NOTES ...J ...J w 1. See Standard Specifications Section 7-08.3(3) 0 0 for Pipe Zone Backfill. ::i .. z 0:: w 2. See Standard Specifications Section 9-03.12(3) u. for Gravel Backfill for Pipe Zone Bedding. · (TYP.) 12" GRAVEL BACKFILL FOR ! PIPE ZONE BEDDING 3. See Standard Specifications Section 2-09.4 for Measurement of Trench Width. 0 4. For sanitary sewer installation, concrete pipe shall 6" J be imbedded to spring line. SEPARATE BASE (TYP.) INTEGRAL BASE PRECAST PRECAST WITH RISER (48" (IN) - 72" (IN) ONLY) CONCRETE AND DUCTILE IRON PIPE TYPICAL CONDITION FOR DRAINAGE STRUCTURE THIS DETAIL APPLIES TO STANDARD PLANS B-5.20, B-5.40, B-5.60, B-10.20, B-10-40, B-15.20,8-15.40, B-15.60, B-25.20, B-25.60, B-35.20 AND B-35.40. TRENCH WIDTH (SEE NOTE 3) 1~ ~1 PIPE ZONE BACKFILL (SEE NOTE 1) GRAVEL BACKFILL FOR PIPE ZONE BEDDING (SEE NOTE 2) TRENCH WIDTH (SEE NOTE 3) 85% O.D. (SEE NOTE 4) 15% O.D. w z 0 N w Q. a: GRAVEL BACKFILL FOR PIPE ZONE BEDDING (SEE NOTE 2) TRENCH WIDTH (SEE NOTE 3) <D ci 0 k, w z 0 N w Q. a: PIPE ZONE BACKFILL (SEE NOTE 1) GRAVEL BACKFILL FOR PIPE ZONE BEDDING (SEE NOTE 2) w z 0 N w Q. a: 15% RISE PIPE ARCHES THERMOPLASTIC PIPE TRENCH WIDTH • (SEE NOTE 3) PIPE ZONE BACKFILL (SEE NOTE 1) GRAVEL BACKFILL FOR PIPE ZONE BEDDING (SEE NOTE 2) FOUNDATION LEVEL l_ k, ci w 0 0 z LO 0 0 N w 0 ci Q. 0 0 a: LO <D CLEARANCE BETWEEN PIPES FOR MULTIPLE INSTALLATIONS PIPE SIZE MINIMUM DISTANCE BETWEEN BARRELS CIRCULAR PIPE (DIAMETER) UP TO 48" 24" METAL PIPE ARCH (SPAN) 48" AND LARGER DIAMETER/2 OR36" WHICHEVER IS LESS Aug 17, 2021 PIPE ZONE BEDDING AND BACKFILL STANDARD PLAN B-55.20-03 SHEET 1 OF 1 SHEET APPROVED FOR PUBLICATION Aug 17, 2021 STATE DESIGN ENGINEER .... METAL AND STEEL RIB ... Washington Stole Department of Transportation REINFORCED POLYETHYLENE PIPE