12.16.080 Local limits.
(1) The Public Works Superintendent may establish local limits pursuant to 40 CFR 403.5(c).
(2) The following pollutant limits are established to protect against pass through and interference and reflect the application of reasonable treatment technology. No person shall discharge wastewater in excess of the following daily maximum limits if the total mass discharged would exceed that contained in 1,000 gallons at the below limit (see column to the right of each pollutant concentration limit).
(3) The below limits 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 Public Works Superintendent may impose mass limits in addition to concentration based limits.
(4) Users discharging BOD, TSS, or ammonia in excess of the concentration limits by more than the threshold amount must apply for a permit. For example, a user discharging 2,000 gallons per day of BOD at 450 mg/l. The surchargeable concentration would be 450-250 or 200 mg/l, which when multiplied by 2,000 gpd (and 8.34 lb/g) yields 3.33 lb/d. Such users shall be subject to surcharges as established by the Public Works Superintendent under the authority of this chapter up to the “ceiling” loading limit established by permit.
(5) Users shall be subject to “instantaneous limits” (as determined by a grab sample) of equal to twice the below “daily maximum” concentrations for any pollutant for which a composite sample is required in a permit. This provision is inapplicable to users without permits, or without the permit requirement to collect a composite sample for the analyte in question.
|
Conventional Surcharge Pollutants |
||
|---|---|---|
|
250 |
mg/l BOD5 |
10 lb/d |
|
250 |
mg/l total suspended solids |
10 lb/d |
|
50 |
mg/l ammonia |
.5 lb/d |
|
Protection of Sewer Line Blockage |
||
|---|---|---|
|
100 mg/l |
Oil and grease of animal or vegetable origin |
Any amount |
|
Protection Against Corrosion, Pass Through, and Interference |
||
|---|---|---|
|
50 mg/l |
Hydrocarbon based oil/grease |
Any amount |
|
0.5 mg/l |
Sulfides (H2S vapor toxicity threshold) |
.004 lb/d |
|
50.0 mg/l |
Sulfates |
0.4 lb/d |
|
1,000 mg/l |
Total chloride |
8 lb/d |
|
5,000 mg/l |
Total dissolved solids |
40 lb/d |
|
1,000 mg/l |
Total organic solvents (incl. alcohols) |
8 lb/d |
|
5 |
Minimum pH in standard units |
|
|
11 |
Maximum pH in standard units |
|
|
10% |
Decrease in the maximum effluent concentration which has no observable detrimental effect (NOEC) in any whole effluent toxicity test. |
|
(6) The Public Works Superintendent shall use the individual permit process to establish ceiling limits for compatible pollutants and appropriate discharge limits for all other pollutants not listed under this section. This includes pollutants subject to regulation under RCRA, volatile or semivolatile organics, halogenated or brominated compounds, poly-aromatic hydrocarbons, polymers, surfactants, pesticide active ingredients, etc.
(7) The Public Works Superintendent 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 this section. 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. 445-N, §1, 2014)