SS9301-SP 930503 (3) TRENCH SAFETY
SPECIFICATIONS
FOR
GRAPEVINE CREEK SEWER TRUNK MAIN
........... ' - B4~AlqCH I & II
CONSULTING .ENGINEERS
This cl~eck is only ~or re¥iew of lleher~l confer-
-.,:,-ce with the design concept of th~ project e~d.
~enerat compliance with the information given
the ~ontract documents.
Cc. rre~ior, s or comments made on'the ~op draw;
rags d~r~ng this..revie~ do not relieve co~tractor
.r~'~ complia~,ce with requirements of the con-
tra:: drawins, a.ds,cification,.. C I 7 Y' 0 F
The co~tractor is res~nsibte for confirming end
correlating all quantiti~ a~ dimensions.
~~,~ 2L TEXAS
TREN-TECI-I COMPANY
Trencl3 Satet¥ Tec.~z3ology
25d0 Electronic Ln Suite 104
Dallas, Texas 75220
..................... "': .... '"':"~:::::~ ~:~::':~ ~[Ei~M P.'~.~c~ ....
~'g~-; .....
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 the GRAPEVINE CREEK SEWER TRUNK
MAIN, BRANCH I & II 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 project
drawings and specifications. In accordance with
Revised OSHA effective March 2,1990), prior to
beginning construction, the Contractor's "Competent
Person" will conduct the required Soil Classification
Tests. If soils other than those identified are found,
this specification will be revised. During
construction, the Contractor's "Competent Person" will
monitor he 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 Contractor must identify a "Competent Person" in
the Contractor's 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 It is the Contractor's 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 Contractor's
negligence in performance of contract work, or from
Owner's failure to note exceptions to these
specifications shall remain the sole responsibility and
liabilty 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 par% of this section.
2.2 "Sealing Engineer"- The engineer whose Texas seal is
affixed to these specifications.
2.3 "The Contractor"-The contractor responsible 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.
4.0 SHORING/SLOPING REQUIREMENTS
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
utility owner, or whoever has jurisdiction of the
structure. In all cases, it shall be the
responsibility of the Contractor to protect public and
private property'and any person or persons who might,
as a result of the Contractor's 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
Regulations 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". If there 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 after 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 minimum
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 If a condition requiring the use of a different
method of shoring is encountered, this
specification will be revised.
4.5.10 Remove shoring units from bottom to top as
backfilling proceeds.
4.5.11 When backfill is within five(5) feet of the top of
the trench, all shoring may be removed, unless the
trench conditions indicate a hazard.
4.5.12 No person shall be exposed to the lower portion of
the trench after shoring has been removed.
4.5.13 Additional shoring of larger sizes may be
installed.
4o5.14Ladders or other adequate means of exit must be
provided and located so as to require no more than
twenty-five(25) feet of lateral travel.
4.5.15 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
TRUNK MAIN
5.1 EXCAVATIONS SPECIFIC TO THIS WORK
This project has been outlined in ascending order of plan pages.
