A Site

Note: The nature of this process-based measure required good communication between the builder and Rater as well as judgment calls by the Rater that the practices are being implemented. It is expected that some of this process will be seen by the Rater, as the Rater should be verifying finish materials during this period.

INTENT

A6.

To reduce indoor environmental quality risks for construction workers in the short term and building occupants in the long term. To minimize construction-related contamination.

STORMWATER CONTROL: PRESCRIPTIVE PATH

CRITERIA FOR QUALIFICATION

Up to three points of credit are available. For projects that would earn more than three points for measures A6.1 through A6.4, credit is capped at three points. Points can be earned as follows:

A6.1. Permeable Paving Material( 1 Point)

Install permeable material on 25 % of the total site hardscape on the site, including driveways, sidewalks, walkways, and patios. Permeable materials include the following

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Gravel Pervious concrete, asphalt, or an open-grid pavement system with at least 50 % permeability Permeable materials Tire spurs

Note: All areas shall have a base with effective percolation and retention capabilities. A6.2. Filtration and / or Bio-Retention Features( 1 Point)

Construct bio-retention or bio-filtration features on site. This includes routing downspouts through landscape. Consider hiring an expert( such as a landscape architect, designer, or geotechnical engineer) to help with design and sizing. If an expert is not available, use the guidelines presented in the City of Emeryville’ s Stormwater Guidelines for Green, Dense Development, Alameda County Waste Management’ s Bay Friendly Guidelines, or the following manufacturer’ s sizing“ rules of thumb”:

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Bio-retention: Planting beds should be at least six inches deep, and each planting bed should be sized to be at least 12 % of the area that is flowing into the planting bed. Bio-filtration: Vegetated swales should not include turf, and should accommodate a flow depth of up to three inches deep. The swale should have a slope of 1 %-6% with a flat bottom of at least 18 inches across and / or incorporate rocks at high flow points, all to allow maximum contact between water and vegetation and to prevent scouring and erosion. A swale’ s length can be flexible. Longer lengths should be at least a nine-minute hydraulic residence time, while shorter lengths can meet the minimal residence time of five minutes or provide effective treatment in areas with smaller discharges.

A6.3. Non-Leaching Roofing Materials( 1 Point) For all roofing, choose non-leaching roofing materials such as:

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Clay or concrete tiles

Draft GreenPoint Rated New Home Rating Manual, 2013 | Page 13

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