Fairways-SP 930716 TRENCH SAFETY
SPECIFICATIONS
FOR
THE FAIRWAYS AT
RIVERCHASE
CITY OF
COPPELL, TEXAS
Prepared for
C. W. YOUNG CONSTRUCTION, INC.
TREN-TECH COMPANY
TRENCH ,.~AI~lZ*I'Y TECHNOLOGY
2560 ELECTRONIC LANE #104
DALLAS, TEXAS
I have reviewed this Tranch Safety Plan ~d find that its recommandations and
procedures conform to OSHA guidelines md regulations. The calculalions
herein are consistmt with ganerally accepted enghaeering practice.
REGISTERED PROFESSIONAL ENGINEER
DATE
1.0 DESIGN ASSUMPTIONS
1.1
General. These specifications cover the basic requirements for shoring and/or
sloping of excavations for the installation of WATER, STORM DRAIN and
SANITARY SEWER to serve the FAIRWAYS AT RIVERCHASE in the CITY
of COPPELL, TEXAS.
1.2
This specification addresses the safety of workers in a trench excavation and does
not, in any way relieve the Contractor of his responsibility and liability to ensure
the safety of the project and workers.
1.3
It is not the intent of these specifications to specify every detail and procedure of
the trenching/shoring operations; nevertheless, they shall conform to the high
standards of engineering and of safe trench excavation.
1.4
The personnel protection systems shown in these specifications have been
designed based on information obtained from the project drawings.
1.5
The personnel protection systems shown in these specifications have been
designed based on the plans and specifications. In accordance with Revised OSHA
(Appendix A to Subpart P effective March 2,1990), the Contractor's "Competent
Person" will conduct the required Soil Classification Tests. If soils other than
those previously identified are found, this specification will be revised. During
construction, the Contractors "Competent Person" will monitor the soil
classification as required by OSHA 1926.
1.6
Contractor shall be responsible for selecting the appropriate safety system option
shown in these specifications, depending on trench depth and soil conditions.
1.7
The protection of existing structures and utilities which may be affected by these
trench excavations is beyond the scope of this report (See Sect.4.2)
1.8
The Comractor must identify a "Competent Person" in the Contractors firm
responsible for performing inspections of the excavations to ensure that expected
subsurface conditions are present. NOTE-This person must be "Competent" as
described in OSHA 1926.650(b).
1.9
h is the Contractors responsibility to ensure that all excavation work and site
conditions are within the regulations as established by OSHA. Any property
damage or bodily injury (including death) arising from the use of these
specifications, from the Contractors negligence in performance of contract work,
or from Owners failure to note exceptions to these specifications shall remain the
sole responsibility and liability of the contractor.
2.0 DEFINITIONS
2.1
All definitions of section 1926.653 of Subpart P, Part 1926, of the Code of Federal
Regulations shall be by reference an integral part of this section.
2.2
2.3
"Sealing Engineer"- The engineer whose Texas seal is affixed to these
specifications.
"The Contractor"-The contractor respons~le to the owner for the excavation
work described herein.
2.4 "Competent" as described in OSHA 1926.650(b).
3.0 APPLICABLE CODES AND STANDARDS
3.1
The Contractor shall perform all shoring work under this contract in accordance
with all applicable codes and standard safety requirements and regulations
including:
3.1.1 OSHA 2207, Construction Industry Standards (Part 1926,
Occupational Safety and Health Standards)
3.1.2 AISC Code of Standard Practice.
3.1.3 AISC Specifications of the design, fabrication, and erection of steel
buildings
3.1.4 AITC Timber Construction Manual
3.1.5 AWS DI.1 Structural Welding Code
3.1.6 The Uniform Building Code
3.1.7 OSHA 2226
3.2
The latest edition (including supplements and revisions) of the above publications
in effect or promulgated at the time of the bid shall apply. Equipment fabricated to
codes and standards in effect at time of bid but later revised shall be acceptable
provided such revisions are not required by law.
2
4.0 SHORING/SLOPING REQUIKEMENTS
4.1
Description.
This section covers the technical requirements of the trenching/shoring work.
