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t) .. ... J00207 6-7 Rnre throughout the Nation but several examples occur within the re!!ion. ",-) 8-9 Very rare throur,hout the Nation nnd rer-ion with one of few examples occurrir'f( in the planninr, setting. 10 The only one of its kind or only population of a species occurrinf( in the Nation. The effect of the oroject on the environmental resource considered in the uniquenen", category is to be measured in relation to the degree of degradation or destruction of the resource. The scale of measurement is as follows: o Resource totally destroyed 1-4 Severely affected - a major portion of the resource degraded or destroyed 5 ~bderately affected - a portion of the resource degraded or destroyed but an adequate portion remaining to preserve the resource on a reduced scale (rf"~.;'1 i,"/,:. j ':,:!~..! 6-9 Ninor affect - a minor portion of the resource degraded or destroyed but not significantly affecting the resource within the planning set tin!!. 10 No Measureable effect on the resource. 4.4.20 Irreversibil~ Considerations The irreversibility eater,ory is evaluated by identifying each natural, physical and cultural resource affected by the proposed project or prOf(ram; comparing the occurrence, of the resource with occurrences of similar resources on and off the site; and determining the sif(nificance of the effec't by the degree to which the effects are reversible. Resources are identified as those described under quantity factors for each major resource category. All of the specific resources occurrinp, within the proposed project area (Le., within the reservoir lake line, and in the case of irrigation, the service area of the project; or within conduit ,or " trannmission line right-of-way) that are affected should,be listed and quantified. Those resources occurrinp. outside of the nro.ject and service 1'-38