(A) Grading, erosion control practices, sediment control practices, and waterway crossings shall be constructed in accordance with the design criteria set forth by the City of Yuma Construction Standards and the Erosion Control Drainage Design Manual for Maricopa County, Arizona, as amended, and shall be adequate to prevent transportation of sediment from the site as approved by the City Engineer or their designee. Cut and fill slopes shall be no greater than 4:1, except as approved by the City Engineer to meet other community or environmental objectives.
(B) Clearing, and grading of natural resources, such as natural desert and wetlands, shall not be permitted, except when in compliance with all other sections of this chapter. Clearing techniques that retain natural vegetation and drainage pattern as described in the City of Yuma Construction Standards and the Erosion Control Drainage Design Manual for Maricopa County, Arizona, as amended, shall be used and are subject to approval by the City Engineer or their designee.
(C) Clearing, except that necessary to establish sediment control devices, shall not begin until all sediment control devices have been installed and have been stabilized.
(D) Phasing shall be required on all sites disturbing greater than 40 acres, with the size of each phase to be established as a part of the plan review process and as approved by the City Engineer or their designee.
(E) Erosion control requirements shall include the following:
(1) Soil stabilization shall be completed within 14 days of clearing or inactivity in construction.
(2) If seeding or another vegetative erosion control method is used, such erosion control method shall become established within three weeks or the City shall require the site to be reseeded or a non-vegetative option employed.
(3) Special techniques that meet the design criteria outlined in the City of Yuma Construction Standards and the Erosion Control Drainage Design Manual for Maricopa County, Arizona, as amended, on steep slopes or in drainage ways shall be used to ensure stabilization.
(4) Soil stockpiles must be stabilized or covered at the end of each workday if a major storm is expected.
(5) The entire site must be stabilized, using a heavy mulch layer or another method that does not require germination to control erosion.
(6) Techniques shall be employed to prevent the blowing of dust or sediment from the site.
(7) Techniques that retard and divert upland runoff past disturbed slopes shall be employed.
(F) Sediment control requirements may include:
(1) Sediment basins, sediment traps, or tanks and perimeter controls.
(2) Sediment basins that are designed in a manner that allows adaptation to provide long-term stormwater management, if required by the City Engineer.
(3) Protection for the adjacent properties by the use of a vegetated buffer strip or perimeter controls.
(G) Waterway and watercourse protection requirements shall include:
(1) A temporary stream crossing installed and approved by the State or the City, if a wet watercourse will be crossed regularly during construction.
(2) Stabilization of the watercourse channel before, during and after any in-channel work.
(3) All on-site stormwater conveyance channels designed according to the criteria outlined in the Yuma City Code Title 19 Chapter 192.
(4) Stabilization adequate to prevent erosion located at the outlets of all pipes and paved channels.
(H) Construction site access requirements shall include:
(1) A temporary stabilized access road provided at all sites.
(2) Other measures as required by the City or Design Engineer in order to ensure that sediment is not tracked onto public streets by construction vehicles or washed into storm drains.
(Ord. O2006-38, passed 6-21-06; Ord. O2021-020, passed 8-4-21)