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Subsurface Utility Clearance <br /> Management Program 2.9 <br /> Appendix A- Definitions <br /> Intrusive Work Activities All activities such as digging or scraping the surface, including but not <br /> limited to, excavation, test pitting or trenching, soil vapor sampling or the <br /> installation of soil borings, soil vapor monitoring points and wells, or <br /> monitoring wells, and drilling within the basement slab of a recently <br /> demolished building. <br /> Mark-out/Stake Out The process of contracting with a competent and qualified company to <br /> confirm the presence or absence of underground utilities and structures. <br /> This process will clearly mark-out and delineate utilities that are identified <br /> so that intrusive work activities can be performed without causing <br /> disturbance or damage to the subsurface utilities and structures. After <br /> utility mark-outs are completed the soft digging will be completed prior to <br /> intrusive work. <br /> Tolerance Zone Defined as two feet on either side of the designated centerline of an <br /> identified utility, plus half of the diameter or half of the greatest dimension <br /> (for elliptical sewers, duct backs and other non-cylindrical utilities) of that <br /> utility and two feet from the outside edge of any subsurface structure. <br /> Structure For the purpose of this program a structure is defined as any underground <br /> feature that may a present potential source(s) of energy such as, but not <br /> limited to, utility vaults, bunkers, piping, electrical boxes, wires, conduits, <br /> culverts, utility lines, underground tanks and ducts. <br /> Soft Digging The safest way to remove material from unknown obstructions or services <br /> is by using tools such as a vactor or air knife, non-mechanical tools, or <br /> hand tools. The methods are clean and non-evasive and used for <br /> uncovering and exposing buried services, excavating and for providing a <br /> quick method of soil removal from sensitive areas. <br /> Verification Exploratory test-hole dug with hand tools within the Tolerance Zone to <br /> expose and verify the location, type, size, direction-of-run and depth of a <br /> utility or subsurface structure. Vacuum excavation (soft dig) methods can <br /> further facilitate exposure of a subsurface utility and accurately provide its <br /> location and identification prior to intrusive work approaching the <br /> Tolerance Zone. <br /> 1/2019 Corporate Health and Safety Management Program I ROUX 11 <br />