D.C. Mun. Regs. tit. 21, r. 21-1511

Current through Register Vol. 71, No. 49, December 6, 2024

Rule 21-1511 - HIGH-STRENGTH WASTE FEE

1511.1

Permitted Significant Industrial Users discharging high strength wastewater into the District's wastewater system shall be assessed a high strength waste fee, in addition to the normal sewer charges, which are based on the volume of wastewater discharged and average daily concentration for the high strength waste constituent.

1511.2

The high strength waste fee shall be applied to those permitted discharges whose average daily concentration exceeds one (1) or more of the following domestic strength wastewater concentrations:

(a) Biochemical Oxygen Demand (BOD) of three hundred milligrams per liter (300 mg/L) or Chemical Oxygen Demand (COD) of six hundred milligrams per liter (600 mg/L);

(b) Total Suspended Solids (TSS) of three hundred milligrams per liter (300 mg/L);

(c) Total Kjeldahl Nitrogen (TKN) or Total Nitrogen (TN) of forty- five milligrams per liter (45 mg/L); and

(d) Total Phosphorus (TP) of six milligrams per liter (6 mg/L).

1511.3

High strength waste fees may be applied to additional constituents for other high strength wastewater based on criteria determined by DC Water, which shall be computed in a similar manner provided in 21 DCMR § 1511.4.

1511.4

The high strength waste fee shall be computed using the following formula for those constituents exceeding the values specified in 21 DCMR § 1511.2:

High Strength Waste Fee = V x 8.34 x [FB x (AB-300 or 1/2(AC-600)) + FS x (AS-300) + FN x (AN-45) + FP x (AP-6)]

Where:

V = volume of sewage in millions of gallons discharged by the Significant Industrial User during the billing period.

FB = the cost for treating BOD expressed in dollars/pound.

AB = the average daily concentration of BOD in the sewage discharged expressed in mg/L.

AC = the average daily concentration of COD in the sewage discharged expressed in mg/L.

Use the higher value of AB-300 or 1/2(AC-600).

FS = the cost for treating TSS expressed in dollars/pound.

AS = the average daily concentration of TSS in the sewage discharged expressed in mg/L.

FN = the cost for treating TKN or TN expressed in dollars/pound.

AN = the average daily concentration of TKN or TN in the sewage discharged expressed in mg/L.

FP = the cost for treating TP expressed in dollars/pound.

AP = the average daily concentration of TP in the sewage discharged expressed in mg/L.

1511.5

The cost for treating each high strength waste constituent shall be determined by DC Water as provided in 21 DCMR § 112.6.

1511.6

The volume of sewage from the Significant Industrial User shall be determined based upon either:

(a) Metered or estimated water consumption for the billing period; or

(b) Metered or estimated wastewater discharge entering the sewer system.

1511.7

If estimated flows are used, the procedure for determining the flows shall be submitted by the Significant Industrial User and approved by DC Water.

1511.8

If metered wastewater discharged to the sewer system is used, the Significant Industrial User shall provide and maintain at their own expense, metering facilities as required to indicate accurately, to the satisfaction of DC Water, the volume of discharge to the sewer system.

1511.9

Flow data shall be submitted to DC Water in a format and content acceptable to DC Water monthly or at a frequency specified by DC Water.

1511.10

If wastewater flow data provided by the Significant Industrial User is not submitted to DC Water by the specified date, DC Water may calculate the high strength waste fee using the metered water consumption.

1511.11

The average daily concentration of each constituent shall be in a format and content specified by DC Water and submitted monthly or at a frequency specified by DC Water.

1511.12

The average daily concentration shall be based on one or more of the following:

(a) All sampling and analysis results from sampling conducted by DC Water during the assessment period.

(b) All sampling and analysis results from sampling conducted by the Significant Industrial User during the assessment period, or as specified by DC Water, that DC Water determines is characteristic of the overall nature of such discharge.

(c) Historical records for the Significant Industrial User or other Significant Industrial Users having similar discharge characteristics.

1511.13

A Significant Industrial User may challenge the high-strength waste fee assessment or appeal the General Managers final decision in accordance with the procedures set for in Chapter 4 of this title.

D.C. Mun. Regs. tit. 21, r. 21-1511

Final Rulemaking published at 33 DCR 6194, 6202 (October 10, 1986); as amended by Final Rulemaking published at 47 DCR 2948 (April 28, 2000); as amended by Notice of Final Rulemaking published at 59 DCR 1021, 1067 (February 10, 2012); amended by Final Rulemaking published at 64 DCR 437 (1/19/2018)

The Notice of Final Rulemaking published at 59 DCR 1021 (February 10, 2012) amended chapter 15 in its entirety , including renaming many of the sections. Section 1511 is formerly entitled "Miscellaneous."

Authority: The Board of Directors (the Board) of the District of Columbia Water and Sewer Authority (DC Water or WASA) pursuant to the authority set forth in the Water and Sewer Authority Establishment and Department of Public Works Reorganization Act of 1996, effective April 18, 1996 (D.C. Law 11-111; D.C. Official Code §§ 34-2201.01, et seq.(2010Repl.)) and the Wastewater System Regulation Amendment Act of 1985, effective March 12, 1986 (D.C. Law 6-95; D.C. Official Code §§ 8-105, et seq. (2008 Repl. & 2011 Supp.)).