Choosing a building's site and managing that site during construction are important to ensure a project’s sustainability. Environmentally responsible site selection discourages development of previously undeveloped land; minimizes a building's impact on ecosystems and waterways; encourages regionally appropriate landscaping; rewards smart transportation choices; and controls stormwater runoff. Additionally, appropriate site management can reduce erosion, light pollution, the heat island effect and construction-related pollution. Buildings can be placed in various locations; project teams should choose the environmentally preferred option and follow up with responsible stewardship of the site.
Albedo, or solar reflectance, is a measure of the ability of a surface material to reflect sunlight, including visible, infrared, and ultraviolet wavelengths, on a scale of 0 to 1. The more sunlight that is reflected, the higher the albedo. Albedo is used when measuring the reflectance of white roofs, in order to prevent Heat Island Effect.
Alternative Fuel Vehicle
Vehicles that use low-polluting, nongasoline fuels to power their engines. Alternative fuels include electricity, hydrogen, propane, compressed natural gas, liquid natural gas, and ethanol.
Alternative fuel vehicles (AFVs) are defined by section 301 of the Energy Policy Act of 1992 and otherwise includes electric fueled vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, dedicated alternative fuel vehicles, dual fueled alternative fuel vehicles, qualified fuel cell motor vehicles, advanced lean burn technology motor vehicles, human-propelled vehicles such as bicycles and any other alternative fuel vehicles that are defined by statute.
Alternative transportation allows people to travel without the need for a single-occupancy vehicle. Examples of alternative transportation methods include human-powered conveyances (e.g. biking, walking), public transit, ridesharing options (e.g. vanpooling, carpooling), and telework. Having an office near alternative transportation options (like buses, light rail and subway) and facilitating access to such hubs through shuttle services makes it easier for occupants to use alternatives, thereby minimizing the pollution and land development impacts of vehicle use.
Alternative Work Arrangement
An alternative work arrangement is any arrangement that differs from an organization’s standard work schedule and/or location. Examples can include telework, a compressed work week, and flexible time.
Bicycle Storage and Changing Rooms
By providing secure bicycle storage, changing rooms, and showers, employers can make the option of biking to work much more accessible and enticing.
Brownfields are former industrial or commercial sites that are contaminated with hazardous waste. Contaminants might include hydrocarbons, petrochemicals and/or asbestos. Brownfields are typically designated as such by a public agency (e.g. EPA).
Building Exterior and Hardscape Management
Building exterior and hardscape management refers to the practices employed to maintain the building envelope, windows, sidewalks, plazas, garages, etc. Negative environmental impacts can be reduced by instituting environmentally sensitive practices for cleaning and maintaining building and hardscape surfaces. These practices include using Green Seal products, purchasing electric powered equipment that does not consume fossil fuels, using low VOC paints and sealants, using environmentally preferable ice melt, and capturing excess water when pressure washers are used.
Compressed Work Week
A compressed work week is a type of alternative work arrangement where a full-time employee will meet the basic work requirement for each pay period in fewer days by working longer hours. The most common types of compressed work week schedules are working four ten-hour days in a week (i.e., a 4/10 schedule) or working 80 hours in a two-week period over nine days (i.e. a 9/80 schedule). In addition to offering a benefit to employees, reducing the number of commute trips helps the agency to achieve its Scope 3 greenhouse gas emission reduction goals.
Connectivity/Public Transportation Access/Walkable
When building a sustainable project, owners and operators can utilize strategies which maximize occupants’ access to services and alternative transportation. Connectivity is locating a project in a location that takes advantage of existing supporting infrastructure and the availability of common services. This includes access to public transportation and the ability of occupants to walk to desired destinations.
Construction Activity Pollution Protection
The construction of a project can disturb soil, disrupt wildlife patterns, contribute to erosion, introduce toxins to the water supply, and generate airborne dust and other particles. Good site management minimizes these problems and maintains the integrity of the project.
Cool pavements refer to paving materials that reflect more solar energy, enhance water evaporation, or have been otherwise modified to remain cooler than conventional pavements.
A piece of building equipment which uses water to absorb heat from air-conditioning systems and regulate air temperature in a facility.
A means of preventing erosion, which is the combination of processes or events by which materials of the earth’s surface are loosened, dissolved, or worn away. Erosion removes topsoil, plant nutrients, and reduces biological activity. Losing this topsoil reduces the soil’s ability to support plant life, regulate water flow, and maintain biodiversity.
A foot-candle is a measure of light intensity. It can be measured indoors and out or horizontally and vertically. It can be used to measure the amount of light escaping from a project’s boundary. The fewer foot-candles that leave a site, the less it contributes to light pollution.
Fuel Efficient Vehicle
Vehicles that use less fuel to travel the same distance as a conventionally fueled vehicle. A standard used to measure fuel efficient vehicles is the American Council for and Energy Efficient Economy (ACEEE).
Greenfield sites are those that are undeveloped – they have not been disturbed by humans.
Hardscape is the inanimate elements of the building’s landscaping. For instance sidewalks, plazas, parking lots, and stone walls are all hardscape. Hardscape prevents water from being absorbed into the soil and can contribute to the heat island effect if it is dark in color.
Heat Island Effect
Cities tend to be warmer than rural locations. This is typically due to the infrastructure built within a city, such as buildings and roads, which absorb heat from the sun and slowly release it during the day and into the night. This is known as the heat island effect. The heat increases local temperatures. Heat Islands can be reduced by installing cool roofs and other surfaces with a high albedo.
Impervious surfaces promote runoff of water instead of infiltration into the soil, grass, or gravel. This can create surges of stormwater and can also introduce pollutants into the water table. Examples of impervious surfaces are parking lots, cement sidewalks, and roads.