4.2
Existing Structures. Where existing buildings, other utilities, streets, highways, or
other structures are in close proximity to the trench, or may otherwise be affected
by the proposed trenching operation, the Contractor shall provide adequate
protection by the use of sheeting and shoring to protect the structure, street, or
highway from possible damage. In the case of utilities, the Contractor may elect to
remove the utility, provided that the removal and subsequent replacement meet
with the approval of the engineer, the ut'flity owner, or whoever has jmisdiction of
the structure. In all cases, it shall be the responsfoility of the Contractor to protect
public and private property and any person or persons who might, as a result of the
Contractors work, be injured.
4.3
General Trenching and Shoring Requirements.
The Contractor shall be solely responsible for trench safety provisions meeting the
applicable requirements of the United States Department of Labor-Occupational
Safety and Health Administration, including subpart P, Part 1926, of the Code of
Federal Regulations. All trenching operations and procedure shall also conform
to the requirements listed in this specification.
4.3.1
The requirements of sections 1926.650 and 1926.651 of Subpart P, Part
1926, of the Code of Federal Reg~j!ations shall be by reference an integral
part of this section.
4.4 Requirements Prior to Excavation Activities
4.4.1
Known underground installations are shown on the site plans. It is the
Contractor's responsibility to verify exact locations in the field.
4.4.2
Before any individual enters an excavation, the excavation will be inspected
by a "Competent Person" to ensure that trench excavation has been
performed according to this specification and OSHA requirements and to
ensure that no anomalies are observed which may effect the safety of the
trench project. Note-This person must be "Competent" as described in
OSHA 1926.650(b).
4.5 Requirements During Excavation Activities.
4.5.1
During excavation, the exact location of existing underground installations
shall be determined by the Contractor, and when uncovered, proper
precautions and supports shall be provided so as not to cause a hazard to
the workmen or the project.
4.5.2
Daily inspections of the excavations shall be made by the Competent
Person". ffthere is evidence of possible cave-ins or slides, all work in the
excavation shall cease until the necessary precautions have been taken to
ensure the safety of the workmen and the trench. Note-This person must be
"Competent" as described in OSHA 1926.650. Excavations shall be
inspected alter every rainstorm or other hazard-increasing occurrence to
ensure safety of the workmen and the trench.
4.5.3
Excavated material shall be stockpiled a distance away from the trench, so
as not to affect the trench stability. The Contractor's means and methods
will determine the distance. As a mininmm to protect the workmen from
falling debris, the toe of the stockpiled soil shall be no closer than two(2)
feet from the edge of the excavation.
4.5.4
All precautions must be made to prevent surface water from entering the
trench excavation. Adequate drainage must be provided in the area adjacent
to the excavation.
4.5.5
Operation of heavy equipment adjacent to the edge of the trench may cause
instability. The Contractor is responsible for the means and methods of
excavation, and therefore, for loads imposed on the trench excavation and
shoring design.
4.5.6
The Contractor must take precautions to protect the face of the excavation
from exposure to excessive drying, water, or freezing.
4.5.7
Water shall not be permitted to stand in the bottom of the trench and
suction pumps of adequate capacity shall be installed to ensure that such
standing water is removed.
4.5.8
The Contractor shall provide a positive means of ensuring that hydrostatic
pressure does not build up behind the shoring or shields.
4
4.5.9
4.5.10
4.5.11
4.5.12
4.5.13
4.5.14
4.5.15
If a condition requiring the use of a different method of shoring is
encountered, this specification will be revised.
Remove shoring units from bottom to top as backfilling proceeds.
When backfill is within five(5) feet ofthe top ofthe trench, all shoring may
be removed, unless the trench conditions indicate a hazard.
No person shall be exposed to the lower portion of the trench at~er shoring
has been removed.
Additional shoring of larger sizes may be installed.
Ladders or other adequate means of exit must be provided and located so as
to require no more than twenty-frye(25) feet of lateral travel
When two(2) trenches intersect, both trenches must be protected to a
distance of not less that the depth of the deepest trench.
