Environmentally Critical Areas | Environment & Sustainability
cleanup standards for soil as specified in the Model Toxics Control Act (MTCA). An imported fill source statement is required for all projects where more than 100 cubic yards of fill will be imported to a site. The City may require analytical results to demonstrate that fill materials do not exceed cleanup standards. The imported fill source statement shall include:
ii. A notice on title is recorded documenting the maintenance requirements of the geothermal/heat exchange wells.
Y. Wetlands
1. Wetlands – Development standards
A development proposal on a parcel or parcels containing a wetland or associated buffer of a wetland located on site or off site shall meet the following requirements: a. Wetlands shall be rated according to the Washington State Wetland Rating System for Western Washington (Department of Ecology, 2014, or as may be amended or revised by the Department from time to time). This document contains the definitions, methods and a rating form for determining the categorization of wetlands described below: i. Category 1. Category 1 wetlands include those that receive a score of greater than or equal to 23 through 27 points based on functions, or those that are rated Category 1 based on special characteristics as defined in the rating form. ii. Category 2. Category 2 wetlands include those that receive a score of 20 through 22 points based on functions, or those that are rated Category 2 based on special characteristics as defined in the rating form. iii. Category 3. Category 3 wetlands include those that receive a score of 16 through 19 points based on functions.
i. Source location of imported fill;
ii. Previous land uses of the source location; and
iii. Whether or not fill to be imported is native, undisturbed soil.
f. In Class 1 and 2 CARAs, on lots smaller than one acre, new on-site septic systems are prohibited, unless: i. The system is approved by the Washington State Department of Health and the system either uses an upflow media filter system or a proprietary packed-bed filter system or is designed to achieve approximately 80 percent total nitrogen removal for typical domestic wastewater; or ii. The Seattle-King County department of public health determines that the systems required under subsection 5.f.i. of this section will not function on the site. g. Geothermal/heat exchange wells are allowed, subject to City review and approval, provided:
i. The system is approved by the Washington Department of Ecology as compliant with the provisions of Chapter 173-160 WAC; and
Effective | January 1, 2022
Title 21: Sammamish Development Code | 93
Made with FlippingBook Ebook Creator