The Driller
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • CLASSIFIEDS
  • EQUIPMENT
  • SAFETY
  • VIDEOS
  • EDUCATION
  • SOURCEBOOK
  • EVENTS
  • SUBMIT
  • ABOUT
  • SIGN UP
cart
facebook twitter linkedin youtube
  • NEWS
  • Water
  • Geothermal
  • Construction
  • Environmental
  • Mining
  • All Industry News
  • EQUIPMENT
  • Rigs & Heavy Equipment
  • Consumables
  • Pumps
  • Featured Products
  • VIDEOS
  • Newscast
  • Drill Talks
  • Ask Brock
  • Emerging Drillers
  • EDUCATION
  • Drilling Business Insights
  • Reference Desk
  • Sponsored Insights
  • EVENTS
  • Conferences & Demo Days
  • Newscast LIVE
  • SUBMIT
  • Drillers @Work
  • ABOUT
  • Contact
  • Advertise
The Driller
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
The Driller
  • NEWS
    • Water
    • Geothermal
    • Construction
    • Environmental
    • Mining
    • All Industry News
  • CLASSIFIEDS
  • EQUIPMENT
    • Rigs & Heavy Equipment
    • Consumables
    • Pumps
    • Featured Products
  • SAFETY
  • VIDEOS
    • Newscast
    • Drill Talks
    • Ask Brock
    • Emerging Drillers
  • EDUCATION
    • Drilling Business Insights
    • Reference Desk
    • Sponsored Insights
  • SOURCEBOOK
  • EVENTS
    • Conferences & Demo Days
    • Newscast LIVE
  • SUBMIT
    • Drillers @Work
  • ABOUT
    • Contact
    • Advertise
  • SIGN UP
MarketsOpinionsEnvironmental Monitoring

Sampling Monitoring Wells

By Thomas Kwader P.G., Ph.D.
October 1, 2003
There are preparations to make before beginning to sample a monitoring well.

Sampling a monitoring well for a ground water investigation. Photo courtesy of U.S. Army Corps of Engineers.
In order for a water sample to be representative of the formation, the monitoring well must be properly purged prior to collecting the sample. If the well is purged too harshly, the sample may be turbid, and the sample will contain colloidal and clay size particles that will influence both volatile and metal concentrations and, therefore, not be representative of the formation. Pumping large volumes of water quickly with submersible pumps or bailing the well near dry may cause turbulence outside of the well screen and disturb sediments in the bottom of the well.

If the well is purged by pumping from the screen or at the water level in the casing, water in the casing column will not be removed. Care should be taken not to sample this stagnant water. The standing water above the well screen should be removed by bailing or by pumping from the top of the water surface so that water is displaced upwards from the screen to the water table.

If pumping is an acceptable method for sample collection, then the pump (or intake tube) should be placed just below the top of the screen. Pumping should continue until the field water quality parameters stabilize.

The parameters often used to determine if the water sample is representative of the formation water include temperature, pH, specific conductance, turbidity and dissolved oxygen. Generally, the water sample is considered to be at equilibrium if the measurements have not changed significantly (5%) over the last well volume or 10 minutes of purging.

Considering the fact that ground water generally moves very slowly (usually less than a foot per day), ground water samples generally should not vary greatly between sampling events. The goal of collecting ground water samples should be to remove all of the factors affecting the quality of the sample. Using the same personnel, sampling equipment and methods will help to provide sample collection consistency, which will produce data that can be used to monitor true changes in ground water.

KEYWORDS: groundwater monitoring monitoring wells water sampling

Share This Story

Looking for a reprint of this article?
From high-res PDFs to custom plaques, order your copy today!

Thomas Kwader, Ph.D. , P.G., is a regular contributor to The Driller.

Recommended Content

JOIN TODAY
to unlock your recommendations.

Already have an account? Sign In

  • geotechnical drilling rig

    6 Onsite Phrases Environmental Drillers Hate

    Here are six phrases that highlight common frustrations...
    The Underground Network
    By: Jeff Garby
  • Wayne Nash

    Pipe Stuck? Common Causes and Solutions for Drillers

    If you have drilled for any length of time, sooner or...
    Markets
    By: Wayne Nash
  • deep water well

    Selecting and Sizing Submersible Pump Cable

    This article helps pump installers and servicers decide...
    Opinions
    By: Bob Pelikan
You must login or register in order to post a comment.

