Laserfiche WebLink
ATTACHMENT A <br />LEAK LOCATION TESTING <br />PART 1 GENERAL <br />1.1 WORK INCLUDED <br />A. This section includes required methods for leak location testing on an HDPE <br />Geomembrane. Tests shall be performed on both the geomembrane in an <br />uncovered state and on the geomembrane once the overlying granular drainage <br />material and protective operations layers are placed. <br />1.2 REFERENCES <br />A. ASTM Technical Guide D-6747 <br />1.3 QUALIFICATIONS <br />A. Leak Location Contractors shall demonstrate successful experience in performing <br />large-scale leak location surveys for geomembranes alone and geomembranes <br />covered with soil. The Leak Location Contractor shall have performed at least <br />10,000,000 square feet of surveys in the previous three years. <br />1.4 SUBMITTALS <br />A. Submit qualifications of proposed Leak Location Contractor to QA/QC <br />AINk CONSULTANT and O R. Leak Location Services, Inc. (contact: Darren <br />IFLaine 210.408.1241) has been preapproved as a Leak Location Contractor. <br />PART 2 DEMONSTRATION <br />2.1 GENERAL <br />A. The preparations, operation of the system, and survey parameters shall be verified <br />by performing tests over two artificial leaks. An artificial leak is an electrical <br />simulation of a leak consisting of an area of metal the size of the desired leak <br />connected to an insulated wire. The other end of the wire is connected to a ground <br />electrode. The test parameters and procedures shall be: <br />1. An artificial leak with a diameter of 0.64 cm (0.25 -inch) shall be placed at <br />ground surface and an artificial leak with a diameter of 1.27 cm (0.5 -inch) <br />shall be buried at a depth of two -feet below ground surface. <br />2. A line of data shall be taken and recorded directly over the artificial leak for <br />a distance of at least 20 -feet in front and behind the artificial leak with the <br />artificial leak disconnected to measure and quantify the background noise <br />level (BN). The background noise level shall be defined as the difference <br />between the maximum and minimum measured voltage with the artificial <br />leak disconnected. <br />3. The artificial leak shall be connected and leak location measurements shall <br />be made and recorded along closely -spaced parallel lines in the vicinity of <br />the artificial leak. The lines shall be centered on the artificial leak and <br />extend at least 20 feet in front and behind the artificial leak. This data is the <br />leak signal plus noise signal (S+N). <br />4. The recorded leak location data shall be examined to determine the peak -to - <br />Forward Landfill WMU FU -13 ATTACHMENT A <br />1 LEAK LOCATION TESTING <br />