Keeping Mapping Data Current on Long Duration Projects James H. Anspach, P.G. Project Manager ( ) Utility Mapping Alaska Way Viaduct Project, Seattle, WA

Project Details About 110,000 vehicles use the viaduct each day. The viaduct is 2.1 miles long. The existing structure has an overall width of 51 feet (near Madison Street).

Original Mapping Scope of Work  All utilities at QL B when possible  Access every structure  Direct Connections  Depths of all pipes, cables, conduits  Sizes of all pipes, cables, conduits  Description of utility endpoints  Entered every basement  Conductor inserted into every empty conduit  Pipe & Cable Locators, GPR, Elastic Wave, Magnetic, Terrain Conductivity all used  Every cable/conduit tracked down, accounted for, and marked

Results 8+ miles of city streets averaging 20+ conductors = 1,000,000 feet of utilities +/- 7 year effort as areas of interest expanded due to geotechnical and utility issues Entered over 1000 communication and electric vaults and documented contents

Problem: How to keep utility data current  Extensive construction by City for IT conduits, security cameras.  Numerous building projects changing/adding service connections  Normal improvements with 8+ miles of City streets  Extensive communication work near stadiums  Advance utility relocation work taking place

Procedures on a yearly basis Walk entire project limits with existing utility mapping in hand –Check every utility pole for new risers and/or new appurtenances/attachments –Look for “new” street patches (on first update, sketched all patches on plans for future comparison) –Look for ongoing long-duration construction projects Aquarium, Art Museum, Stadium district, new roads

Procedures on a yearly basis  Research Permits issued by the City within previous year  If it appeared as if work could involve any utility work (new, abandoned, removed, replaced), re-designate area.  Ask all utility owners (including different City Departments) for any new records within the past year  Re-designate areas where utility changes from records  Research all one-call tickets within project limits for previous year  If appeared to be utility related, re-designate area

ISSUE: How do you communicate any changes to the mapping to the 200+ persons using that data? AutoCADD file with area of any changes “clouded” (outline and translucent mask) New utilities in bold thick line style Note (text box) with call-out arrow Accompanying WORD text document Second AutoCADD file with all changes “accepted” in normal line codes, colors, and with call-outs and clouds removed.

Level of effort  Depended upon amount of changes, but on average:  40 hours for reviewing One-Call tickets for applicability in the office  40 hours for walking project with plans in hand  40 hours for researching new permits  crew hours for designating, surveying any changes  60 hours CADD and professional review and engineer’s “seal” of final results  About 5% of initial effort  If not done annually, quality suffers and percentage of time increases.