SEWER TRUNK MAIN BRANCH I
LOCATION MAX.DEPTH OPTION NOTES
128+10 12.0 I,II CONST MANHOLE &
STUB-OUTS
128+10 TO 126+15 16.0 I,II INSTALL 12" PVC
126+15 17.0 I,II CONST MANHOLE
126+15 TO 124+50 18.5 I,II INSTALL 12"PVC
124+50 18.5 I,II CONST MH\PIT &
301f 24"
124+50 TO 122+30 MICRO TUNNEL
122+30 20.0 I,II CONST MH\PIT
122+30 TO 120+80 19.0 I,II INSTALL 30" PVC
120+80 18.5 I,II CONST MANHOLE
120+80 TO 119+70 17.0 I,II INSTALL 30" PVC
119+70 15.5 I,II CONST MANHOLE
119+70 TO 118+00 14.5 I,II INSTALL 30" PVC
118+00 15.0 I,II CONST MANHOLE &
STUB-OUTS
118+00 TO-115+65 17.5 I,II INSTALL 30" PVC
115+65 18.5 I,II CONST MANHOLE
115+65 TO 114+45 19.0 I,II INSTALL 30" PVC
114+45 20.0 I,II CONST MANHOLE
114+45 TO 113+25 18.5 I,II INSTALL 30" PVC
113+25 19.5 I,II CONST MANHOLE
113+25 TO 112+40 18.5 I,II INSTALL 30" PVC
112+40 19.5 I,II CONST MANHOLE
112+40. TO 108+90 18.5 I,II INSTALL 30" PVC
108+90 18.5 I,II CONST MANHOLE
6
SEWER TRUNK MAIN BRANCH I
LOCATION MAX.DEPTH OPTION NOTES
108+90 TO 107+60 17.5 I,II INSTALL 30" PVC
107+60 18.5 I,II CONST MANHOLE
107+60 TO 106+50 18.5 I,II INSTALL 30" PVC
106+50 20.0 I,II CONST MANHOLE
106+50 TO 105+03 19.5 I,II INSTALL 30" PVC
105+03 20.5 I,II CONST MANHOLE
105+03 TO 104+06 20.0 I,II INSTALL 30" PVC
104+06 21.0 I,II CONST MANHOLE
104+60 TO 103+27 19.5 I,II INSTALL 30" PVC
103+27 19.0 I,II CONST MANHOLE
103+27 TO 102+48 18.0 I,II INSTALL 30" PVC
102+48 17.5 I,II CONST MANHOLE
102+48 TO 101+60 16.5 I,II INSTALL 30" PVC
101+60 16.0 I,II CONST MANHOLE
101+60 TO 99+90 15.0 I,II INSTALL 30" PVC
99+90 22.5 I,II CONST MH\PIT
99+90 TO 95+45 MICRO TUNNEL
95+45 31.5 I,II CONST MH\PIT &
TIE-IN
95+45 TO 89+13 MICRO TUNNEL
89+13 24.5 I,II CONST MH~PIT
89+13 TO 86+25 22.5 I,II INSTALL 30" PVC
86+25 24.0 I,II CONST MH & TIE-IN
86+25 TO 83+24 23.0 I,II INSTALL 30" PVC
83+24 24.5 I,II CONST MANHOLE
83+24 TO 77+43 23.0 I,II INSTALL 30" PVC
77+43 21.5 I,II CONST MANHOLE
77+43 TO 72+26 19.5 I,II INSTALL 30" PVC
72+26 18.0 I,II CONST MH & TIE-IN
72+26 TO 69+70 17.0 I,II INSTALL 30" PVC
69+70 16.5 I,II CONST MANHOLE
69+70 TO 68+30 i4.5 I,II INSTALL 30" PVC
SEWER TRUNK MAIN BRANCH I
LOCATION MAX.DEPTH OPTION NOTES ~
68+30 17.0 I,II CONST MH~PIT & TIE-IN
68+30 TO 66+75 INSTALL BY BORE
66+75 17.5 I,II CONST MH\PIT
66+75 TO 62+42 16.5 I,II INSTALL 30" PVC
62+42 15.0 I,II CONST MANHOLE ---
62+42 TO 58+55 15.0 I,II INSTALL 30" PVC
58+55 16.0 I,II CONST MANHOLE
58+55 TO 55+50 15.5 I,II INSTALL 30" PVC
55+50 17.0 I,II CONST MANHOLE
55+50 TO 52+77 15.0 I,II INSTALL 30" PVC
52+77 15.0 I,II CONST MANHOLE
52+77 TO 48+66 15.0 I,II INSTALL 30" PVC
48+66 15.0 I,II CONST MH & TIE-IN
48+66 TO 44+65 16.5 I,II INSTALL 30" PVC
44+65 16.0 I,II CONST MH & TIE-IN
