Specs - ASCE_UESI_CI 38-22 .pdf

ASCE STANDARD ASCE/UESI/CI

38-22

Standard Guideline for Investigating and Documenting Existing Utilities

PUBLISHED BY THE AMERICAN SOCIETY OF CIVIL ENGINEERS

Standard Guideline for Investigating and Documenting Existing Utilities

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a ll ri gh ts r es er www.asce.org/bookstore http://www.ascelibrary.org https://cedb.asce.org https://ascelibrary.org https://ascelibrary.org https://dx.doi.org/10.1061/9780784415870

ASCE STANDARDS

In 2016, the Board of Direction approved revisions to the ASCE Rules for Standards Committees to govern the writing and maintenance of standards developed by ASCE. All such stan-dards are developed by a consensus standards process managed by the ASCE Codes and Standards Committee (CSC). The consensus process includes balloting by a balanced standards committee and reviewing during a public comment period. All standards are revised or reaffirmed every five years, unless approved for an extension. Requests for formal interpretations shall be processed in accordance with Section 7 of ASCE Rules for Standards Committees which is available at www.asce.org.

Errata, addenda, supplements, and interpretations, if any, for this standard can also be found at www.asce.org.

This standard has been prepared in accordance with recog-nized engineering principles and should not be used without the user’s competent knowledge for a given application. The publi-cation of this standard by ASCE is not intended to warrant that the information contained therein is suitable for any general or specific use, and ASCE takes no position respecting the validity of patent rights. The user is advised that the determination of patent rights or risk of infringement is entirely their own responsibility.

A complete list of currently available standards is available in the ASCE Library (https://ascelibrary.org/page/books/ s-standards).

Standard Guideline for Investigating and Documenting Existing Utilities iii

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www.asce.org.

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CONTENTS

PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

ACKNOWLEDGMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

1 INTRODUCTION

1.1 Scope

1.2 Definitions and Explanatory Information

1.3 Acronyms and Abbreviations

2 UTILITY QUALITY LEVEL VALUES

2.1 Introduction to Utility Quality Levels

2.1.1 Contiguous Utility Segments

2.1.2 Utility Segments Without a Utility Quality Level

2.1.3 Utility Segments and Anchor Points

2.1.4 Visible Surveyed Utility Features

2.1.5 Professional Seal Part of Utility Quality Level

2.1.6 Quality Level Depiction Unambiguous

2.2 Utility Quality Level D

2.2.1 Field Visits Optional

2.2.2 QLD Minimum Attempted Tasks

2.2.3 Existence of Service as QLD

2.2.4 Meeting the Criteria for QLD

2.3 Utility Quality Level C

2.3.1 Field Visit Required

2.3.2 QLC Minimum Attempted Tasks

2.3.3 Meeting the Criteria for QLC

2.4 Utility Quality Level B

2.4.1 QLB Minimum Attempted Tasks

2.4.2 Meeting the Criteria for QLB

2.4.3 Additional Measures for QLB Unresolved Questions

2.5 Utility Quality Level A

2.5.1 QLA Minimum Attempted Tasks

2.5.2 Meeting the Criteria for QLA

2.5.3 Additional Measures for QLA Unresolved Questions

3 UTILITY ATTRIBUTES AND METADATA DOCUMENTATION

3.1 General

3.2 Utility Attributes

3.2.1 Depth

3.2.2 Utility Owner

3.2.3 Utility Type

3.2.4 Unknown Utilities

3.2.5 Size and Shape

3.2.6 Encasement

3.2.7 Configuration

3.2.8 Operational Status

3.2.9 Date of Installation

3.2.10 Condition

3.2.11 Material Type

3.2.12 Tracer Wire

3.2.13 Pressure

3.2.14 Voltage

3.3 Metadata

3.3.1 Project Survey Datum

3.3.2 Project Task Dates

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3.3.3 Persons Performing the Utility Investigation

