reglab/statecodes huggingface dataset:
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.58 - Guidance Documents

Current through June 14, 2024
A. Issuance - The
				  Department is authorized to issue guidance documents that support the intent
				  and purpose of these Rules. Such guidance documents shall not serve to alter
				  the intent of the Rules herein. The documents may serve as guidance on
				  interpreting the evolving science and technologies that are used to support the
				  Rules or to explain in further detail the administrative procedures for
				  complying with these Rules.
B.
				  Review - Department prepared guidance documents shall be subject to review and
				  comment through either formal public notice, the Technical Review Committee
				  (§
										6.41(G)(2)
				  of this Part), or through other Department convened stakeholder groups. Once a
				  guidance document is issued by the Department, it shall be subject to, at
				  minimum, an annual review, at which time all comments received within the past
				  year shall be considered.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.59 - Figure 1: Leachfield Over Restrictive Layer or Bedrock

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.60 - Figure 2: Minimum Setback Distances in Drinking Water Supply Watershed Critical Resource Areas

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.61 - Figure 3: Minimum Setback Distances in the Salt Pond and Narrow River Critical Resource Areas

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.62 - Figure 4: Grease Tanks

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.63 - Figure 5: Septic Tanks

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.64 - Figure 6: Septic Tank Riser Detail

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.65 - Figure 7: Leachfield Construction, Invert of Distribution Lines Below Original Grade

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.66 - Figure 8: Leachfield Construction, Invert of Distribution Lines Above Original Grade

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.67 - Figure 9: Leachfield Construction on Sloping Sites

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.68 - Figure 10: Shallow Concrete Chambers

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.69 - Figure 11: Category 1 Technology and Pressurized Drainfield Schematic

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.70 - Figure 12: Category 2 Technology and Pressurized Drainfield Schematic

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.71 - Figure 13: Demand Dosing Tank with Centrifugal Pump

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.72 - Figure 14: Demand Dosing Tank with Multi-stage Centrifugal Pump

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.73 - Figure 15: Timed-dosing Tank with Centrifugal Pump and In-line Screen

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.74 - Figure 16: Timed-dosing Tank with Centrifugal Pump and Basket Screen

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.75 - Figure 17: Timed-dosing Tank with Screened Vault and Multistage Centrifugal Pump

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.76 - Figure 18: Above-ground Bottomless Sand Filter (Side View

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.77 - Figure 19: In-ground Bottomless Sand Filter (Side View)

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.78 - Figure 20: Typical Bottomless Sand Filter (Top View

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.79 - Figure 21: Side View Detail - Typical Bottomless Sand Filter

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.80 - Figure 22: Orifice Shield Detail: Note: Shields Shall Be Able to Drain. Details Vary from Manufacturer

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.81 - Figure 23: BSF Flushing Valve Choice Detail

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.82 - Figure 24: BSF Flushing Valve Choice Detail

Current through June 14, 2024
Click
					 here to view
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.83 - Figure 25: PSND Cross Section Detail (Long Side)

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.84 - Figure 26: LPP Details for Regular Trenches (Top and Isometric Views)

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.85 - Figure 27: LPP Details for Shallow Concrete Chambers (Top and Isometric Views)

Current through June 14, 2024
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.86 - Figure 28: South Shore Salt Ponds Critical Resource Area

Current through June 14, 2024
For a detailed look at a location, go to the DEM website,
					 go to "Maps," go to "Environmental Resource Maps" and build a map of your
					 choice.
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.87 - Figure 29: Narrow River Critical Resource Area

Current through June 14, 2024
For a detailed look at a location, go to the DEM website,
					 go to "Maps," go to "Environmental Resource Maps" and build a map of your
					 choice.
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.88 - Figure 30: Providence Water Supply Board Drinking Water Supply Watershed

Current through June 14, 2024
For a detailed look at a location, go to the DEM website,
					 go to "Maps," go to "Environmental Resource Maps" and build a map of your
					 choice.
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.89 - Figure 31: Cumberland, Pawtucket Water Supply Board and Woonsocket Drinking Water Supply Watersheds

