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ST. BARBARA CATHOLIC SCHOOL TASK 2 75-24272-01 DIOCESE OF ORANGE SEPTEMBER 12TH, 2024 SANTA ANA, CA BID & PERMIT SET STORM DRAINAGE 334100 - 5 3. Perforations: Perforations in ABS and PVC pipe shall be circular, no more than 5/16" or less than 3/16" in diameter, and arranged in rows parallel to the longitu- dinal axis of the pipe. Perforations shall be approximately 3 inches cen- ter-to-center, along rows. The rows shall be approximately 1-1/2" inches apart and arranged in a staggered pattern so that all perforations lie at the mid-point be- tween perforations in adjacent rows. The rows shall be spaced over not more than 90 degrees of circumference. The spigot or tongue end of the pipe shall not be perforated for a length equal to the depth of the socket and perforations shall con- tinue at uniform spacing over the entire width of the pipe. Manufacturer's stand- ard ABS or PVC pipe essentially meets these requirements and may be substitut- ed upon approval. Wall thickness as required for earth loads and as approved by Soils Engineer, 4" diameter, SDR35 minimum. 4. Acrylonitrile-butadiene-styrene (ABS) pipe shall be joined using solvent cement or elastomeric joints and shall be in accordance with ASTM D 2751. 5. Polyvinyl Chloride (PVC) pipe joints shall be in accordance with ASTM D 3212. 6. Furnish subsoil drainage pipe prewrapped or wrap pipe with Mirafi 140N Filter Fabric, or Bidim C22 or C28 fabric manufactured by Monsanto; or equal. 2.5 2.6 MANHOLES A. Standard Precast Concrete Manholes: ASTM C 478, precast, reinforced concrete, of depth indicated, with provision for sealant joints. 1. Diameter: 48 inchesminimum, unless otherwise indicated. 2. Ballast: Increase thickness of precast concrete sections or add concrete to base section, as required to prevent flotation. 3. Base Section: 6-inchminimum thickness for floor slab and 4-inchminimum thickness for walls and base riser section and having separate base slab or base section with integral floor. 4. Riser Sections: 4-inchminimum thickness, and of length to provide depth indicated. 5. Top Section: Eccentric-cone type unless concentric-cone or flat-slab-top type is indicated. Top of cone of size that matches grade rings. 6. Joint Sealant: ASTM C 990 bitumen or butyl rubber. 7. Resilient Pipe Connectors: ASTM C 923, cast or fitted into manhole walls, for each pipe connection. 8. Steps: Individual FRP steps, FRP ladder, or ASTM A 615/A 615M, deformed, 1/2- inchsteel reinforcing rods encased in ASTM D 4101, PP wide enough to allow worker to place both feet on 1 step and designed to prevent lateral slippage off of step. Cast or anchor steps into sidewalls at 12- to 16-inchintervals. Omit steps if total depth from floor of manhole to finished grade is less than 60 inches 9. Adjusting Rings: Interlocking rings with level or sloped edge in thickness and diameter matching manhole frame and cover. Include sealant recommended by ring manufacturer. 10. Grade Rings: Reinforced-concrete rings, 6- to 9-inchtotal thickness, to match diameter of manhole frame and cover. 11. Manhole Frames and Covers: Ferrous; 24-inchID by 7- to 9-inchriser with 4-inch- minimum width flange and 26-inch-diameter cover. Include indented top design with lettering cast into cover, using wording "STORM DRAIN."