Title
Resolution to Approve a Professional Services Agreement with NTH Consultants, Ltd. for the Barton Dam Right Embankment Remediation project (RFP 21-21) ($589,405.30)
Memorandum
This memorandum and resolution requests approval of a Professional Services Agreement with NTH Consultants, Ltd. (NTH) to provide professional services for the Barton Dam Right Embankment Remediation project for $589,405.30.
The Water Treatment Services Unit (WTSU) operates Barton Dam, which impounds the Huron River to supply approximately 80% of the City's drinking water. In addition, the dam generates electricity and the resulting pond provides recreational opportunities within the City park system. The dam is regulated by the Federal Energy Regulatory Commission (FERC) and is classified as a High hazard potential dam, meaning that an accidental uncontrolled release of water could result in loss of life and/or significant property damage.
The right embankment of the dam is a 1,500+ foot long x 23 foot high earthen structure that dates to the original construction of the dam in 1913. The embankment has a history of seepage, which is water migration through the earthen embankment, dating at least to the early 1970s. Several remediations have taken place on the embankment, including repairs in 1971, significant regrading in 1991 and installation of a reverse filter in 2013. In 2014, City installed additional monitoring equipment, and in 2017 the City commissioned NTH to perform a geotechnical study of the embankment which included taking earth samples from the embankment and testing them, installing more monitoring equipment, and performing sub-surface scanning of the embankment. The report recommended regrading the downstream slope and installing an improved seepage collection and drainage system.
The scope of this project includes professional engineering services for the detailed design and preparation of bid documents for the remediation of the Barton Embankment to i...
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