A cover system is provided for waste sites and environmental closures, in which the cover system comprises a synthetic grass and an impermeable geomembrane that can be applied without the use of heavy earthwork equipment as temporary or final cover to control odors, erosion, gas migration and contaminate migration. The functional filler of the present invention is characterized in including a raw material filler and polylactic acid, wherein a surface or end the raw material filler is modified by the polylactic acid. The independent fixation coupling construct also provides for fixation of the angular orientation of the coupling construct while the coupling construct has received the spinal rod. At the time of making a bond between the base members, the coating layer of Au 53 and the solder layer 54 are diffused to each other, resulting in formation of a bond layer of alloy 55 containing at least 91 wt % of Au and at most 9 wt % of Sn.