- California DOT DHR - SAFETY ALERT MEMO 03-08 For outdoor double-retaining walls outdoors, the lower retaining wall is 48" in height, the space between the retaining walls is four feet or more, and the top of the wall is 24" high. - Glen Cove, New York......
[2] §3209. Standard Guardrails, California Building Code, provides description of how guard rails should be constructed. Web search 09/02/2011,original source: www.dir.ca.gov/title8/3209.html [3] Stephenson, Elliott O.,THE ELIMINATION OF UNSAFE GUARDRAILS, A PROGRESS REPORT[PDF]Building Stan...