Duke Lesley 1A-CS070919 (3)
TRENCH SAFETY PLAN
UTILITY LINES
POINT WEST VI
(IN AND AROUND IH 635 & BEL TUNE RD)
COPPEll, TEXAS
FOR
DUKE CONSTRUCTION
Note: Soil information indicates that a stiff clay (Type uB" soil) will be found on the project site.
The following applies:
H = 3/4 in stiff clay (Type liB" sailor better).
H = 1 or greater in Type "C" soil
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Trench Safety Plan
Utility lines
Point West VI
Coppell,Texas
for: SAN SABA CONSTRUCTION
Job No:4398 r a 8f . .
Date : 19 Sep 200 rench Safety Engineering
833 Rachelle
Scale : As shown Red Oak. Texas 15154
Design: R.H. UOJ.900-9175
GENERAL NOTES
1. For all excavations of trenches, which will exceed a depth of five feet, the Contractors
trench safety procedures shall meet the current standards established by OSHA on
excavations, trenching, shoring, and confined spaces, all of which are incorporated
herein by reference.
2. If details shown are not feasible due to unanticipated conditions, the Contractor shall
notify the Trench Safety Engineer for re-evaluation.
3. These drawings assume all excavated areas remain free of water seepage or intrusion.
Excavations shall be inspected after every storm or other hazard-increasing occurrence
to assure the continued safety of the trench. The Contractor shall seek guidance from
the Trench Safety Engineer where needed.
4. When installing a support system, shoring will be applied by starting at the top of the
trench excavation and working downward. Atl cross beams, trench jacks, etc., win be
placed in a true horizontal position. Support system removal shall begin at the bottom
and proceed upward, performed from outside the trench.
5. Materials used for sheeting, sheet piling, bracing, shoring, etc., shall be in good
serviceable condition. Timbers used shall be sound and free from large or loose knots
and shall be designed and installed so to be effective to the bottom of the excavation.
6. Alternate design for use of steeper slopes of the use of supporting systems, i.e., piling,
cribbing, shoring, etc., may be submitted by the Contractor for evaluation by the Trench
Safety Engineer.
7. Slopes shown shall be the maximum unless changed by the Trench Safety Engineer
due to changing soil conditions. Slopes shown are for a short-term period. If
excavations are open for more than 24 hours, the Trench Safety Engineer shall be
contacted for evaluation.
8. Cohesive soils are classified by their unconfined compressive strength, as follows:
(pst := pounds per square foot; tons/sq ft = tons per square foot)
Type "A"... more than 3,000 psf (1.5 tonslsq ft)
Type "B"... more than 1,000 pst (0.5 tons/sq ft) and less than 3,000 pst (1.5 tons/sq ft)
Type "C",..less than 1 ,000 psf (0.5 tonslsq ft) that is not flowing or submerged.
Trench Safety Plan
UtIlity Lines
Point West VI
Cuppell, Texas
P:2of:5
Job No: 4398 ichard Ha er . .
Date : 19 Sep 2007 Trench Safety Engineering
833 Rachelle
Scale : As shown Red Oak Texas 75154
Design: R.H. 1.800.soO..9n5
Note: Either benched or sloped is acceptable
10' max.
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H
As Required
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lYPlCAL OPEN CUT CROSS SECllON
N.T.S.
Trench Safety Plan
Utility lines
Point West VI
(oppel!. Texas
Spaced 6' to 8' o.c. in unweathered limestone.
Spaced 4" o.c. In stiff clay (Type ''8"" solq and we lithe red limestone.
Spaced 4' O.C., in dry Type He- soil sheeted with 3/4", 14-ply Finland
Birch. Of 1-118- COX plywood, or approved equal.
'Standard' hydraulic shoring ~
6' max.
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16'max.
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I, As Required ~
The aluminum hydraulic shoring listed below are just three
examples of trade names of 'standard' hydraulic shoring whidl
are acceptable. The exam pi" are with 8 width maximun 0155"
Speed Shore Hydraulic Shores. model No. V-7-55 or V-5-55,
or V-l.5-55. or equal. Shores may be stacked.
GillE Vertical Shores, model No. HVS-7 -3455 Dr HVS-5-3455,
or HVS.3.5-3455, or equal. Shores may be stacked.
EFFIOENCY PRODUCTION, models No. 1X3455-S or 5X3455.5,
or 3.5XJ455.S or e ual. Sores m be stacked.
AIsommllable are Speed Shore 'Heavy Duty" shores, which rails run in the 0', 12", and 16" .,.ng8.
At TERNATE HVPRAUUC SHORING CROSS ~CTlON
N.T.~.
Trench Safety Plan
Utility Lines
Point West VI
Coppell, TeKftS
for: SABA CONSTRUCTION P : 4 ot. 5
Job No:4398 Richard Halder .E.
Date : 19 Sep 2007 rench Safety Engineering
833 Ramelle
Scale : As shown Red Oak Texas 15154
Design: R.H. 1-800.000-9115
10' max
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<4'm_[
14 As Required ,I
CROSS-SECTION
N.T.S.
Trench Box/shield side wall capacity shall be equal or greater than 350 pst
for Type IISII soil and equal or greater than 500 psffor Type IIC" soil. If there
are any changes in soli conditions, the Trench Safety Engineer shall be
contacted for evaluation.
Any manufactured/rated trench shield system, such as Manhole Rings, Modular
Shields, Panel Shields, etc. are included in this catagory.
Trench box capacity refers to sidewall capacity of bottom box when boxes are
stacked. If contractor requires "closed ends" for trench box, one acceptable
method is by placing 314", or greater (or equal substitute) steel plate (width
size may varry) against spreaders of trench box. Other methods may be used
with the approval of Trench Safety Engineer.
At TERNATE TRENCH BOX CROSS SECTION
N.T.S.
Trench Sat Plan
lhillty Lines
Point West VI
Coppell,Texas