3.3.4 Types of Geophysics Used

3.3.5 Project Limits

3.3.6 Areas Unable to Be Investigated

3.3.7 Utilities Not in Scope

3.3.8 Professional(s) Sealing the Utility Investigation

3.3.9 Time of Day and Weather

4 ENGINEER AND OWNER TASKS

4.1 Engineer or Professional Actions

4.1.1 Project Details and Goals

4.1.2 Project Impact on Utilities

4.1.3 Explanation of Utility Quality Levels

4.1.4 Develop Scope of Work

4.1.5 Use of Historical Data

4.1.6 Quality Assurance and Third Parties

4.1.7 Formatting

4.1.8 Investigation Phases

4.1.9 Overhead Utilities Investigation

4.1.10 Subsurface Utilities Investigation

4.1.11 Judgment to Assign Utility Quality Levels

4.1.12 3D Deliverables

4.1.13 Preparing the Utility Drawing

4.1.14 Isolated Utility Features

4.1.15 Resolving Conflicting Data

4.1.16 Preparing the Utility Report

4.1.17 Iterative Impact Analysis

4.1.18 Utility Depth Data Opportunities

4.1.19 Seal of Investigation Results

4.2 Project Owner

4.2.1 Scope and Formatting Specification

4.2.2 Utility Records Assistance

4.2.3 Communication of Changed Conditions

4.2.4 Project Team Communications

4.2.5 Notification of Suspected Deficiencies

4.2.6 Utility Owner Communications

5 DELIVERABLES FORMATTING

5.1 General

5.2 Deliverable Types

5.3 Utility Attributes and Symbology

5.3.1 General

5.3.2 Line Type

5.3.3 Labeling

5.3.4 Symbol Embedding

5.3.5 Color

5.3.6 Layer or Level

5.3.7 Accompanying Text

5.3.8 Line Weight or Multiple Lines

5.3.9 Profiles and Cross Sections

5.3.10 Vaults

5.3.11 Project Limits

5.4 Utility Documentation Legend

5.4.1 Examples of Other Utility Descriptors

5.5 Examples of Utility Drawing Deliverables

APPENDIX A RELATIVE COSTS AND BENEFITS OF QUALITY LEVELS

A1 Relative Costs and Benefits of Quality Levels

A1.1 Cost Savings A1.2 Costs vi STANDARD ASCE/UESI/CI 38-22

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APPENDIX B SURFACE GEOPHYSICAL METHODS FOR UTILITY IMAGING

B1 Surface Geophysical Methods for Utility Imaging B2 Electromagnetic Methods

B2.1 Pipe and Cable Locators B2.2 Radio Frequency Identification B2.3 Terrain Conductivity B2.4 Resistivity Measurements B2.5 Metal Detectors B2.6 Ground Penetrating Radar B2.7 Optical Methods B2.8 Infrared (Thermal) Methods B2.9 X-Ray Methods (Shadows of Structures) B2.10 AM Broadcast Band Gradiometer-Antenna Receiver

B3 Magnetic Methods B3.1 General B3.2 Total Field Measurements B3.3 Gradiometric Measurements

B4 Elastic Wave Methods B4.1 General B4.2 Acoustic Emission

B5 High-Cost, Very Specialized Methods B5.1 General B5.2 Inertial Mapping B5.3 Microgravitational Techniques B5.4 Isotopic (Radiometric) Techniques B5.5 Chemical Techniques B5.6 Borehole Geophysics

APPENDIX C THREE-DIMENSIONAL UTILITY MODELS

C1 Three-Dimensional Utility Models

COMMENTARY TO STANDARD 38-22

C2 UTILITY QUALITY LEVEL VALUES

C2.1 Introduction to Utility Quality Levels

C2.1.2 Utility Segments Without a Utility Quality Level C2.1.3 Utility Segments and Anchor Points C2.1.5 Professional Seal Part of Utility Quality Level C2.1.6 Quality Level Unambiguous

C2.2 Utility Quality Level D C2.2.3 Existence of Service as QLD C2.2.4 Meeting the Criteria for QLD

