caa a22 4500 467931062 CHVBK 20180406152943.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10706-005-6840-x doi (NATIONALLICENCE)springer-10.1007/s10706-005-6840-x Nichol Douglas Wrexham County Borough Council, Crown Buildings, P.O. Box 1293, LL11 1WQ, Wrexham aut Geo-engineering problems at Llwyneinion hazardous waste site near Rhosllanerchrugog, North Wales [Elektronische Daten] [Douglas Nichol] At Llwyneinion, a clay pit excavated in Carboniferous Bettisfield Formation was utilised for hazardous waste disposal prior to 1972. Approximately 94,000t of acidic asphaltic sludges and pitches was poured directly into the pit together with 7500t of spent bentonite containing absorbed oil. Numerous chemical drums were also dumped in the sludge. The unlined acidic asphaltic sludge and pitch lagoon occupies 1.3ha, ranges up to 10m deep and is underlain by fissured strata and extensive mineworkings including three shafts. The heterogeneous asphalt waste has developed a semi-solid asphalt layer at the base but mostly remains in a viscous and mobile condition. A surface layer of rainwater less than 0.4m deep covers the waste. Surprisingly, detailed hydrogeological studies of the area surrounding the acidic asphaltic sludge and pitch lagoon failed to disclose any significant contamination of aquifers, however regular monitoring of water conditions is performed as a safeguarding measure. Various remediation strategies have been assessed and rejected. They fall into two main categories; those involving on site treatment of the acidic asphaltic sludges and pitches and encapsulation and those aimed at removal of the material to facilities elsewhere in the country. Investigations and deliberations continue in order to determine the optimum way forward. Springer, 2006 Geotechnical & Geological Engineering Kluwer Academic Publishers 24/4(2006-08-01), 809-818 0960-3182 24:4<809 2006 24 10706 https://doi.org/10.1007/s10706-005-6840-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-6840-x text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Nichol Douglas Wrexham County Borough Council, Crown Buildings, P.O. Box 1293, LL11 1WQ, Wrexham aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/4(2006-08-01), 809-818 0960-3182 24:4<809 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer