Sample Questions

Geosynthetic Materials and Compacted Clay Liners




GT-1 Geotextiles are usually joined in the field by:


A.   Overlapping

B.    Sewing

C.   Heat bonding

D.   All of the above

E.    None of the above


GT-2 When installed on a slope, a geotextile should always be:


A.   lapped with the downstream edge over the upstream edge

B.    placed adjacent to each other with no overlap

C.   overlapped six inches and sewn

D.   be constructed so that no joints ever occur



GM-1 The primary reason extrusion fillet welding of polyolefin geomembranes requires surface grinding of the sheets is:


A.   for convenience of the welders

B.    the edges are usually too thick

C.   for added material strength

D.   to remove surface oxidation


GM-2 Why are trial test strips important in the installation of a geomembrane?


A.   to satisfy regulations requirements

B.    to test the seamers abilities

C.   to verify that the equipment is working properly and the workmanship is acceptable

D.   to generate friction with the liner contractor



GCL-1 Adjacent rolls of GCLs are jointed by what method?


A.   sewing

B.    stapling

C.   mechanical connection

D.   welding

E.   overlapping


GCL-2 When a GCL has a nonwoven needle punched geotextile on one surface and a woven slit film geotextile on the other surface:


A.   placement of which surface is up does not matter

B.    the nonwoven geotextile side should always be up

C.   the woven geotextile side should always be up

D.   the site-specific plans must provide guidance



CCL-1 The zero air voids curve is also known as:


A.   maximum density curve

B.   100% saturation curve

C.   100% relative compaction curve

D.   95% relative compaction curve


CCL-2 Fines are defined as:


A.   fraction of soil passing through the opening of a 100 sieve (150 mm)

B.   fraction of soil passing though the openings of No. 200 sieve (75 mm)

C.   loamy fraction of a soil

D.   clay fraction of a soil

E.    percent retained on a No. 200 (75 mm) sieve but passing a No. 140 sieve (106 mm)