Current through Register Vol. 35, No. 11, June 11, 2024
Section 20.6.7.26 - REQUIREMENTS FOR TRUCK AND EQUIPMENT WASHING UNITSA.Engineering design requirements. At a minimum, the following requirements shall be met in designing new truck and equipment washing units at copper mine facilities unless the applicant or permittee can demonstrate that an alternate design will provide an equal or greater level of containment. (1) Truck and equipment washing shall be conducted on a concrete pad or a pad constructed of materials of equivalent or lower permeability designed to capture all wash water.(2) Captured wash water shall freely drain from the containment pad and when necessary be conveyed to an oil water separator to remove oil and grease from the wash water.(3) Wash water from the oil water separator shall be conveyed to a tank system designed and constructed pursuant to 20.6.7.23 NMAC, an impoundment meeting the requirements of Subsection D of 20.6.2.7.17 NMAC, or may be directed to the mine process water circuit for use.B.Construction.(1)New wash units for trucks or equipment. Construction of new truck or equipment wash shall be performed in accordance with the applicable engineering requirements of Subsection A of 20.6.7.26 and 20.6.7.17 NMAC.(2)Existing wash units for trucks and equipment. A truck or equipment wash unit in existence on the effective date of the copper mine rule and located outside of the open pit surface drainage area shall meet the design requirements of Subsection A of 20.6.7.26 NMAC within one year of the approval of a discharge permit renewal pursuant to the copper mine rule.C.Operational requirements. A permittee operating a truck or equipment wash unit at a copper mine facility shall operate pursuant to the following requirements. (1) The truck or equipment wash unit shall remain within the area identified in the discharge permit.(2) Wash water generated at the unit shall be contained within the designed containment pad, separator and tank system, or impoundment until treated to meet applicable standards for discharge or conveyed to the process water circuit.(3) The tank systems associated with the unit shall meet the operational requirements of 20.6.7.26 NMAC.(4) Any leaks or spills of wash water from the containment pad, separator, tank system or impoundment shall be shall be recorded, reported and corrected pursuant to Subsection G of 20.6.7.30 NMAC.(5) Any wastes generated from the oil water separator or the tank system shall be disposed of offsite in accordance with applicable laws or onsite in a manner approved by the department.20.6.7.26 NMAC - N, 12/1/13