A. The director may establish and periodically modify local limits pursuant to 40 CFR Part 403.5(c) based upon the POTW’s site-specific flow and loading capacities, receiving water considerations, and reasonable treatment expectations for nondomestic wastewater using a method approved by the approval authority.

B. Unless the director determines that the public health or safety require an earlier implementation, any modification the director establishes to the local limits in Table 14.10.080-1 shall not go into effect until 30 days after reasonable notice of the changes is provided to the public and persons known to the city who may discharge wastewater containing analytes subject to such local limits.

C. The pollutant limits in Table 14.10.080-1 are established to protect against pass through and interference and reflect the application of reasonable treatment technology. No significant industrial user or categorical industrial user shall discharge wastewater in excess of the daily maximum limits shown in Table 14.10.080-1 unless authorized in writing by the director. The director may also apply the pollutant limits in Table 14.10.080-1 to other users through the issuance of a control document.

D. The local limits shown in Table 14.10.080-1 apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for total metal unless indicated otherwise. The director may impose mass limits in addition to, or in place of, concentration based limits.

E. Significant industrial users and categorical industrial users shall also be subject to “instantaneous limits” (as determined by a grab sample) of equal to twice the “daily maximum” concentration limit identified in Table 14.10.080-1 for any pollutant for which a composite sample is required in a permit. This provision is not applicable to SIUs and CIUs without the permit requirement to collect a composite sample for the analyte in question.

F. No user shall discharge wastewater in excess of the daily maximum limits shown in Table 14.10.080-2 unless authorized in writing by the director. The standard limits in Table 14.10.080-2 apply at the point where the wastewater is discharged to the POTW.

G. A high strength user is defined in VMC 14.10.040. It shall be the responsibility of each user with the potential to meet the definition of a high strength user to notify the control authority and apply for a permit. High strength users shall be subject to charges as determined by the director under the authority of this chapter.

H. The director shall use the individual permit process to establish ceiling limits for compatible pollutants and appropriate discharge limits for all other pollutants not listed in VMC 14.10.080. This includes pollutants subject to regulation under RCRA, volatile or semi-volatile organic compounds, halogenated or brominated compounds, poly-aromatic hydrocarbons, polymers, surfactants, pesticide active ingredients, and any other pollutant identified by the director.

I. The director may establish and require best management practices for any category of user or type of industrial process which creates a nondomestic waste stream. Such requirements may be applied either in lieu of or in addition to the local limits of VMC 14.10.080. BMPs may also include alternative limits which may be applied at the end of a specific process or treatment step instead of at the combined effluent. (Ord. M-4431 § 3, 2023; Ord. M-3970 § 2, 2010)