(a)Purpose of section. Sections 35.630 through 35.638 govern nonpoint source management grants to eligible Tribes and Intertribal Consortia under sections 319(h) and 518(f) of the Clean Water Act.(b)Purpose of program. Nonpoint source management grants may be awarded for the implementation of EPA-approved nonpoint source management programs, including ground-water quality protection activities that will advance the approved nonpoint source management program.