C2.3 Utility Quality Level C C2.4 Utility Quality Level B C2.5 Utility Quality Level A

C3 UTILITY ATTRIBUTES AND METADATA DOCUMENTATION

C3.1 General

C3.2.1 Depth C3.2.3 Utility Type C3.2.5 Size and Shape C3.2.6 Encasement C3.2.7 Configuration C3.2.10 Condition C3.2.11 Material Type C3.2.12 Tracer Wire C3.3.3 Technicians Performing the Utility Investigation C3.3.5 Project Limits C3.3.7 Utilities Not in Scope

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C4 ENGINEER AND OWNER TASKS

C4.1.1 Project Details and Goals C4.1.3 Explanation of Utility Quality Levels C4.1.4 Development of Scope of Work C4.1.5 Use of Historical Data C4.1.6 Quality Assurance and Third Parties C4.1.7 Formatting C4.1.8 Investigation Phases C4.1.9 Overhead Utilities Investigation C4.1.11 Judgment to Assign Utility Quality Levels C4.1.12 3D Deliverables C4.1.14 Isolated Utility Features C4.1.16 Preparing the Utility Report C4.1.17 Iterative Impact Analysis C4.2.3 Communication of Changed Conditions

C5 DELIVERABLES FORMATTING

C5.3.2 Line Type C5.3.10 Vaults C5.4.1 Examples of Other Utility Descriptors

C5.5 Examples of Utility Drawing Deliverables

REFERENCES

INDEX

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PREFACE

The provisions of this document are written in permissive language and, as such, offer to the user a series of options or instructions but do not prescribe a specific course of action.

Significant judgment is left to the user of this document.

ASCE 38 is a combination of a prescriptive standard and a performance standard. As a prescriptive standard, it sets forth a series of minimum actions necessary to achieve Utility Quality Level Documentation. As a performance standard, it describes the significant professional judgment exercised by the profes-sional to determine the appropriate timing, sequencing, location, and scope of a Utility investigative effort to achieve the goal of reduced Utility issues during Project Delivery.

This engineering standard is developed to safeguard the public welfare by providing guidance on performing Utility Investigations and documenting results in a standardized fash-ion, which in turn empowers the design engineer to address two objectives: (1) Design so as to have minimal Utility related issues; and (2) protect engineers, project owners, Utility own-ers, and the public against Utility related claims that might arise during Project Delivery. ASCE 38 minimizes issues that might otherwise arise from using incorrect and incomplete Utility data. Moreover, ASCE 38 compliant data clearly conveys, through graphical and written documents, the relative, non-quantifiable uncertainty associated with the Utility’s existence and location. Throughout Project Development, understanding the uncertainty assigned to a documented Utility allows engi-neers to make better risk-based decisions regarding placement of design elements, protecting or relocating utilities, and public safety issues.

Subsurface Utility Engineering (SUE) has emerged in the last three decades as a professional effort and best practice for performing and documenting the results of Utility Investigations.

Subsurface Utility Engineers acquire, process, characterize, as-sess quality, and present Utility information for Project Devel-opment. This iterative documentation facilitates effective man-agement of the risks associated with Project Development and construction that may affect, or be affected by, existing utilities.

SUE combines traditional and emerging civil engineering prac-tices of Utility data collection and documentation with advances in geophysical investigation and data management technologies, design and construction knowledge of past and current Utility systems, and scientific concepts for assessing and defining the quality and relative uncertainty of Utility information. The practice of SUE leads to Deliverables sealed by responsible professionals who directly oversee and execute the Utility Investigation and develop the resulting Documentation of exist-ing subsurface utilities at their achieved Utility Quality Levels.

When part of the scope, SUE professionals also document certain aspects of aerial utilities that are necessary for Utility conflict analysis and relocation design. The processes leading to SUE Deliverables are executed by professional(s) proficient in engi-neering, surveying, and geological and geophysical sciences.

Moreover, these efforts are typically led by a professional engineer in responsible charge who is subject to relevant liabili-ties and statutes regulating professional engineering.

