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Federal Register / Vol. 86, No. 157 / Wednesday, August 18, 2021 / Rules and Regulations
Georgetown Salamander Critical Habitat Unit 9

Surface Critical --- Rivers Habitat Unit Boundary =streets 2z.i Subsurface Critical Habitat Unit Boundary 0

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Salado Salamander Eurycea chisholmensis 1 Critical habitat units are depicted for Bell and Williamson Counties, Texas, on the maps in this entry.
2 Within these areas, the physical or biological features essential to the conservation of Salado salamander consist of the following components:
i For surface habitat:
A Water from the Northern Segment of the Edwards Aquifer. Groundwater quality issuing to the surface from the
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underlying aquifer is similar to natural aquifer conditions as it discharges from natural spring outlets. Concentrations of water quality constituents and contaminants are below levels that could exert direct lethal or sublethal effects such as effects to reproduction, growth, development, or metabolic processes, or indirect effects such as effects to the Salado salamanders prey base. Hydrologic regimes similar to the historical pattern of the specific sites are present, with at least some surface flow during the year. The water chemistry of aquatic surface habitats is similar to
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natural aquifer conditions, with temperatures from 61 to 84 F 16 to 29
C, dissolved oxygen concentrations from 5 to 13 milligrams per liter mg/L, and specific water conductance from 317 to 814 micro-Siemens per centimeter mS/cm.
B Rocky substrate with interstitial spaces. Rocks in the substrate of the salamanders surface aquatic habitat are large enough to provide salamanders with cover, shelter, and foraging habitat.
The substrate and interstitial spaces have minimal sedimentation.

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