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SS9301-SP 930503 (5)
TRENCH SAFETY SPECIFICATIONS FOR GRAPEVINE CREEK SEWER TRUNK MAIN BRANCH I & II GINN INC. CON,~UL'TING ENGINEERS This check i~ onlY' for review of general confor- ~,l~l-ce with the design concePt of the project and ge0era[ c~)mpli~r, ce with tl~e informatioa given in tl~e contract 'dOcuments. C0'rrecti0n~'0r Comments m~de on the ~3Tray- ! O F ings during this ,evlew do not relieve contractor ~r.~m c~p~ia~c~' with requirements of the con- ~ ~""~ '.'~"~'~'~0 pp ELL TExAs corre:'ati.g all quantities and dimensions. ExceptiOns Taken ~ Make Correcl~_l~ Re/ected [-~ Revise & Resubmit $~hr~t, Specified Items K E N KO for: SHOP ,71, :'" ": ;'!'~S OECN REVIEWED TR EH- TECH COMPA N Y Trench Salety Tecg~ology 2560 Electronic Ln $[~lte 104 Dallas, Texas 75220 have rev!eweO this Tren,:rt Safety Plan and find thal Its rec©mmenda~lons and pr:.cedures conlorm to OSHA guidelines ar;d regulations The cu~culal~or, s herein are consistent with generally accepted eng~neerlr~g 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 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 Ail 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 "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 Ail 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 provid~ a positive means of ensuring that hydrostatic pressure does not build up behind the shoring or shields. 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. 4.5.14Ladders 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 128+10 12.0 OPTION I,II 128+10 TO 126+15 16.0 I,II 126+15 17.0 I,II 126+15 TO 124+50 18.5 I,II 124+50 18.5 I,II 124+50 TO 122+30 122+30 20.0 I,II 122+30 TO 120+80 19.0 I,II 120+80 18.5 I,II 120+80 TO 119+70 17.0 I,II 119+70 15.5 I,II 119+70 TO 118+00 14.5 I,II 118+00 15.0 I,II 118+00 TO-115+65 17.5 I,II 115+65 18.5 I,II 115+65 TO 114+45 19.0 I,II 114+45 20.0 I,II 114+45 TO 113+25 18.5 I,II 113+25 19.5 I,II 113+25 TO 112+40 18.5 I,II 112+40 19.5 I,II 112+40. TO 108+90 18.5 I,II 108+90 18.5 I,II NOTES CONST MANHOLE & STUB-OUTS INSTALL 12" PVC CONST MANHOLE INSTALL 12"PVC CONST MH\PIT & 301f 24" MICRO TUNNEL CONST MH\PIT INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONSTMANHOLE INSTALL 30" PVC CONST MANHOLE & STUB-OUTS INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE SEWER TRUNK MAIN BRANCH I LOCATION MAX.DEPTH OPTION 108+90 TO 107+60 17.5 I,II 107+60 18.5 I,II 107+60 TO 106+50 18.5 I,II 106+50 20.0 I,II 106+50 TO 105+03 19.5 I,II 105+03 20.5 I,II 105+03 TO 104+06 20.0 I,II 104+06 21.0 I,II 104+60 TO 103+27 19.5 I,II 103+27 19.0 I,II 103+27 TO 102+48 18.0 I,II 102+48 17.5 I,II 102+48 TO 101+60 16.5 I,II 101+60 16.0 I,II 101+60 TO 99+90 15.0 I,II 99+90 22.5 I,II 99+90 TO 95+45 95+45 31.5 I,II 95+45 TO 89+13 89+13 24.5 I,II 89+13 TO 86+25 22.5 I,II 86+25 24.0 I,II 86+25 TO 83+24 23.0 I,II 83+24 24.5 I,II 83+24 TO 77+43 23.0 I,II 77+43 21.5 I,II 77+43 TO 72+26 19.5 I,II 72+26 18.0 I,II 72+26 TO 69+70 17.0 I,II 69+70 16.5 I,II 69+70 TO 68+30 14.5 I,II NOTES INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MH\PIT MICRO TUNNEL CONST MH\PIT & TIE-IN MICRO TUNNEL CONST MH\PIT INSTALL 30" PVC CONST MH & TIE-IN INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MH & TIE-IN INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC SEWER TRUNK MAIN BRANCH I LOCAT I ON MAX · DEPTH 68+30 17.0 68+30 TO 66+75 66+75 17.5 66+75 TO 62+42 16.5 62+42 15.0 62+42 TO 58+55 15.0 58+55 16.0 58+55 TO 55+50 15.5 55+50 17.0 55+50 TO 52+77 15.0 52+77 15.0 52+77 TO 48+66 15.0 48+66 15.0 48+66 TO 44+65 16.5 44+65 16.0 44+65 TO 42+78 14.0 42+78 15.0 42+78 TO 41+25 17.5 41+25 18.5 41+25 TO 37+44 37+44 25.0 OPTION I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II I,II 37+44 TO 34+00 34+00 27.0 I,II 34+00 TO 30+00 26.0 I,.II 30+00 22.5 I,II 30+00 TO 26+00 21.0 I,II 26+00 20.5 I,II 26+00 TO 22+00 24.0 I,II 22+00 22.0 I,II NOTES CONST MH\PIT & TIE-IN INSTALL BY BORE CONST MH\PIT INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MH & TIE-IN INSTALL 30" PVC CONST MH & TIE-IN INSTALL 30" PVC CONSTMANHOLE INSTALL 30" PVC CONST M~PIT MICRO TUNNEL CONST M~\PIT & TIE-IN MICRO