D.C. Mun. Regs. r. 21-519
Current through Register Vol. 71, No. 23, June 7, 2024
Rule 21-519 - STORMWATER MANAGEMENT: PLAN519.1A Department-approved stormwater management plan (SWMP) shall:
(a) Govern all construction for which stormwater management is required;(b) Govern all applicable maintenance activities; and(c) Demonstrate compliance with this chapter.519.2A submitted SWMP and supporting documentation shall contain information sufficient for the Department to determine whether the SWMP complies with this chapter including:
(a) Existing site conditions, including the identification and location of each existing Best Management Practice (BMP) and whether it will remain on the site and in use or will be removed;(b) Proposed site design;(c) Each land use proposed for the site;(d) Identification and location of each proposed BMP, including geographic coordinates;(e) Design and performance of each BMP for stormwater retention, detention, and treatment;(f) Conveyance capacity of stormwater infrastructure;(g) Environmental characteristics of the site;(h) Pre- and post-development hydrologic computations, including: (1) Calculation of required stormwater management volume for:(B) Each individual drainage area; and(2) On-site and off-site retention volumes;(i) Maintenance plan and schedule for each proposed BMP;(j) Monitoring plan for each BMP that captures stormwater for use;(k) For each proposed BMP not included in the Department's Stormwater Management Guidebook (SWMG): (1) Separate identification and description; and(2) Documentation of performance and effectiveness;(l) Construction sequence for: (2) The related development or improvement project, if any.(m) A list of the construction and waste material to be stored on site and a description of the material and each pollution control measure that will be implemented to minimize exposure to stormwater discharge, including: (1) Each storage practice;(2) A spill prevention response;(3) The United States Environmental Protection Agency (EPA) identification number, or copy of application to EPA for identification number, for each hazardous waste that will be stored on site; and(4) Proof of payment of each applicable fee.519.3The retention capacity of each BMP in a SWMP shall be calculated using the applicable equations for calculating retention value in Chapter three (3) of the Department's Stormwater Management Guidebook.
519.4The pollutant removal efficiency of each BMP in a SWMP shall be calculated using the applicable equation in Chapter three (3) of the Department's SWMG.
519.5The Department may require for each area that a project proposes for use to meet the requirements of this chapter, including a contiguous area or an area with a shared BMP:
(a) Information listed in this section; or519.6A submitted SWMP shall use:
(a) A standard drawing size of twenty-four inches by thirty-six inches (24 in. x 36 in);(b) One (1) of the following horizontal scales of profile, unless otherwise approved: (1) One inch equals ten feet (1 in. = 10 ft.);(2) One inch equals twenty feet (1 in. = 20 ft.);(3) One inch equals thirty feet (1 in. = 30 ft.);(4) One inch equals forty feet (1 in. = 40 ft.);(5) One inch equals fifty feet (1 in. = 50 ft.); or(6) One inch equals eighty feet (1 in. = 80 ft.);(c) One (1) of the following vertical scales of profile, unless otherwise approved:(1) One inch equals two feet (1 in. = 2 ft.);(2) One inch equals four feet (1 in. = 4 ft.);(3) One inch equals five feet (1 in. = 5 ft.); or(4) One inch equals ten feet (1 in = 10 ft.); and(d) Drafting media that yield first or second generation reproducible drawings with a minimum letter size of No. 4 (1/8 inch).519.7A SWMP shall not be approved without the signature and seal of the Director or the Director's designee on the plan.
519.8For each as-built SWMP that an applicant submits to the Department, an applicant shall provide that a professional engineer licensed in the District of Columbia, certifies with seal and signature that:
(a) The design, and installation for an as-built plan:(1) Conforms to engineering principles applicable to stormwater management; and(2) Complies with the requirements of this chapter; and(b) A set of instructions for operation and maintenance of each BMP has been provided to the applicant.519.9 AS WMP for a project shall be consistent with all other permitting submittals to the District.
519.10The approved SWMP for a major regulated project shall be available on site for Department review for the entire period of construction during ordinary business hours.
D.C. Mun. Regs. r. 21-519
Final Rulemaking published at 60 DCR 10640 (July 19, 2013); amended by Final Rulemaking published at 67 DCR 844 (1/31/2020)Authority: Department of Consumer and Regulatory Affairs Civil Infractions Act of 1985, effective October 5, 1985, as amended (D.C. Law 6-42; D.C. Official Code §§ 2-1801.01 et seq. (2007 Repl. & 2012 Supp.)); District Department of the Environment Establishment Act of 2005, §§ 101 et seq., effective February 15, 2006, as amended (D.C. Law 16-51; D.C. Official Code §§ 8-151.01 et seq. (2008 Repl. & 2012 Supp.)); National Capital Revitalization Corporation and Anacostia Waterfront Corporation Reorganization Act of 2008, effective March 26, 2008 (D.C. Law 17-138; 55 DCR 1689), as amended by the Anacostia Waterfront Environmental Standards Amendment Act of 2012, effective October 23, 2012 (D.C. Law 19-192; D.C. Official Code §§ 2-1226.31 et seq.) (2012 Supp.)); The Soil Erosion and Sedimentation Control Act of 1977, effective September 28, 1977 (D.C. Law 2-23; 24 DCR 792), as amended by the Soil Erosion and Sedimentation Control Amendment Act of 1994, effective August 26, 1994, (D.C. Law 10-166; 41 DCR 4892; 21 DCMR §§ 500 -15); Uniform Environmental Covenants Act of 2005, effective May 12, 2006, as amended (D.C. Law 16-95; D.C. Official Code §§ 8-671.01 et seq. (2008 Repl.)); Water Pollution Control Act of 1984, effective March 16, 1985, as amended (D.C. Law 5-188; D.C. Official Code §§ 8-103.01 et seq. (2008 Repl. & 2012 Supp.)); and Mayor's Order 2006-61, dated June 14, 2006, and its delegations of authority.