17.40

Other

• Compost application rate4 cubic yardscubic yard (cy)A unit of earth volume used in grading limits — roughly one dump-truck scoop. per 1000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  For landscape installations, compost at a rate of a minimum of four cubic yards per 1,000 square feet of permeable area shall be incorporated to a depth of six inches into the soil.

• Distance for conifer pruning from structure30 ft

  Retained conifer trees located within 30 feet of a habitable structure shall be pruned to the highest roof deck height, or a maximum of 1/3 of the total tree crown height.

• Noncombustible area width around structures5 ft

  All landscape projects shall include a noncombustible area at least five-feet-wide that surrounds the base of structures.

• Flow sensor required for residential landscapes5,000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Irrigation systems for nonresidential landscapes and residential landscapes of 5,000 square feet or larger shall include flow sensors

• Minimum irrigation efficiency for drip81 pct

  and 81 percent efficiency for drip system devices

• Minimum irrigation efficiency for overhead spray75 pct

  An irrigation system is expected to meet or exceed 75 percent efficiency for overhead spray devices

• Minimum landscape area for new construction500 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  New construction projects with an aggregate landscape area equal to or greater than 500 square feet.

• Minimum landscape area for rehabilitation2,500 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Rehabilitation landscape projects with an aggregate landscape area equal to or greater than 2,500 square feet.

• Maximum slope for turf25 pct

  Turf shall not be planted on slopes greater than 25 percent.

• Minimum turf area width10 ft

  No portions of turf areas shall be less than ten feet wide to prevent overspray.

• Mulch depth3 inches

  A minimum three-inch layer of mulch shall be applied on all exposed soil surfaces of non-turf planting areas

• Overhead irrigation setbackSetbackThe distance a building must be held back from a lot line. from non-permeable surface24 inches

  Overhead irrigation is prohibited within 24 inches of any non-permeable surface.

• Pressure regulation setting60 psi

  Pressure regulation shall be required on all projects and set to 60 pounds per square inch

• Minimum horizontal distance between tree crowns10 ft

  At least ten feet of horizontal distance between individual tree crowns shall be maintained for retained conifer trees within 30 feet horizontal distance of a habitable structure.