def create_station_id(loc_name, vs30, z1p0=None, z2p5=None):
    """ Creates a projects station id based on if Z1.0/Z2.5 values were specified or not"""
    station_id = f"{loc_name}_{str(vs30).replace('.', 'p')}"
    if z1p0 is not None and z2p5 is not None:
        station_id += f"_{str(z1p0).replace('.', 'p')}_{str(z2p5).replace('.', 'p')}"
    return station_id