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

How Many Monitoring Wells Will Be Enough?

By Thomas Kwader P.G., Ph.D.
July 1, 2002
Thomas Kwader reminds us that monitoring well data are only important if the wells are in the proper locations and the data are being analyzed to assess the progress toward the goals of the program.

Twenty years ago, three wells were about all you needed to monitor almost anything -- a gas station or a 20-acre landfill, one upgradient and two downgradient. There is no doubt that many sites still don't have enough monitoring wells to monitor properly for contamination. On the other hand, there are many sites in which too many wells are being monitored for too long and not much is being done with the data collected.

Before we can address how many wells are being monitored, we must know what the objective of the monitoring program is. Generally, we monitor ground water levels and chemical constituents to assess the movement or cleanup progress of a contaminant in the subsurface. The number of wells necessary to accomplish this is dictated by many factors, including the complexity of the site's hydrogeologic conditions; the rate, or ground water flow; how many source areas are present; the mobility of the site compound of concern, including the specific gravity or weight of the compounds, etc.

One of the most important factors that must be understood is the site's hydrogeologic framework. We must know what the subsurface looks like, how many aquifers and confining beds are present, the horizontal extent of these units, and the vertical connection between these zones. How does the ground water flow across the site? In preferred channels? Does the ground water "stair-step" progressively downward as it moves laterally? Information helpful in mapping the subsurface includes continuous split spoon samples, cores and borehole geophysical logs.

Initially, when a site is assessed, a large number of temporary wells are installed throughout the site to assess the number and shape of plumes beneath the site. The temporary wells most often are constructed by the hollow stem auger drilling method or direct-push technology, which may be accompanied by a mobile laboratory that can analyze site compounds of concern within an hour of sample collection. This real-time data then can be used to guide the location of future wells.

One problem is that these temporary wells don't stay temporary, and many wells are added to a long-term monitoring program, which provides little useful information regarding movement of the plume.

At many sites, monitor well sampling can be reduced and frequency of sampling reduced after years of data have been collected, based on the prevailing trends at the site.

Again, monitoring well data are only important if the wells are in the proper locations and the data are being analyzed to assess the progress toward the goals of the program.

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
  • submersible pumps, water well pumps

    Selecting and Sizing Submersible Pump Cable

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

Report Abusive Comment

Subscribe For Free!
  • eNewsletters
  • Online Registration
  • Subscription Customer Service
  • Manage My Preferences

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

MainPhotoTwoBrothers.jpg

Two Brothers' Journey Through the Drilling Industry

Tariffs

Tariffs Shake Up the Drilling Industry

AI and Drought Concerns

AI’s Growing Thirst for Water and Power

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

Subscribe to The Driller Newscast

Related Articles

  • How Deep Should a Monitoring Well Be?

    See More
  • Ask Brock video series

    How Many Wells Does it Take to Become a Great Driller?

    See More
  • The Importance of Developing Monitoring Wells

    See More

Related Products

See More Products
  • M:\General Shared\__AEC Store Katie Z\AEC Store\Images\ND\new site\a-builders-guide-to-wells-a.gif

    A Builder's Guide to Wells and Septic Systems, Second Edition

  • fracturingwells.jpg

    Fracturing Horizontal Wells

  • M:\General Shared\__AEC Store Katie Z\AEC Store\Images\ND\new site\water-well-pumps.gif

    Audel Water Well Pumps and Systems Mini-Ref

See More Products

Related Directories

  • Allegheny Instruments Inc.

    GeoVISION borehole video camera systems. Portable systems and small-diameter cameras to inspect water wells and boreholes, with interchangeable cameras including joystick-controlled Motorized Pan and Tilt, Dual Scan Micro camera, and our 3/4-inch diameter Nano camera. Manual and electric winches to 2,000 feet. Made in the USA since 1989.
×

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