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1 mm (42 thru 60 inch) (N-12HC) sizes shall conform to AASHTO Type 'D' (which 1 describes dual wall pipe with a smooth waterway). Pipe manufactured for this specification shall comply with the requirements for test methods, dimensions and markings found in AASHTO Designations M252, M294 and O MP7. Pipe and fittings shall be made from virgin PE compounds which conform with the applicable current edition of the AASHTO Material Specifications for cell classification as defined and described in ASTM D3350. The fittings shall not reduce or impair the overall integrity or function of the pipeline. Fittings may be either molded or fabricated. Common corrugated fittings include in-line joint fittings, such as couplers and reducers, and branch or complimentary assembly fittings such as tees, wyes and end caps. These fittings may be installed by various methods such as snap-on, bell and spigot, bell — bell and wrap around couplers. Couplers shall provide sufficient longitudinal strength to preserve pipe alignment and prevent separation at the joints. Only fittings supplied or recommended by the manufacturer shall be used. Where designated on the plans or project specifications, an elastomeric gasket meeting the requirements of ASTM F477 shall be supplied. Installation of the pipe specified above shall be in accordance with either AASHTO Section 30 or ASTM Recommended Practice D2321 as described elsewhere in these specifications and as recommended by the manufacturer. Perforated pipe within the drain field shall be Class II, CD SLOT, for 4" — 10" diameter piping and Class II, E (Circular), for 12" — 18° diameter piping. Corrugated polyethylene .pipe shall be manufactured in accordance with ASTM F405 and PASHTO M252 as manufactured by ADS, or approved equal. END OF SECTION 1 1 1 1 1 1 t05/08 02630-2 05-4893 •