Res 2024-219 approving an On-Call Agreement with Tetra Tech, Inc., for engineering design, bid and construction phase services for the Wallace Addition Subdivision Improvements Project, in an amount not to exceed $2,000,000.00

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Docusign Envelope ID: BB27E2CA-90E7-44DF-ACD6-60284C2E92F6 oet THE w SGROUP EXHIBIT C DEFINITIONS & DATA LIMITATIONS Subsurface Utility Engineering (SUE) Quality Level Definitions The Rios Group (TRG) performs SUE services in general accordance with the recommended practices and procedures described in ASCE publication ASCE/UESVCI 38-22 "Standard Guideline for Investigating and Documenting Existing Utilities". The core aspect of this standard is affixing a professionally judged value (a Utility Quality Level) to buried and hidden Utility Segments and Utility Features that identify the reliability and nonquantifiable locational uncertainty of documented Utility infrastructure data. The four quality levels, as defined in the standard, are: • Utility Quality Level D (QLD)—A value assigned to a Utility Segment or Utility Feature not visible at the ground surface whose estimated position is judged through Utility records, information from others, or from visual clues such as pavement cuts, obvious trenches, or existence of service. A QLD data attribute is assigned to a Utility Segment or Utility Feature after review and compilation of existing records, oral recollections, One-Call or"private-locate" markings, managed data repositories, context with other achieved Utility Quality Levels, and/or other evidence of existence. QLD data is more uncertain than QLC, QLB, and QLA. QLD data is less uncertain than utilities documented without any Utility Quality Level barring a Professional's statement of fact to the contrary. • Utility Quality Level C (QLC) —A value assigned to a Utility Segment not visible at the ground surface whose estimated position is judged through correlating Utility records or similar evidence to Utility Features, visible aboveground and/or underground. The Utility Anchor Point on the Utility Features shall be tied to the Project Survey Datum with an accuracy of 0.2 ft(60 mm) horizontal. A QLC value judgement is assigned to a Utility Segment by using visible Utility Features to approximate the position of a Utility Segment between or in proximity to the visible Utility Features and in context with other achieved Utility Quality Levels. QLC only pertains to the underground Utility Segment(s), not the Utility Feature(s). QLC data is more certain than QLD and is more uncertain than QLB and QLA • Utility Quality Level B (QLB) — A value assigned to a Utility Segment or Subsurface Utility Feature whose existence and horizontal position is based on Geophysical Methods combined with professional judgement and whose location is tied to the Project Survey Datum. R'd1SR'111~f"1c,e Ut llluir y Illh,111111gi III]eei uiIII]g I Ur'Muillluir'y