§ 8.9.1. Treatment of runoff.

a.

All projects, unless exempt pursuant to 8.9.1.d below, that meet one or more of the following criteria shall provide water quality treatment based on the modeled total suspended solids (TSS) load off the project for post construction conditions. The determination of the TSS load shall be in accordance with the Storm Water Design Manual. The modeled TSS load shall not exceed 850 pounds/acre/year.

(1)

New development that involves the creation of 5,000 square feet or more of impervious cover, or that involves other land development activities of one acre or more;

(2)

Redevelopment that includes the creation, addition or replacement of 5,000 square feet of more of impervious cover, or that involves other land development activity of one acre or more; or,

(3)

Land development activities that are smaller than the minimum applicability criteria set forth in items (1) and (2), above, if such activities are part of a larger common plan of development, even thought multiple, separate and distinct land development activities may take place at different times on different schedules.

b.

The water quality volume (WQV) shall be the runoff from 1.2 inches of rain from the project site. The volume shall be calculated as:

WQV = 1.2(Rv)A;sub§\sub;/12 (ft )

Where Rv = 0.05 +I(0.009)

I = Percent impervious as a whole number

A;b§\b; = On-site area to be treated (ft )

c.

Runoff from any new development or redevelopment, regardless of size, that is defined by the director to be a hotspot land use or activity shall be adequately treated and addressed through the use of structural storm water controls, nonstructural practices and pollution prevention practices.

d.

The following activities are exempt from providing treatment:

(1)

Individual single-family or duplex residential lots that are not part of a subdivision or phased development project;

(2)

Additions or modifications to existing single-family or duplex residential structures; and,

(3)

Repairs to any storm water management facility or practice deemed necessary by the director.

(Ord. of 6-28-2004(5))