Table 2 – Summary of Survey Information
1. Do your regulations contain general and/or specific requirements for CQA conformance testing for geomembranes, geotextiles, geocomposites, geogrids and plastic pipe?
All yes except pipe
GM and pipe
If no, does your agency rely upon:
US EPA guidelines (min. tech. guidance)
Design consultant’s data
Literature or historical data
Other - CQA conformance plans
Does your regulation specifically state the interval for destructive seam
sampling of geomembranes?
If yes, at what interval?
If no, how do you approach the situation?
Design consultants recommendation
CQA organization recommendation
Other- Independent contractor Use Standard of 500 ft or GM14
Do your regulations or guides allow for a nondestructive (NDT)
alternative to destructive tests? Allows infrared sensing Allows ultrasonic testing Allows electrical leak integrity survey Allows spark testing Other – Air lance testing Vacuum chamber method Requires NDT testing, but method not specified
7. Does the use of any of these NDT methods allow for reduction or elimination of the destructive sampling protocol?
Total No. of States
9 2 22 8 2
43 21 17 13 7
13 - all at 500’
13 16 9 1 2
7 7 12 10 5 3 5
3 15 6