SECTION 5.0
SITE SPECIFIC EXCAVATIONS
AND
SHORING SPECIFICATIONS
FOR
SANITARY SEWER
WATER LINE
AND
STORM SEWER
5.1 EXCAVATIONS SPECIFIC TO THIS WORK
STORM SEWER LINE "A"
LOCATION MAX.DEPTH
OPTION
-0+42 6.0 I, II
-0+42 TO 3+20 11.0 I, II
3+20 TO 8+03 11.0 I, II
8+03 TO 8+33 10.5 I, II
8+33 TO 8+77.77 9.0 I, II
8+77.77 5.0 I, II
STORM SEWER LINE "A" LATERALS
MAX.DEPTH
LOCATION
OPTION
4+70.05 9.5 I, n, m
7+98.29 10.0 I, II
8+27.69 9.5 I, II
NOTES
CONST HDWL
INSTALL 42" RCP
INSTALL 30" RCP
INSTALL 24" RCP
INSTALL 18" RCP
CONST INLET
NOTES
INSTALL 18" RCP
INSTALL 18" RCP
INSTALL 18" RCP
STORM SEWER LINE "A- 1"
LOCATION MAX.DEPTH
0+00 10.0
0+00 TO 0+72 10.0
0+72 TO 3+75 5.5
3+75 TO 4+07.10 4.5
4+07.10 5.0
STORM SEWER LINE "A-I" LATERALS
LOCATION
MAX.DEPTH
0+66.90 6.0
3+70.66 4.5
OPTION
I, ii
I, II
I, II, III
I, IL Ill
OPTION
I, II, IH
I, H, m
NOTES
CONN TO 42" RCP
INSTALL 30" RCP
INSTALL 21" RCP
INSTALL 18" RCP
CONST INLET
NOTES
INSTALL 21" RCP
INSTALL 18" RCP
STORM SEWER LINE "B"
LOCATION MAX.DEPTH
OPTION
0+00 4.5 I, II
0+00 TO 2+16 7.5 I, II
2+16 TO 2+58 7.0 I, II
2+58 TO 4+56 7.0 I, II
4+56 TO 4+85.74 6.0 I, II
4+85.74 7.0 I, II
STORM SEWER LINE "B" LATERALS
MAX.DEPTH
LOCATION
2+53.07 6.0
4+52.75 6.5
OPTION
I, IL HI
i,u,m
NOTES
CONST HDWL
INSTALL 36" RCP
INSTALL 30" RCP
INSTALL 27" RCP
INSTALL 21" RCP
CONST INLET
NOTES
INSTALL 18" RCP
INSTALL 18" RCP
STORM SEWER LINE "B-I"
LOCATION MAX.DEPTH
0+00 6.0
0+00 TO 1+69.74 6.0
1+69.74 5.5
OPTION
I, IL RI
i,n,m
NOTES
CONN TO 36" RCP
INSTALL 18" RCP
CONST INLET
STORM SEWER LINE "B-2"
LOCATION MAX.DEPTH
0+00 6.0
0+00 TO 0+70.88 6.0
0+70.88 5.0
OPTION
I, Ikm
i,n
NOTES
CONN TO 36" RCP
INSTALL 18" RCP
CONST INLET
STORM SEWER LINE "B-2" LATERALS
LOCATION MAX.DEPTH
0+41.01 5.0
OPTION
NOTES
INSTALL 18" RCP
STORM SEWER LINE "C"
LOCATION MAX.DEPTH
0+00 4.5
0+00 TO 1+65 12.0
1+65 TO 2+65 11.5
2+65 TO 7+31.18 8.5
7+31.18 5.5
STORM SEWER LINE "C" LATERAL
LOCATION
2+59.91 9.0
OPTION
I, II
I, II
I, II
I, II, HI
I, II
OPTION
NOTES
CONST HDWL
INSTALL 33" RCP
INSTALL 30" RCP
INSTALL 18" RCP
CONST INLET
NOTES
INSTALL 18" RCP
STORM SEWER LINE "C-I"
LOCATION MAX.DEPTH
OPTION
0+00 11.0 I, II
0+00 TO 1+06.83 11.0 I, H
1+06.83 6.0 I, 1I
NOTES
CONN TO 33" RCP
INSTALL 18" RCP
CONST INLET
SANITARY SEWER LINE "A"
LOCATION MAX.DEPTH
