About Contact Blog Site Map
Receive Updates News service@midwestgeo.com

Is Now the Time to Curb the Urge to Purge?

Discover the advantages and latest advances about no-purge sampling. Learn why there is a growing interest in no-purge sampling and it's contrasting procedures to traditional groundwater sampling methods. Each of the common ground water sampling methods, volume purging, low flow sampling and no-purge sampling will be described and the differences between the sampling methods will be examined.

The variations of no-purge sampling devices will be introduced with discussion of how they work and advantages and limitations of each class of sampler. Finally, an in depth discussion of the advantages and limitations of no-purge sampling and supporting case histories will be presented to help you determine what options may work best for your project site.

What is no-purge (passive) ground water sampling and why has it become the fastest growing ground water sampling method?


  • The history and evolution of ground water sampling methods.
  • Why well purging began.
  • Examination of the different sampling methods and their effect on samples.
  • Why different sampling methods sometimes yield different results.
  • Types of no-purge sampling devices and how they work.
  • Advantages of no-purge sampling with case studies.
  • Limitations of no-purge sampling.
  • Summary and questions.

What you will learn:

  • Will learn what no-purge ground water sampling is.
  • Understand why many sites are switching to no-purge sampling.
  • Learn the differences between volume purging, low-flow and no-purge sampling and decide which is most suitable for their sampling requirements.
  • Learn about the three different classifications of no-purge ground water samplers
  • Discover how switching to no-purge methods provides formation quality ground water samples with a 50-80 percent reduction in cost and energy while improving site safety.

Fee: 299.00 USD Per Computer Site (unlimited participants per site).
Instructor: Kent Cordry
President of GeoInsight, Inc.

Pay one site registration fee and an unlimited number of participants from your organization can attend at that site.

Participants will receive a handout referencing the webinar topics and discussion.

Webinar Duration: 90 minutes (1.5 hours)
Earn 1.5 Professional Development Hours (1.5 PDH) for this webinar.

A Record of Attendance Form is included free with each webinar for your record keeping and individual PDH verification. We ask your on-site coordinator to return the completed and signed copy of the Form to us following the webinar for (1) maintaining a separate copy as a service to attendees and (2) forwarding to NIU confirming attendance for those who order certificates.

Attendees may also order an official a Course Completion Certificate from Northern Illinois University for a small administrative fee. The Certificate is optional and may be ordered separately following the webinar to confirm your attendance and showcase the certificate on your office wall. Instructions for ordering certificates are given during the webinar.

* This webinar is eligible for the ’BUY THREE, GET THREE’ discount.

Attendees will be invited to actively participate during this live and interactive on-line web seminar. Discussion is planned following the webinar for those who want to continue the session. Bring your questions to the webinar and present them to the instructor and other participants for exploring the best solution.

Kent Cordry has been active in the ground-water monitoring field for over 30 years. He is the founder and president of GeoInsight; a company established in 1991 that focused on the development and production of innovative direct-push equipment. In 1996, he received the National Groundwater Association Technology Award for major contributions to the groundwater industry related to direct push groundwater sampling. In the summer of 1999, Mr. Cordry began development of the HydraSleeve no-purge (passive) groundwater sampler and has since received two patents for the invention. In total he holds ten patents, including those covering the HydroPunch I, HydroPunch II and the HydraSleeve.

Prior to starting GeoInsight, Mr. Cordry spent 10 years as an environmental consultant, serving as project manager/senior hydrogeologist, managing site assessments throughout the United States. Mr. Cordry also served as a division manager for a Midwestern drilling company. He is a Certified Professional Geologist and Certified Drilling Contractor.

Questions? Email us at service@midwestgeo.com or call 763.607.0092

Webinar Topic Suggestion: Click Here
Members Login
Become A Member

It's Free, It's Easy and as a
Member you'll enjoy...
  • Exclusive Videos
  • Special Pricing
  • And Much More

Learn More