Waldo County Technical Center :: Facility

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October 2000

Engineering Study performed by Harriman Associates

Based on the Fire Marshall's report and other issues relate to inside air quality, the Cooperative Board contracted with Harriman Associates to complete an engineering study of the facility. Harriman Associates were the architects for the original building construction.

The report submitted by Harriman Associates was basically that much of the existing equipment was installed during the original construction, had served its useful life. The boiler and hot water system were nearing the end of their useful life. Air handling and exhaust system in the hard trades areas were inadequate. The environment in the new classrooms constructed in 1997 was less than desirable. Several code violations were found in the Culinary Arts area related to exhaust hoods, water drainage, insufficient make up air for required hoods, no exhaust for dishwasher, and the lack of an external grease separator to protect septic fields. Water leakage from various sources into Health Science classroom. Existing trench drain in shops was no longer acceptable.

The following were the recommendations made by Harriman Associates in prioritized order:

1. New Classrooms Constructed in 1997
• Provide new air handling unit dedicated to new classrooms
• The existing HV-2 air handling unit does not have capacity to supply the 3000 cfm of air to the new classrooms as well as 7,200 cfm to the existing classroom areas.
• The new unit can be suspended from the roof structure or located on a mezzanine or a platform.
• Power, hot water, and controls would be extended to the new unit.
• New air handler shall be reconnected to the ductwork which currently serves these classrooms.
• A roof-mounted fresh air intake or wall intake louver shall be installed for fresh air and an exhaust relief to relieve the fresh air.
• Re-balance air to and from rooms for slight positive pressurization.

2. Food Technology
• Repipe drain from ice machine, sink, and new dishwasher.
• Provide air gap at ice machine drain connection.
• Pipe must have appropriate pitch. Preferable to cut small trench and tie into existing 4" sanitary line.

3. Existing HV-I - Existing hard trades air handling -unit
• Repair existing face and bypass dampers. \ • Remove existing acoustical lines, clean interior and reinsulate with external board insulation.
• Rebalance HV-I and distribution ductwork.
• Rebuild automatic temperature controls.
• Provide differential pressure control to modulate outside air quantity.

4. Rebalance hard trade exhaust fans
• Provide air flows at outlets as described in this report.
• (Optional) Provide variable speed drives for fans which would allow partial capacity operation.
• Rebuild controls.
• EF 8 & 9- Rebuilt blast gate dampers on exhaust duct connections, which allows tight shut-off. All connections need a blast gate.
• EF 10 - Carbon monoxide exhaust system - rebalance exhaust system to capacity identified in this report. - Restrict quantity of outlets utilized to match fan capacity. - Replace fan for higher capacity.
• EF-14 - Auto body - rebalance exhaust fan.. - clean interior of ductwork.

• Sawdust collection system. - Rebalance air flows and reduce open connections to provide velocity required for capture of dust and particulate. The alternative would be to replace the current cyclone exhaust fan unit.

5. Existing HV-2 - Existing classroom air handling unit
• Repair face and bypass dampers.
• Repair outside air damper.
• Remove acoustical liner, clean, reinsulate with external board insulation.
• Rebuild temperature controls.
• Rebalance HV-2 and distribution ductwork.

6. Existing AC-1 - Administrative offices air handling unit
• Start unit.
• Check and upgrade temperature controls.
• Add a hot water reheat coil to supply duct.
• Rebalance AC-1 and ductwork to original air quantities.
• Unit should run continuously during occupied hours.

7. External grease trap installation
• Install new external grease trap dedicated to food technology.

8. Health Classroom
• Rebuild and seal duct plenums connected to wall louvers.
• Insulate plenums and ductwork.
• Install motorized dampers at each louver for tight shut-off.

9. Existing Trench Drain • Option I - Fill with concrete - take out of service.
• Option 2 - Connect trench drain and sand/oil separator outfall to one or two double wall holding tanks, monitor tanks.

10. New Boilers • Replace existing boiler with two (2) new efficient boilers.

11. Replace HV-I and HV-2.

12. Upgrade automatic temperature building control system.

The estimated cost to by Harriman Associates to complete the above recommendations was $311,290. This amount did not address other issues in the Fire Marshall's report, or recommendations from TJM Consultants for bringing the kitchen up to code.

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This page was last updated: 5/15/2006 1:52:35 PM