Table of Contents

Introduction
Definitions
Aquifers
Consolidated Formations
Unconsolidated Formations
Water Entrance Velocities
Well Hydraulics
Natural Development
Screen Openings
Gravel Pack Thickness
Sanitary Well Seal
Annular Seal
Unsafe Coliform Results
Drainage from Well Head
Screen-Blank-Screen
Initial Well Development
Pump Testing
Specific Capacity
Draw Down
Discharge Capacity
Oxygen
Well Efficiency
Identification of Problems in a Well
Water Well Rehabilitation Benefits
Unsafe (Bacteriological) Water Quality Issues
Lost Capacity
Zone of Fouling
Build Up of Materials in Wells
Ground Water Microbiology
Current Bacterial Testing Methods
Phosphorus Treatment Products
Other Organisms in Ground Water Systems
Surface Water Infiltration
Well Screen Slot Design
Cemented Gravel Pack
Rate of Lost Capacity
Shock Chlorination
Corrosion Problems
Red Water Problems
Single Well Water Quality Variations
Odor Problems
Unsafe Bacterial Loadings
Hygiene Risk Survey on Wells
Well Hydraulics
Position of Biofouling Relative to the Well Screen
Suction Flow Control Devices
Major Water Well Concerns
Economic Analysis of Water Well Rehabilitation
Nitrate Problems in Wells
Sulfur Cycle in Ground Water
Causes of Well Plugging Problems
Tests for Bacteria Causing Plugging Problems
Diagnosis of Problems in a Plugging Well
Water Well Rehabilitation Techniques
Stages in Rehabilitation
PVC Wells and Biofouling
Rate of Iron Deposition
Chemical Application in Water Well Rehabilitation
Summary of Application Methodologies
Selection of Acids
Advances in Technologies for Water Well Rehabilitation
Use of Liquid Carbon Dioxide in Water Well Rehabilitation
Efficacy of Using Pellet Chlorinators in Wells
Environmental Safety Concerns
Well Development
Preventative Maintenance of Wells
Chlorine Chemistries
Final Summation