The general purpose of this chapter is to establish regulatory requirements for land development and land disturbing activities aimed at minimizing the threats to public health, safety, public and private property, and natural resources within the community from construction site erosion. Specific purposes are to establish performance standards that will provide a single, consistent set of performance standards that apply to all developments and will protect public and private property and Walnut Creek and North Walnut Creek from damage resulting from erosion and sediment in storm water runoff.