OAR 690-230-0115: Injection Plan for Wells with an Anticipated Injection Rate Exceeding 15,000 Gallons Per Day

No low-temperature geothermal injection well shall be used for injection without approval of the Director in accordance with OAR 690-210-0070. The injection plan for the proposed injection of greater than 15,000 gallons per day to a low-temperature geothermal injection well shall include, but is not limited to, the following: (1) Details of well construction, including water supply well reports for the production well and the injection well. (2) Description of the number and location of water bearing zones from both production and injection wells. (3) Water temperature data from both the production and injection wells. (4) Water level data from both the production and injection wells. If information from the well report is not sufficient to determine the effects of injection, the Director may require additional geologic or hydrologic information, including but not limited to, temperature/depth logs of the wells. (5) Water quality information including analysis by a laboratory certified by the Oregon Health Division for drinking water standards for the following parameters: arsenic, boron, calcium, carbonate or bicarbonate, chloride, fluoride, iron, magnesium, manganese, pH, potassium, silica, sodium, specific conductance, sulfate, suspended solids, total dissolved solids, and total coliform bacteria. If the low-temperature geothermal effluent is suspected to be of poor water quality or to be otherwise incompatible with the water in the receiving zone in the injection well, the Director may require additional specific water quality data. If the information on the well reports for the wells involved is not sufficient to determine the effects of injection, the Director may require additional geologic or hydrologic information, including but not limited to, temperature/depth logs of the wells. The Director may waive the requirement for specific portions or all of the chemical analyses if the fluid quality is known to be suitable for the intended production and injection. (6) A map indicating the location and elevation of both the production well and the injection well in accordance with OAR 690-230-0045. All maps shall be drawn to a standard, even scale of not less than 4 inches = 1 mile. Small area maps may be more easily and clearly drawn to a larger scale, such as 1 inch = 400 feet. The well owner shall submit injection plans to the Director indicating proposed separation distances between production and injection wells on the parcel of land on which the production well is located, on the parcel of land on which the injection well is located, and on all adjacent parcels of land, as well as land surface elevation at each well head. (7) Any planned safeguards to prevent substantial thermal or hydrologic interference with existing rights to appropriate ground water and surface water and alteration of existing or potential drinking water supplies.