Table of contents

Odor Control Update

2006 Activities

2007 Activities January - August

2007 Activities August - September

2007 Activities September - December

Wastewater Treatment Facility

Locations of Complaints

Frequency of Complaints

Odorous Compounds in Wastewater

Evaluation of Odors

Odor Generation in Wastewater Systems

Hydrogen Sulfide WWTP Influent Structure

Sulfate Reducing Bacteria

Biochemical Process of Sulfide Formation

Characteristics of Sulfide Production

27-Inch Pipeline Lift Station A to WWTP

Methods to Control Odors

Weekly Flushing Sodium Hydroxide Addition

State Regulations on Odors

Scope of Work Webster Environmental Inc.

Strength of Odors Treatment Processes

Strength of Odors Property Boundaries

Odor Emission Rates

Ferric Chloride Pilot August 16, 2007

Conclusions and Findings Webster Environmental, Inc.

Chemical Treatment Alternatives

Chemical Treatment Cost Estimates

Recommendations Webster Environmental, Inc.

Calcium Nitrate Pilot October 15 – 19, 2007 (Week 1)

Slide 30

Cumulative Cost of Odor Control Efforts

Recommended Action Plan

Implementation Schedule

Items for Council Consideration

Questions and Discussion