Pollutant discharge concentration or mass limits shall be established where deemed appropriate by the Director for inclusion in the Wastewater Discharge Permit. The limits shall normally apply to the combined total discharge of polluted wastewater from the facility.
(a) Combined Wastestream Formula. Non-contact cooling water, roof drains or other polluted wastewaters prohibited elsewhere by this sewer use chapter may not be included in wastewater pollutant concentration determination. In the presence of such flows the City may employ the use of combined wastestream formulas to determine actual pollutant strengths or alternate limits.
Calculation methods which result in limits below analytical detection limits of the pollutant parameters shall dictate that such unpolluted flows must be eliminated or otherwise separated from wastestreams containing regulated pollutants.
(b) Water Use Discharge Limitation. Water use discharge limits may be included in the Wastewater Discharge Permit for the purpose of establishing maximum pollutant loadings discharged by an Industrial User.
(1) The water use for an Industrial User as it applies to permitted discharge shall be equal to the water consumption as recorded on the Industrial User's water and sewer use billing plus water from any other source such as private wells which is discharged to the Public Sewer except as herein provided. The Industrial User shall be responsible for metering private supplies.
(2) The permitted wastewater discharge may be established by the City based on the elimination of non-polluted or non-discharged waters from the calculations.
(3) Where the permitted discharge is less than that in Section 921.38
(b), (1) above, the Industrial User shall be required to provide satisfactory information to the City that the actual discharge is less than water consumption by one of the following methods:
A. Provide flow metering devices approvable by the Chief, IPP on all discharge points under permit;
B. Provide separate metering for any discharges which are not included in the permitted wastestream; or,
C. Provide other proof satisfactory to the Chief, IPP of the quantity of non-discharged water to be subtracted from the metered water supplied by the City, in calculating the permitted discharge flow.
(4) Other verifiable and reliable method agreed upon by the City.
(5) Since the wastewater discharge limit in the permit is established to control maximum pollutant discharge loading and is not meant to control or discourage the use of water, the City shall have the authority to waive violations of water use discharge limits provided that actual pollutant loading as determined by the permitted concentration and permitted wastewater discharge is not exceeded and that the excess flow is not otherwise prohibited or objectionable.
(c) Self Monitoring. The Industrial User shall perform routine sampling and analysis of the discharge covered by the Wastewater Discharge Permit whenever such activities are required in the provisions of the Permit ordered by the Director. The sampling and analysis shall be performed in compliance with the methods approved in 40 CFR, Part 136, Sampling and Laboratory Analysis.
Where self-monitoring requirements have been imposed on an industrial user, a Special Monitoring Agreement may be offered to that industry where the City assumes the responsibility for collection, preparation/preservation and transportation of samples to a contract lab (where applicable). Results of these analyses will be reported from the lab to both the industrial user and the City. Specific conditions of such an Agreement will be determined by the Chief, I.P.P. The City reserves the right to deny such an Agreement where it determines such an agreement would not be in its best interest.
Where sampling performed by an Industrial User indicates a violation, the user shall notify the City of Ashland's Chief; Industrial Pretreatment within 24 hours of becoming aware of the violation. The User shall also repeat the sampling and analysis and submit the results of the repeat analysis to the City of Ashland's Chief, I.P.P., within 30 days after becoming aware of the violation. Additional monitoring above and beyond that required in an IU's permit is acceptable; however, compliance reports must include the results of all analyses performed as specified in 40 CFR 403.12(e).