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Appendix D https://www.pca.state.mn.us • 651-296-6300 • 800-657-3864 • Use your preferred relay service • Available in alternative formats c-rem3-01a • 1/13/21 Page 3 of 8 5. Heating, venting, air conditioning, or other building controls (Check all that apply) Type of heating system(s) used in this building (Check all that apply) Hot air circulation Space heaters Electric baseboard In-floor heating Heat pump Steam radiation Wood stove Hot water baseboard Radiant floor Outdoor wood boiler Other (specify): Primary type: Forced air Primary type of fuel used (Check appropriate response) Natural gas Fuel oil Kerosene Electric Propane Solar Wood Coal If hot water tank present, indicate fuel source: Natural gas Boiler/furnace is located in: Basement Outdoors Main floor Other: Type of air conditioning: Central air Window units Open windows No mechanical system Is outside replacement (make-up) air provided for combustion appliances? Yes No If no, explain: Are there air distribution ducts present? Yes No Describe the supply and cold air return ductwork and its condition where visible, including whether there is a cold air retur n and the tightness of duct joints. Indicate the locations on the floor plan diagram: Each floor has its own supply and cold air return ductwork located within finished ceilings, grills are visible in ceiling spaces. Describe the type of mechanical ventilation systems used within or for the building (e.g., air-to-air exchangers, HVAC, etc.). Indicate whether the interior spaces of the building use separate ventilation systems and/or controls. Provide information on any existing building mitigation system (e.g., radon mitigation, passive venting systems, etc.). If available, provide information on air exchange rates for any existing mechanical ventilation systems currently in use. The building has multiple rooftop heating/cooling units. There are no existing building mitigation systems. Air exchange rates were not made available. 6. Summary of potential building vapor intrusion entry points Earthen floors or incompetent floor slabs in the lowest level of building? Yes No Sumps (unsealed)? Yes No Large utility penetrations through floor and/or walls with exposure to sub-surface soils? Yes No Crawl spaces with earthen floors or incompetent floor conditions? Yes No Other (describe below) Yes No The room in the northwestern portion of the basement has an unfinished floor with approximately 1/8th" sized holes in the unfinished concrete flooring. 82