Legal Documents of Halls
Code of Halls
Title 18 Water and Sewers
Chapter 6 Sewer Use Regulations
18-610 : Conventional pollutants.
- BOD, TSS AND NH3-N. The POTW treatment plant was designed to accommodate specific waste load concentrations and mass amounts of Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), and Ammonia Nitrogen (NH3-N). If an industrial user discharges concentrations of these pollutants in excess of the criteria to protect the POTW treatment plant influent listing in § 18-609(2), added operation and maintenance costs will be incurred by the POTW. Therefore, any industrial user who discharges concentrations in excess of the criteria to protect the POTW treatment plant influent listed in § 18-609(b) for any of the conventional pollutants such as BOD, TSS, and/or NH3-N will be subject to a surcharge. The formula for this surcharge is listed in § 18-615(3). The town also reserves the right to, at any time, place specific mass or concentration limits for BOD, TSS and/or NH3-N on the industrial user if the industrial user's discharge of the excessive strength wastewater causes to the POTW treatment plant to violate its NPDES permit.
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Oil and grease. Oil and grease loadings were not taken into account in the design of the POTW treatment plant; however, oil and grease are regulated under this chapter as conventional pollutants.
"Free" and "emulsified" oil and grease shall be differentiated based on the following procedure. One aliquot of sample shall be extracted with freon using EPA Method 413.1, with the exception that the sample shall not be acidified prior to the extraction. The result of this analysis will be considered "free" oil and grease. A second aliquot of sample shall be prepared by adding sulfuric acid and heating until any emulsion breaks. The sample shall then be extracted with freon using EPA Method 413.1. The result of this analysis will be considered "total" oil and grease. "Emulsified" oil and grease will be considered the arithmetic difference between "total" and "free" oil and grease.
If an industrial user discharges concentrations of "free" oil and grease in excess of the criteria to protect the POTW treatment plant influent listed in § 18-608(2) for "free" oil and grease, added operation and maintenance costs will be incurred by the POTW. Therefore, any industrial user who discharges concentrations in excess of the criteria to protect the POTW treatment plant influent listed in § 18-608(2) for "free" oil and grease will be subject to a surcharge. The formula for this surcharge is listed in § 18-615. The town also reserves the right to, at any time, place specific mass or concentration limits for "free" oil and grease on the industrial user if the industrial user's discharge of the excessive strength wastewater causes to the POTW treatment plant to violate its NPDES permit.