CCR landfill final cover test pad-Part 2 was constructed with cushion geotextile beneath the IDS geomembrane and the first 18 inches (45.7 cm) of cover soil, with a maximum particle size of 4 inches (10.2 cm); the other half had no cushion geotextile and cover soil with a maximum particle size of 9 inches (22.9 cm). The resulting combinations of materials tested in the various test pad subareas are presented in Table 1. 2016 temporary access road construction and investigation After the initial 18 inches (45.7 cm) of soil was placed using an LGP dozer over the lower bench of the test pad, an additional 18 inches (45.7 cm) of nonprocessed (maximum 9-inch [22.9-cm] particles) soil was placed on lower bench Subareas C, D, E and F, for a total cover thickness on the bench of 3 feet (0.9 m). A fully loaded Cat 745C articulated truck with Michelin 29.5R25 tires at 65 psi (448 kPa) tire pressure then made 100 passes over the bench with the 3-foot (0.9-m) thickness of cover (Figure 1 on pages 18-19). Afterward, portions of the trafficked bench were exhumed. GAI Consultants Inc. (GAI) observed the geotextile was FIGURE 2 Exhuming cover soil at Subarea D. No damage to geotextile was observed. The geotextile is being cut to allow observation of the geomembrane. Test Pad Portion Maximum Angular Subgrade Protrusion inches (cm) First Lift1 Second Lift1 Third Lift2 inches (cm) inches (cm) inches (cm) Cover Soil Maximum Rock Size, First Lift inches (cm) Cover Soil Lift Thickness Cushion Geotextile Between Subgrade and Geomembrane? Tested as Haul Road? A 1 (2.5) 12 (30.5) 6 (15) NA 4 (10) No No B 1 (2.5) 18 (46) NA NA 9 (23) No No C&E 1 (2.5) 12 (30.5) 6 (15) 18 (46) 4 (10) Yes Yes D&F 1 (2.5) 18 (46) NA 9 (23) 9 (23) No Yes NA = Not applicable 1Tracked with low ground pressure dozer 2Tracked with 100 passes of fully loaded 45-ton truck TABLE 1 Combinations of materials tested 20 Geosynthetics | October November 2020 1020GS_p18-25.indd 20 9/22/20 12:51 AM