The Construction Manager, Ledcor Construction Ltd., the Mechanical Trade Contractor, Fred Welsh Ltd., related and Finishing Trades propose the following Construction IAQ Management Plan for the University of British Columbia Life Sciences Centre. At a later date we will provide photographs of measures to implement the plan and cut sheets of filtration media used. Please confirm that the plan meets or exceeds the requirements of LEED Indoor Environmental Quality Credit 3.1. PROJECT SUMMARY: The Life Sciences Centre is a new 550,000 square feet medical education and research facility for the University of British Columbia, Canada. The mechanical systems are divided into four basic groups: (a) a centralized vivarium, a morgue, and an anatomy laboratory in the two Basements; (b) a public Ground Floor dedicated to teaching theaters, demonstration & seminar rooms, administration and support; (c) four stories of experimental and research laboratories in three wings on the Typical Floors, and (d) Two Atria separating the laboratory wings and connected to the Ground Floor. These Atria have separate air supply systems and can be 100% exhausted at the Roof level. The nature of the laboratory functions and the related high ventilation requirements result in nearly all areas within the facility being 100% exhausted. The Administration offices, the theater-classrooms, and other areas of the Ground Floor are designed more conventionally with a return air component. To segregate the air supply, all the mechanical (and electrical) supply equipment is located in the Basements and all the exhaust equipment is positioned on the Roof, minimizing the possibility of cross contamination. This mechanical segregation of the functioning areas greatly assists the Indoor Air Quality strategy. For emphasis it is worth repeating - all laboratory floors and technical support areas are 100% exhausted; only the Ground Floor functions having re-circulating return air. Strategies for operational economies and heat recovery are discussed elsewhere in the LEED submission. The occupancy of the entire facility will be phased. The Basement areas, the Ground Floor, the Upper Stories, and the Atria can be progressively brought on-line with their own isolated HVAC systems a story-by-story and a wing-by-wing basis without any of that air being returned or being mixed with occupied areas. The Ground Floor and upper stories can be flushed using operating windows and positive pressure. With this simplified summary in mind, the following Indoor Air Strategies will be discussed: 1. HVAC PROTECTION: - During construction, the two very large supply air intake manifolds at grade will be protected from construction dust & debris. Each of the many HVAC air intakes off those manifolds will be blanked. When run for tests and balancing, the perimeter areas will have been hard landscaped and the air intakes will be filtered and those filters replaced following pre-occupancy flush. - As mentioned in the Summary, the typical Laboratory Floors, the Atria, and the Basement areas will receive 100% outside air and can be segregated easily, flushed, and occupied floor-by-floor and/or wing-by-wing without cross contamination. Should the HVAC systems for those floors be used during construction for temporary heat or ventilation, the exhaust air system openings will be sealed off to prevent the accumulation of dust and debris in that exhaust duct system. The diffusers will be sealed in plastic. - The Ground Floor, being the only building area with a return air system, will have all return air openings blocked. If, for some unforeseen reason, there should arise a circumstance wherein the return air system is required, it will have temporary MERV 13 filters installed at each return air opening and will receive frequent inspection & maintenance. The temporary filters would be replaced for the final flush. If inspections by the mechanical engineer discover that the return air ducts have become contaminated due to inadequate protection, the return air ducts will be cleaned professionally as specified. - Two distinct layers of the building are designed to different standards. The Ground Floor and the upper Laboratory Floors are specified to meet SMACNA Duct Cleanliness Guidelines "Intermediate Level" standards. More sensitive areas in the lower Basement are specified to meet SMACNA Duct Cleanliness Guidelines "Advanced Level" standards. To reiterate, with the exception of the Ground Floor mentioned previously, none of the upper or lower stories have any return air components. - The Basement mechanical rooms will not be used to store construction or waste materials and will be kept clean and neat. - When activities that produce high dust or pollution levels occur, such as drywall sanding, concrete cutting, masonry work, wood sawing, and insulating, return and supply air system openings will be sealed off completely for the duration of the task. To avoid potential contamination of the ceiling tiles which form return air plenums, lay-in tile installation will be delayed until after the drywall, paint and floor finishing is completed. - Pictures of typical methods and procedures will be taken periodically by the Mechanical Trade Contractor and submitted to the Construction Manager in addition to the photographs required under the monitoring section of this plan. 2. SOURCE CONTROL: - Prefabricated insulated ductwork will be protected against moisture during delivery to the job site. Ductwork materials will be stored inside the structure in a dry and clean environment pending installation. - Construction traffic volume will be limited in the vicinity of the air intake manifolds by the time the main HVAC systems are activated. The manifold plenum will be protected and then cleaned and the HVAC units' manifold plenum filters will be protected and replaced as specified following the flush. Motor vehicles will be restricted to the Loading areas, well removed from any fresh air intakes, preventing emissions being drawn into the building. - Electric or natural gas alternatives for gasoline and diesel equipment will be used where possible and practical. Equipment will be cycled off when not being used or needed. - The specification of materials and products with high VOC and/or particulate levels will be avoided. Careful attention will be paid to choosing products or installation methods with low VOCs such as paints, sealers, insulation, adhesives, caulking and cleaners and to choosing materials that do not breakdown. To further reduce potential exposure during construction, isolation procedures and ventilation with 100% outside air will be used to exhaust contaminated air directly outside during the installation of VOC emitting materials. - A broad range of related air quality design standards within the building following Occupancy are discussed elsewhere in the LEED Submission. For example, EQ Prerequisite 1 for IAQ performance compliance with ASHRAE 62-1999 and EQ Credits 1 and 7 for CO2, temperature, humidity, and air movement are all presented by the Mechanical Engineer. EQ Prerequisite 2 for tobacco and related particulates is achieved by the University of British Columbia's strict Smoke Free Buildings Policy. - During construction, a full time Safety Officer will enforce Ledcor's Health, Safety & Environmental Program which includes an Exposure Control Program section, governed by the Workman Compensation Board's Occupational Health & Safety Regulation 296/97 as amended by Regulation 185/99 and specifically Part 5: Chemical & Biological Substances and Part 6: Substance Specific Requirements. The Safety Officer or his/her designate will wear a gas sampler and/or a particulate sampler during their constant rounds. On a weekly basis, a certified laboratory will test the samplers' canisters. Results will be monitored and recorded. Any non-complying results will be flagged and corrective measures implemented. The following outlines the material source standards being proposed during construction by type and limit of pollutants (for concentrations all averaging times are 8 hours): Respirable Particulates: 150 micrograms/m
LEED points are not awarded or guaranteed through the CIR process; the project will need to successfully demonstrate achievement in the LEED application to achieve this credit. Having stated this, the plan as it is described meets the credit requirements. If the plan is adhered to during construction and is properly documented for LEED, the team should be successful in achieving this credit. One minor note, SMACNA IAQ Guidelines lists Appendix C as the Planning Checklists and Appendix D as the Inspection Checklists. Applicable Internationally.
Related Addenda (Corrections & Interpretations)