Title
Resolution to Ratify an Emergency Purchase Order to E.T. MacKenzie Co ($30,000.00), and to Appropriate Funds of ($72,000.00) for the Barton Dam Right Embankment Boil Repair. (8 Votes Required)
Memorandum
The attached resolution is to ratify an emergency purchase order, and to appropriate $72,000.00 to repair an embankment boil at the Barton Dam.
On August 27, 2018, the City observed a sand boil on the Barton Dam right embankment. A sand boil is caused by upward seepage that results in material loss an earthen embankment.
The City notified the Federal Energy Regulatory Commission (FERC) of this situation and has been monitoring daily since the discovery. Three additional boils have manifested themselves in the same vicinity. The flow of water from beneath the embankment has continued to transport sand material to the surface.
The City issued an emergency purchase order because FERC considers this condition to warrant prompt abatement. The purchase order contractor, E.T. MacKenzie Co., will install a blanket filter over the boil, which will allow water to flow through, but will retain the embankment material. This is a typical response and the City and E.T. MacKenzie Co. have used it in the past. E.T. MacKenzie was available to begin work immediately.
The City requires additional work from NTH Consultants, Ltd, a geotechnical consultant that has been monitoring the embankment at Barton Dam over the past year. That work, to design and establish the limits for the blanket filter, will be around $17,000.00, which exceeds the fund available on NTH Consultants, Ltd's existing professional services agreement ($234,800.00). This resolution therefore requests approval of Amendment No. 2 to that agreement to, among other things, raise its total to $251,800.00.
Finally, an additional $25,000.00 appropriation is requested for Stantec, which has been providing the daily monitoring of the boils and documenting the condition. Stantec will continue to provid...
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