first application was for draining ground water causing slope instability, the present applications are confined to the extraction of contaminated groundwater or decomposition gases such as methane. In situ bioremediation can also use polymer slurry trenched drains for extraction and reinjection of treatment fluids. A new application consists in combining conventional slurry trenched barrier with polymer slurry trenched drain segments filled with reactive particulates to channel contaminated ground water through these "gates" and provide in situ treatment "on the run".
Typically, trenching under slurry causes some soil particles to become suspended. In traditional thixotropic clay slurries, most of the fines remain suspended when the slurry comes at rest. On the contrary, for almost all polymer slurries used in the trenching process, fines are only temporarily in suspension while theA new species of Ituglanis Costa Bockmann, 1993 (Siluriformes: Trichomycteridae) from Rio Ribeira de Iguape and upper Rio Tietê basins, southeastern Brazil.
Ituglanis amphipotamus, new species, is distinguished from all congeners by the combination of the following characters: anterior cranial fontanel present, i,5 pectoral-fin rays, nasal canal and antorbital segment of infraorbital canal absent, five or six pairs of ribs, 39 post-Weberian vertebrae. It can be further distinguished from the sympatric I. proops by the size of the interopercular patch of odontodes. The new species is described from the Rio Ribeira de Iguape and the upper Rio Tietê basins in the southeastern region of Brazil. Comments on the biogeography of the new taxa and putative relationships with its congeners are presented. [Zoobank: urn:lsid:zoobank.org:act:AC2F3365-92C0-4444-AC89-9546365158EC].