The following standards shall apply to uses in the water source protection overlay district:
(a) Tanks used for the storage of a regulated substance shall be governed as follows:
(1) A zoning permit shall be issued by the county planning department prior to placement or installation of any tank described below;
(2) All metallic tanks installed underground must be of double-wall construction and cathodically protected;
(3) All nonmetallic tanks installed underground must be of double-wall construction;
(4) All underground tanks must be equipped with a continuous leak detection system capable of immediately detecting a leak and giving audible and visible alarms;
(5) All underground tanks and all aboveground stationary tanks must be equipped with overfill protection devices. These devices must alert the transfer operator that the tank is 90% full or automatically shut off flow to the tank when the tank is no more than 95% full. All tanks must be equipped with an impervious spill containment basin;
(6) All fluid handling piping shall be of double-walled construction and shall include double-wall containment at the tank and to grade under any dispensing device;
(7) Piping on pressure systems shall be equipped with leak detection devices that will promptly notify the operator of a problem in the system in one or more of the following manners:
A. Give an audible and visible warning through the tank alarm panel; and
B. Completely stop the flow of the material to the dispenser.
(8) Secondary containment shall be provided around and under all aboveground stationary tanks and consist of native soils, clays, bentonites or artificially constructed material equivalent to 60 mil high density polyethylene or greater. An impermeability of at least ten (-6) centimeter/second is required to permit containment and detection of a release. Secondary containment must be constructed and maintained to meet impermeability requirements for the operational life of the tank(s). Secondary containment must be capable of containing 110% of the volume of the largest tank;
(9) Storage of petroleum products in stationary aboveground tanks as part of an agricultural activity shall be governed as follows:
A. A tank with a capacity of 55 gallons or less shall be exempt from these standards; and
B. A tank with a capacity in excess of 55 gallons or a series of tanks with a total capacity exceeding 100 gallons shall provide secondary containment as set forth in division (a)(8) above.
(10) Propane tanks shall be exempt from these standards.
(b) Sewer lines must be of PVC material and the joints must be sealed.
(c) When pastured animals are confined for winter feeding and the number exceeds 200 animal units, measures shall be employed to contain all wastes on-site. Winter feeding of pastured animals shall not constitute a concentrated animal feeding operation.
(1992 Code, App. C, § 14A.04) (Ord. 20-02, passed 3-18-2002)