22.44.1340

Other

• Crop best management practices

  Pollution caused by the growing of crops shall be controlled by the strict adherence to the crop best management practices found in Section 22.44.1300.

• Development of Water Quality Concern thresholds

  Residential development consisting of five or more units. Any development where 75 percent or more of the parcel area will comprise impervious surface. All new development projects involving one acre or greater of disturbed area. All new development projects with more than 10,000 square feet of impervious surface area. New institutional facilities with 10,000 square feet or more of surface area. New commercial centers with 10,000 square feet or more of surface area. New retail gasoline outlets. New restaurants (SIC 5812) with 5,000 square feet or more of surface area. New parking lots with 5,000 square feet or more of impervious surface area, or with 25 or more parking spaces. New automotive service facilities (SIC 5013, 5014, 5511, 5541, 7532 7534 and 7536-7539). New development discharging directly to a H1 or H2 habitat area, or within 100 feet of an H1 habitat area, as defined in Section 22.44.1810, and creates two thousand five hundred (2,500) square feet or more of impervious surface area. Redevelopment Projects. Street, road, and highway facilities that will add an area of 5,000 square feet or more of impervious surface. All hillside development that will occur on slopes greater than 15 percent, located in areas with erodible soils. Any other development determined by the Department of Public Works to be a DWQC.

• Treatment Control BMPs for DWQC

  If the combination of Site Design and Source Control BMPs proposed for a DWQC is not sufficient to protect water quality and coastal waters, Treatment Control BMPs shall also be required. Treatment control BMPs (or suites of BMPs) that are required for a DWQC shall be designed, constructed, and maintained so that they treat, infiltrate, or filter the Stormwater Quality Design Volume (SQDV), defined as the runoff from the 0.75-inch, 24-hour storm event, or the 85th percentile, 24-hour storm event, as determined from the County 85th percentile precipitation isohyetal map, whichever is greater.

• Erosion and Sediment Control Plan required

  An Erosion and Sediment Control Plan (ESCP) is required for all development projects that involve on-site construction to address the control of construction-phase erosion, sedimentation, and polluted runoff.

• No gradingGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. during rainy season

  Grading operations shall not be conducted during the rainy season (from October 15 to April 15), except in response to an emergency such as to remediate hazardous geologic conditions that endanger public health and safety.

• Minimize imperviousImpervious coverageThe share of a lot covered by anything water cannot soak through — roofs, drives, patios. surfaces

  Development shall minimize the creation of impervious surfaces (including pavement, sidewalks, driveways, patios, parking areas, streets, and roof-tops), especially directly-connected impervious areas.

• Livestock/equine pollution control

  Pollution caused by the keeping of livestock/equines shall be controlled by the strict adherence to the livestock and equine management requirements found in Section 22.44.1450.

• Maintain on-site infiltration

  Development shall maintain, or enhance where appropriate and feasible, on-site infiltration of runoff and capture and use to preserve natural hydrologic conditions, recharge groundwater, attenuate runoff flow, retain dry-weather runoff on-site, and minimize transport of pollutants.

• Prioritize permeable pavement

  Where pavement is required, development shall prioritize the use of permeable pavement (e.g., interlocking paver blocks, porous asphalt, permeable concrete, decomposed granite or gravel), where feasible, to reduce runoff.

• Wildlife-friendly, plastic-free netting required

  Wildlife-friendly, plastic-free netting shall be used in erosion and sediment control products.

• Divert runoff to permeable areas

  Development that creates new impervious surfaces shall divert runoff flowing from these surfaces into permeable areas to maintain, or enhance where appropriate and feasible, on-site infiltration capacity.

• Water Quality and Hydrology Plan required for DWQC

  The applicant for a DWQC shall be required to submit a Water Quality and Hydrology Plan (WQHP), certified by a California Registered Civil Engineer, Professional Geologist, Certified Engineering Geologist, or Certified Hydrogeologist qualified to complete this work.