STANDARD PRECAST GRAVITY WALL NOTES ON PLANS        2-16-10
(Instructions for use are in parenthesis after each note if
applicable and choices are in parenthesis separated by "or".)

FOR PRECAST GRAVITY RETAINING WALLS, SEE PRECAST GRAVITY
RETAINING WALLS PROVISION.

FOR GUARDRAIL, SEE ROADWAY PLANS AND SECTION 862 OF THE
STANDARD SPECIFICATIONS.

FOR SINGLE FACED PRECAST CONCRETE BARRIER, SEE ROADWAY PLANS
AND SECTION 857 OF THE STANDARD SPECIFICATIONS.

A CONCRETE BARRIER RAIL WITH A MOMENT SLAB IS REQUIRED ABOVE
RETAINING WALL NO. ____.  SEE PLANS AND PRECAST GRAVITY
RETAINING WALLS PROVISION FOR DETAILS OF A CONCRETE BARRIER
RAIL WITH A MOMENT SLAB. (Structure Design will add a plan
sheet for a concrete barrier rail with a moment slab to the
wall plans when required.)

A FENCE OR HAND RAIL IS REQUIRED ON TOP OF RETAINING WALL
NO. ____.  SEE ROADWAY PLANS FOR FENCE OR HAND RAIL
ATTACHMENT DETAILS.

USE PRECAST CONCRETE UNITS WITH A ____________ FACE FOR
RETAINING WALL NO. ____.

USE PRECAST CONCRETE UNITS WITH A ____________ COLOR FOR
RETAINING WALL NO. ____.

A SUBDRAIN PIPE (IS or IS NOT) REQUIRED FOR RETAINING WALL NO.
____.

BEFORE BEGINNING PRECAST GRAVITY WALL DESIGN FOR RETAINING
WALL NO. ____, SURVEY EXISTING GROUND ELEVATIONS SHOWN ON
THE WALL PROFILE VIEW (WALL ENVELOPE) AND SUBMIT A REVISED
WALL ENVELOPE FOR REVIEW.  DO NOT START WALL DESIGN OR
CONSTRUCTION UNTIL THIS ENVELOPE IS ACCEPTED. (Use this note
when existing ground line is in the vicinity of wall
elevations.)

DESIGN RETAINING WALL NO. ____ FOR WALL HEIGHTS EQUAL TO THE
DESIGN HEIGHT PLUS DEPTH TO TOP OF FOOTING (DIFFERENCE
BETWEEN GRADE ELEVATION AND TOP OF FOOTING ELEVATION).

DESIGN RETAINING WALL NO. ____ FOR THE FOLLOWING:
1)   MINIMUM SERVICE LIFE = (75 or 100) YEARS
2)   ALLOWABLE BEARING CAPACITY = ____ PSF (kPa)
3)   MINIMUM EMBEDMENT ELEVATION = ____ FT (m)
4)   IN-SITU ASSUMED MATERIAL PARAMETERS:
      MATERIAL TYPE       UNIT WEIGHT   FRICTION    COHESION (c)
                            (gamma)    ANGLE (phi)   PSF (kPa)
                          PCF (kN/m3)   DEGREES
         BACKFILL             ___         __           ___
        FOUNDATION            ___         __           ___
(For minimum service life, use 100 years for critical
precast gravity walls as defined by the MSE wall policy and
75 years for all other precast gravity walls.  Modify
numbers 2 and 4 as necessary for variable wall heights and
subsurface conditions.
Number 3 is optional.  Default minimum embedment in
provision is 2 ft [0.6 m].  Use No. 3 when more than the
minimum embedment is necessary such as precast gravity walls
subject to scour.)

THE MINIMUM EMBEDMENT ELEVATION FOR RETAINING WALL NO. ____
INCLUDES EMBEDMENT FOR SCOUR.

DESIGN RETAINING WALL NO. ____ FOR A LIVE LOAD (TRAFFIC)
SURCHARGE.

DESIGN RETAINING WALL NO. ____ FOR THE (POINT, LINE or STRIP)
SURCHARGE LOAD SHOWN.

DESIGN RETAINING WALL NO. ____ FOR A PIPE EXTENDING THROUGH
THE WALL AS SHOWN.  VERIFY PIPE LOCATION AND ELEVATION
BEFORE BEGINNING PRECAST GRAVITY WALL DESIGN OR
CONSTRUCTION.

ADJUST PAVED DITCH WIDTH OR BACK SLOPE FOR VARYING GRADE
ELEVATIONS ALONG TOP OF RETAINING WALL NO. ____ AND SUBMIT A
CAST-IN-PLACE CONCRETE DITCH DETAIL FOR REVIEW WHEN TOP OF
WALL STEPS DOWN.

DO NOT PLACE CONCRETE FOR FOOTINGS FOR RETAINING WALL NO.
____ UNTIL OBTAINING APPROVAL OF THE EXCAVATION DEPTH AND
FOUNDATION MATERIAL.

“TEMPORARY SHORING” (IS or MAY BE) REQUIRED FOR RETAINING WALL
NO. ____ IN ACCORDANCE WITH THE TEMPORARY SHORING PROVISION.
SEE (ROADWAY, STRUCTURE or TRAFFIC CONTROL) PLANS.

AT THE CONTRACTOR'S OPTION, “TEMPORARY SHORING FOR WALL
CONSTRUCTION” MAY BE USED TO CONSTRUCT RETAINING WALL NO.
____.  SEE PRECAST GRAVITY RETAINING WALLS PROVISION FOR
TEMPORARY SHORING FOR WALL CONSTRUCTION. (Use this note when
temporary shoring is not shown on the plans or required by
the Engineer but may be used for OSHA reasons or the
Contractor's convenience.  For example, when constructing a
precast gravity wall in a cut and traffic is diverted away
or the location is a new alignment, the Contractor may
choose to use temporary shoring for wall construction in
lieu of temporary slopes to excavate for the wall.)