In addition to the standards .specified in Section 809 of this Article, the construction or modification of water wells shall comply with the following:
(a) Water wells shall be located an adequate distance from all potential sources of contamination and pollution. Such minimum distances shall be as follows:
(1) Sewer-50 feet.
(2) Watertight septic tank-100 feet.
(3) Subsurface sewage leach line or leach field-100 feet.
(4) Cesspool or seepage pit-150 feet.
(5) Animal or fowl enclosures-100 feet.
(6) Any surface sewage disposal system-200 feet.
(b) Minimum distances of the water well from sources of pollution or contamination may be increased when the Department determines that particularly adverse or special hazards exist, the foregoing distances may be increased. Alternatively, the Department may require specially approved means to protect the quality of groundwater extracted for beneficial uses and in the underlying aquifer(s).
(c) A sounding pipe or other access to well casing.
(d) A check valve shall be provided on the pump discharge line adjacent to the pump.
(e) An unthreaded spigot shall be provided on the pump discharge line of any well adjacent to the pump and on the upstream side of the check valve.
(f) A flow meter or other suitable measuring device shall be located at each water well and shall accurately register the quantity of water being withdrawn from the water well.
(g) An air-relief vent, if installed, shall be directed downward, be screened, and otherwise be protected from the entrance of contaminants.
(h) All pump discharge pipes not discharging or open to the atmosphere shall be equipped with an automatic device to prevent backflow and/or back siphonage into a water well. Specific backflow prevention measures are required for drinking water supply wells, as prescribed in Sections 7583-7585 and 7601-7605 of Title 17 of the California Code of Regulations.
(i) After completion of the construction or modification activity, the water well shall be thoroughly cleaned of all foreign substances. The well gravel used in packed wells, pipes, pump, pump column, and all well water contact equipment surface shall be disinfected by a Department-approved method. The disinfectant shall remain in the water well and upon all relevant surfaces for at least twenty-four (24) hours. Disinfection procedures shall be repeated until microbiologically safe water can be produced, as set forth in the California Code of Regulations, Title 22, Domestic Water Quality Monitoring. At the discretion of the Department, for the purpose of protecting public health and safety, any new or modified water well shall be tested for all water quality standards as set forth in Title 22 of the California Code of Regulations.
(Added by Ord. 113-05, File No. 050547, App. 6/10/2005)