§ 13.08.055. Additional commercial/industrial fees for high loading and high flow.

Although, the BSB WWTP is capable of treating certain industrial wastes, the actual treatment may increase the cost of operating and maintaining the treatment system. Therefore, there will be imposed upon each commercial and industrial user additional user fees where excessively high loading and/or high flows are present. These fees are developed around two thresholds; the first is a "surcharge level" and the second level is an "enforcement level." These concentration levels are one hundred twenty-five percent and one hundred fifty percent of typical BSB averages. The flow surcharge level is based on the flow rate used to determine significant industrial users.

A.

The surcharge level is in effect for the following parameters at the levels indicated:

Parameter	Surcharge Level
BOD (mg/l)	300
TSS (mg/l)	250
Total P (mg/l)	5.4
Total N (mg/l)	41
Flow (mgd)	0.025
COD (mg/l)	330

 

B.

The enforcement level is in effect for the following parameters at the levels indicated:

Parameter	Enforcement Level
BOD (mg/l)	400
TSS (mg/l)	400
Total P (mg/l)	6.5
Total N (mg/l)	49.5
Flow (mgd)	0.05
COD (mg/l)	440

 

C.

Both surcharge and enforcement level fees are adopted with the annual metro sewer resolution.

D.

Where commercial users have a flow meter measuring effluent flow, the effluent flow meter shall be used as the basis rather than a water supply meter.

E.

Fee Calculations.

1.

Surcharge Level for Concentrations. the surcharge level fees for concentration are based on the following equation:

(Ca - Sc)*8.34*Flow*Days*Surcharge
with the following definitions:

Ca =  actual user discharge concentration in mg/l.

Sc =  the surcharge level concentration for each in mg/l.

8.34 =  conversion factor.

Flow =  average discharge flow in mgd for billing period.

Days =  number of days in billing period.

Surcharge =  $/lb from sewer rate resolution for each.

2.

Surcharge Level for High Flow. The surcharge level fees for flow are based on the following equation:

(Flow-0.025)*1000*Days*Surcharge
with the following definitions.

Flow =  average discharge flow in mgd for billing period.

0.025 is  surcharge threshold for flow in mgd.

Days =  number of days in billing period.

1000 =  conversion factor.

Surcharge =  $/1000 gallons from sewer rate resolution.

3.

Enforcement Level for Concentrations. The enforcement level fees for concentration are based on the following equation:

(Ca-Sc)*8.34*Flow*Days*Enforcement
with the following definitions:

Ca =  actual user discharge concentration in mg/l.

Sc =  the surcharge level concentration for each in mg/l.

8.34 =  conversion factor.

Flow =  average discharge flow in mgd for billing period.

Days =  number of days in billing period.

Enforcement =  $/lb from sewer rate resolution for each.

4.

Enforcement Level for High Flow. The enforcement level fees for flow are based on the following equation:

(Flow-0.025)*1000*Days*Enforcement
with the following definitions.

Flow =  average discharge flow in mgd for billing period.

0.025 is  surcharge threshold for flow in mgd.

Days =  number of days in billing period.

1000 =  conversion factor.

Enforcement =  $/1000 gallons from sewer rate resolution.

5.

Both Surcharge and Enforcement Level Fees shall be charged based on the following units:

BOD	$/lb
TSS	$/lb
Total P	$/lb
Total N	$/lb
Flow	$/1000 gallons
COD	$/lb

 

( Ord. No. 15-16, § 8, 12-18-2015 )