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