Integrated Pest Management (IPM)
Integrated Pest Management is is a process used to reduce or discourage the growth of pest populations. IPM protects human health and the surrounding environment and improves economic returns by employing the most effective, least-risk management option. It uses non-toxic products such as cleaning and physical barriers to entrance before resorting to chemical means. Pests include plants, fungi, insects, and/or animals.
Joint Use of Facilities
Allowing joint use of facilities reduces the amount of land that must be developed to meet community needs. For example, a school sharing its meeting spaces with a community group eliminates the need to build additional meeting spaces.
The process of actively and responsibly tending to the living organisms on a property. This includes integrated pest management, erosion control, sedimentation control, diversion of landscape waste from the waste stream, and reducing chemical fertilizer use. Responsible landscape management plans keep toxins and sediment out of the water supply.
Least toxic is usually used in reference to chemical pesticides for which all active ingredients are known to be inert and that meet the least toxic Tier 3 hazard criteria under the City and County of San Francisco’s hazard screening protocol. The use of least toxic chemical pesticides protects human and animal health, as well as keeping toxic chemicals out of waterways.
Light pollution is excess or misdirected light. In cities, misdirected light contributes to the visible glow in the night sky. Light pollution is technically wasted light – light that is escaping to the night sky rather than being directed downwards for safety. Light pollution interferes with the migration patterns of certain birds and other nocturnal creatures. It also interferes with the people’s enjoyment of the night sky.
A low-emission vehicle releases low levels of particulates and gases into the atmosphere.
Open space is land that has no buildings and is used for public benefit. Vegetated open spaces provide habitat for wildlife, enjoyment for occupants, and an improvement in the quantity and quality of stormwater leaving the site. Buildings can choose to retain open space on their own site or maintain off-site open space.
Pervious ground surfaces allow precipitation to percolate through, letting the water be absorbed and naturally filtered by the ground. Pervious surfaces reduce the amount of water that is sent to storm drains. Types of pervious surfaces include landscape, pavers, porous asphalt, and pervious concrete.
Preferred parking is spaces provided for specific classes of vehicles, usually low or zero-emissions vehicles or vehicle pools. These spaces should be provided in desirable locations (close to the building, covered, etc.) as an incentive for drivers to carpool and use low and alternative fuel vehicles.
Renewable energy can be replaced very rapidly through natural processes. Examples include energy from the sun, wind, small (low-impact) hydropower, geothermal energy, and wave and tidal systems. Using renewable energy can reduce a building's carbon footprint. There are various renewable energy options for buildings - the most common of which are solar panels (also known as photovoltaic or PV panels). Buildings can also purchase renewable energy from offsite sources.
When a project occupies a previously undeveloped (greenfield) site, it will likely destroy some portion of the existing insect, plant and animal habitat. Projects should seek to reestablish natural landscape conditions in some portions of the the disturbed areas in order to correct the site’s natural balance in these areas.
Rideshare programs arrange carpool or vanpool rides for commuters with similar starting locations and destinations.
Site Master Plan
A Site Master Plan is designed to ensure that the environmental considerations made in the initial development of a site continue to be considered for the length of the use of the site.
Brownfield sites require a cleanup of whatever contaminants are present. The process, called site remediation, involves using physical, chemical, or biological means to remove the contamination from the previous use of the site.
When it rains, stormwater either infiltrates into the ground or flows directly into the storm system. Pervious paving and landscaping allow water to be absorbed into the ground, percolating through natural filters and into aquifers. Impervious surfaces, such as sidewalks and roofs, force storm water to flow directly into the storm drain. This can lead to combined sewer overflow during times of significant rainfall. Additionally, excess storm water may collect contaminants prior to entering the storm drain, and depending on the location, may drain into natural waterways without being treated.
Telework is a work arrangement that allows an employee to conduct work during any part of regular, paid hours at an approved alternative worksite, such as from home. In addition to reducing impacts from vehicle commuting, telework can improve productivity, provide employees with greater flexibility, reduce personal costs, and allow services to continue during emergency situations.
Tenant Design and Construction Guidelines
Project owners and managers put a lot of care and thought into the sustainable features of their project. Therefore, it makes sense to communicate all the features and how to best use them to tenants of the property. Tenant Design and Construction Guidelines can help tenants understand the benefits of occupying a sustainably built project and learn how to utilize the building as it was intended.
Vegetated (Green) Roof
A vegetated roof is a layered system of growing medium (soil), filters, and waterproof membrane on the roof of a building. Some or all of a standard roof can be converted into a green roof. Green roofs absorb heat instead of reflecting it, reducing Heat Island Effect. They can also serve as gardens and provide excellent insulation.
Volatile Organic Compound (VOC)
Carbon compounds that participate in atmospheric photochemical reactions (excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides and carbonates, and ammonium carbonate). The compounds become a gas at normal room temperatures and degrade indoor air quality. VOCs can be found in paints, coatings, adhesives, sealants and other finish materials.
Vehicles that are classified as zero-emission vehicles by the California Resources Board. They emit less toxic byproducts into the air than traditional vehicles.
Did You Know?
The U.S. generated approximately 251 million tons of municipal solid waste (MSW) in 2012. Almost 87 million tons were recycled and composted, which represents a 34.5% recycling rate. Solid waste generated per capita is the lowest since the 1980s. This is a 3 percent increase in the tons recycled. Source: US EPA, Municipal Solid Waste Generation, Recycling, and Disposal in the United States: Facts and Figures for 2012.
Comfortable workers are more likely to be productive and engaged with their work than those who struggle to work in spaces that create barriers and stresses. With an ever increasing number of environmental issues to be mindful of when designing spaces, GSA is developing practices that support both sustainability and worker comfort.
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