44+65 TO 42+78 14.0 I,II INSTALL 30" PVC
42+78 15.0 I,II CONST MANHOLE
42+78 TO 41+25 17.5 I,II INSTALL 30" PVC
41+25 18.5 I,II CONST MH\PIT
41+25 TO 37+44 MICRO TUNNEL
37+44 25.0 I,II CONST MH\PIT & TIE-IN
37+44 TO 34+00 MICRO TUNNEL
34+00 27.0 I,II CONST MH\PIT
34+00 TO 30+00 26.0 I,II INSTALL 30" PVC
30+00 22.5 I,II CONST MANHOLE
30+00 TO 26+00 21.0 I,II INSTALL 30" PVC
26+00 20.5 I,II CONST MANHOLE
26+00 TO 22+00 24.0 I,II INSTALL 30" PVC
22+00 22.0 I,II CONST MANHOLE
SEWER TRUNK MAIN BRANCH I
LOCATION MAX.DEPTH OPTION NOTES
22+00 TO 18+00 20.0 I,II INSTALL 30" PVC
18+00 14.0 I,II CONST MANHOLE
18+00 TO 14+00 12.0 I,II INSTALL 30" PVC
14+00 9.0 I,II CONST MANHOLE
14+00 TO 10+00 7.5 I,II INSTALL 30" PVC
10+00 8.0 I,II CONST MANHOLE
10+00 TO 9+65 6.0 I,II INSTALL 30" PVC
9+65 8.0 I,II CONST MANHOLE
9+65 TO 6+00 9.5 I,II INSTALL 30" PVC
6+00 11.0 I,II CONST MANHOLE
6+00 TO 3+38 12.5 I,II INSTALL 30" PVC
3+38 17.5 I,II CONST M~\PIT
3+38 TO 2+08 INSTALL BY BORE
2+08 18.0 I,II CONST MANHOLE
2+08 TO 0+40 16.0 I,II INSTALL 30" PVC
0+40 15.5 I,II CONST MANHOLE
0+40 TO 0+00 14.0 I,II CONN TO EXIST MH
SEWER TRUNK MAIN BRANCH II
LOCATION MAX.DEPTH OPTION NOTES
48+20 11.5 I,II CONST MANHOLE
48+20 TO 45+35 11.0 I,II INSTALL 24" PVC
45+35 8.0 I,II CONST MANHOLE
45+35 TO 43+15 14.0 I,II INSTALL 24" PVC
43+15 15.0 I,II CONST MANHOLE
43+15 TO 41+35 21.5 I,II INSTALL 24" PVC
41+35 19.0 I,II CONST MANHOLE
41+35 TO 40+00 20.0 I,II INSTALL 24"PVC
40+00 25.0 I,II CONST MH\PIT
40+00 TO 38+40 INSTALL BY BORE
38+40 18.5 I,II CONST MH\PIT
38+40 TO 38+17 17.5 I,II INSTALL 24" PVC
38+17 16.5 I,II CONST MANHOLE
38+17 TO 34+27 16.0 I,II INSTALL 24" PVC
34+27 10.5 I,II CONST MANHOLE
34+27 TO 31+50 9.0 I,II INSTALL 24" PVC
31+50 6.0 I,II CONST MANHOLE
31+50 TO 29+95 11.0 I,II INSTALL 24" PVC
29+95 12.0 I,II CONST M~NHOLE
29+95 TO 28+89 16.0 I,II INSTALL 24" PVC
28+89 16.0 I,II CONST MANHOLE
28+89 TO 25+50 17.0 I,II INSTALL 24" PVC
25+50 14.5 I,II CONST MkNHOLE
25+50 TO 21+10 21.5 I,II INSTALL 24" PVC
21+10 17.5 I,II CONST MANHOLE
21+10 TO 17+08 25.0 I,II INSTALL 24" PVC
17+08 26.5 I,II CONST MANHOLE
17+08 TO 16+15 25.5 I,II INSTALL 24" PVC
16+15 22.0 I,II CONST MH~PIT
10
SEWER TRUNK MAIN BRANCH II
LOCATION MAX.DEPTH OPTION NOTES
16+15 TO 15+67 INSTALL BY BORE
15+67 21.5 I,II CONST MH~PIT
15+67 TO 12+17 27.0 I,II INSTALL 24" PVC
12+17 28.5 I,II CONST MANHOLE
12+17 TO 10+17 29.5 I,II INSTALL 24" PVC
10+17 30.5 I,II CONST MANHOLE
10+17 TO 6+30 29.0 I,II INSTALL 24" PVC
6+30 18.0 I,II CONN TO EXIST 24"
38+17 16.5 I,II INSTALL 18" PVC
CONST M~ OVER EXIST
12" SS, INSTALL 101f
18" STUB-OUT
Trench Safety Specifications
Option I
Slope
~ method of"slope" however horizontal
and veritical cuts shall be as follows.
