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A=COM SEISMIC FLAGGING COLORS Designed to avoid confusion with international Color Code ORANGE GLOW diagonal stripes 2x ORANGE or 50150 Seismic Line location 2D or 3D receiver includes access arrows etc. PINK GLOW diagonal stripes 2x PINK or 50150 Seismic Line location 3D source includes access arrows etc YELLOW GLOW diagonal stripes 2x YELLOW or 50150 Seismic hazard location Red Glow Seismic Source Point location Flagging Pin Flag SEISMIC I Lima Glow Seismic Receiver Paint location Flagging Pin Flag SEISMIC 4.9 Identification and Mapping of Utility and Subsurface Structures 4.9.1 The locations of subsurface utilities and subsurface installations shall be investigated, documented, and shown on a site plan (a scaled site plan shall be used when feasible). Refer to S3AM-331-FM1 Underground Utilities&Subsurface Installation Clearance Checklist. 4.9.2 Documentation of utility and subsurface installation identification (calling one call, responses from utilities)along with the scaled site plan shall be available on the worksite at all times of intrusive activities. 4.10 Site Walk 4.10.1 A site walk shall be conducted by the AECOM Manager and any other appropriate personnel with the objectives of reviewing all planned intrusive activity locations,the locations of subsurface and overhead utilities, overhead obstructions, and the potential for subsurface installations,to determine the appropriate utility clearance activities, and to observe other physical hazards. • Walk the area at least 50 feet(15.2 meters)from perimeter of the site to observe physical hazards. • Walk the area of at least 50 feet(15.2 meters)radius from each proposed subsurface intrusion location. • If possible, particularly at urban and industrial sites,the client/property owner or an individual knowledgeable about the site and site utilities will attend the site walk. • Add discovered items/issues to map for use in location confirmation. 4.10.2 The Site Walk further supplements the Identification and Mapping of Utility and Subsurface Structures procedure. Site Walks should be repeated as necessary following the Identification and Mapping of Utility and Subsurface Structures as visual verification of the hazards. Examples include: • Proposed locations)does not lie on a line connecting two similar manhole covers(e.g. sanitary sewer or storm drain). • Proposed subsurface locations) has not subsided, been excavated and patched, nor gives the appearance it may be covering a former trench (e.g. linear cracks, sagging curbs, linear re-pavements, etc.). • Proposed subsurface location(s)does not lie on a line with any water, gas, electrical meters, utility cleanouts, or other utility boxes in the surrounding areas. Underground Utilities(S3AM-331-PR1) Revision 2 September 30,2020 PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. Page 6 of 8