Current through June 14, 2024
For a detailed look at a location, go to the DEM website,
					 go to "Maps," go to "Environmental Resource Maps" and build a map of your
					 choice.
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.90 - Figure 32: Newport, New Shoreham and Stone Bridge Fire District Drinking Water Supply Watersheds

Current through June 14, 2024
For a detailed look at a location, go to the DEM website,
					 go to "Maps," go to "Environmental Resource Maps" and build a map of your
					 choice.
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 6 - Rules Establishing Minimum Standards Relating to Location, Design, Construction and Maintenance of Onsite Wastewater Treatment Systems › Section 250-RICR-150-10-6.91 - Figure 33: Eleanor Slater/Zambarano Unit, Yawgoog Scout Reservation, and Jamestown Drinking Water Supply Watersheds

Current through June 14, 2024
For a detailed look at a location, go to the DEM website,
					 go to "Maps," go to "Environmental Resource Maps" and build a map of your
					 choice.
Click
					 here to view
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.1 - Purpose

Current through June 14, 2024
Provide standards for planning, designing and installing
					 effective stormwater best management practices (BMPs) to effectively manage the
					 impacts of stormwater and prevent adverse impacts to water quality, habitat and
					 flood storage capacity,
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.2 - Authority

Current through June 14, 2024
These rules are promulgated pursuant to requirements and
					 provisions of R.I. Gen. Laws Chapter 45-61.2, The Smart Development for a
					 Cleaner Bay Act of 2007; Chapter 46-12, Water Pollution; Chapter 46-13.1,
					 Groundwater Protection; Chapter 42-17.1, Environmental Management; and in
					 accordance with Chapter 42-35, Administrative Procedures.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.3 - Applicability

Current through June 14, 2024
A. Stormwater management required pursuant to
				  state and local programs that reference the "Rhode Island Stormwater Design and
				  Installation Standards Manual" shall be in accordance with the standards and
				  performance criteria in this Part;
B. The stormwater management standards and
				  performance criteria in this Part do not apply to single-family lots of record.
				  See the "State of Rhode Island Stormwater Management Guidance for Individual
				  Single-Family Residential Lot Development" for recommended procedures to comply
				  with requirements for stormwater management for development of single family
				  residential lots of record.
C. In
				  reviewing stormwater retrofit designs to improve water quality, as compared to
				  existing conditions, the approving agencies may approve designs that do not
				  meet the minimum standards or performance criteria herein due to existing site
				  constraints.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.4 - Incorporated Materials

Current through June 14, 2024
A. These regulations
				  hereby adopt and incorporate United States Department of Agriculture Natural
				  Resources Conservation Service Technical Release No. 55 (2015) by reference,
				  not including any further editions or amendments thereof and only to the extent
				  that the provisions therein are not inconsistent with these
				  regulations.
B. These regulations
				  hereby adopt and incorporate United States Department of Natural Resources
				  Conservation Service Technical Release No. 20 (2015) by reference, not
				  including any further editions or amendments thereof and only to the extent
				  that the provisions therein are not inconsistent with these
				  regulations.
C. These regulations
				  hereby adopt and incorporate ASTM D5126 - 16e1 Standard Guide for Comparison of
				  Field Methods for Determining Hydraulic Conductivity in Vadose Zone (2016) by
				  reference, not including any further editions or amendments thereof and only to
				  the extent that the provisions therein are not inconsistent with these
				  regulations.
D. These regulations
				  hereby adopt and incorporate ASTM D3385 - 18 Standard Test Method for
				  Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer (2018) by
				  reference, not including any further editions or amendments thereof and only to
				  the extent that the provisions therein are not inconsistent with these
				  regulations.
E. These regulations
				  hereby adopt and incorporate ASTM D5093 - 15e1 Standard Test Method for Field
				  Measurement of Infiltration Rate Using a Double-Ring Infiltrometer with
				  Sealed-Inner Ring (2015) by reference, not including any further editions or
				  amendments thereof and only to the extent that the provisions therein are not
				  inconsistent with these regulations.
F. These regulations hereby adopt and
				  incorporate ASTM D448 - 12 (2017) Standard Classification for Sizes of
				  Aggregates for Road and Bridge Construction (2017) by reference, not including
				  any further editions or amendments thereof and only to the extent that the
				  provisions therein are not inconsistent with these regulations.
G. These regulations hereby adopt and
				  incorporate ASTM C33/C33M -18 Standard Specification for Concrete Aggregates
				  (2018) by reference, not including any further editions or amendments thereof
				  and only to the extent that the provisions therein are not inconsistent with
				  these regulations.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.6 - Stormwater Management Standards and Performance Criteria Overview

