(a) For purposes of this section, the following definitions apply:

1. (1) “Fiber” means fiber optic cables, and related ancillary equipment such as conduit, ancillary cables, hand holes, vaults, and terminals.
2. (2) “Local agency” means a city, county, city and county, charter city, special district, or publicly owned utility.
3. (3) “Microtrench” means a narrow open excavation trench that is less than or equal to 4 inches in width and not less than 12 inches in depth and not more than 26 inches in depth and that is created for the purpose of installing a subsurface pipe or conduit.
4. (4) “Microtrenching” means excavation of a microtrench.

(b)

1. (1) The local agency with jurisdiction to approve excavations shall allow microtrenching for the installation of underground fiber if the installation in the microtrench is limited to fiber, unless the local agency makes a written finding that allowing microtrenching for a fiber installation would have a specific, adverse impact on the public health or safety.
2. (2) Upon mutual agreement, a microtrench may be placed shallower than 12 inches in depth.
3. (3) To the extent necessary, a local agency with jurisdiction to approve excavations shall adopt or amend existing policies, ordinances, codes, or construction rules to allow for microtrenching pursuant to this subdivision.

4. (4) Nothing in this section shall supersede, nullify, or otherwise alter the requirements to comply with safety standards, including, but not limited to, the following:

   1. (A) Article 2 (commencing with Section 4216) of Chapter 3.1 of Division 5 of Title 1.
   2. (B) Public Utilities Commission General Order No. 128, or a successor standard.