June 2007 Newsletter

Untitled Document

Subsurface Imaging

HOME

ABOUT

Ground Imaging Solutions

Clear subsurface Images since 1985
July 2007 Newsletter

Click here to Subscribe

Click here to unsubscribe

We are now at July already.

The Tri-Nations Rugby will probably be sorted by the time you read this. Here is good luck to everyone and may the best team win. I have been also watching the antics of a couple of yachts in Valencia. Both of these show the value of teamwork, SSI aspire to these terrific examples.

Here our ideas to add geophysical techniques to your projects. We are always on the end of the phone or email us to review any issues you may have and offer ways to create solutions with geophysics. In this newsletter we discuss things to keep in mind when considering geophysics, a recent project using borehole radar and using GPR for void location.

Ways to get good value from Geophysics

1) Do Geophysical surveys because it delivers results not because its a pretty picture

2) Use combinations (more than one geophysical method and physical investigation) and consider more one technique for a solution.

Electrical Resisvity Imaging - Image Coal Seams

Using ERI and drillholes in combination to image disrupted Coal Seams.

3) Consider first the value of your contractors expertise and communication (i.e. understanding), only then think about the contract price. Focus on results and how much they are worth to you and then look at the value of the results versus the survey cost (SSI can help you with this).

Here an idea of how to review use of geophysics or direct methods (these are examples and not an absolute measure of costs. The actual cost will change between sites)

Technique	Cost saving per m / Benefits	Geophysics Cost per meter	Negatives
ERI Coal Exploration	$19.75	$9.00	Decreased JORC compliance
	(Less Drillholes)
GPR Bauxite Exploration	$25 (Less drillholes)	$6	Less product to test

4) You must test and validate the geophysics with direct investigation methods.

----------------------------------------------------------------------------------------------------

SSI have experience in using geophysical methods in many countries and environments.
We offer a range of techniques.
We offer consulting on what techniques and combinations of methods to use.
We always recommend truthing the results.

Call Grant at SSI or email us at info@ss-ibiz discuss how SSI can help your site or company.

----------------------------------------------------------------------------------------------------

Borehole GPR

Subsurface Imaging's borehole GPR antenna goes through its paces over the last 12 months.

SSI routinely run sondes and instruments in bores so this is nothing new for us. But the data and the results are always unique to each site.

Our customer wanted to confirm the positions of foundations under a culvert. There was no direct surface access. We drilled a series of bores specifically for the GPR survey.

The GPR successfully imaged the foundations and has helped guide the construction progress

Bore GPR Collecting GPR Data

Collecting Bore GPR data on site

Bore GPR has many applications which include,

· locating objects

· mapping mineral contacts

· imaging voids.

Call Grant at SSI or email us at info@ss-i.biz for more information

----------------------------------------------------------------------------------------------------

Underground cavity location

Void location is an application that is particularly successful with geophysics. SSI use both Ground Radar and Resistivity Imaging to map possible voids.

SSI have a concept known as a Radar Void Signature ^tm (RVS) which is one typical of a void. Ground truthing may change how this RVS ^tm is used but this concept is a useful one as it enables predictive testing of the signature. This signature is partly theoretical and partly based on practical work imaging voids.

SSI have worked with void location in Australia, New Zealand and SE Asia and are routinely consulted by major Corporations and Consulting organizations on technologies to map voids. Typically we find that voids have a signature but it needs careful consideration for successful survey design.

Questions we ask are:

Is the void an open cavity?

Its expected size?

Is it filled with weak material or fluid?

What is above the void i.e. rock sediment or debris?

Pipe at 12 m with GPR

Void detected at 12m depth with GPR

Call Grant at SSI or email us at info@ss-i.biz for more information

Give us a call and discuss your particular requirements. We are capable of customizing data collection and digital data output formats to suit your specific needs.

SSI use a variety of geophysical methods, Radar, EM, Electrical Resistivity Imaging, Cross-hole surveys

Email or Phone

Link to Information Request Form

New Zealand

3061b Gt North Rd

New Lynn Auckland NZ

Phone NZ : +64-9-826-0700

Fax: +64-9-826-0900

Australia

Unit 17 , 3 Hamley Rd

Mt Kuring Gai NSW 2800 Australia1800-359-905

E-mail: info@ss-i.biz

Web http://www.subsurfaceimaging.net