The project is a training complex in Oklahoma. The new facilities consist of two new B/COF buildings. We intend to conduct baseline IAQ testing, as outlined in option 2. We would like clarification in determining the number of sampling locations within the buildings. The two B/COF buildings each have three floors and encompass approximately 93,000 square feet. For these two buildings, three Dedicated Outside Air Systems (DOAUs) distribute outside air throughout each B/COF building; however, separate Water Source Heat Pumps (WHPs) condition the outside air delivered to each room. Each B/COF building contains 150 residential barracks units which each have a separate WHP. In addition, each B/COF building has identical rooms whose HVAC needs are provided by identical WHP units (e.g., identical offices, identical lounges, and identical learning centers). Following the guidance provided by the LEED for New Construction Version 2009 Reference Guide, each B/COF building would require 184 sampling locations. We propose the following alternative compliance path for multi-family, residential projects with similar rooms and residential units: Per the guidance provided by LI 1740 dated 05/30/2007 , If the delivery of outside air on an air change per hour basis and the materials in a ventilation zone are identical (e.g. a specific type of hotel room, or apartment/condominium with separate ventilation systems) a HERS random sampling plan may be employed (i.e. random 1 in 7 selection from each model of room). In addition, for buildings with large numbers of identical rooms each with separate ventilation systems, a minimum of 3 rooms for a particular model of room shall be deemed sufficient. If one or more of the three measurements made per model room fail, then an additional three of that type guest room are tested. All failed rooms will be re-tested following flushing with outside air. Furthermore, per the guidance provided by LI 5209 dated 04/21/2009, an acceptable strategy for each individual unit type configuration, is a minimum of 3 samples are taken for each identical unit type. (Note: In this case, the minimum of 3 samples refers to three Indoor Air Quality (IAQ) sampling locations for each similar unit type.) Implementing the minimum of three (3) rooms for a particular model of room, we estimate that a total of twenty-seven (27) sample sets will be required in each B/COF building. Per this methodology, identical Dwelling Units will be grouped together and a minimum of 3 sampling locations will be included in the Indoor Air Quality Testing. In the same manner, similar room types with identical ventilation units and rates (i.e. computer learning rooms) will form a separate group upon which a minimum 3 sampling locations will be included. As stated above, this methodology is based on the LI 1740 dated 5/30/2007 for LEED NCv2.2 and LI 5209 dated 04/21/2009. For this project, all Dwelling Units are identical. In each B/COF building, 6 WHP\'s serve 6 identical Dwelling Units and the corridors on the Northeast and Northwest corners of each floor. Although corridors are not considered occupied space per ASHRAE 62.1-2007, the delivery of outside air on an air change per hour basis and the materials in these ventilation zones differ from the remaining Dwelling Units. Per this methodology, these 6 Dwelling Units will be grouped together and 3 sampling locations will be included in the Indoor Air Quality Testing. The remaining 144 identical Dwelling Units are served by separate identical WHP\'s and 3 sampling locations will be included. The remaining groups are served by identical WHP\'s per group, and thus will include 3 samples each for the identical Drill Instructor Rooms (1 per floor), identical Laundry/Vending Rooms (1 per floor), identical Day Rooms (1 per floor), and identical Computer Learning Rooms (1 per floor) for a total of 12 sampling locations. For zones without identical rooms each served with separate ventilation systems, the original guidance will be followed, and the number of sampling locations for each separate ventilation system will not be less than 1 per 25,000 square feet or for each contiguous floor area, whichever is larger. Thus, an additional 9 sampling locations will be included. Please confirm if this alternative compliance path meets the credit intent. If this is not acceptable, please clarify how the IAQ testing option may be applied to projects with identical residential units or rooms that have separate ventilation units but equal ventilation rates based on air changes per hour and identical materials within each unit or room.