California Code, Government Code - GOV § 65098.2

(a) Any new logistics use development within 900 feet of a sensitive receptor shall have a buffer as follows:

(b) Buffer areas shall include a solid decorative wall, landscaped berm and wall, or landscaped berm 10 feet or more in height, drought tolerant natural ground landscaping with proper irrigation, and solid-screen buffering trees as described in subdivision (c) and may include other hardscape, access, and passenger vehicle parking improvements.

(c) Trees shall be used as part of a solid-screen buffering treatment and planted in two rows along the length of the property line adjacent to the sensitive receptor.  Trees used for this purpose shall be evergreen, drought tolerant, to the extent feasible, composed of species with low biogenic emissions, of a minimum 36-inch box size at planting, and spaced at no greater distance than 40 feet on center.  Palm trees shall not be utilized.  The buffer area may include any landscaped areas within a public right-of-way or public or private pedestrian walkways.