Historically, SUE was initially defined as “designating, locat-ing, and data management.” SUE developed over time to include the concept of Utility Quality Levels that defined the level of uncertainty of a utility’s location and existence. ASCE 38-02 standardized the practice of assigning a Utility Quality Level to a Utility Segment. SUE is predicated on the application of appro-priate techniques and methods to obtain important information on the existence and location of utilities even if existing records are incomplete or unavailable. The basis of this standard is predicated on the original SUE practice that most projects will benefit from the concurrent and integrated use of geophysics, records research, and a Utility Feature survey as early as possible in Project Development.

This edition of ASCE 38 adds guidance on collecting and recording Depths of Utility Features and Utility Segments. It recommends that a Utility Report that has been authored by a qualified professional incorporate any Utility Drawing Deliver-ables. The Utility Report is particularly important when notes and/or Metadata are not embedded within the Utility Drawing itself. A new section on Utility Attributes has been added. In addition, clarifications and enhancements have been added to common definitions used in this document. Commentary previ-ously embedded throughout the standard language in the previ-ous edition is now in a separate section.

The commentary and appendixes in this document provide supplemental guidance for interpretation and use. For example, the appendix on geophysical techniques provides a compilation of shallow geophysical techniques and instruments that are functional for detecting, tracing, and imaging existing underground utilities.

These tools provide evidence leading toward the judgment of the utilities’ most probable location based on measurable character-istics. This is a highly specialized discipline that is undergoing continuous technologic advancement. Users of this standard must remain current with equipment principles, capabilities, operating parameters, and limitations. This edition includes an appendix that reflects academic and organizational studies on costs and benefits of projects that have used Utility Quality Levels. An appendix provides guidance on the development of three-dimensional Utility models, a relatively new practice.

The title of this standard has changed from its previous edition to (1) more succinctly convey its purpose, and (2) better differ-entiate it from ASCE 75-22, Standard Guideline for Recording and Exchanging Utility Infrastructure Data, which focuses on documenting newly installed infrastructure. Both underground and aboveground Utility networks need to be considered during Project Delivery. Resolutions of conflicts at one part of the network often affect other parts, whether they are subsurface or aerial. Sufficient Attributes of aerial networks and structures are often missing from topographical surveys, resulting in surprises of cost and time during Project Delivery. Therefore, a section on aerial Utility documentation is included.

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ACKNOWLEDGMENTS

ASCE acknowledges the work of this standard committee of the Utility Engineering and Surveying Institute and the Construction Institute. This balanced group comprises individuals with varied backgrounds, including professionals experienced in subsurface Utility Engineering; Utility infrastructure documentation; geology; geophysics; surveying; computer-aided design and drafting; geographic information systems; highway and other infrastructure design; right-of-way; geotechnical engineering; and Utility design.

Members James H. Anspach, P.G.(r), Dist.M.ASCE, Chair Kevin S. Nichols, P.E., Vice Chair Cesar A. Quiroga, Ph.D., P.E., Secretary

John Berrettini C. C. Chang, Ph.D., P.E.

James R. Garrett, P.E.

Jeff Harrott, P.Eng.

Kenneth Kerr, P.E.

John L. Krause, P.L.S.

Kenneth Leuderalbert, P.E.

Jeffrey J. Lew, P.E., P.S.

Drew F. Markewicz, P.E., PMP M. Renee Mayer, P.E., SR/WA Philip J. Meis, P.E.

Nicole Metje, Ph.D., P.Eng.

Randall J. Murphy Kien V. Nguyen, P.E.

James F. Noone, P.E.

Carlo Pilia, P.E., CEng.

Cary A. Skahn, P.E.

Mark Warden Nicholas Zembillas Charon Williams

Associate Members Lawrence Arcand, P.E., P.Eng.

John P. Campbell, P.E., SR/WA Raymond Chandler Kristopher B. Harbin, EIT C. Paul Scott, P.E.

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5.5 Examples of Utility Drawing Deliverables