March 24, 2017
Pursuant to direction given in D17-01-009, instructing the Peer Development Panel (PDP) and the Independent Review Team (IRT) to reach agreement on an initial Shape B product and Tier Definitions associated with map zones, that then allows subsequent regionalized map review for the ultimate creation of PUC Fire Map 2, the IRT reports as follows:
Shape B has been agreed upon, and has been posted to the website being used for map review: http://cpuc_firemap2.sig-gis.com/
These data represent collaborative work between the IRT and the PDP to systematically exclude non-burnable areas from Shape A, relying on GIS rule systems utilizing vegetation and land cover provided by Cal Fire (fveg16_2). All data inputs and processing have been documented and will be provided upon final delivery and report of Map2.
The IRT and PDP have also agreed to and approved finalized tier definitions as of March 24, 2017. While an agreement was close earlier in the week, some parties objected to some residual language that was ultimately excluded from the definitions based on IRT discussion. Instead of moving forward with submission of definitions that carried objections and rebuttal, the two groups continued to work on an agreeable consensus. The approved definitions are as follows: ultimately some unresolved objections from members of the PDP:
Tier 1 is [all] area in the state of California that is not in Tier 2 or Tier 3.
Tier 2 is elevated risk (including likelihood and potential impacts of occurrence) from wildfires associated with overhead utility powerlines or overhead utility powerlines also supporting communication facilities, including impacts to people or improved property.
Tier 3 is extreme risk (including likelihood and potential impacts of occurrence) from wildfires associated with overhead utility powerlines or overhead utility powerlines also supporting communication facilities, including impacts to people or improved property.
Guidance for identifying boundaries between Tiers
Tier 2 is distinguished from Tier 1 by having greater likelihood of fire initiation and growth that would impact people or property, from utility-associated wildfires, and where enhanced utility regulation could be expected to reduce utility-fire risk.
Tier 3 is distinguished from Tier 2 by having highest likelihood of fire initiation and growth that would impact people or property from utility-associated fires, and where the most restrictive utility regulations are necessary to reduce utility-fire risk.
On behalf of the PUC Map 2 Independent Review Team