Specifications include, but are not limited to: Rock Excavation: Rock excavation shall include the excavation, removal and disposal of all boulders and detached rock fragments one (1) cubic yard or more in volume; and all ledge rock, the removal of which, can be accomplished only by drilling and splitting mechanically. Boulders of less than one (1) cubic yard in volume and all soft or disintegrated rock which can be removed without the manipulation noted above shall be classified as "earth excavation." Where boulders are exposed in the sides of or in the bottom of excavations, they shall be wholly or partially removed, as specified or directed. Boulders shall be removed to not less than the lateral trench width payment lines indicated, not less than twelve (12) inches outside structure walls and to not less than twelve (12) inches below the underside of pipes or structure foundation slabs. Materials: All PVC gravity sewer pipes shall conform strictly to the requirements of the standard specifications for ASTM D3034-16, Standard Specification for SDR 26, Type PSM Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings, the American Society for Testing and Materials. 1.3 Construction Methods: Contractor shall furnish and lay new polyvinyl chloride (PVC) pipes hereinafter referred to collectively as storm drain pipes, as shown on the drawing. This Item shall include pipes eight (8) and fourteen (14) inches in diameter;