Answer Happy

1. The cap system at a landfill consists of the following layers (from top to bottom): ● 6 inches of topsoil 18 inches of select fill soil Geotextile cushion Geonet drainage layer 40-mil LLDPE geomembrane 12 inches of geomembrane base layer soil a. A recent survey was completed, and a comparison of the contours indicates settlement has occurred over time. The diameter of the strain in two locations is 25 and 100 feet, respectively. The difference in contour elevations (i.e., settlement) in these two locations ranges between 0.5 to 3 feet. The concern is the potential for the geomembrane to have strained past an acceptable limit. Assume the maximum allowable strain is 10%. i. Calculate the amount of strain for each location for the range of settlement identified and determine if it is within an acceptable limit. ii. Calculate the maximum amount of settlement for each location allowable at the maximum allowable strain limit.