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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 /> CONSULTANT and OWNER. Leak Location Services, Inc. (contact: Darren <br /> Laine 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 /> COMPOST FACILITY STORMWATER IMPROVEMENTS ATTACHMENT A <br /> 1 LEAK LOCATION TESTING <br />