A. Additional Permitted Uses. The following accessory uses shall be permitted in any zone when the principal use itself is permitted:
1. The operation of necessary facilities and equipment in connection with schools, colleges, universities, hospitals and other institutions;
2. Recreation, refreshment and service buildings in public parks, playgrounds and golf courses.
B. Public Utilities Permitted. Except as provided in Chapter 18.57:
1. Nothing in this code shall prevent the location, erection, alteration or maintenance of pipes, poles, wires, and similar installations necessary to distribute public facilities;
2. In addition to other provisions of this code, the uses of this subsection shall be permitted in any zone and shall not be subject to the minimum lot area requirements. Barbed wire may be used on fences and walls for security purposes, provided the wire is more than six feet above ground level;
3. Water pumping and storage facilities operated as part of a system serving two or more properties as a public, private or community utility:
a. Subject to the requirements for accessory buildings in the zone in which located,
b. Provided a wall or hedge is used to screen the site,
c. Where a tower more than twenty feet in height is used in conjunction with such facilities, its center shall be located a distance from any lot line equal to not less than one-half its height;
4. Telephone, telegraph or power substations:
a. Any building housing such substation shall be in keeping with the character of the zone in which located,
b. A substation not enclosed within a building shall be subject to:
1) The minimum front and side yards of the zone in which located; and
2) Appropriate screen planting along any street frontage, which planting and any necessary fencing shall be set at a distance not closer to a street lot line than the minimum front and side yards of the zone;
5. Power substations with an input voltage of one hundred fifteen kilovolts or greater shall be subject to the following requirements:
a. Setback: That the facility, including walls or equipment, is located no closer than two hundred feet to any existing residential property line,
b. Screening:
1) That the facility include a ten-foot high wall in an earth tone and vegetative landscaping when contiguous to a residential zone,
2) Vegetative landscaping shall be located to preclude attracting athletic activities in the setback area,
c. Height: That the facility observe the height restriction of the zone in which located,
d. Notification: When the utility purchases land with the intent of constructing a power substation facility, the property must be posted stating that intent,
e. Noise emissions:
1) That the sound level emitted by the facility shall not exceed forty-five DBA at the property line,
2) That there shall not be any TVI (television interference) or RIV (radio interference) on a continuous basis,
f. The board of supervisors may waive the minimum requirements of Section 18.07.040(B)(5)(a) through (e), or impose more restrictive requirements at an advertised public hearing if the supervisors determine such an action is in the public interest,
g. Power substation permit issued by the supervisors after a public hearing:
1) Notice shall be given by mail to all owners of record within six hundred feet of the substation and by posting the substation site,
2) An applicant for a permit shall pay a fee in accordance with the development services fee schedule.
h. The supervisors may approve or deny an application and may impose reasonable conditions upon the issuance of a substation permit and shall consider the following factors:
1) Existing plans of the state, local government and private entities for other developments at or in the vicinity of the proposed site,
2) Fish, wildlife and plant life and associated forms of life upon which they are dependent,
3) Noise emission levels and interference with communication signals,
4) The proposed availability of the site to the public for recreational purposes, consistent with safety considerations and regulations,
5) Existing scenic areas, historic sites and structures or archaeological sites at or in the vicinity of the proposed site,
6) The total environment of the area,
7) The technical practicability of achieving a proposed objective and the previous experience with equipment and methods available for achieving a proposed objective,
8) The estimated cost of the facilities and site as proposed by the applicant and the estimated cost of alternative facilities and sites, recognizing that any significant increase in costs represents a potential increase in the cost of electric energy to the customers or the applicant,
9) Any additional factors which require consideration under applicable federal, state and Pima County laws,
10) The supervisors shall give special consideration to the safety and health of neighboring residents,
i. The requirements of Section 18.07.040(B)(5)(g) and (h) shall be eliminated on those sites which are considered by the Arizona Power Plant and Transmission Line Siting Committee when that committee contains adequate local representation. The determination of adequate local representation on the committee shall be made by the supervisors at a public hearing.
C. Clay, Sand or Gravel Pits, Rock or Stone Quarries, Gas or Petroleum Drilling Permitted. Clay, sand or gravel pits, rock or stone quarries and drilling for petroleum or natural gas may be permitted in any zone, except MU; provided, that said use is designed and located so as not to create any unusual hazard or nuisance in the immediate neighborhood of the proposed site of said use, and the zoning inspector is hereby authorized to issue a permit for said uses under the conditions set forth in Section 18.53.020(C) (CI-2 General Industrial Zone).
(Ord. 2011-2 § 3 (part), 2011; Ord. 2008-118 § 2, 2008; Ord. 2004-59 § 3, 2004; Ord. 1988-153 § 1 (part), 1988; Ord. 1985-117 § 1 (part), 1985; Ord. 1985-82 (part), 1985)