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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX F<br />

Trenches shall be reinspected prior to re-entry after water accumulation due to heavy rainfall<br />

or seepage.<br />

4.5.11.3 Stability of Adjacent Structures<br />

When excavating or trenching near an adjacent structure the following practices shall be implemented.<br />

Support systems such as shoring, bracing, or underpinning shall be provided where the<br />

stability of buildings, walls, or other structures is endangered by excavation.<br />

Excavation bases or footings of foundations shall be prohibited unless support systems are<br />

used, the excavation is in stable rock, a professional engineer has determined the structure is<br />

sufficiently removed from the site as to not pose a hazard, or the PE determines that the<br />

excavation shall not pose a hazard to employees due to the structure.<br />

Support systems shall be used when it is necessary to undermine sidewalks, pavements, and<br />

appurtenant structures.<br />

Surcharge load sources and adjacent encumbrances shall be listed with their evaluation date<br />

on the daily inspection checklist.<br />

4.5.11.4 Daily Inspections<br />

Inspections shall be performed daily on all excavations, adjacent areas, and protective systems before<br />

personnel enter the trench. A checklist will be used.<br />

4.5.11.5 Soil Classification<br />

To perform soil classification, the competent person shall use a thumb test, pocket penetrometer, or shear<br />

vane to determine the unconfined compressive strength of the soils being excavated. In soils with<br />

properties that change (i.e., one soil type mixed with another within a given area) several tests may be<br />

necessary. When different soil types are present the overall classification shall be that of the type with the<br />

lowest unconfined compressive strength. Classifications shall result in a soil rating of Stable Rock, Type<br />

A, Type B, or Type C in accordance with 29 CFR 1926.652. Soil classifications shall be listed on the<br />

daily inspection checklist. The soils analysis checklist will be used for soil classifications.<br />

4.5.11.6 Sloping and Benching<br />

All sloping and benching shall be done in accordance with 29 CFR 1926.652, Appendix B. Selection of<br />

the sloping method and evaluation of surface surcharge loads shall be made by a competent person<br />

familiar with the requirements contained therein. Sloping and benching methods and specifications shall<br />

be listed on the daily inspection checklist.<br />

4.5.11.7 Protective Systems<br />

Protective systems are required on all excavations over five ft in depth or in excavations less than five ft<br />

when examination of the ground by a competent person reveals conditions that may result in cave-ins.<br />

Selection and installation of protective systems shall be done in accordance with 29 CFR 1926.652,<br />

Appendices C & D, or manufacturers data for shoring and shielding systems. Selection of a protective<br />

system shall be made based upon soil classification and job requirements by a competent person.<br />

Protective systems and specifications shall be listed on the daily inspection checklist. Protective systems<br />

Kirtland AFB<br />

Base-Wide Health and Safety Plan F-44 April 2004

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