OPTION
0+00 19.0 I, II
0+00 TO 0+94.66 17.0 I, II
0+94.66 18.0 I, II
0+94.66 TO 4+61.01 17.0 I, II
4+61.01 14.0 I, II
4+61.01 TO 7+70.44 13.0 I, II
7+70.44 10.5 I, II
NOTES
CONST MH
INSTALL 10" SS
CONST MH
INSTALL 10" SS
CONST MH
INSTALL 10" SS
CONST MH
SANITARY SEWER LINE '°B"
LOCATION MAX.DEPTH
OPTION
0+00 13.0 I, II
0+00 TO 2+84.24 13.0 I, II
2+84.24 12.5 I, II
2+84.24 TO 5+88.35 12.0 I, II
5+88.35 9.0 I, II
NOTES
CONN TO MH
INSTALL 8" SS
CONST Mit
INSTALL 8" SS
CONST MH
SANITARY SEWER LINE "C"
LOCATION MAX.DEPTH
OPTION
0+00 9.0 I, II
0+00 TO 2+65.69 9.0 I, II
2+65.69 7.5 I, II
2+65.69 TO 5+23.75 6.5 I, II
5+23.75 6.0 I, II
NOTES
CONN TO MH
INSTALL 8" SS
CONST MH
INSTALL 8" SS
CONST MH
SANITARY SEWER LINE "D"
LOCATION MAX.DEPTH
OPTION
0+00 9.5 I, II
0+00 TO 3+13.18 9.0 I, II
3+13.18 9.5 I, II
3+13.18 TO 6+53.38 8.5 I, 11, III
6+53.38 7.5 I, II
6+53.38 TO 7+67.84 6.5 I, I~ IH
7+67.84 7.0 I, II
7+67.84 TO 9+93.84 6.0 I, II, IH
9+93.84 6.5 I, II
NOTES
CONN' TO MH
INSTALL 8" SS
CONST MH
INSTALL 8" SS
CONST MH
INSTALL 8" SS
CONST MH
INSTALL 8" SS
CONST MH
SANITARY SEWER LINE "E"
LOCATION MAX.DEPTH
OPTION
0+00 9.5 I, II
0+00 TO 2+65.66 9.0 I, II, IH
2+65.66 9.5 I, II
2+65.66 TO 4+76.47 8.5 I, II, IH
4+76.47 8.0 I, II
NOTES
CONN TO MH
INSTALL 8" SS
CONST MI{
INSTALL 8" SS
CONST MH
SANITARY SEWER LINE "F"
LOCATION MAX.DEPTH
OPTION
0+00 8.0 I, II
0+00 TO 1+59.45 8.0 I, II, III
1+59.45 8.5 I, II
1+59.45 TO 6+04.12 7.5 I, II, IH
6+04.12 6.5 I, II
6+04.12 TO 7+85.81 5.5 I, II, IH
7+85.81 6.5 I, II
NOTES
CONN TO MH
INSTALL 8" SS
CONST MH
INSTALL 8" SS
CONST MH
INSTALL 8" SS
CONST MI1
lO
SANITARY SEWER LINE "G"
LOCATION MAX.DEPTH
OPTION NOTES
0+00 8.0 I, II, III CONN TO MH
0+00 TO 2+47.80 8.0 I, II, III INSTALL 8" SS
2+47.80 5.0 I, II CONST MH
SANITARY SEWER LINE "H"
LOCATION MAX.DEPTH
OPTION NOTES
0+00 8.5 I, II, m CONN TO MH
0+00 TO 3+69.33 7.0 I, Il, IH INSTALL 8" SS
3+69.33 7.5 I, II CONST MH
3+69.33 TO 4+97.04 7.0 I, II, IH INSTALL 8" SS
4+97.04 6.5 I, II CONST MH
WATER LINES & APPURTANENCES
Water lines not profiled. Trenches less than five(5) feet in depth may be cut vertical if there is no
evidence of raveling or caving(OSHA 1926.651 ). Contractogs "Competent Person" will
determine soil stability and use Option I, II or IH if unstable conditions exist.