Current through June 14, 2024
A. Applicants for all applicable new and
				  redevelopment projects in the State of Rhode Island are required to meet the
				  eleven minimum standards and comply with the specific performance criteria in
				  §§
										8.6 through
				  8.17 of this Part. In the
				  case of restoration or retrofitting, deviation from these standards may be
				  appropriate at the discretion of the approving agency.
B. All applicable project proposals must
				  include a stormwater management site plan for review by State and local
				  government. The plan must address the minimum standards in §§
										8.6 through
				  8.17 of this
				  Part.
C. When a project's
				  stormwater management system is designed, installed, and maintained in
				  accordance with the requirements of this Part, its runoff impacts will be
				  presumed to be in compliance with applicable state regulatory standards and
				  requirements.
D. Unless otherwise
				  noted, all storm events referred to herein are 24 hours in duration and utilize
				  US Natural Resources Conservation Service Type III precipitation distribution.
				  Rainfall amounts for Rhode Island for various return frequencies are provided
				  in §
										8.6(E) of
				  this Part and shall be used for design unless otherwise specified.
E. Design Rainfall Amounts for Rhode Island:
				  All Rhode Island County rainfall values were obtained from the Northeast
				  Regional Climate Center (NRCC) using regional rainfall data processed by NRCC
				  from the period of record through December 2008.
RI County
24-hour (Type III) Rainfall Amount
								  (inches)
1-Year
2-Year
5-Year
10-Year
25-Year
50-Year
100-Year
Providence County
2.7
3.3
4.1
4.9
6.1
7.3
8.7
Bristol County
2.8
3.3
4.1
4.9
6.1
7.3
8.6
Newport County
2.8
3.3
4.1
4.9
6.1
7.3
8.6
Kent County
2.7
3.3
4.1
4.8
6.2
7.3
8.7
Washington County
2.8
3.3
4.1
4.9
6.1
7.2
8.5
F.
				  If the standard or criterion is not used or achieved, a written technical
				  justification that is acceptable to the approving agency must be
				  provided.
G. The design practices
				  described in this Part shall be implemented by an individual with a
				  demonstrated level of professional competence, such as a professional engineer
				  licensed to practice in the State of Rhode Island.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.7 - Minimum Standard 1: Low Impact Development (LID) Site Planning and Design Strategies

