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i Material and substantial alterations or additions to the permitted facility occurred after permit issuance which jc;_ application of less stringent effluent limitations; or ii. Information is available which was not available at the time of permit issuance (other than revised regulations, es or test methods) and which would have justified the application of a less stringent effluent limitation or standard time of permit issuance; or iii. The Division determines that technical mistakes or mistaken interpretations of law were made in issuing the permit; justified relaxation of the effluent limitations or standards; or iv. A less shingent effluent limitation or standard is necessary because of events over which the permittee has no coax for which there is not reasonable available remedy; or v. The pemtittee has received a permit variance; or vi. The permittee has installed the treatment facilities required to meet the effluent limitations in the previous pert has properly operated and maintained the facilities but has nevertheless been unable to achieve the previous e limitations, m which case, the limitations m the renewed, reissued, or modified ppermit may reflect the !a pollutant control actually achieved (but shall no[ be less stringent than required by effluent guidelines in effea hme of permit renewal, reissuance, or modification). b. A permit may not be renewed, reissued, or modified to contain effluent limitations adopted pursuant to 61.8(2)(b) or (c; Colorado Discharge Permit System Regulations that are less stringent than the comparable effluent limitarions in the pt permit, unless any of the exceprions provided herein is met and the conditions of paragraph c. of this section aze met. i. in waters where the applicable water quality standard has not yet been attained, effluent limitations based ca maximum daily load or other waste load allocation maybe revised to be less stringent if the cumulative effect c: z revisions assures attainment of such water quality standard, or the designated use which is not being attained is re~,i accordance with Section 31.6 of [he Basic Standards. ii. In waters where the applicable water quality standard has been attained, effluent lin-,itations based on a total ma daily load, other waste load allocation, or any other permitting standard (iacluding`any water quality standard) t revised to be less stringent if such revision is subject to and consistent with the antidd gradation provisions of Se: [; of the Basic Standards. Consistency with Section 3I.8 shall be presumed if the waters in question have been des by the Commission as "use protected"; or iii. Whether or not the applicable water quality standad has been attained: • (A) Material and substantial alterations or additions Co dre permitted facility occurred after permit issuance whiccj the application of less stringent effluent limitations; or (B) A less stringent effluent limitation is necessary because of events over which the permittee has no connol which there is not reasonable available remedy; or (C) The pertnittee has received a pemut variance; or D) The permittee has installed the treatment facilities required to meet the effluent limitations in the previous per has property operated and maintained the facilities but has nevertheless been tenable to achieve the previotu limitations, m which case, the limitations in the reviewed, reissued, or modified permit may reflect the I pollutant control actually achieved (but shall not be less stringent than required by effluent guidelines in el:et time of permit renewal, reissuance, or modification). c. In no event may a permit with respect to which paragraphs a. and b. of this section apply be renewed, reissued, or race contain an effluent limitation or standard which is less stringent than required by federal effluent guidelines in effect a; the permit is renewed, reissued, or modified. In no event may such a permit to discharge into state waters be r; reissued, or modified to contain a iess stringent effluent limitation if [he implementation of such limitation would ::_ violation of an applicable water quality standard. 17. Effect of Permit Issuance a. The issuance of a permit does not convey any property rights or any exclusive privilege. b. The issuance of a permit does no[ authorize any m)ury to person or property or any invasion of personal rights, cot authorize the infringement of federal, state, or local Taws or regulations. c. Except for any toxic effluent standard or prohibition imposed under Section 307 of the Federal act or any standard for sludge use or disposal under Section 405(d) of the Federal act, compliance with a permit during its term co compliance, for purposes of enforcement, vnth Sections 301, 302, 306, 318, 403, and 405(a) and (b) of the Fed: However, a perrrut may be modified, revoked zad reissued, or terminated during its teen for cause as set forth 61.8(8) of the Colorado Discharge Permit System Regulations. d. Compliance with a permit condition which implements a particular standard for sewzge sludge use or disposal sea affirmative defense in any enforcement action brought for a violation of that standard for sewage sludge use or disposai •