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R.J. Gordon Construction LLSI Project 2211 <br />October 30, 2015 Page 3 of 5 <br />FIGURE 1. - BARE LINER SURVEY OF AREA 2A AT THE FOOTHILL <br />SANITARY LANDFILL <br />Soil Area Surveyed Per ASTM 7007 <br />9/15115-9/16/15 <br />Soil Area Surveyed Per ASTM 7007 <br />9/11/15-9/13/15 <br />FIGURE 2. - SOIL SURVEY OF AREA 2A AT THE FOOTHILL <br />SANITARY LANDFILL <br />II. PRINCIPLE OF THE ELECTRICAL SURVEY METHOD <br />A. General <br />n0h <br />n0h <br />The electrical leak location method detects electrical paths through the liner caused <br />by water or moisture in the leaks. A voltage is impressed across the geomembrane being tested. <br />Electrical current flowing through any leaks in the geomembrane produces localized anomalous areas <br />of high current density near the leaks. These areas are located by making electrical potential <br />measurement scans in or on the electrically conductive material covering the geomembrane. <br />