NOTES J J w 1 See Standard Specifications Section 7-083(3) 0 0 for Pipe Zone Backfill i z 0 w 2 See Standard Specifications Section 9-0312(3) u

for Gravel Backfill for Pipe Zone Bedding

middot (TYP) 12 GRAVEL BACKFILL FOR

~

PIPE ZONE BEDDING 3 See Standard Specifications Section 2-094 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-520

B-540 B-560 B-1020 B-10-40 B-15208-1540 B-1560 B-2520 B-2560 B-3520 AND B-3540

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 OD (SEE NOTE 4)

15 OD

w z 0 N w Q a

GRAVEL BACKFILL FOR PIPE ZONE BEDDING

(SEE NOTE 2)

TRENCH WIDTH

(SEE NOTE 3)

ltD

ci 0

k

w z 0 N w Qa

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 bull

(SEE NOTE 3)

PIPE ZONE BACKFILL (SEE NOTE 1)

GRAVEL BACKFILL FOR PIPE ZONE BEDDING

(SEE NOTE 2)

FOUNDATION LEVEL l_

k

~ ci w0 0 z LO 0 0

N w ~ 0 ci Q

0 0 aLO

ltD

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

DIAMETER2 OR36

WHICHEVER IS LESS

Aug 17 2021

PIPE ZONE BEDDING AND BACKFILL

STANDARD PLAN B-5520-03 SHEET 1 OF 1 SHEET

APPROVED FOR PUBLICATION

~ Aug 17 2021 STATE DESIGN ENGINEER METAL AND STEEL RIB

Washington Stole Department of TransportationREINFORCED POLYETHYLENE PIPE