2 S has a “rotten egg” smell - H 2 S detectable at 4 parts per billion (ppb) - H 2 S OSHA health standards below 20,000 ppb - H 2 S recorded beyond the landfill was 48 ppb, maximum - H 2 S at these low levels is not toxic or hazardous Landfill Gas 6

Background Class III Cell 2 Class III Cell 1 Closed Cell AK Closed Cell 7B Closed Cell 8 Active Cell 9 Cell 10 Future Cell 11 Future Cell 12 Compost Yard

Background Locations of Odor Complaints in 2015

Background Odor Contributors  Active landfill is growing  Landfill elevation is above the tree line  High rainfall increases odor generation  Prevailing winds north and northwest during rainy season  Starting April 2013, Construction and Demolition (C&D) waste was disposed of with the Municipal Solid Waste (MSW, or household waste)  Construction and Demolition (C&D) mixed with MSW has been found to produce higher concentrations of H 2 S than MSW or C&D alone 9

Presentation Overview  Background  Operational Changes  Community Outreach 10

Actions Taken To Date  Expanded landfill gas collection system  Installed misters designed to reduce objectionable odors  Initiated closure of a portion of the landfill  Hired a consultant to evaluate and develop solutions  Established a monitoring program to measure H 2 S in areas around the landfill  Began separating C&D waste from the MSW Operational Changes 11

Actions Taken To Date  Consultant Information  SCS Engineers (SCS) Conducted numerous landfill related odor studies throughout the U.S. recommending comprehensive lists of mitigation methods to reduce odor problems  HSA Golden (HSA) has worked on odor issues at the Golden Gem Road Class III landfill in Apopka and the West Orange Environmental Construction and Demolition facility resulting in reduced odors  Grove Scientific & Engineering Company (GSE) Wrote the Florida Department of Environmental Protection approved odor impact study for the Osceola Class III landfill, performed community monitoring and provided a successful odor control action plan for the Pine Ridge landfill Operational Changes 12

Operational Changes  Increase soil cover on landfill  Stop using tarps for daily cover  Continue to log odor issues  Expand misting system  Apply odor control enzymes at the landfill  Separate Construction and Demolition waste from the MSW  Improve landfill gas and stormwater collection systems after recent extensive rain  Continue to monitor for H 2 S in surrounding communities Short Term Solutions

Operational Changes Long Term Solutions  Increase landfill gas collection system capacity  Install final cover when feasible  Evaluate landfill operational procedures  Maintain separate C&D and MSW  Implement recommendations from odor assessment 14

Presentation Overview  Background  Operational Changes  Community Outreach 15

Community Outreach  Community meeting invite sent to 2,000 residences – Meeting held at Utilities Admin Building on September 16, 6:00 p.m. – 46 attendees  Follow up meeting scheduled for October 28  Information to be posted on county website 16

Landfill Odor Action Plan Utilities Department October 6,