Lining the 70 Ranch Raw Water Reservoir that work crews simultaneously carried out seven construction operations on the side slopes that were staged to provide completion and cover protection of the geomembrane as it was installed. The reservoir bottom operation required four distinct operations that work crews carried out sequentially. FIGURE 4 (TOP) Cover soil placement by Global Positioning System (GPS)-guided low ground pressure (LGP) dozer and tracked skid-steer loader. Note minimal wrinkling/ waves during placement. FIGURE 5 (BOTTOM) Electrical leak location (ELL) survey revealed significant damage from contractor equipment during cover soil placement on bottom lining system ELL survey In addition to routine CQA/CQC testing of geomembrane seams by trial welds, NDT air lance and destructive sampling, it was decided early in the project to test the completed sections using ELL survey to primarily detect damage due to soil and rock cover operations. The leak location survey company performed the ELL survey in accordance with ASTM D7007 using dipole measurements on 30 Geosynthetics | April May 2022 the soil and rock-fill cover materials. A water puddle survey was conducted on the lower slope bare liner. The survey was performed as the liner system was completed and required return trips and mobilizations to complete. The ELL survey mostly found damage caused by installation equipment during the bottom liner soil cover operation. Minimal damage was found in the upper geocell/ rock-covered section of the slope. Once the survey detected damage, the area was carefully excavated, and the liner repaired and re-covered. A total of 79 leak sites with minor to significant mechanical damage were detected and repaired. Figure 5 illustrates typical equipment damaged area that required repair. It should be noted that no leak sites were found in more than 25 miles (40 km) of thermal fusion field welds.