Introduction

1. Effective Strategies for Residual Polymer and Aquatic Toxicity Testing For Dredge Slurry Dewatering Western Dredging Association 2012 Midwest Chapter Randy Wilcox, Gregg Lebster WaterSolve, LLC Bruce Rabe Environmental Resource Management April 27, 2012

2. Introduction • Chemical Conditioning Basics • Residual Polymer in Return Water • Aquatic Toxicity Testing • Residual Polymer Testing • Case Studies

3. Chemical Conditioning • Determination of Objectives • Consolidation • Effluent / Filtrate characteristics • Removal of contaminates • Other objectives

4. Chemical Conditioning • Dewatering Chemicals • Organic Flocculants • Organic Coagulants • Inorganic Coagulants • Hybrid Chemistries

5. Chemical Conditioning • Description of Application • Inline Injection • Mixing Energy Requirements • Options for Automatic adjustment of feed rate • Adjustment based on visual observation

6. Preliminary Testing • Polymer Selection and Dose Determination (Jar Testing) • Larger Scale Test • Geotube Dewatering Test (GDT) • Hanging Bag Test • Pilot Scale Test

7. Aquatic Testing Basics • State Regulatory Requirements • Testing Requirements • Specific Test Objectives • Salinity • Test Species • Test Duration • Test End Points Fathead Minnow Daphnia magna

8. Aquatic Toxicity Testing • Sample Collection • Test Initiation • Solution preparation • Water quality • Organism Loading • Test Monitoring • Observations • Test solution renewal

9. Aquatic Toxicity Testing (cont.) • Test Determination • Survival • Growth • Reproduction • End point • Data Analysis / Statistical Evaluation

10. Residual Polymer Testing • Description of “China Clay” Test • Qualitative Test • Quantitative Test

11. Case Studies • Florida Keys Project • Southern Shores, NC Project

12. Questions? WaterSolve, LLC 4964 Starr Street, SE Grand Rapids, MI 49546 (616) 575-8693 (616) 575-9031 (fax) www.gowatersolve.com www.geotube.com