Single Bench 3 4.'1 H=3
1.'1 H=4 V=4
/ I 1-'2:1 H=4 V=3
2:1 H=4
H/V-STEEPEST ALLOWABLE SLOPES
H I'=3 4 to I In stqTclm-'s less than 12' in height.
H V-I to I In st~_tTcl~.'s greater than 12'm height
H V= 1 I 2 to I In st~ffsilO' cl~.'s
H V.. 2 to I In loose soils orfill material
",¥table Rock" ma3' be cut near vertical
NOTES
1. All sMpes assume ct de~ atered condttion.
2. Ail slopes assume .~'t~[ficient rtght-of-wm-, exists.
3. ,4 I1 slopes shouM he flattened an additional. 5' if an existing parallel utiliO' line ts located
within the hortzontal distance equal to the depth of the new utiliO: excavation.
4. Single bench mm.' be uxed in "Sti.[J'CIm.'s " only and shall not exceed 3'6" in height.
5. N'o spoil or equtpment shall be permitted nearer than 2'from the edge of the exccn'ation.
6. Exposed existing ut~htv lines are to be supported
· Page ·
Trench Safety Specifications '
Option ]!
Trench Shield
........ ~:~:~.>: Trench shields ma)' be stacked according to
Sloped portions of the excavation shall begin :.~?-.. ~:::~:~:
18" below the top of the trench shield and
conform to guidelines outlined in Option I.
?~::':' [ ~aximum 2'0" bench will be
allowed in stiff cla),s only.
MINIMUM SHIELD
CA PA CITY Trench Shiel& shall be inspected and free of structural defect.; that
mm.' impair their proper function.
in "I'S/:" Ihe trench shield shall be used in accordance to manufacturer ~
guidehnes and recommendations.
I .9 ..9 [I Trench sh,elds shall be installed so as to prevent lateral or other
ha2ardous movement.
a.q t~er tabulated data Personell shall not he allowed in the trench shield when the shteld is
being installed or removed from the excavation.
Trench Safety Specifications
Option III
Shoring .~lctx~murndepthofcutinType'gl"or"B"soilshallbel4'O':
If there is evidence of raveling or cm'ing the contractor is
required to use I 1 ~8" p~'ood or 3 4" thick. 14 ply. artic
white birch~inl~d fo~/.
'PI)~'~d ~s not co~de~d a stmcmral ~mber. ~d ~ts use ~s
~ /~ / ~ ~re~for the pr~ennon of~rther r~eling or c~'ing of the
~ ~ ~ ] ~ t~nch wall.
// ~,~e"~",o,,
~4C~D SHO~ S~ ~E ~'0"
17re contractor's "competent person" shah verify that the shores are in good
~'orking order. ...
lhe Io'draulic shores shah hcn'e a rn~nirnum working pressure of 750 I~i. '
Excctvated material will not be allowed nearer than 2'from the edge of the
trench, and shah not exceed 4' in height.
Ihe contractor shah adhere to the shoring manufacturer's guidelines for use tn
lt,'Itch excavattot~.
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