For LEED Indoor Environmental Quality Credit concerning Interior Lighting, Option 1, the requirement is for 90% of building occupants to have individual lighting controls. Given that the tenant space includes 100 workstations and 10 enclosed offices intended for individual use, this means that a total of 110 workspaces require lighting control. To achieve one point, at least 90% of these occupants must have control over the lighting in their space. Therefore, the minimum number of occupants that would need individual lighting controls is 90% of 110, which calculates to 99 occupants (rounded down). However, as individual controls cannot be split between occupants, the actual minimum number would be 99 occupants. Option B is the closest answer to 99 without going under the required percentage.

References: Explanation of the requirements for individual lighting controls to meet the Interior Lighting Credit under Indoor Environmental Quality, indicating that 90% of building occupants must have task lighting .

The costs considered for Building Product Disclosure and Optimization (BPDO) cost-based credits should reflect the actual costs of the materials used in the project. Furniture is considered optional for these calculations. This approach allows for flexibility in reporting and aligns with the intent of the BPDO credits to encourage the use of sustainable materials.

References : The information is based on the guidelines provided by the U.S.  Green Building Council for LEED v4 ID+C MR Credits Building Product Disclosure and Optimization 1 2 3 4 .

The LEED Location and Transportation Credit for Reduced Parking Footprint is aimed at projects that can demonstrate a reduction in parking capacity. For a performing arts center, this would involve showing a 20% reduction in the number of parking spaces compared to the base ratio typically required for such a facility. This encourages the use of alternative transportation and reduces the environmental impact of excessive parking space.

References : The LEED v4.1 Reference Guide for Interior Design and Construction outlines the requirements for the Reduced Parking Footprint credit, which includes strategies like reducing parking capacity to minimize the project’s impact on the environment 1 .

The Water Efficiency Prerequisite for Indoor Water Use Reduction in LEED AP ID+C V4 focuses on reducing the aggregate indoor water consumption by 20 percent from the baseline. This includes water usage by appliances such as residential clothes washers and dishwashers, which are common contributors to indoor water use.

References : The LEED v4 Indoor Water Use Reduction Calculator provides guidance on the baseline water consumption for various fittings and fixtures, including residential appliances 1 .  Additionally, the LEED v4: Interior Design + Construction Guide outlines the requirements for achieving the prerequisite, emphasizing the reduction of indoor water use through efficient appliances 2 .

In the Water Efficiency Prerequisite for Indoor Water Use Reduction, the focus is on reducing potable water usage through efficient fixtures and appliances. The eligible appliances that fall under this prerequisite are residential clothes washers and dishwashers, as they are commonly used appliances within buildings and contribute to indoor water use. These appliances must meet certain efficiency standards, such as being ENERGY STAR certified or equivalent, which ensure they use less water than conventional models.

References: Specification of appliances under the Water Efficiency Prerequisite for Indoor Water Use Reduction, which includes standards and requirements for residential clothes washers and dishwashers, among other appliances .

According to the LEED AP ID+C reference guide, for the purpose of achieving the Indoor Environmental Quality Credit under Enhanced IAQ Strategies, CO2 monitoring should be implemented in all densely occupied spaces 1 . The public areas of a hotel, including the front desk, lobby, restrooms, and corridor, are typically not considered densely occupied spaces. Therefore, a single CO2 monitor in a central location like the lobby could suffice for the entire public area to meet the requirements of the credit.

References :

LEED v4: Interior Design + Construction Guide 1 .

Enhanced Indoor Air Quality Strategies, LEEDuser 1 .

The visible light transmittance of the existing exterior glazing affects the amount of natural light that penetrates the space, which is directly related to the Indoor Environmental Quality Credit for Daylight. This credit assesses the daylighting conditions in occupied spaces to promote occupants’ comfort and well-being.  Since no modifications to the building envelope are being made, the existing glazing’s light transmittance will influence the daylight credit’s performance 1 .

References :

LEED v4 Reference Guide for Interior Design and Construction, specifically the section on Indoor Environmental Quality Credit: Daylight 1 .

Wood derived fuel contributes toward the Materials and Resources Credit, Construction and Demolition Waste Management, as it is considered a form of waste diversion.  Diverting wood waste to be used as fuel is a recognized strategy for reducing the amount of waste sent to landfills and incinerators, aligning with the goals of sustainable waste management practices outlined in LEED 1 .

References :

LEED v4 for Interior Design and Construction Reference Guide 2 .

LEED Credit Library - Materials and Resources 3 .

Canada Green Building Council’s insight on Construction and Demolition Waste Management 1 .

Pre-consumer recycled content refers to materials that have been diverted from the waste stream during the manufacturing process but have not yet been used by a consumer. Sawdust from a lumber mill, which is used to make composite board, is an example of pre-consumer recycled content because it is a by-product of the manufacturing process that is being repurposed into a new product.

References : The LEED v4 reference guide for Interior Design and Construction defines pre-consumer recycled content as material diverted from the waste stream during a manufacturing process.  This excludes materials that can be reclaimed within the same process they are created in 1 .  Sawdust from a lumber mill is a waste by-product that is often repurposed into new products like composite board, making it a valid example of pre-consumer recycled content 2 .

The use of MERV 13 (F7) air filters is specifically required for the Indoor Environmental Quality Credit, Enhanced Indoor Air Quality Strategies.  This requirement is part of the strategies to improve indoor air quality by reducing particulate matter in the air, which can be achieved by using filters with a Minimum Efficiency Reporting Value (MERV) of 13 or higher 1 .

References :

LEED v4: Interior Design + Construction Guide 1 .

LEEDuser’s discussion on Filtration Credit Requirements 1 .

To meet the requirements for Indoor Environmental Quality Credit, Interior Lighting, Option 1, the design team should specify lighting controls that enable adjustments to suit individual tasks and preferences. This includes providing controls that allow for on, off, and at least one intermediate light level, such as 50%. Overhead lighting with these controls for the open-office space would meet this criterion.

References : The LEED reference guide for Interior Design and Construction provides detailed information on the requirements for lighting controls under the Indoor Environmental Quality Credit, Interior Lighting, Option 1.  Specifically, it states that for at least 90% of individual occupant spaces, there must be individual lighting controls that enable occupants to adjust the lighting to suit their tasks and preferences, with at least three lighting levels or scenes (on, off, midlevel)  1 .