Ala. Admin. Code r. 335-6-5-.17 Calculating Sid Permit Limitations

• Library: Alabama Administrative Code
• Edition: 2023
• Currency: Current through Register Vol. 42, No. 3, December 29, 2023
• Year: 2023
• Citation: Ala. Admin. Code r. 335-6-5-.17

(1) SID Permit discharge limitations, standards and prohibitions shall be established for each discharge point from the facility, except where limitations on internal waste streams are more appropriately used.

(2) General pretreatment standards shall be included in all SID Permits.

(3) Where applicable, SID Permit limits shall be calculated using categorical pretreatment standards. Such limits shall be calculated using the following methods:

(a) When the limit is production based, a reasonable measure of the applicant's long term daily production, such as the average daily production during a representative year, shall be used to calculate the permit limits. Where daily and average maximum permit limits are calculated, averages from the same production period will be used to calculate both limits.

(b) When calculating equivalent concentration or mass limits, an average daily flow based upon a reasonable measure of the applicant's actual long-term flow rate, such as the average daily flow rate during a representative year, shall be used to calculate limits.

(c) When wastewater regulated under a categorical pretreatment standard is mixed with another wastewater prior to treatment an alternative limit shall be calculated in accordance with the method provided under 40 CFR Section 40National pretreatment standards: Categorical standards403.6(e) (1994).

(d) When requested by the applicant, the categorical pretreatment standard limit may be adjusted to reflect the presence of pollutants in the applicant's intake water. Adjustments shall be calculated and applied in accordance with the method provided under 40 CFR Section 40Net/Gross calculation403.15(1994). The applicant shall submit proof that the background is not metals leaching from the applicants plumbing and such proof shall consist of sampling results of water taken from as near the water meter as possible and not after contact with the applicant's plumbing.

(e) When an industrial user, to which a categorical pretreatment standard applies, uses a combination of disposal methods including discharge to a publicly owned treatment works, production based limits calculated from the standard shall be adjusted by multiplying the limit by the ratio of the quantity of wastewater discharged to the publicly owned treatment works to the quantity of...