TUNNEL CONST MH\PIT INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE SEWER TRUNK MAIN BRANCH I LOCATION MAX.DEPTH OPTION 22+00 TO 18+00 20.0 I,II 18+00 14.0 I,II 18+00 TO 14+00 12.0 I,II 14+00 9.0 I,II 14+00 TO 10+00 7.5 I,II 10+00 8.0 I,II 10+00 TO 9+65 6.0 I,II 9+65 8.0 I,II 9+65 TO 6+00 9.5 I,II 6+00 11.0· I,II 6+00 TO 3+38 12.5 I,II 3+38 17.5 I,II 3+38 TO 2+08 2+08 18.0 I,II 2+08 TO 0+40 16.0 I,II 0+40 15.5 I,II 0+40 TO 0+00 14.0 I,II NOTES INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MANHOLE INSTALL 30" PVC CONST MH\PIT INSTALL BY BORE CONST MANHOLE INSTALL 30" PVC CONST MANHOLE CONN TO EXIST MH SEWER TRUNK MAIN BRANCH II LOCATION MAX.DEPTH OPTION 48+20 11.5 I,II 48+20 TO 45+35 11.0 I,II 45+35 8.0 I,II 45+35 TO 43+15 14.0 I,II 43+15 15.0 I,II 43+15 TO 41+35 21.5 I,II 41+35 19.0 I,II 41+35 TO 40+00 20.0 I,II 40+00 25.0 I,II 40+00 TO 38+40 38+40 18.5 I,II 38+40 TO 38+17 17.5 I,II 38+17 16.5 I,II 38+17 TO 34+27 16.0 I,II 34+27 10.5 I,II 34+27 TO 31+50 9.0 I,II 31+50 6.0 I,II 31+50 TO 29+95 11.0 I,II 29+95 12.0 I,II 29+95 TO 28+89 16.0 I,II 28+89 16.0 I,II 28+89 TO 25+50 17.0 I,II 25+50 14.5 I,II 25+50 TO 21+10 21.5 I,II 21+10 17.5 I,II 21+10 TO 17+08 25.0 I,II 17+08 26.5 I,II 17+08 TO 16+15 25.5 I,II 16+15 22.0 I,II NOTES CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24"PVC CONST MH~PIT INSTALL BY BORE CONST MH\PIT INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MH\PIT l0 SEWER TRUNK MAIN BRANCH II LOCATION MAX.DEPTH OPTION 16+15 TO 15+67 15+67 21.5 I,II 15+67 TO 12+17 27.0 I,II 12+17 28.5 I,II 12+17 TO 10+17 29.5 I,II 10+17 30.5 I,II 10+17 TO 6+30 29.0 I,II 6+30 18.0 I,II 38+17 16.5 I,II NOTES INSTALL BY BORE CONST MH\PIT INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONST MANHOLE INSTALL 24" PVC CONN TO EXIST 24" INSTALL 18" PVC CONST MH OVER EXIST 12" SS, INSTALL 101f 18" STUB-OUT - Trench Safety Specifications Option I Slope Spoil Material 2'0" min. V 2'O"minimum bench Single Bench - H/V-STEEPEST ALLOWABLE SLOPES H,V=3/4 to 1 In stiffclays less than 12' in height. H/V= I to 1 ln st~ff clays greater than 12' m height H/V=I 1/2 to I In stiff silty clays ft/V=2 to I 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 I 1/2:1 H=4 V=3 2:1 H=4 I7=2 NOTES 1. All slopes assume a dewatered condition. 2. All slopes assume sq~cient right-of-way exists. 3. A II slopes should be flattened an additional.5' if an existing parallel uti#ty line is located within the horizontal distance equal to the depth of the new utility excavation. 4. Single bench may be used m "Stiff Ctays" only and shall not excced 3'6" in height. 5. No spoil or equtPment shall be permitted nearer than 2'from the edge of the excavation. 6. Exposed existing utdm. , lines are to be supported. Page Trench Safety Specifications Option H Trench Shield Sloped portions of the excavation shall begin 18" below the top of the trench shield and conform to guidelines outlined in Option I. allowed in stiff clays only. MINIMUM SHIELD CAPACITY in "PSF" 1530 a.s per tabulated data Trench Shields shah 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. PersoneH shah not be allowed in the trench shieM when the shield is being installed or removed from the excavation. Trench Safety Specifications Option III Shoring Ma~irnum depth of cut in Type ".4" or "B" soil shall be 14'0': lf there is evidence of raveltng or caving the contractor is required to use I 1/8" plywood or 3/4" thick, 14 pi),, artic white birch(Finland form). 'Plywood is not considered a structural member, and its use is mere!~ for the prevention of further raveling or caving of the trench wail. MAXIMUM HORIZONTAL SPACING "A" FOR SINGLE SHORES Type ~A "soil 6'0 ' Type "B" soil 5'0" MAXZMLrM HORIZONTAL SPACING "~ ~ FOR DOUBLE STACKED SHORES SHALL BE 4'0" The contractor's "competent person" shall verify that the shores are in good working order. ..... ....... lhe Io,draulic shores shah have a minimum working presa'ure of 750 tnvk - ,tL~cavated material wlH not be allowed nearer than 2'from the edge of the trench, and shah not exceed 4' in height. The contractor shah adhere to the shoring manufacturer's guidelines for use tn trench excavation&