The Carlisle Mosquito Online

Friday, December 15, 2006


Costs rise for Carlisle School wastewater treatment facility

Carlisle School Business Manager, Heidi Zimmerman, told the Carlisle School Committee (CSC) at the December 6 meeting the costs for the Wastewater Treatment Facility (WWTF) were underestimated in the 2006-2007 budget. Buildings and Grounds Supervisor David Flannery explained the discrepancy in a memo to Zimmerman. "We have now had six months of full operation of the wastewater treatment plant. Included in this period there have been eight weeks of heating. From reviewing the history I have to date on the operating costs, there were not sufficient amounts included for electricity, propane heat, and telephone." The three largest discrepancies are the costs for electricity, heat, and telephone, he explained.

The WWTF must be heated, Zimmerman explained to the School Committee. "Propane is the heat source and there are two 1000 gallon propane tanks on site," Flannery explained further in an e-mail. The cost of heat was budgeted at $4,400, but Flannery estimates it will cost $11,000. The heat is needed to prevent condensation, Zimmerman explained to the CSC.

"All of the equipment at the plant is powered by electricity," Flannery later explained. "The RBC unit has a huge motor and there are several large pumps and fans that run 24 hours a day seven days a week." The revised cost is $12,000, which is a $7,500 increase over the budgeted $4,500.

The facility had a phone installed, which was not covered in the current budget. "The telephone is used for emergencies, transmitting data to the contract operator's office, faxing reports," Flannery said. It has the additional important role of transmitting monitored alarms, he added. Flannery said the phone would cost $900. "Expensive phone," said CSC Chair Nicole Burkel.

The other increase is $1,900 for the "Contract Operator," from $55,100 to $57,000. The contract operator is Weston and Sampson, and the costs break down as: operation and maintenance, engineering oversight of WWTF with reports, $40,000; outside laboratory costs, $3,900; maintenance and repair allowance, $5,700, sludge hauling and disposal up to 16,000 gallons per year, $2,500; chemical allowance, $3,000.

2006 The Carlisle Mosquito