Water Well Disinfection Workshop
Tell a Friend About This EventTell a Friend

When: May 4, 2017
8:30am - 4:30pm
Where: Preferred Pump
4510 S. Maple Ave
Fresno, California  93725
United States
Contact: Tim Guishard

Online registration is closed.
« Go to Upcoming Event List  

Download the Flyer to hang in the office!


This course has been approved by the State Water Board for 7 Continuing Education Units


- Groundwater Hydraulics to the novice, because it’s critical to understanding how much water is taken into a flooded well based upon

time of flooding, Permeability of the soils or volume of fractures, and static level of the well. 

- The chemical and biological differences and similarities between Surface Water and Groundwater.

- Understanding problems in wells (coliform, E. coli, and Iron Bacteria) including grout failures, corrosion in well casing, inadequate seating of well casing in consolidated aquifers.  

- “Timed” testing in wells to determine if there is a continuing source of organisms to better understand if chlorination could be effective.

-  Understanding well vs system problems by location testing in the system and working back to the well.  

-  Types of local lab testing and differences between Present/Absent and coliform counts.  IDs of Opportunistic Pathogens that

will cause false Present on lab tests.  

-  Chlorine:  Biocidal vs oxidative chlorine products, percentages of chlorine, half life of chlorine.

- Examples of tools and equipment used in well disinfection

-  Factors of successful chlorination in normal wells due to pH of natural water, placement of chlorine, monitoring of chlorine residual, etc.

- Factors of successful chlorination in flood conditions.


About the Instructors: 

Dave Hanson is the president of Design Water Technologies in Shorewood, Minnesota. He started the company in 1991 to create products for the groundwater industry that safely solved problems in wells and systems. He has developed products that successfully treat iron bacteria, mineral scale, and coliform bacteria in wells, treatment facilities, and pipelines. Hanson has also taught numerous seminars on water well design, well efficiency, well rehabilitation, pumping costs, groundwater biology, well problems associated with slime production, odors/corrosion, coliform, bacteria, and sales and marketing. He has authored several technical articles, and was one of the writers for the second edition of Groundwater and Wells.

Tim Guishard has over 32 years of experience in the groundwater industry. He holds certifications from AWWA in several backflow related topics, has held a CDPH T-1 Water Treatment Plant Operator certification, and currently holds a SWRCB certification as a D-1 Distribution System Operator. He is the CGA Education Committee Chairman, and sits on the Scholarship, Legislative, and Convention Committees.