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This is a sample outline of CQA protocol for a liner integrity
survey on a geomembrane over aconductive material before and after
it is covered with soil. It should be used as a guide andnot
verbatim. TRI Environmental (TRI will review your specific
application and recommendchanges to the CQA guidance as needed.
Contact TRI personnel at (!"" !!"#TE$T orabec%&tri#env.com.
CQA FOR GEOMEMBRANE LINER INTEGRITY TESTING
PART 1 GENERAL
The purpose of the CQA agency overseeing a Liner Integrity
Survey is to confirm that the LinerIntegrity Contractor conforms to
the general intent of the ASTM methods. The conformancerelies on
performing the sensitivity test and subsequently performing the bul
survey !ith theparameters used in the sensitivity test. In
addition" the CQA agency should verify the spatiale#tents of the
survey. A $blind hole% is defined as a hole created in the
geomembrane by theCQA agency. &ue the nature of liner integrity
testing as a non'destructive test method" the useof blind holes is
not encouraged. The ability of a Liner Integrity Consultant to
locate e#isting"or blind holes during the application of a survey
should be determined during the qualification
stage of a pro(ect. )or Liner Integrity Contractor
qualifications please see T*I+s samplespecifications.
,.- AT/* 01&&L/ A2& AT/* LA2C/ M/T34&S
A. Sensitivity Test
,. The sensitivity test shall be performed by drilling a hole
into the liningsystem or a portion of the geomembrane off to the
side of the surveyarea per ASTM guidance. The hole should not be
drilled in a location"!hich compromises the containment system and
requires repair.
5. The CQA technician shall observe the lea detection method
and
equipment operation. The lea must be easily detected by
theequipment operator during the sensitivity test.
6. If it is compromising to perform the sensitivity test on an
actual hole" anartificial lea may be used if it is representative
of site conditions and thelea path is force through the longest
distance of earth ground that anactual hole !ould require during
the survey.
7. Survey Method
,. The CQA technician shall observe that the survey is performed
in thesame manner as the sensitivity test.
5. The CQA technician shall visually observe that the Liner
IntegrityContractor has tested the entire survey area. Alternately"
the LinerIntegrity Contractor can submit proof by !ay of 80S data
acquisition thatthe entire survey area !as adequately covered.
C. 7lind 3oles
,. If the CQA agency suspects that the sensitivity test
performed by the
CQA 8uidance 7are and Soil'Covered Liner Methods*evision , '
2ovember 5-,5 8eomembrane Liner Integrity Testing
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Liner Integrity Contractor does not represent e#isting site
conditions foran actual hole" a hole may be drilled in the
geomembrane per the ASTMguidelines !ith prior approval by the
8eneral Contractor" the LinerInstaller" and the Site 4!ner.
5. If said Liner Integrity Contractor fails to locate the blind
hole" the blindhole shall be investigated for conformance !ith ASTM
blind holeguidelines. If the blind hole placement fails to meet
ASTM guidelines"
the failure to locate the blind hole shall be disregarded.
6. If said Liner Integrity Contractor fails to locate the blind
hole and theblind hole !as placed in conformance !ith ASTM
guidelines and there isno technical reason such as variable or
adverse site conditions for thehole to have been missed by the
Liner Integrity Contractor" the entireliner integrity survey shall
be repeated until the Liner Integrity Contractorcan demonstrate the
ability to locate a blind hole.
9. If used" the blind hole should be created to!ard the
beginning of theliner integrity survey area so that any issues !ith
locating the hole canbe flushed out before performing a significant
portion of the survey.
5.- &I04L/ M/T34&
A. Sensitivity Test
,. The sensitivity test shall be performed using an artificial
lea per ASTMguidance.
5. The CQA technician shall observe that the artificial lea is
grounded in alocation" !hich represents $!orst case% conditions for
actually locating ahole in the survey area. The CQA technician
shall note the grid spacingused in the sensitivity test and the
position of the dipole measurement inrelation to the artificial lea
location. The CQA technician shall observe
that the location of the sensitivity test is at the furthest
distance from thecurrent in(ector electrode in the survey area. The
CQA technician shallnote the voltage and current used during the
sensitivity test.
7. Survey Method
,. The CQA technician shall observe that the survey is performed
in thesame manner as the sensitivity test and shall note the
voltage andcurrent used during the survey.
5. The CQA technician shall visually observe that the Liner
IntegrityContractor has tested the entire survey area. Alternately"
the Liner
Integrity Contractor can submit proof by !ay of 80S data
acquisition thatthe entire survey area !as adequately covered.
C. 7lind 3oles
,. If the CQA agency suspects that the sensitivity test
performed by theLiner Integrity Contractor does not represent
e#isting site conditions foran actual hole" a hole may be drilled
in the geomembrane per the ASTM
CQA 8uidance 7are and Soil'Covered Liner Methods*evision , '
2ovember 5-,5 8eomembrane Liner Integrity Testing
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