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All requirements for reinforced concrete pipe. except those referring to reinforce,ment shall apply to ncm-'reinforced concrete pipe. The minimum class fOl: RCP pipe shall be Class-II with flexible gasket material :meet:i.ng ASTM C443 and gasket bell and spigot joints. The required pipe strength shall be dete,rmined from the actual depth of cover" true load, and propose,d fi.eld conditions. A typical design strength calculation shall be submitted to the city for approval. Corrugated metal pipe may be used in parks, grl!en belts, and other open space areas upon approval of the city. Where corrugated pipe is intended to be used as the storm sewer pipe or culvert material, the minimum gage for the pipe shall be det:ermined from Colorado Department of Transpor'::ation (COOT) Standard Plan M-603-l, November 1, 1992, or latest edition for actual dl!pth of cover. site specific calculations may be submitted utilizinq the following structural design specifications: 'AASHTO - Standard Specifications for Highway Bridges ... Division 0, section :";, II.STM - Standard Practice for Structural Design of corrugated S'teel Pipe, pipe Arches, and Arches for Storm and Sanitary S,ewl~rs and other Buried Applications, ASTM A796. The minimum gage, for corrugated metal pipe buried beneath railroad tracks shall be determined from American Railroad En:;rineers Association spElcification, AREA - Section 4.9." Also, when corrugated metal pipe is intended to be used as the storm sewer pipe or culvert material, site soil pH and Rrnin, minimum resistivity, tests shall be performed. pH shall be measured for soil and lNater. Minimum resistivity s.hall be for soil and water and shall be determined in the laboratory and not in the field. Corrugated aluminum pipe may be used when t.he pH is between 4.5 and 9.0 and Rrnin is 500 ohm-em or grea.te:r. Galvanized steel corrugated pipe may be used when the pH is bE!tvTeen 5.8 and 10.0 and Rrnin is 2000 ohm-em or greater. Supplemental corrosion protection coatings approved by the city shall be applied to corrugated steel pipe when the pH is outside the above-stated range and/or Rrnin is less than 2000 ohm-em.. Backfill of HDPE pipe or any flexible pipe is very critical. The backfill is a major component to the structural integrity of the pipe system. Bedding materials used and cOlIlpaction must have good quality control for a successful pipe installation.. Bedding should be at a minimum a CDOT #67 3/4-inch crushed rock, six to eight inches deep under the pipe and backfilled to a foot over the pipe. Design of backfill also must comply with the requirements of the AASHTO Engineering Design Manual Section IS:. RCP pipe and other rigid pipe systems are leSE; susceptible to failure because of improper bedding and backfill procedures. 6-2 I I I I I I I I I I I I I I I I I I I