Current through June 14, 2024
A. LID site planning
				  and design strategies must be used to the maximum extent practicable in order
				  to reduce the generation of the water runoff volume for both new and
				  redevelopment projects.
B.
				  Applicants need to document that the full list of approved LID methods and/or
				  procedures were explored at the site and need to supply a specific rationale in
				  the event LID strategies are rejected as infeasible. The site planning process
				  must be documented and include how the proposed project will meet the following
				  measures and/or methods to:
1. Protect as
				  much undisturbed open space as possible to maintain pre-development hydrology
				  and allow precipitation to naturally infiltrate into the ground;
2. Maximize the protection of natural
				  drainage areas, streams, surface waters, wetlands, and other regulated
				  areas;
3. Minimize land
				  disturbance, including clearing and grading, and avoid areas susceptible to
				  erosion and sediment loss;
4.
				  Minimize soil compaction and restore soils compacted as a result of
				  construction activities or prior development;
5. Provide low-maintenance, native vegetation
				  that encourages retention and minimizes the use of lawns, fertilizers, and
				  pesticides;
6. Minimize impervious
				  surfaces;
7. Minimize the decrease
				  in the "time of concentration" from pre-construction to post construction,
				  where "time of concentration" means the time it takes for runoff to travel from
				  the hydraulically most distant point of the drainage area to the point of
				  interest within a watershed;
8.
				  Infiltrate precipitation as close as possible to the point it reaches the
				  ground using vegetated conveyance and treatment systems;
9. Break up or disconnect the flow of runoff
				  over impervious surfaces; and
10.
				  Provide source controls to prevent or minimize the use or exposure of
				  pollutants into stormwater runoff at the site in order to prevent or minimize
				  the release of those pollutants into stormwater runoff.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.11 - Minimum Standard 5: Overbank Flood Protection (Qp)

Current through June 14, 2024
A.
				  Downstream overbank flood protection must be provided by attenuating the
				  post-development peak discharge rate to the pre-development levels for the
				  10-year and 100-year, 24-hour Type III design storm events. In addition,
				  designers must demonstrate that runoff from the site for storms up to the
				  100-year, 24-hour Type III design storm events actually reach proposed
				  structural practices designed to meet this criterion.
B. Peak flow attenuation is required for the
				  10-year and 100-year, 24-hour Type III design storm events.
C. For facility sizing criteria, the basis
				  for hydrologic and hydraulic evaluation of development sites are as follows:
1. The models TR-55, incorporated above at
				  §
											8.4(A) of
				  this Part, and TR-20, incorporated above at §
											8.4(B) of
				  this Part, (or approved equivalent) will be used for determining the required
				  storage and outlet structures for attenuating the peak flows from the 10-year
				  and 100-year, 24-hour Type III design storms.
2. The standard for characterizing
				  pre-development land use for on-site areas shall be woods, meadow, or
				  rangeland. For agricultural land, use a CN representing rangeland.
3. For purposes of computing runoff, all
				  pervious lands prior to development shall be assumed to be in good condition
				  regardless of conditions existing at the time of computation.
4. If an off-site area drains to a facility,
				  an applicant must also demonstrate safe passage of the 100-year event, based on
				  actual conditions upstream.
5. The
				  length of sheet flow used in tc calculations is limited to no more than 150
				  feet for pre-development conditions and 100 feet for post-development
				  conditions.
6. An applicant must
				  demonstrate that flows from the 100-year event will be safely conveyed to a
				  practice designed to manage the 100-year event.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.12 - Minimum Standard 6: Redevelopment and Infill Projects

Current through June 14, 2024
A.
				  Redevelopment does not apply to projects or portions of projects when the total
				  existing impervious area disturbed is less than 10,000 square feet. However,
				  specific regulatory programs may impose additional requirements. Any creation
				  of new impervious area over portions of the site that are currently pervious is
				  required to comply fully with the requirements of this Part. In no case on a
				  redevelopment project shall the levels of stormwater treatment and recharge be
				  less than the levels prior to initiation of the proposed project.
1. The permitting authority may take into
				  consideration prior projects or multiphase projects in determining if the
				  redevelopment threshold has been met.
2. Building demolition is included as an
				  activity defined as redevelopment, but building renovation is not.
3. Removal of roadway materials down to the
				  erodible soil surface is an activity defined as redevelopment, but simply
				  resurfacing of a roadway surface is not.
4. Pavement excavation and patching that is
				  incidental to the primary project purpose, such as replacement of a collapsed
				  storm drain, is not classified as redevelopment.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.13 - Minimum Standard 7: Pollution Prevention

Current through June 14, 2024
All development sites require the use of source control and
					 pollution prevention measures to minimize the impact that the land use may have
					 on stormwater runoff quality. These measures shall be outlined in a stormwater
					 pollution prevention plan.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.14 - Minimum Standard 8: Land Uses with Higher Potential Pollutant Loads