11
5.2 SHORING ALTERNATIVES FOR THIS WORK
5.2.1
Trenches more than five(5) deep shall be shored, laid back to a stable
slope, or some other equivalent means of protection shall be provided
where employees may be exposed to moving ground or cave-ins.
Trenches less than five(5) feet in depth shall also be effectively protected
when examination of ground indicates hazardous ground movement may
be expected. The Contractor will have options for providing such
protection.
5.2.2 Lateral Earth Pressure
P= a uniformly distributed lateral soil pressure, in lbs./f~2
We= Effective Soil Weight, pcffUse 45 pcfrype "B" Soil)
H= Depth of excavation t~om top of supported bank to bottom of
excavation, in feet.
Hq= Equivalent Height of Surcharge, in iL
P=- We*(H+Hq)
(Reference OSHA Rules and Regulations-Part 1926 of 29 CFR as
amended by the Federal Register Voh~me 54, Number 209, dated
October 31, 1989.)
5.2.3
5.2.4
5.2.5
Option I The Contractor can use Slope as shown in the Option I section
of the specification. Applicable slopes may be obtained by either straight
cut or benched method. Vertical cuts for the benched method shall not
exceed four(4) feet. See Drawing Option I.
Option H The Contractor can use a Trench Shield as shown in the Option
H section of this specification. See Drawing Option H.
Option In The Contractor can use Trench Shores as shown in the Option
1II Section oft}ds specification. See Drawing Option III.
12
Trench Safety Specifications
Option I
Slope
V
2'O"minimum bench
H
single
H/V-STEEPEST ALLOWABLE SLOPES
H/V=3/4 to 1 In stiff clays less than 12' in height.
H/V=I to 1 In stiff clays greater than 12' in height
H/V= 1 1/2 to 1 In stiff silty clays
H/V=2 to 1 In loose soils or fill material
"Stable Rock" may be cut near vertical
Contractor's "competent person" shall
monitor and verify anticipated soil
conditions as the excavation proceeds.
The contractor may use the benched
method of"slope" however horizontal
and veritical cuts shall be as follows.
3/4:1 H=3 V=4
1:1 H=4 V=4
1 1/2:1 H=4 V=3
2:1 H=4 V=2
NOTES
1. All slopes assume a dewatered condition.
2. All slopes assume sufficient right-of-way exists.
3. All slopes should be flattened an additional .5' if an existing parallel utility line is located
within the horizontal distance equal to the depth of the new utility excavation.
4. Single bench may be used in "Stiff Clays' only and shall not excced 3'6" in height.
5. No spoil or equipment shall be permitted nearer than 2'from the edge of the excavation.
6. Exposed existing utility lines are to be supported.
Page
Trench Safety Specifications
Option II
Trench Shield
V
H
Sloped portions of the excavation shall begin
18" below the top of the trench shield and
conform to guidelines outlined in Option I.
Trench shields may be stacked according to
manufacturer's guidelines for deeper
excavations.
Maximum 2'0" bench will be
allowed in stiff clays only.
MINIMUM SHIELD
CAPACITY
in "PSF"
950
as per tabulated data
Trench Shields shall be inspected and free of structural defects that
may impair their proper function.
The trench shieM shall be used in accordance to manufacturer's
guidelines and recommendations.
Trench shields shall be installed so as to prevent lateral or other
hazardous movement.
Personell shall not be allowed in the trench shield when the shieM is
being installed or removed from the excavation.
Trench Safety Specifications
Option III
Shoring MaximumdepthofcutinType"A"or"B"soilshallbel4'O':
If there ~s evidence of raveling or caving the contractor is
required to use 1 1/8" plywood or 3/4" thick, 14ply, artic
white birch(Finland form).
Plywood is not considered a structural member, and its use is
merely for the prevention of further raveling or caving of the
/ / ::/ Type"AT. soil 6'0"
The contractor's "competent person" shall verify that the shores are in good
working order.
The hydraulic shores shall have a minimum worMng pressure of 750 psi.
Excavated material will not be allowed nearer than 2'from the edge of the
trench, and shall not exceed 4' ~n height.
The contractor shall adhere to the shoring manufacturer's guidelines for use ~n
trench excavations.
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