The American Society of Civil Engineers (ASCE) has developed a National Consensus Standard titled ASCE C-I , Standard Guidelines for the Collection. ASCE Standard Guideline for the. Collection and Depiction of Existing Subsurface Utility Data. Statement of Purpose. The American Public Works. of utility data to concerned parties, utility relocation cost estimates, implementation of utility accommodation policies, and utility design. (CI/ASCE 02).
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The services that can be provided through either of these contracts include:. Each Quality Level represents an improvement over the previous level D the lowest, A the highest. Click on the Quality Levels tab above for definitions. It may provide an overall “feel” for the congestion of utilities, but it is often highly limited in terms ascs comprehensiveness and accuracy.
Its usefulness ascf be limited to early design stage project planning and route selection activities or to projects with minimal planned excavations.
Quality Level C “QL C” involves surveying visible above-ground utility facilities, such as manholes, valve boxes, posts, etc. When using this information, it is not unusual to find underground utilities that have been either omitted or erroneously plotted.
The Standard ASCE
QL C information may not, however, eliminate all inaccuracies; nor will it reveal an unrecorded line that has no surface features. Therefore, its usefulness may 3802 limited to preliminary design reviews or to projects with minimal anticipated conflicts.
Quality Level B “QL B” involves the use of surface geophysical techniques to determine the existence and horizontal position of underground utilities. This activity is called “designating”.
The Standard ASCE 38-02
It further ascee utility records asec surface topographical information, and may also help reveal unrecorded lines. Two-dimensional mapping information is obtained. This information may be sufficient to accomplish preliminary engineering goals, by helping the designer to determine where to place storm drainage systems, footers, foundations, and other design features in order to avoid conflicts with existing utilities.
Slight adjustments in the design may produce substantial cost savings by eliminating utility relocations. Quality Level A “QL A ” involves the use of nondestructive digging equipment at discrete, critical points to determine the precise horizontal and vertical position of underground utilities, as well as the type, size, condition, material, and other characteristics.
This activity is called “locating.
Subsurface Utility Engineering – Part 2: Understanding CI/ASCE 38-02
This information, when combined with other surveyed and mapped information, allows the designer to infer plan and profile information, for use in ascf final design decisions. By knowing exactly where a utility is positioned in three dimensions, the designer can accurately determine the extent of a utility conflict, or can often make small adjustments in elevations or horizontal locations and avoid the need to relocate utilities.
Additional information such as utility material, condition, size, soil contamination, and paving thickness also assists the designer and utility owner in their decisions.
QL A information in the form of test hole logswhen included in the project bid documents, may yield more favorable bids due to reduced 380-2 uncertainty about subsurface conditions.
No formal procedure has been established for CDOT personnel to follow in selecting one consultant versus the other for a particular project, but over the term of the two NPS contracts 2 yearsapproximately equal utilization of each firm is desirable. In choosing which consultant to use, factors 380-2 as specific consultant capabilities, and the ability of the consultant to meet desired timeframes for commencing and completing the SUE work may be considered.
It is not appropriate to contact both consultants with the intention of soliciting competing cost estimates.
Rich Horstmann may be contacted for information regarding the level of utilization of each consultant contract. Once 3802 on the work and costs is reached, the consultant must submit 3 original signed copies of the Task Proposal. Once such approval is obtained, the Agreements Office will coordinate issuance of the Notice to Proceed letter with the Region. The consultant may not proceed with any work until the NTP letter has been sent out.
The services that can be provided through either of these contracts include: Preliminary utility information gathering; Visual observation and surveying of above-ground utility facilities; Surface marking of buried utilities; Exposing and surveying the location of buried utility facilities; Utility facility mapping and CADD drawings; Utility relocation planning and design.
Three copies of each of the following: Contact Us Scott Hoftiezer.