Report Abusive Comment

Manage My Account
  • eNewsletters
  • Online Registration
  • Subscription Customer Service
  • Manage My Preferences

ClimateMaster’s “Geo Joe” Discusses Industry Growth Through State Organizations

ClimateMaster’s “Geo Joe” Discusses Industry Growth Through State Organizations

The Driller Newscast - The Exit Interview: The Battle of Bron vs. Brock

The Driller Newscast - The Exit Interview: The Battle of Bron vs. Brock

The Driller Newscast: Hard Hats, Hot Topics, and Dad Jokes

The Driller Newscast: Hard Hats, Hot Topics, and Dad Jokes

The Driller Newscast - The Big, Not-So-Beautiful Bill: How to Lose Clean Energy and Alienate the Planet

The Driller Newscast - The Big, Not-So-Beautiful Bill: How to Lose Clean Energy and Alienate the Planet

More Videos

Sponsored Content

Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the The Driller audience. All Sponsored Content is supplied by the advertising company and any opinions expressed in this article are those of the author and not necessarily reflect the views of The Driller or its parent company, BNP Media. Interested in participating in our Sponsored Content section? Contact your local rep!

close
  • demo of a DM450 drilling rig during a customer factory visit
    Sponsored byGeoprobe

    Built for You: Smarter Drill Rigs, Stronger Support, Bigger Opportunities

Popular Stories

The Driller Newscast episode 149: Hard Hats, Hot Topics, and Dad Jokes

Hard Hats, Hot Takes, and Dad Jokes: Drillers Talk Safety and Geothermal’s Future

A side profile of a coal mine

Interior Approves Bull Mountains Coal Mine Expansion

An image of a pair of boots

The Job Site Fit Check: Boots

The Driller Classifieds

COMPRESSORS

EAST WEST MACHINERY & DRILLING IS BUYING AND SELLING AIR COMPRESSORS, AIR BOOSTERS, AIR ENDS & PARTS
Company: East West Machinery

DRILL RIGS

LOOKING FOR LATE MODEL TOPHEADS & DRILLTECH D25'S
Company: Spikes’s Rig Sales

DRILL RIG PARTS

MEETING DRILLERS NEEDS AROUND THE WORLD
Company: East West Machinery

ELEVATORS

SEMCO INC. PIPE ELEVATORS
Company: Semco Inc.

GROUTERS

GROUTING EQUIPMENT - GROUT PUMPS & GROUT HOSE REELS
Company: Geo-Loop Inc.

PUMP HOISTS

SEMCO INC. - BASIC PUMP HOISTS
Company: Semco Inc.

WELL PACKERS

LANSAS PRODUCTS - INFLATABLE WELL PACKERS
Company: Vanderlans Lansas Products

WELL SCREENS

WELL SCREENS & SLOTTED PIPE
Company: Alloy Screen Works

Products

Water Quality Engineering: Physical / Chemical Treatment Processes

Water Quality Engineering: Physical / Chemical Treatment Processes

By carefully explaining both the underlying theory and the underlying mathematics, this text enables readers to fully grasp the fundamentals of physical and chemical treatment processes for water and wastewater.

See More Products

The Driller E.G.O. Award - Enter now!

Related Articles

  • Sampling of Ground Water Monitoring Wells - Part 2

    See More
  • Sampling of Ground Water Monitoring Wells - Part 1

    See More
  • Sampling of Ground Water Monitoring Wells - Part 3

    See More

Related Products

See More Products
  • drilling engineering.jpg

    Drilling Engineering Problems and Solutions: A Field Guide for Engineers and Students

  • nat-engineered-solutions-dr.gif

    Natural and Engineered Solutions for Drinking Water Supplies

See More Products
×

Dig deeper into the drilling and water supply industry!

Build your knowledge with The Driller, covering the people, equipment and technologies across drilling markets.

SIGN UP NOW
  • RESOURCES
    • Advertise
    • Contact Us
    • Directories
    • Store
    • Want More
    • Classifieds
  • SIGN UP TODAY
    • Create Account
    • eNewsletters
    • Customer Service
    • Manage Preferences
  • SERVICES
    • Marketing Services
    • Reprints
    • Market Research
    • List Rental
    • Survey/Respondent Access
  • STAY CONNECTED
    • LinkedIn
    • Facebook
    • YouTube
    • X (Twitter)
  • PRIVACY
    • PRIVACY POLICY
    • TERMS & CONDITIONS
    • DO NOT SELL MY PERSONAL INFORMATION
    • PRIVACY REQUEST
    • ACCESSIBILITY

Copyright ©2025. All Rights Reserved BNP Media.

Design, CMS, Hosting & Web Development :: ePublishing

The Driller
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
The Driller
  • NEWS
    • Water
    • Geothermal
    • Construction
    • Environmental
    • Mining
    • All Industry News
  • CLASSIFIEDS
  • EQUIPMENT
    • Rigs & Heavy Equipment
    • Consumables
    • Pumps
    • Featured Products
  • SAFETY
  • VIDEOS
    • Newscast
    • Drill Talks
    • Ask Brock
    • Emerging Drillers
  • EDUCATION
    • Drilling Business Insights
    • Reference Desk
    • Sponsored Insights
  • SOURCEBOOK
  • EVENTS
    • Conferences & Demo Days
    • Newscast LIVE
  • SUBMIT
    • Drillers @Work
  • ABOUT
    • Contact
    • Advertise
  • SIGN UP