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Sinkhole Remediation and Geomembrane Lining of RCC Reservoir No. 1.
Rifle Correctional Center (RCC) Reservoir No. 1 is classified by the Colorado State Engineer's Office (SEO) as a Minor Size Low Hazard Dam. The dam is located on the western slope approximately ten miles north of the town of Rifle, CO. The reservoir was originally constructed in 1997 by excavating into the natural hillside on the eastern and northern side of the reservoir. The excavated soils were used to construct a non-zoned homogeneous earthen dam embankment on the western and southern sides of the reservoir. The reservoir impounds approximately 4.2 ha-m (34 acre-feet) of water used to augment Middle Rifle Creek and provide fire suppression water for the Rifle Correctional Center. Upon initial filling unacceptable seepage out of the reservoir was observed. In 1998 soils in the cut areas of the reservoir were amended by mixing dry bentonite with the native soils in an attempt to reduce seepage. During normal reservoir operation desiccation cracking of the soils developed and the seepage was not reduced to an acceptable level. In 2006 a sinkhole was observed in the northern portion of the reservoir during a routine SEO dam inspection and a zero storage restriction was placed on the reservoir. Geotechnical investigations determined that the dam and reservoir are founded on an alluvial fan deposit that is locally blanketed with coarse colluvial soils in the area of the sinkhole. Remediation of the sinkhole required the design and construction of a two stage soil filter. Due to the history of unacceptable seepage out of the reservoir a geomembrane liner system was designed and installed to reduce the reservoir seepage losses to an acceptable level for normal operation of the reservoir. The chosen lining material was a 1.5 mm (60 mil) Hypalon geomembrane liner underlain with a 0.45 kg (16 oz) geotextile fabric. The construction was completed in September of 2007. The reservoir is expected to be filled and return to normal operation for the 2008 water year.
Sinkhole Remediation and Geomembrane Lining of RCC Reservoir No. 1.
Rifle Correctional Center (RCC) Reservoir No. 1 is classified by the Colorado State Engineer's Office (SEO) as a Minor Size Low Hazard Dam. The dam is located on the western slope approximately ten miles north of the town of Rifle, CO. The reservoir was originally constructed in 1997 by excavating into the natural hillside on the eastern and northern side of the reservoir. The excavated soils were used to construct a non-zoned homogeneous earthen dam embankment on the western and southern sides of the reservoir. The reservoir impounds approximately 4.2 ha-m (34 acre-feet) of water used to augment Middle Rifle Creek and provide fire suppression water for the Rifle Correctional Center. Upon initial filling unacceptable seepage out of the reservoir was observed. In 1998 soils in the cut areas of the reservoir were amended by mixing dry bentonite with the native soils in an attempt to reduce seepage. During normal reservoir operation desiccation cracking of the soils developed and the seepage was not reduced to an acceptable level. In 2006 a sinkhole was observed in the northern portion of the reservoir during a routine SEO dam inspection and a zero storage restriction was placed on the reservoir. Geotechnical investigations determined that the dam and reservoir are founded on an alluvial fan deposit that is locally blanketed with coarse colluvial soils in the area of the sinkhole. Remediation of the sinkhole required the design and construction of a two stage soil filter. Due to the history of unacceptable seepage out of the reservoir a geomembrane liner system was designed and installed to reduce the reservoir seepage losses to an acceptable level for normal operation of the reservoir. The chosen lining material was a 1.5 mm (60 mil) Hypalon geomembrane liner underlain with a 0.45 kg (16 oz) geotextile fabric. The construction was completed in September of 2007. The reservoir is expected to be filled and return to normal operation for the 2008 water year.
Sinkhole Remediation and Geomembrane Lining of RCC Reservoir No. 1.
Foster, Derek H. (author) / Spitzer, Roy (author) / Hayden, Colby J. (author)
Biennial Geotechnical Conference 2008 ; 2008 ; Denver, Colorado, United States
GEO-Velopment ; 53-65
2008-10-28
Conference paper
Electronic Resource
English
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