Current through June 14, 2024
A. Stormwater discharges from land uses with
				  higher potential pollutant loads (LUHPPLs) require the use of specific source
				  control and pollution prevention measures and the specific stormwater BMPs
				  approved for such use. Allowable BMPs for LUHPPLs are included in the Table in
				  §
										8.14(D) of
				  this Part. Many LUHPPLs require additional special permits such as a RIPDES
				  Multi-Sector General Permit, and sector-specific required BMPs are included in
				  Section VI of the Multi-Sector General Permit.
B. Stormwater runoff from a LUHPPL shall not
				  be recharged to groundwater, unless it has been adequately treated for the
				  pollutant of concern as determined by the approving agency. The recharge
				  prohibition at LUHPPLs applies only to stormwater discharges that come into
				  contact with the area or activity on the site that may generate the higher
				  potential pollutant load. In addition, infiltration practices should not be
				  used where subsurface contamination is present from prior land use due to the
				  increased threat of pollutant migration associated with increased hydraulic
				  loading from infiltration systems, unless the contamination is removed and the
				  site has been remediated, or if approved by DEM.
C. The following land uses and activities are
				  considered stormwater LUHPPLs:
1. Areas
				  within an industrial site (as defined in §
											1.4(A)(111)
				   of this Subchapter) that are the location of
				  activities subject to the RIPDES Multi-Sector General Permit (except where a No
				  Exposure Certification for Exclusion from RIPDES Stormwater Permitting has been
				  executed);
2. Auto fueling
				  facilities;
3. Exterior vehicle
				  service, maintenance and equipment cleaning areas;
4. Road salt storage and loading areas (if
				  exposed to rainfall);
5. Outdoor
				  storage and loading/unloading of hazardous substances; and
6. Disposal sites as defined in §
											8.5 of this
				  Part.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.15 - Minimum Standard 9: Illicit Discharges

Current through June 14, 2024
All illicit discharges to stormwater management systems are
					 prohibited, including discharges from OWTS, and sub-drains and French drains
					 near OWTSs that do not meet the State's Rules Establishing Minimum Standards
					 Relating to Location, Design, Construction and Maintenance of Onsite Wastewater
					 Treatment Systems.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.17 - Minimum Standard 11: Stormwater Management System Operation and Maintenance

Current through June 14, 2024
A. The stormwater
				  management system, including all structural stormwater controls and
				  conveyances, must have an Operation and Maintenance Plan to ensure that it
				  continues to function as designed. The Operation and Maintenance Plan shall
				  identify measures for implementing maintenance activities in a manner that
				  minimizes stormwater runoff impacts.
B. The long-term Operation and Maintenance
				  Plan shall at a minimum include:
1.
				  Stormwater management system(s) owners;
2. The party or parties responsible for
				  operation and maintenance, including how future property owners will be
				  notified of the presence of the stormwater management system and the
				  requirement for proper operation and maintenance;
3. The routine and non-routine maintenance
				  tasks for each BMP to be undertaken after construction is complete and a
				  schedule for implementing those tasks;
4. A plan that is drawn to scale and shows
				  the location of all stormwater BMPs in each treatment train along with the
				  discharge point;
5. A description
				  and delineation of public safety features;
6. An estimated operation and maintenance
				  budget; and
7. Funding source for
				  operation and maintenance activities and equipment.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.18 - LID Stormwater Credit: Rooftop, Roadway, Driveway or Parking Lot Runoff Directed to Qualifying Pervious Areas (QPAs)

