Table 2 Tephra clean-up thresholds used to assess tephra removal volumes for case study communities (adapted from Hayes et al. 2017)
Hayes et al. (2017) thresholds | Ensenada thresholds, refined for this study | ||
|---|---|---|---|
Thickness (mm) | Surfaces for tephra removal | Thickness (mm) | Surfaces for tephra removal |
1–10 | Roads and airports | 1–10 | Roads |
10–200 | As above, with impervious surfaces from private properties included | 10–100 | As above, with impervious surfaces from private properties included |
>  200 | Tephra removed from all surfaces | ≥100 | All impervious surfaces and 30% of tephra from all other surfaces removed |