INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Taking samples from old wells

Taking samples from old wells

(OP)
Hi everybody.
Water quality sampling is to be done for 7 wells. The problem is that these wells are currently out of service and they have been out of service for almost a year, but the authorities want to put them back to work and they need to check for the quality of the water.
The question is:
For how long should they "flush" the water out, before taking the samples in order to collect valid samples? Bare in mind that all of the water being pumped out is going to be wasted, and that electricity cost for the pupms is high.

Thank you in advance for your answers.
Mirko

RE: Taking samples from old wells

Pick a number of easy field tested parameters eg: conductivity, pH , turbidity.
Sample the well when you start pumping and test for the parameters chosen.
Test every couple of hours for a start and record the results.After a while you will have a good feel for the results and you may be able to test less frequently perhaps once per day.
I can't give any advice on how long it might take but continue to test and pump until all the parameters stabilize and flat line.

It is after the results flat line that you should be able to consider getting proper samples, tested in a lab for all the parameters that you desire.
Some parameters not tested in the field might still require further pumping but it will be likely if you follow the process described that most of the old water will be gone and your samples will represent the actual quality of the well.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

RE: Taking samples from old wells

(OP)
Thank you for a great advice! The only issue is that we have no field engineer on the location and it is very far from our headquarters, but maybe we could hire somebody...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close