A. Performance Requirement No. 1: Site Design And Runoff Reduction:
1. Projects that create and/or replace more than two thousand five hundred (2,500) square feet of impervious surface (collectively over the entire project site), including detached single-family home projects and are located within the city stormwater service area that drain to the Kings River or other U.S. body of water, must comply with the following runoff reduction practices:
a. Limit disturbance of creeks and natural drainage features.
b. Minimize compaction of highly permeable soils.
c. Limit clearing and grading of native vegetation at the site to the minimum area needed to build the project.
d. Minimize disturbance to impervious surfaces.
e. Minimize stormwater runoff by implementing one or more of the following site design measures:
(1) Direct roof runoff into cisterns or rain barrels for reuse.
(2) Direct roof runoff onto vegetated areas safely away from building foundations and footings, consistent with California building code.
(3) Direct runoff from sidewalks, walkways and/or patios onto vegetated areas safely away from building foundations and footings, consistent with California building code.
(4) Direct runoff from driveways and/or uncovered parking lots onto vegetated areas safely away from building foundations and footings, consistent with California building code.
2. The city will confirm that projects comply with site design and runoff reduction performance requirements by means of appropriate documentation (e.g., checklists) accompanying applications for project approval.
B. Performance Requirement No. 2: Water Quality Treatment:
1. Sampling and analysis for sediment/silt or turbidity are required when the runoff from a construction site discharges directly into the Kings River or other U.S. body of water (not through the city storm drain system). Sampling is not required if all stormwater runoff is contained on site and allowed to infiltrate or evaporate.
2. Stormwater sampling shall be performed per the "Cal Trans Storm Water Quality Sampling Guidance Manual".
C. Performance Requirement No. 3: Runoff Retention: All projects, except detached single-family homes, that create and/or replace more than fifteen thousand (15,000) square feet of impervious surface (collectively over the entire project site), and detached single-family homes more than fifteen thousand (15,000) square feet of net impervious area, and are located in the city stormwater service area that drains to the Kings River or other U.S. body of water are required to meet the runoff retention performance standards using low impact development principles and practices, subject to approval by the city.
D. Performance Requirements No. 4: Peak Management: The city will require all projects that create and/or replace more than twenty two thousand five hundred (22,500) square feet of impervious surface (collectively over the entire project site), and are located within the city stormwater service area that drains to the Kings River or other U.S. body of water, to manage peak stormwater runoff and to meet water quality treatment and runoff retention performance standards as set forth in this section.
E. Performance Requirement No. 5: Special Circumstances: Projects with a scope of work that have certain site and/or receiving water conditions may be defined as a special circumstances project. The special circumstances designation exempts a project from runoff retention and/or peak management performance standards where those performance standards would be ineffective to maintain or restore beneficial uses of receiving waters. (Ord. 2015-008, 10-13-2015)