Grapevine Springs CC-CS080506
TRENCH SAFETY PLAN
UTILITY LINES
COPPEll SERVICE CENTER
(IN AND AROUND BETHEL RD & PARK RD)
COPPEll, TEXAS
FOR
COPPEll SERVICE CENTER
Note: Soil information indicates that a stiff clay (Type liB" soil) will be found on the project site.
The following applies:
H = 3/4 in stiff clay (Type liB" soil or better).
H = 1 or greater in Type "C" soil
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Trench Safety Plan for: N CENTRAL PLUMBING Pg: 101:5
Utility lines Job No: 4694 lOchard Halder P .E.
Coppell SelVice Center Date :06 May 2008 Trench Safety Engineering
833 Rachelte
Coppelt,Texas Scale : As shown Red Oak. Texas 15154
Design: R.H. 1-800-900-9775
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. All cross beams, trench jacks, etc., will 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:
(psf = pounds per square foot; tons/sq ft = tons per square foot)
Type "An... more than 3,000 psf (1.5 tons/sq ft)
Type "B"... more than 1,000 psf (0.5 tons/sq ft) and less than 3,000 psf (1.5 tons/sq ft)
Type "C". ..less than 1 ,000 psf (0.5 tons/sq ft) that is not flowing or submerged.
Trench Safety Plan for: N CENTRAL PLUMBING Pg:20f:5
Utility lines Job No: 4694 Richard Halder P.E.
Coppell Service Center Date :06 May 2008 Trench Safety Engineering
833 Rachelle
Coppell, Texas Scale : As shown Red Oak. Texas 15154
Design: R.H. 1.800.900.9175
Note: Either benched or sloped is acceptable
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As Required
lYPICAl OPEN CUT CROSS SECTION
N.T.S.
Trench Safety Plan
Utitity li n es
Coppell Service Center
Coppell, Texas
for: N CENTRAL PLUMBING
Job No: 4694 chard a der
Date :06 May 2008 Trench Safety Engineering
833 Rachelle
Scale : As shown Red Oak Texas 75154
Design: R.H. 1-800-900-9775
Spaced 6' to 8' o.c. in unweathered limestone.
Spaced .4' o.c. in stiff clay (Type "B" soil) and weathered limestone.
Spaced 4' o.c., in dry Type "e" soli sheeted with 3/...., 14-ply Finland
Birch, or 1-111)" CDX plywood, or approved equal.
'Standard' hydraulic shoring ~
I 4' min. I
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6' max.
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I. As Required ,I
The aluminum hydraulic shoring listed below are just three
examples of trade names of 'standard' hydraulic shoring which
are acceptable. The examples are with a width maximun ofSS"
Speed Shore Hydraulic Shores. model No. V-1-55 or V-5-55,
or V-3.5-55. or equal. Shores may be stacked.
GME Vertical Shores, model No. HVS-l -3455 or HVS-5-3..55,
or HVS-J.5-J455, or equal. Shores may be stacked,
EFFICIENCY PRODUCTION, models No. lX3455-5 or 5)(3455-5,
or 3.5X3455.5 or e ual. Shores ma be stacked.
Also available are Speed Shore "Heavy Duty' shores, which rails run in the 8', 12', and 16' range.
ALTERNATE HYDRAULIC SHORING CROSS SECTION
N.T.S.
Trench Safe Plan
Utility li n es
Coppelt Setvice Center
Coppell, Texas
10' max
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Il As Required ,I
CROSS-SECTION
N.T.S.
Trench Box/shield side wall capacity shall be equal or greater than 420 pst
for Type "B" soil and equal or greater than 600 psffor Type "C" soil. If there
are any changes in soil 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, given above, refers to sidewall capacity of bottom box, in
Type "B" soil, when boxes are stacked. If contractor requires "closed ends" for
trench box, one accaptable method is by placing 314", or greater (or equal)
substitute) steel plate (width size may vary) against spreaders of trench box.
Other methods may be used with approval of Trench Safety Engineer.
Al TERNATE TRENCH BOX CROSS SECTION
N.T.S.
Trench Safe Plan
Utility lines
Coppell Service Center
Coppell, Texas
for: N CENTRAL PLUMBING
Job No: 4694 ic ard a er
Date :06 May 2008 Trench Safety Engineering
833 Rachelle
Scale : As shown Red Oak Texas 75154
Design: R.H. 1-800-900-9775