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A=COM 4.6.5 Warning tape, pea gravel, sand, non-indigenous material, bentonite, red concrete(indicative of electrical duct banks)and any departure from native soil or backfill may be evidence of the presence of subsurface installations and utilities. 4.7 Surface Markings 4.7.1 Once the underground installation has been identified, proper surface markings shall be made in accordance with the guidelines from the One-Call System (refer to S3AM-331-ATT1 ), guidance contained in this procedure or as contract-specified. 4.7.2 Color-coded surface marks(paints or similar coatings)shall be used to indicate the type, location, and route of buried installations.Additionally, to increase visibility, color-coded vertical markers (temporary stakes or flags)shall supplement surface marks. 4.7.3 All marks and markers shall indicate the name, initials, or logo of the company that owns or operates the installation and the width of the installation if it is greater than 2 inches. 4.7.4 If the surface over the buried installation is to be removed, supplemental offset marking shall be used. Offset markings shall be on a uniform alignment and shall clearly indicate that the actual installation is a specific distance away. 4.7.5 Locate marks shall be re-verified as per jurisdictional requirements or no later than 14 days after the previous locate was completed,whichever interval is shorter. These locate time intervals shall be maintained for the duration of the ground disturbance. • If the work is interrupted during the determined lifespan or work does not commence during the applicable lifespan, a new locate shall be performed. • Jurisdictional provisions may allow for an extension to the lifespan of the locate marks, however certain conditions may need to be met. (e.g. activities uninterrupted) • If locate marks are moved or destroyed the location of the buried facilities shall be re- established. 4.8 Uniform Color Coding 4.8.1 The colors and corresponding installation type are as follows unless otherwise contract-specified: AMERICAN PUBLIC WORKS ASSOCIATION—APWA Color Coding for Marking of Buried Facilities White Proposed Ground Disturbance Area Pink Temporary Survey Markings Red Ele Yellow Gas,Oil,Steam, Petroleum Lines or Gaseous Materials Orange Conduit,Cable,Communication,Alarm or Signal Lines Potable Water MWeclaimed Water,Irrigation and Slurry Lines . . Canadian Association of Geophysical Contractors Underground Utilities(S3AM-331-PR1) Revision 2 September 30,2020 PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. Page 5 of 8