Commission makes decisions about dam repairs

MarionCounty

The Marion County Board of Directors met on Monday, Sept. 27 for their weekly meeting and heard from Marion County Park and Lake Superintendent Isaac Hett regarding the estimates for the dam repairs.

Sustainable Environmental Consultants (SEC) came out and did three estimates.

The estimate from SEC stated that “the as-built construction of the Marion County Lake Dam presents construction challenges.” This is due to the stone pillars and steep back slope which will require extra construction attention and increased construction difficulty. This means that the construction cost could be increased to address these historical and safety concerns.

According to the estimate, all three estimates were based on the assumptions that the stone pillars would remain in place and would not be disturbed or damaged during construction activities and that if the stone pillars are damaged, the cost to rebuild is not included in this estimate.

There were three estimates: Minimum, Medium and Maximum.

The Minimum Repair estimate would involved excavating and reshaping the ten eroded areas to remove the irregular shape and concentrated ditches, lining the reshaped areas with geotextile, and backfilling with rock.. Next, excavating the sediment and removing undesirable vegetation from the downstream slope, diversion channel (entire length of the dam). Reshape the diversion channel and berm to meet or exceed the design dimension and elevation on the original blueprint plans. The total estimate would be $83,900.

The Medium Repair estimate would entail the need to excavate a linear cutoff trench along the top edge of the downstream slope for the entire length of the dam, line the trench with geotextile, backfill the trench with rock. Reshape the downstream slope (above the diversion) to as-built elevation and dimension. Excavate the sediment and remove undesirable vegetation from the downstream slope, diversion channel (entire length of the dam). Reshape the diversion channel and berm to meet or exceed the design dimension and elevation on the original blueprint plans. Remove the existing diversion CMP pipe outlets at the left and right abutments. Replace with the same size PVC pipe. The pipe inlet and outlet elevations should match current conditions or the original blueprint plans. Reseed the downstream slope between the newly placed trench rock and existing diversion rock and the reshaped diversion. The total estimate cost would be $142,450.

The Maximum Repair estimate would involve a plan to reshape the downstream slope (above the diversion) to as-built elevation and dimension. Excavate the sediment and remove undesirable vegetation from the downstream slope, diversion channel (entire length of the dam). Reshape the diversion channel and berm to meet or exceed the design dimension and elevation on the original blueprint plan. Remove the existing diversion CMP pipe outlets at the left and right abutments. Replace with the same size PVC pipe. The pipe inlet and outlet elevations should match current conditions or the original blueprint plans. Line the downstream slope (above the diversion) with Flexamat erosion control matting. The total estimate would be $404,000.

“They would like to get something going as soon as possible so they could submit the plans to the state and then get the approval which can take 6-8 months,” said Hett.

After much discussion, the board voted unanimously to go with the Minimum Repair estimate realizing that more issues may arise as work begins and there may be a need for more funds.

Hett told the board that he spoke with the city of Florence about using them for another year for trash services and was informed that there would be an increase in charges. The rate will now be $849.90 for one a week pickup for the peak season which is April through October. The cost for the off season pickup is twice a month from November through March and be will $141.65 per month.

The contract is due on Oct. 1 so the decision was made to move forward with it, but the plan is to look for better rates for the following year.

Hett reminded the board about the upcoming Chili Cook-off this weekend on Oct. 2. He is anticipating a good turnout.

In other business, the board:

n heard updates on various road projects by County Engineer Brice Goebel

n learned from Goebel that he is losing another driver and he is frustrated at being down so many drivers. Goebel said he is already down three drivers and now will be down four next month.

“I’m a little concerned about snow removal this winter with no drivers,” said Goebel. “I talked with KDOT and they were saying they could only fill like 30 trucks out of 90 on one of their shifts. It’s not just us having a problem.”

n met in two executive sessions to discuss the health department director position

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