Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 500 - STORMWATER MANAGEMENT › Appendix 096-500-C - Housekeeping

Current through 2024-29, July 17, 2024
These performance standards apply to all projects except for
				  stormwater PBR projects.
1. Spill prevention.
Controls must be used to
				  prevent pollutants from construction and waste materials stored on site to
				  enter stormwater, which includes storage practices to minimize exposure of the
				  materials to stormwater. The site contractor or operator must develop, and
				  implement as necessary, appropriate spill prevention, containment, and response
				  planning measures.
NOTE
: Any spill or release of toxic or hazardous
				  substances must be reported to the Department. For oil spills, call
				  1-800-482-0777 which is available 24 hours a day. For spills of toxic or
				  hazardous material, call 1-800-452-4664 which is available 24 hours a day. For
				  more information, visit the Department's website at:
http://www.maine.gov/dep/spills/emergspillresp/
2. Groundwater protection.
During construction,
				  liquid petroleum products and other hazardous materials with the potential to
				  contaminate groundwater may not be stored or handled in areas of the site
				  draining to an infiltration area. An "infiltration area" is any area of the
				  site that by design or as a result of soils, topography and other relevant
				  factors accumulates runoff that infiltrates into the soil. Dikes, berms, sumps,
				  and other forms of secondary containment that prevent discharge to groundwater
				  may be used to isolate portions of the site for the purposes of storage and
				  handling of these materials. Any project proposing infiltration of stormwater
				  must provide adequate pre-treatment of stormwater prior to discharge of
				  stormwater to the infiltration area, or provide for treatment within the
				  infiltration area, in order to prevent the accumulation of fines, reduction in
				  infiltration rate, and consequent flooding and destabilization.
See Appendix D for license by rule standards for infiltration
				  of stormwater.
NOTE
: Lack of appropriate pollutant removal best
				  management practices (BMPs) may result in violations of the groundwater quality
				  standard established by
				   38 M.R.S.A.
				  §465-C(1).
3. Fugitive sediment and dust.
Actions must be
				  taken to ensure that activities do not result in noticeable erosion of soils or
				  fugitive dust emissions during or after construction. Oil may not be used for
				  dust control, but other water additives may be considered as needed. A
				  stabilized construction entrance (SCE) should be included to minimize tracking
				  of mud and sediment. If off-site tracking occurs, public roads should be swept
				  immediately and no less than once a week and prior to significant storm events.
				  Operations during dry months, that experience fugitive dust problems, should
				  wet down unpaved access roads once a week or more frequently as needed with a
				  water additive to suppress fugitive sediment and dust.
NOTE
: Dewatering a stream without a permit from
				  the Department may violate state water quality standards and the
Natural Resources Protection Act
.
4. Debris and other materials.
Minimize the
				  exposure of construction debris, building and landscaping materials, trash,
				  fertilizers, pesticides, herbicides, detergents, sanitary waste and other
				  materials to precipitation and stormwater runoff. These materials must be
				  prevented from becoming a pollutant source.
NOTE
: To prevent these materials from becoming a
				  source of pollutants, construction and post-construction activities related to
				  a project may be required to comply with applicable provision of rules related
				  to solid, universal, and hazardous waste, including, but not limited to, the
				  Maine solid waste and hazardous waste management rules; Maine hazardous waste
				  management rules; Maine oil conveyance and storage rules; and Maine pesticide
				  requirements.
5. Excavation de-watering.
Excavationde-watering
				  is the removal of water from trenches, foundations, coffer dams, ponds, and
				  other areas within the construction area that retain water after excavation. In
				  most cases the collected water is heavily silted and hinders correct and safe
				  construction practices. The collected water removed from the ponded area,
				  either through gravity or pumping, must be spread through natural wooded
				  buffers or removed to areas that are specifically designed to collect the
				  maximum amount of sediment possible, like a cofferdam sedimentation basin.
				  Avoid allowing the water to flow over disturbed areas of the site. Equivalent
				  measures may be taken if approved by the Department.
NOTE
: Dewatering controls are discussed in the
				  "Maine Erosion and Sediment Control BMPs, Maine Department of Environmental
				  Protection."
6. Authorized Non-stormwater discharges.
Identify and prevent contamination by non-stormwater discharges. Where
				  allowed non-stormwater discharges exist, they must be identified and steps
				  should be taken to ensure the implementation of appropriate pollution
				  prevention measures for the non-stormwater component(s) of the discharge.
				  Authorized non-stormwater discharges are:
(a) Discharges from firefighting activity;
(b) Fire hydrant flushings;
(c) Vehicle washwater if detergents are not used and washing
				  is limited to the exterior of vehicles (engine, undercarriage and transmission
				  washing is prohibited);
(d) Dust control runoff in accordance with permit conditions
				  and Appendix (C)(3);
(e) Routine external building washdown, not including surface
				  paint removal, that does not involve detergents;
(f) Pavement washwater (where spills/leaks of toxic or
				  hazardous materials have not occurred, unless all spilled material had been
				  removed) if detergents are not used;
(g) Uncontaminated air conditioning or compressor condensate;
(h) Uncontaminated groundwater or spring water;
(i) Foundation or footer drain-water where flows are not
				  contaminated;
(j) Uncontaminated excavation dewatering (see requirements in
				  Appendix C(5));
(k) Potable water sources including waterline flushings;
				  and
(l) Landscape irrigation.
7. Unauthorized non-stormwater discharges .
The
				  Department's approval under this Chapter does not authorize a discharge that is
				  mixed with a source of non-stormwater, other than those discharges in
				  compliance with Appendix C (6). Specifically, the Department's approval does
				  not authorize discharges of the following:
(a) Wastewater from the washout or cleanout of concrete,
				  stucco, paint, form release oils, curing compounds or other construction
				  materials;
(b) Fuels, oils or other pollutants used in vehicle and
				  equipment operation and maintenance;
(c) Soaps, solvents, or detergents used in vehicle and
				  equipment washing; and
(d) Toxic or hazardous substances from a spill or other
				  release.
(8) Additional requirements.
Additional
				  requirements may be applied on a site-specific basis.