Current through June 14, 2024
A. The LID
				  Stormwater Credit using QPAs may be used to reduce the required Recharge Volume
				  and Water Quality Volume, provided that any pervious surfaces used to treat and
				  infiltrate stormwater runoff meet the requirements set forth herein. The
				  application of the Credit does not relieve the design engineer or reviewer from
				  meeting the remaining minimum standards described in §§
										8.6 through
				  8.17 of this Part or the
				  standard of engineering practice associated with safe conveyance of stormwater
				  runoff and good drainage design.
B.
				  Stormwater Credit shall not be applied:
1. At
				  sites where stormwater runoff is directed to non-permeable soils, such as
				  bedrock and soils classified as Hydrologic Soil Group D;
2. At sites with urban fill, soils classified
				  as contaminated, and soils with a seasonal high groundwater elevation within 18
				  inches of the land surface.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.19 - Structural Stormwater Treatment Practices for Meeting Water Quality - Overview

Current through June 14, 2024
A.
										§§
										8.20 through
				  8.25 of this Part provide
				  the requirements for acceptable structural BMPs that can be used to meet the
				  water quality criteria in §
										8.9 of this Part. Sediment
				  volumes do not need to be calculated for sizing of the BMPs in §§
										8.20 through
				  8.25 of this
				  Part.
B. Minimum Design Criteria
				  for BMPs: If required design criteria for a particular BMP cannot be met at a
				  site, an alternative BMP must be selected, or adequate justification must be
				  provided to the approving agency why the particular criteria is not
				  practicable. Design requirements are provided for the following 6 categories:
1. Feasibility: Identify site considerations
				  that may restrict the use of a practice.
2. Conveyance: Convey runoff to the practice
				  in a manner that is safe, minimizes erosion and disruption to natural channels,
				  and promotes filtering and infiltration.
3. Pretreatment: Trap coarse elements before
				  they enter the facility, thus reducing the maintenance burden and ensuring a
				  long-lived practice.
4.
				  Treatment/Geometry: Provide the required water quality treatment through design
				  elements that provide the maximum pollutant removal.
5. Environmental/Vegetation: Reduce secondary
				  environmental impacts of facilities through features that minimize disturbance
				  of natural stream systems and comply with environmental regulations. Provide
				  vegetation that enhances the pollutant removal and aesthetic value of the
				  practice.
6. Maintenance: Maintain
				  the long-term performance of the practice through regular maintenance
				  activities, and through design elements that ease the maintenance
				  burden.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.20 - Wet Vegetated Treatment Systems (WVTS)

Current through June 14, 2024
A.
				  Feasibility
1. WVTS designs shall not be
				  located within jurisdictional waters, including wetlands; except that on
				  already developed sites, WTVS designs may be allowed in jurisdictional upland
				  buffers in areas already altered under existing conditions, if acceptable to
				  the approving agency.
2. WVTS
				  designs shall not be located within stream channels in order to prevent habitat
				  degradation caused by these structures.
3. Assess the hazard classification of the
				  structure and consider alternative placement and/or design refinements to
				  reduce or eliminate the potential for the structure being subject to the RI DEM
				  Rules and Regulations for Dam Safety, Part 130-05-1 of this Title.
4. The use of WVTS designs in watersheds
				  draining to cold-water fisheries is restricted to prohibit discharges within
				  200 feet of streams and any contiguous natural or vegetated wetlands.
				  Discharges beyond 200 feet shall be designed to discharge up to and including
				  the CPv through an underdrained gravel trench outlet. Additional storage for Qp
				  may be discharged through traditional outlet structures.
5. WVTS designs specified to manage LUHPPL
				  runoff require a 3-foot separation to groundwater. All other land uses do not
				  require groundwater separation.
6.
				  The volume below the surface elevation of the permanent pool shall not be
				  included in storage calculations for peak flow management (CPv/Qp).
7. Setbacks for WVTS designs from OWTSs shall
				  be consistent with the setbacks in DEM's Rules Establishing Minimum Standards
				  Relating to Location, Design, Construction and Maintenance of Onsite Wastewater
				  Treatment Systems.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.23 - Filtering Systems

