Section 21-1507. WASTEWATER MONITORING

 

1507.1 WASA may require any Industrial User to construct monitoring facilities to allow inspection, sampling, and flow measurement of the discharges from the building sewer or internal drainage systems, and may also require sampling or metering equipment to be provided, installed and operated, at the expense of the Industrial Users.

 

1507.2 The monitoring facility shall be situated on the Industrial User's premises and located so that it will not be obstructed by the landscape or by parked vehicles. There shall be ample room in or near such monitoring facilities to allow accurate flow measurement, sampling and compositing of samples for analysis.

 

1507.3 The monitoring facilities, sampling, and measuring equipment shall be approved by WASA and maintained at all times in a safe and proper operating condition at the expense of the Industrial User.

 

1507.4 Sampling and analysis shall be done in accordance with the techniques prescribed in 40 C.F.R. Part 136 and amendments thereto and documented in accordance with the requirements in § 1512. 

 

1507.5 Where 40 C.F.R. Part 136 does not contain sampling or analytical techniques for the pollutant in question, or where the EPA Administrator determines that the 40 C.F.R. Part 136 sampling and analytical techniques are inappropriate for the pollutant in question, sampling and analysis shall be performed using validated analytical methods or any other applicable sampling and analytical procedures, including procedures suggested by WASA, and approved by the EPA Region III Administrator.

 

1507.6 Industrial Users shall collect and analyze all samples as follows:

 

(a) Collect grab samples for pH, cyanide, total phenols, oil and grease, sulfide, and volatile organic compounds; 

 

(b) Collect twenty-four (24) hour composite samples for all other pollutants, through flow-proportional composite sampling techniques, unless WASA authorizes time-proportional composite sampling or grab sampling;

 

(c) Where WASA authorizes time-proportional composite sampling or grab sampling, the samples shall be representative of the discharge and the decision to allow the alternative sampling shall be documented in the Industrial User file for that facility or facilities; and

 

(d) Using protocols (including appropriate preservation) specified in 40 C.F.R. Part 136 and appropriate EPA guidance, multiple grab samples collected during a twenty-four (24) hour period may be composited prior to the analysis as follows:

 

(1) For cyanide, total phenols, and sulfides the samples may be composited in the laboratory or in the field;

 

(2) For volatile organic compounds and oil and grease the samples may be composited in the laboratory; and

 

(3) Composite samples for other parameters unaffected by the compositing procedures as documented in approved EPA methodologies may be authorized by WASA, as appropriate.

 

1507.7 For sampling required in support of the Baseline Monitoring Report in § 1508.5 and ninety (90) day Compliance Report in § 1508.7, a minimum of four (4) grab samples shall be collected for pH, cyanide, total phenols, oil and grease, sulfide, and volatile organic compounds for facilities for which historical sampling data do not exist.  For facilities for which historical sampling data are available, WASA may authorize a lower number of required grab samples.

 

1507.8 For sampling required in support of the Periodic Compliance Report in § 1508.3, WASA shall specify the number of grab samples necessary to assess and ensure compliance by Industrial Users with applicable pretreatment standards and requirements.

 

1507.9 For all Categorical Industrial Users, samples shall be collected immediately downstream from pretreatment facilities or from the regulated process if no pretreatment exists.  For all Industrial Users, sampling location(s) will be specified in the permit and shall be representative of the normal discharges occurring during the reporting period.

 

1507.10 Industrial Users shall maintain records of all information resulting from any monitoring activities required by this chapter, including documentation associated with Best Management Practices. The records shall include for all samples:

 

(a) Date, time, and place of sampling, method of sampling, preservation used, and the names of the person or persons taking the samples;

 

(b) Date, time, and place where sample analyses were performed;

 

(c) Name of the person who performed the analyses;

 

(d) Analytical techniques or methods used; and

 

(e) Results of such analyses.

 

1507.11 Waivers to Sampling Requirements. WASA may authorize Industrial Users subject to Categorical Pretreatment Standards to forego sampling of a pollutant if the Industrial User has submitted a request for a waiver and has demonstrated through sampling and other technical factors that the pollutant is neither present nor expected to be present in their discharge or is present only at background levels (for example, due to the levels in their water intake) and without any increase in the pollutant due to the activities of the Industrial User.  All waiver requests are subject to the following conditions:

 

(a) A waiver may be granted if the pollutant is determined to be present solely due to sanitary wastewater discharged from the facility provided that the sanitary wastewater is not regulated by an applicable Categorical Pretreatment Standard and otherwise includes no process wastewater;

(b) The waiver shall be included in the Industrial User’s permit and is valid only during the period of the permit, which in no case shall exceed five (5) years. The Industrial User shall submit a new waiver request for each permit issued; 

(c) To justify the waiver request, the Industrial User shall sample their waste stream on at least two (2) separate occasions from a location that is representative of all wastewater from all processes prior to any treatment at the facility;

(d) All sampling shall follow the sampling and analysis requirements listed in this section;

(e) Non-detect sample results may only be used as a determination that a pollutant is not present if the EPA approved method from 40 C.F.R. Part 136 with the lowest minimum detection level for that pollutant was used for the analysis;

(f) The waiver request shall include the certification statement in § 1508.10 and shall be signed in accordance with § 1508.11;

(g) Industrial Users who are granted a waiver shall certify on each Periodic Compliance Report that there has been no increase in the pollutant in its discharge using the following language:

 

Based on my inquiry of the person or persons directly responsible for managing compliance with the Pretreatment Standard for 40 C.F.R. § __________ (specify applicable National Pretreatment Standards), I certify that, to the best of my knowledge and belief, there has been no increase in the level of _________ (list the pollutant) in the wastewater due to the activities at the facility since filing of the last periodic report as required under 21 DCMR § 1508;

(h) In the event that a waived pollutant is found to be present or is expected to be present based on changes to the Industrial User’s operations, the Industrial User shall immediately notify WASA and comply with monitoring and reporting requirements listed in § 1508.3 or other more frequent monitoring imposed by WASA; and

(i) The granting of a waiver does not supersede certification or other requirements established in Categorical Pretreatment Standards.

1507.12 WASA may conduct sampling and analysis in lieu of or in addition to Industrial User sampling.  Fees for sampling and laboratory analyses may be charged to the Industrial User.

 

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.)).

source

Final Rulemaking published at 33 DCR 6194, 6200 (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, 1049 (February 10, 2012).

EditorNote

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 1507 is formerly entitled "Pretreatment Requirements."