(a) Except as provided in paragraph (b) of this section, the Federal contribution toward the implementation of emergency measures may not exceed 75 percent of the construction cost of such emergency measures, including work done to offset or mitigate adverse impacts as a result of the emergency measures.

(b) If NRCS determines that an area qualifies as a limited resource area, the Federal contribution toward the implementation of emergency measures may not exceed 90 percent of the construction cost of such emergency measures.