Program Program Description Recommended Cycle % of Total Rejects Located Pole Life Extended Advantages Disadvantages
Sound & Selective Bore Poles are "sounded" with a hammer to detect internal decay. Poles that show signs of internal decay (based on the sound test) are bored to determine the location and extent of the decay. Every 2 years < 40% No
  • Locates obvious rejects quickly with a minimal investment.
  • Leaves a considerable number of undetected rejects (along with liability and risk)
  • 2-year inspection cycles are recommended
  • Reject rates remain high in future cycles
  • 100% O&M (no life-extension means no opportunity to capitalize a portion of the expense)
Sound & Bore Poles are "sounded" with a hammer to detect internal decay, and poles are bored to determine the location and extent of the decay. Every 2-4 years 50%-60% No
  • Locates obvious rejects quickly with a minimal investment.
  • Leaves a considerable number of undetected rejects (along with liability and risk)
  • 2 to 4-year inspection cycles are recommended
  • Reject rates remain high in future cycles
  • 100% O&M (no life-extension means no opportunity to capitalize a portion of the expense)
Sound & Bore with Partial Excavation & Selective Treatment Poles are "sounded" with a hammer to detect internal decay and bored to determine the location and extent of decay. Poles that show signs of internal or external decay are fully excavated to a depth of 18" to determine the extent of decay at the groundline. Decayed wood is removed and a preservative paste is applied to protect the remaining sound wood. Every 4-6 years 70%-90% Only for those "select" poles that receive treatment
  • Improved inspection accuracy (because a below grade portion of pole is inspected)
  • Investment will earn dividends via extended service of life of treated poles
  • Inspection cycle can be extended to 4-6 years
  • Though inspection accuracy is improved, it is not "best practive" and leaves 10%-30% of rejects unidentified.
  • Reject rates will be higher on future cycles than those obtainable with a full excavate program
Comprehensive Inspection (Sound, Bore, 18" Excavation, Remedial Treatment) Poles are "sounded" with a hammer to detect internal decay and bored to determine the location and extent of decay. Each pole is fully excavated to a depth f 18" to determine the extent of decay at the groundline. Decayed wood is removed and a preservative paste is applied to protect the remaining sound wood. Every 8-12 years 98% Yes
  • Most accurate inspection - locates 99% of rejects
  • Investment will earn dividends via extended pole life and improved plant resiliency
  • Because asset life is extended, owners may choose to capitalize all or a portion of the expense
  • Inspection cycle can be extended to 8-12 years
  • Increased initial investment
  • May take longer to inspect entire system