Thirty days’ notice is not required before a license or permit may be suspended or revoked by the director where the premises or appurtenances of the licensee or permittee are in a manifestly insanitary condition nor in cases of manipulation by the licensee or permittee of pasteurization equipment, pasteurizer, recording and indicating thermometer charts or pasteurization temperature control devices, measures, weights, samples, or tests for milk constituents or bacterial, or somatic cell counts of milk or cream upon which payment is based, or the record of such tests or in any instance where the director determines there is an imminent or substantial danger to public health.