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RESOLUTION 95-081 313 less than one percent shall be designed by a regis- tered civil engineer. The engineer shall be respon- sible for supervising the installation and shall certify in writing that the sewer installation is in compliance with the approved plan, relative to line and grade. With respect to these two amendments, the City Council finds and determines as follows: These amendments are necessary because of problems which have arisen in excessively flat-graded drain systems. Santa Ana's sewer system in many areas is relatively shallow. This has precluded the design and installation of drainage systems with recommended grades. Additionally, many areas of Santa Ana have a high water table which results in an unstable soil condition. Pipe settlement due to uncompacted soil may result in a drainage system which is flat or reverse graded, causing stoppages or complete blockage of the drainage system. 2. Section 8-341 of the Santa Ana Municipal Code will amend section 314.7 of the Uniform Plumbing Code to read as follows: 3~4.7 Horizontal cast-iron drain, waste, and vent piping, and all other suspended horizontal piping two and one-half (2~) inches and larger, shall be supported with approved rod and hangers. Exception: Plumbers tape (perforated strap-iron) may be used to support piping 2" and smaller in type V (wood) construction only. Plumbers tape shall be galvanized and not less than 3/4" wide and 22 gage. Also, Section 8-342 of the Santa Ana Municipal Code will amend Table 3-1 of the Uniform Plumbing Code by adding footnote 2 to the requirements for horizontal piping of the following materials: Copper Tube and Pipe; Steel and Brass Pipe for Water or DWV; Steel, Brass and Tinned Copper Pipe for Gas; Schedule 40 PVC and ABS DWV; CPVC; and Lead. With respect to these two amendments, the City Council finds and determines as follows: These amendments are necessary to provide proper support for all horizontal piping because of the significant potential for damage due to seismic activity. Santa Ana is in close proximity to major active fault systems in Southern California. This area has been designated as seismic zone #4, the highest seismic risk zone in a four-tiered hierarchy which rates the potential risk for seismic activity by geographical areas. 3. Section 8-815 of the Santa Ana Municipal Code amends, and will continue to amend, section 210-1 of the National Electrical Code by adding a sentence to read as follows: