Trench safety design TRENCH SAFETY DESIGN PLAN
Water, Sanitary, and Storm Sewer Construction
Eastlake Addition
Located South Side of SH 121 Approximately 1500 LF West of Denton Tap Road
City of Coppell, Dallas County, Texas
December 12, 2013
Prepared for: KCK Utility Construction
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TRENCH SAFETY PLAN
EASTLAKE ADDITION COPPELL,TX
DRAWN BY SCALE DATE PROJ. NO. SHEET NO.
K.R. N.T.S. 12-12-13 KCK-145 1 of 5
GENERAL NOTES
1. For any trench excavations exceeding five(5')feet in depth,the contractor shall
conform to current OSHA standards for excavations, trenching, and shoring.
2. Trench safety details shown are for general trenching installation. If details
shown are not feasible due to specific field conditions, contractor shall notify
engineer immediately for alternate design.
3. Design slopes shown herein reflect maximum slopes allowable by OSHA and
engineer design. Contractor shall consult engineer if slopes shown are not
feasible.
4. Trenches are designed for short term use(less than 24 hours). If field conditions
change due to rain,water seepage into trench walls, or any other potentially
hazardous situation,contractor shall inspect or contact engineer for evaluation.
5. Trench boxes or other approved shoring devices shall be installed from outside
the trench by starting at the top of the trench working down. Cross members such
as beams or jacks must be placed 90 degree angles to box walls in a true
horizontal position. Removal shall begin at the bottom of the trench working up.
6. When using a trench box or other shoring device,workers shall remain in the
confines of the device while performing duties within the trench to avoid
potential injury or loss of life.
7. Per OSHA, soils are classified into four groups based on unconfined compressive
strength; solid rock, Type A (greater than 3,000 psf), Type B (1,000-3,000 psf), or
Type C (less than 1,000 psf). When in doubt assume soil type to be Type C.
8. Contractor shall provide an access (i.e. ladder)for every 25 horizontal feet of
travel within trench.
9. Spoil materials shall be kept a minimum of two (2') feet from trench edge.
10. Contractor shall consult with engineer regarding alternative design procedures
and methods.
11. Shoring and other safety mechanisms should be frequently inspected for any
damage. Any damaged components or systems shall be immediately replaced.
12. For trench depths greater than 20' in depth, contractor shall verify with
manufacturer that depth in question is consistent with the manufacturer's
tabulated data, specifications, recommendations, and limitations per OSHA
Option 2, under §1926.652(c)(2).
Based on 12 foot maximum depth and information provided by the Contractor/Client, it
is determined that soils on the project site primarily consist of stiff clays to be
considered as Type B material. Limestone is typically found in the area as well.
However, limestone often contains fissures and cavities filled with clay thus limiting its
strength and stability. Trench wall slopes (V:H)are noted as 1:H where:
H = 3/4 (Type A soils)
H = 1 (Type B soils)
H = 1 % (Type C soils)
Open Cut methods are suitable in most install applications. Alternate sections for
hydraulic shoring and trench box/shield applications are also shown and to be used at F-10826
the Contractor's discretion. Manufacturer's specifications for hydraulic shoring,trench
box/shield, slide rails, or any other"standard" shoring device should always be
reviewed for limitations prior to use. ; RCP, It
TRENCH SAFETY PLAN
EASTLAKE ADDI1 ION-COPPEI..I.,'IX
DRAWN BY SCALE DATE PROJ. NO. SHEET NO.
RR. N .S. 12-12-13 KCK-145 2 OF 5
Spoil Material
/; / 10' Max.
2' Min. ///\/,,,,,./1:
_
H j -
- .
.
— ( 4 Max.
Width As Needed
Notes: Trench may be benched or sloped.
Dimension "H" is determined by soil type.
Spoil Material
10' Max.
2' Min. //z/,,,,,/,,,://:/
V/i/////;
H '`
1
H
1
I4 Max.
Width As Needed
Note: Differing soil strata may require sloping variations.
GRIN CUT S -CTIO \ S (TYPICAL)
NOT TO SCALE
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TRENCH SAFETY PLAN
EASTLAKE ADDfrION-COPPELL,TX
DRAWN BY SCALE DATE PROD. NO. SHEET NO.
R.R. N.T.S. 12-12-13 KCK-145 3 or 5
I
Spoil Material
Hydraulic Shoring Device ,/,/, 10' Max.
2' Min i �,
11 - -
_ 4 Max.
Width As Needed
Notes: Dimension "H" is determined by soil type
TRENCH BOX NOTES:
1— Side wall capacity shall meet or exceed 584 psf in Type "B"
soils and 696 psf for Type "C" soils.
2— When stacking trench boxes, sidewall capacity is based on the
bottom box.
3— 3/4" minimum steel plate placed against spreaders of the
trench box may be used for closed ends.
TR \ CH BOX ALT=RNAT-
NOT TO SCALE
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TRENCH SAFETY PLAN
EASTLAKL ADDI1 ION t OPPI I L,"IX
DRAWN BY SCALE DATE PROD. NO. SHEET NO.
R . N.T.S. 12-12-13 KCK-145 4 of 5
_ I
Spoil Material
Hydraulic Shoring Device //,/ 6' Max.
4' Min. �i1
_ — _ - Per manufacturer specs.
2' Max. -
Width As Needed
HYDRAULIC SHORING NOTES:
1- 6' TO 8' O.C. spacing in unweathered limestone
2- 4' O.C. spacing in Type "B" soils & weathered limestone
3- 4' O.C. spacing in Type "C" soils with 3/4" 14-ply Birch or
1-1/8" CDX plywood sheeting.
HYDRAULIC S - ORI \ G ALTERNATE
NOT TO SCALE
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TRENCH SAFETY PLAN
EAS 1 LAKP.ADDITION-COPPER„TX
DRAWN BY SCALE DATE PRO. NO. SHEET NO.
R.R. N.T.S. 12-12-13 KCK-145 5 OF 5