30 White Noice Files with exacly the same level of decibel

Hi,

I need 30 white noise audio files created. They all have to be the same level of decibel (no one can be louder than others). 30 seconds long and the end must perfectly fit to the beginning (meaning that when the sound is on repeat, there is no saying where it begins or ends). Some could be washing machine, rain, ocean waves, water dripping, vacuum cleaner, crickets, fireplace burning wood, bees, metronome etc.

Looking forward to hear your ideas.

Still deciding on adequate file type.

Best,
Boris