The intent of this credit is to provide capacity for indoor air quality (IAQ) monitoring to help sustain long-term occupant comfort and well being. Our building is a 38 story multi-family rental property that has minimal assembly spaces and 597 apartments that are heated and cooled with a heat pump system. Outside air is supplied through operable windows (required by code) and trickle vents. We are proposing a similar but more practical and economical approach to achieve the equivalency approved in the CIR dated 1/18/2002. It will include the following: 1. CO2 monitors will be installed in the breathing zone of any spaces that may be densely occupied. In this residential high-rise, these spaces include the health club and lounge areas. The CO2 monitors in the health club and lounge will be wired to the Building Management System (BMS), alerting staff to manually remediate the situation upon alarm. They will be able to check to make sure that the outside air intakes are operating properly and if not, open dampers and remove any blockages. The rental apartments make up most of the remaining square footage and will have very low occupant densities; therefore, elevated CO2 levels are unlikely to be a problem. 2. CO monitors will be installed near base building combustion equipment such as boilers, microturbines, and gas-fired domestic water heaters. These CO monitors will be tied into the BMS, which will notify building staff on duty to investigate, detect, and terminate the source of the excess CO. In addition, CO alarms will be installed in the garage, where the space will automatically vent if CO exceeds acceptable levels. Additional permanently wired and alarmed CO monitors will be placed in apartments to alert tenants to a problem. 3. Periodic IAQ monitoring shall be performed once a year. Air samples shall be collected for every 20,000 sq. feet. Sampling for CO, CO2, TVOCs and formaldehyde shall be performed using state-of-the-art, direct reading instrumentation that allows accurate and precise analytical data reported at a parts per million (ppm) to parts per billion (ppb) level. Sampling for airborne particulates will be accomplished using a direct reading instrument which complies with US 21 CFR 1040.10. This instrument has a built-in high quality laser-diode based optical laser using light scatter technology to detect, size and count particles. Temperature and relative humidity will be measured using a hand held hygrometer that provides a digital readout of both temperature and relative humidity. The standards and levels that we propose are as follows: Carbon dioxide: ASHRAE 62-2001: < Outside air level + 700 ppm. Carbon monoxide: NAAQS 8 hr: 9 ppm TVOCs: State of Washington Program and IAQ Standards: < 5 mg/m3. Formaldehyde: State of Washington Program and IAQ Standards: < 5 mg/m3. Airborne Particulates: OSHA PEL: < 5 mg/m3 Temperature/Relative Humidity: ASHRAE 55-1992 Thermal Comfort Standards. Utilizing this type of instrumentation allows for the collection of substantial data in "real time" for a relatively low cost. The spectrophotometric system has additional advantages including its durability, flexibility, accuracy, calibration ease, instantaneous results, data retention and downloading capacity. Will LEED accept this alternative approach to achieving the intent of this credit -- providing indoor air quality monitoring to help sustain long-term occupant comfort and well being?
The CO2 monitoring discussed in this inquiry adequately addresses the intent of this credit for the occupancy use described. The measurement of items listed, while excellent for managing quality IAQ, are not a mandatory requirement for achieving this credit.
Related Addenda (Corrections & Interpretations)