As conditions of project approval for the issuance of a grading or building permit for projects in a HCR District, each of the following equipment standards shall be met: (a) 10-wheeler dump trucks (with a 10 cubic yard capacity) or smaller are the only type of trucks permitted for hauling of earth. Notwithstanding the foregoing, the Board of Building and Safety Commissioners may authorize the use of other types of hauling vehicles for a project through the Haul Route approval process. (b) Hauling and grading equipment shall be kept in good operating condition and muffled as required by law. 6. Operating Hours and Construction Activity. Compliance with each of the following standards shall be required for all projects in a HCR District requiring the issuance of a grading or building permit. However, if a Haul Route approval by the Board of Building and Safety Commissioners is required for import and/or export of 1,000 cubic yards or more, then the conditions set by the Board of Building and Safety Commissioners during the Haul Route approval process shall prevail and the following standards shall not apply. (a) Hauling operations shall be conducted only on Monday through Friday, between the hours of 9:00 a.m. and 3:00 p.m. Hauling operations on Saturdays, Sundays, or state or federal designated holidays is strictly prohibited. (b) Haul trucks shall be staged off-site and outside of the HCR District. As deemed necessary, the Board of Building and Safety Commissioners may permit staging on-site or in any alternate staging area by special condition during the Haul Route Approval process. (c) Construction activity shall be limited to Monday through Friday, between the hours of 8:00 a.m. to 6:00 p.m. Exterior construction work at any other time is strictly prohibited. However, interior construction work may be conducted on Saturdays between the hours of 8:00 a.m. to 6:00 p.m. Excess exterior illumination of the site through the use of flood lights and/or similar lighting devices is strictly prohibited after 6:00 p.m. on any day of the week. (d) A log noting the dates of hauling activity and the number of hauling truck trips per day shall be available on the job site at all times. (e) The owner or contractor shall control dust caused by grading and hauling and provide reasonable control of dust caused or exacerbated by wind at all times.