Current through June 14, 2024
A. Feasibility
1. The bottom of filtering systems shall be
				  located at or above the seasonal high groundwater table. The top of filtering
				  systems shall be located at least 3 feet above the seasonal high groundwater
				  table.
2. Unlined filtering systems
				  greater than 1,000 square feet in size shall not be located within 15 feet of
				  any OWTS drainfield.
3. Design
				  criteria for tree filters is identical to bioretention practices.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.24 - Green Roofs

Current through June 14, 2024
A. Feasibility
1. The system shall have a maximum slope of
				  20%, unless specific measures from the manufacturer are provided to retain the
				  system on steeper slopes.
2. Green
				  roofs can meet water quality treatment goals only, and are not appropriate for
				  Rev, CPv, or Qp.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.25 - Open Channel Systems

Current through June 14, 2024
A. Feasibility
1. Open channels shall have a maximum
				  drainage area of 5 acres draining to any 1 inlet. No maximum drainage area if
				  flow enters via sheet flow along a linear feature, such as a road.
2. Open channels shall have a maximum
				  longitudinal slope of 4%, without check dams.
3. Wet Swales are constructed in groundwater.
				  The bottom of a Dry Swale shall be located at or above the seasonal high
				  groundwater table; the top of a Dry Swale shall be located at least 3 feet
				  above the seasonal high groundwater table.
4. Wet swales shall be placed a minimum 50
				  feet downgradient of any OWTS drainfield.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.26 - Pretreatment Practices Overview

Current through June 14, 2024
A. Pretreatment BMPs
				  are designed to improve water quality and enhance the effective design life of
				  practices by consolidating the maintenance to a specific location, but do not
				  meet the water quality performance standard in §
										8.9 of this Part on their
				  own. Pretreatment practices must be combined with an acceptable water quality
				  BMP §§
										8.20 through
				  8.25 of this Part to meet
				  the water quality standard.
B. If
				  required design criteria for a particular pretreatment BMP cannot be met at a
				  site, an alternative pretreatment BMP must be selected, or adequate
				  justification must be provided to the approving agency why the particular
				  criteria is not practicable.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.27 - Pretreatment - Grass Channel

Current through June 14, 2024
A. Grass channels
				  are similar to conventional drainage ditches, with the major differences being
				  flatter side and longitudinal slopes, as well as a slower design velocity for
				  small storm events.
B. Sizing of
				  the grass channel length is based on flow rate from the water quality storm
				  (WQf) and should be designed to ensure an average residence time of 10 minutes
				  to flow from the inlet to the outlet of the channel (for linear projects with
				  no defined primary inflow location, residence time shall be measured from the
				  mid-point location of the channel).
C. The following maintenance activities shall
				  be performed on an annual basis or more frequently as needed:
1. Sediment removal;
2. Mowing and litter and debris removal;
				  and
3. Stabilization of eroded side
				  slopes and bottom.
Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 150 - Water Resources › Subchapter 10 - Wastewater And Storm Water › Part 8 - Stormwater Management, Design and Installation Rules › Section 250-RICR-150-10-8.28 - Pretreatment - Filter Strips

Current through June 14, 2024
A. The filter strip
				  must abut the entire length of the contributing area to ensure that runoff from
				  all portions of the site are treated.
B. Maintenance
1. Ensure that grass has established; if not,
				  replace with an alternative species.
2. Filter strips shall be inspected at least
				  quarterly during the first year of operation and semiannually thereafter.
				  Evidence of erosion and concentrated flows within the filter strip must be
				  corrected immediately. Eroded spots must be reseeded and mulched to enhance a
				  vigorous growth and prevent future erosion problems.
3. The bulk of accumulated sediments will be
				  trapped at the initial entry point of the filter strip. These deposited
				  sediments shall be removed manually at least once per year or when accumulating
				  sediments cause a change in the grade elevation. Reseeding may be necessary to
				  repair areas damaged during the sediment removal process.
4. Filter strips, or areas proposed as such,
				  must be protected by proper SESC control techniques during all phases of
				  construction. These measures must be properly maintained until final site
				  stabilization and subsequent removal of all trapped sediments has
				  occurred.