| http://www.w3.org/ns/prov#value | - Cylindrical tubes will suffice, but it may be advantageous to utilize tubes with a triangular, oval, or other cross section which fosters movement of tubes 136,136' through the material of the aquifer 14. (Sharp edges may also be installed on the exterior of a cylindrical tube for the same reason.) Radial injection tubes 136,136' may have openings at their distal ends, or along their lengths, or b
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