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Docusign Envelope ID: BB27E2CA-90E7-44DF-ACD6-60284C2E92F6 <br /> Page 2 of 5 <br /> A QLB value is assigned to a Utility Segment when the following conditions are <br /> met: (1) the Utility Segment was detected through the application of appropriate <br /> Geophysical Methods; (2)the geophysical signal was judged to be reliable. (3)the <br /> interpreted position was judged based on knowledge and use of geophysical <br /> science, Utility design and installation practices, available records, visual features, <br /> and influence of site conditions; and (4)the source Designation has been tied to the <br /> Project Survey Datum with an accuracy of 0.2 ft (60mm) horizontally. QLB is <br /> more uncertain than QLA and more certain than QLC or QLD. <br /> • Utility Quality Level A (QLA)—A value assigned to that portion(x-, y-, and z-geometry) <br /> of a Utility Segment or subsurface Utility Feature that is directly exposed and measured <br /> and whose location and dimensions are tied to the Project Survey Datum. The Utility <br /> Segment or subsurface Utility Feature shall be tied to Project Survey Datum with an <br /> accuracy of 0.1 ft (30 mm) vertical and to 0.2 ft (60 mm) horizontal for measurements of <br /> the outside limits of the Utility Feature or Utility Segment that is exposed. <br /> Other measurable, observable, and judged Utility Attributes are also recorded. If <br /> obtained by means of a Test Hole observation, a verification effort is made, and <br /> professional judgement is used to assert that the exposed infrastructure is indeed <br /> the sought target. The assignment of QLA conveys the lowest level of relative <br /> (nonquantifiable) uncertainty of measurable and judged Attributes and locations. <br /> QLA is more certain than QLB, QLC, or QLD. <br /> Acronyms and Special Definitions <br /> 3D three-dimensional <br /> CAD Computer-Aided Design <br /> EOI End of Information <br /> GIS geographic information system <br /> GPR ground penetrating radar <br /> ROE Right of Entry <br /> ROW Right of Way <br /> SAF Surface Adjustment Factor <br /> Anchor Point: A defined point on a Utility Feature or a Utility Segment. (ASCE 38-22) <br /> Attribute: A defined characteristic of a Utility Feature, Utility Segment, or of a singular point on <br /> a Utility Feature or Utility Segment. (ASCE 38-22) <br /> Deliverable: The sealed results from a Subsurface Utility Engineering investigation that typically <br /> includes a Utility Report, Utility Drawings, and other relevant Utility data for inclusion in digital <br /> or paper formats, and/or within databases and/or three-dimensional models. (ASCE 38-22) <br /> Designating: The application and interpretation of shallow earth Geophysical Methods to infer <br /> (with or without surface markings) the existence and the approximate horizontal position and, <br /> R'd1SR'111~f'-1c'e Ut llluir y Illh'111111gi III]eei uiIII]g I Ur'Muillluir'y <br />