A. Establishment Of Wellhead Or Spring Related Vulnerability Tiers: Surrounding each PWS well or spring shall be four (4) functional tiers that correlate with the vulnerability of a PWS well or spring to contamination. Each tier shall be subject to the functional use and activity limitations prescribed by the city of Payette zoning ordinance.
1. Wellsite Tier: The land that immediately surrounds the wellhead and having a radius of not less than fifty feet (50') from the well, or as otherwise depicted in DEQ's PWS records, shall be known and designated as the wellsite tier. Irrespective of the local land use zone applied within the wellsite tier, uses permitted therein shall be limited to necessary public water supply wellhead equipment, which may include pump houses, wellhead facility buildings, water storage tanks, disinfection equipment, disinfection chemical storage, and approved landscaping. No uses otherwise permitted by the underlying land use zone shall be permitted in the wellsite tier unless approved by DEQ. The area encompassed by the wellsite tier shall include, at a minimum, the land referenced above.
2. Inner Vulnerability Tier: The PWS inner vulnerability tier constitutes those lands located outside the wellsite tier, extending outward to the inside boundary of the intermediate vulnerability tier. The inside boundary of the intermediate vulnerability tier coincides with the outer limit of the area determined to circumscribe the zero to three (3) year TOT area for community and nontransient noncommunity PWSs, or a one thousand foot (1,000') radius for transient noncommunity PWSs as determined by site specific DEQ evaluation. In addition to the land use standards made applicable by the underlying land use zone and general restrictions supplied by the city of Payette zoning ordinance, the land uses, physical installations, or conditions established by title 17, chapter 17.90 of this code shall be prohibited within the inner vulnerability tier as determined within the applicable DEQ records for each PWS.
3. Intermediate Vulnerability Tier: The PWS intermediate vulnerability tier constitutes those lands located outside the inner vulnerability tier, extending outward to the inside boundary of the outer vulnerability tier. The inside boundary of the outer vulnerability tier coincides with the outer limit of the area determined to circumscribe the three (3) to six (6) year TOT area as determined by site specific DEQ evaluation. In addition to the land use standards made applicable by the underlying land use zone and general restrictions supplied by the city of Payette zoning ordinance, the land uses, physical installations, or conditions established by title 17, chapter 17.90 of this code shall be prohibited within the intermediate vulnerability tier as determined within the applicable DEQ records for each PWS.
4. Outer Vulnerability Tier: The outer vulnerability tier constitutes those lands located outside the intermediate vulnerability tier extending outward to the outside boundary of the outer vulnerability tier. The outside boundary of the outer vulnerability tier coincides with the outer limit of the area determined to circumscribe the six (6) to ten (10) year TOT area as determined by site specific DEQ evaluation. In addition to the land use standards made applicable by the underlying land use zone and general restrictions supplied by the city of Payette zoning ordinance, the land uses, physical installations, or conditions established by title 17, chapter 17.90 of this code shall be prohibited within the outer vulnerability tier as determined within the applicable DEQ records for each PWS. (Ord. 1417, 2016)