Stormwater Basin Liner
Stormwater Basin Liner
(OP)
Working on a commercial site in northwestern PA that is located in a well head protection area. The local municipality would like the stormwater basin to be lined to prevent water from seeping into the groundwater.
Any suggestions on what type of lining system would be most appropriate for this situation (HDPE, PVC, Geosynthetic or any others). Also, any budgetary costs for these systems.
Any suggestions on what type of lining system would be most appropriate for this situation (HDPE, PVC, Geosynthetic or any others). Also, any budgetary costs for these systems.
RE: Stormwater Basin Liner
RE: Stormwater Basin Liner
As Terry stated, something utilizing benetonite might be more affordable. Whether it be a mat type system or you just incorporate bagged material into the top 9"=12" of soil within the basin. If you use benetonite or other soil type liners, you will need to keep it moist by covering it with an adequate depth of other soils or maintain water in the basin. If it dries and cracks the liner is useless.
What kind of soils do you have in the area? If they are fat clays, they can be hauled in or used in place for the liner. May check the permeability of the existing soils to determine if a liner is even needed.
RE: Stormwater Basin Liner
Three stipulations: if you have USC soils CH, CL OR MH, ML available, and the client is willing to lab certify your specified compaction and w, and if the reviewer is willing to accept your specifications (three big ifs, I know).
RE: Stormwater Basin Liner
RE: Stormwater Basin Liner
The use of native soils or the addition benotimite are good ideas, but I think the local well head protection committee would feel more comfortable if they saw a physical barrier as opposed to just soil.