New wastewater discharges to intermittent streams are not permitted after the effective date of this regulation except to resolve existing on-site sewage disposal failures when other alternatives are not available. Effluent limitations for discharge to intermittent streams may not be less stringent than: The minimum national effluent guidelines established under the Federal Act; Those levels necessary to maintain the water quality standards of the intermittent stream and of downstream segments; Those levels necessary to protect the biological community of the intermittent stream; or Those levels necessary to protect public health.