Direct Image by Geoprobe

Geoprobe® Systems has developed Detector Comparisons that are completed by using the "Response Test Procedure" located in the MIP SOP Technical Bulletin MK3010. With this procedure, the probe is immersed for a period of 45 seconds into a cylinder of water containing a dissolved contaminant. This allows the operator to determine if the system is functioning properly, if the membrane is in working order, and if the contaminant of concern can be detected by the current detector scheme.

• SRI DELCD vs. PID Response
  TCE Standard May 2001
• SRI DELCD Response
  PCE Standard May 2001
• HP5890 ECD Response
  TCE/PCE Standard April 2003
• HNU vs. SRI PID Response
  Benzene Standard Feb. 2001
• O.I. PID Response
  Benzene Standard April 2003

Printable version of the above detector comparisons.

Membrane Response vs. Depth

The chart below shows the results of response testing an MIP system while performing a series of logs. This data was collected by Geoprobe® Systems while working on a site contaminated with TCE. A response test was conducted before and after each MIP log. The boxes indicate the current day ending response test and the next day beginning response test. A new membrane was inserted after the first hole on the third day, due to a membrane rupturing on removal of the tool from the subsurface.

Response test data for each MIP project should be plotted in this manner. Besides being a test of the membrane, and indeed the entire MIP system, response test data allows the user to normalize data to a common level.

Membrane Response to 500 µg/L Standard of TCE

10/29/2003 through 11/01/2003
Response test of TCE run before and after each logged MIP location.
Response test run per Geoprobe® Systems SOP.