A02_-_Technical_Exhibit_2_-_Maryland_Stormwater_Management_Guidelines_fo....pdf

1800 Washington Boulevard Baltimore, MD 21230-1718 www.mde.maryland.gov

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INTRODUCTION

MARYLAND DEPARTMENT OF THE ENVIRONMENT

SWM GUIDELINES

FOR STATE AND FEDERAL PROJECTS

1.0 PURPOSE AND AUTHORITY

1.1 Incorporation by Reference

2.0 DEFINITIONS

3.0 APPLICABILITY

3.1 Scope

3.2 Exemptions

3.3 Waivers

3.4 Variance

3.5 New Development

3.6 Redevelopment

3.7 Combination of New Development and Redevelopment

3.8 Alternative Management Measures

3.9 Compensatory Stormwater Management

3.10 Agency/Institutional Management Plan

4.0 STORMWATER MANAGEMENT CRITERIA

4.1 Minimum Control Requirements

4.2 Stormwater Management Measures

4.3 Specific Design Criteria

5.0 STORMWATER MANAGEMENT PLANS

5.1 Review and Approval of Stormwater Management Plans

5.2 Preparation of the Stormwater Management Plan

5.3 Contents of the Stormwater Management Plan

Concept Plan.

Site Development Plan

Final Stormwater Management Plan.

Stormwater Management Report.

E. Stormwater Management Construction Drawings.

6.0 INSPECTION

6.1 Inspection Schedule and Reports

6.2 Inspection Requirements During Construction for As-Built Certification

7.0 MAINTENANCE

Appendix

APPLICATION FOR SEDIMENT CONTROL/STORMWATER MANAGEMENT

PLAN APPROVAL

A completed application must be provided with EACH submittal

__ INITIAL SUBMITTAL

DATE ____________________

__ RESUBMITTAL: MDE NO. __ __-SF-__ __ __ __

__ MODIFICATION REQUEST: MDE NO. __ __-SF-__ __ __ __

CONTRACT NUMBER: ________________________________

PROJECT DESCRIPTION: ________________________________

PROJECT DISTURBANCE (ACRES): ________________________________

PROJECT LOCATION (TOWN): ________________________________

PROJECT LOCATION (COUNTY): ________________________________

INFORMATION ENCLOSED: ________________________________

APPLICANT NAME: ________________________________

APPLICANT ADDRESS: ________________________________

APPLICANT CONTACT NAME: ________________________________

APPLICANT PHONE NUMBER: ________________________________

APPLICANT FAX NUMBER: ________________________________

APPLICANT e-mail: ________________________________

CONSULTANT NAME: ________________________________

PROJECT ENGINEER: ________________________________

CONSULTANT ADDRESS: ________________________________

CONSULTANT CONTACT NAME: ________________________________

CONSULTANT PHONE NUMBER: ________________________________

CONSULTANT FAX NUMBER: ________________________________

CONSULTANT e-mail: ________________________________

MARYLAND DEPARTMENT OF THE ENVIRONMENT

Water Management Administration

Sediment & Stormwater Plan Review Division 1800 Washington Boulevard, 4th Floor, Suite 440

Baltimore, MD 21230-1708 Telephone: 410-537-3563

Fax: 410-537-3553 www.mde.state.md.us

STORMWATER MANAGEMENT WAIVER APPLICATION

If a project involves a waiver request for more than one (1) drainage area, a Stormwater Management Waiver Application is required for each point of investigation (POI).

OWNER’S / DEVELOPER’S CERTIFICATION

DESIGN CERTIFICATION

TABLE 1

COUNTY QP2 QP10

Allegany NO See Note 1

Anne Arundel NO See Note 1

Baltimore (County & City) NO See Note 1

Calvert NO See Note 1

Caroline YES NO

Carroll NO See Note 1

Cecil See Note 2 See Note 1

Charles NO See Note 1

Dorchester YES NO

Frederick NO YES

Garrett NO See Note 1

Harford NO YES

Howard NO See Note 1

Kent YES See Note 1

Montgomery NO See Note 1

Prince George's NO See Note 1

Queen Anne's YES NO

St. Mary's NO See Note 1

Somerset YES NO

Talbot YES NO

Washington NO YES

Wicomico YES NO

Worcester YES NO

1. Qp10 is required where there are downstream flooding issues or conveyance is inadequate.

2. Qp2 is required in the Coastal Plain (south of the Chesapeake & Delaware Canal).

TABLE 2

WATERWAY LIMITS

As-Built Certification and Tables

PROJECT NAME: MDE NO:

AS-BUILT DATA FOR ESD PRACTICES

* TO BE COMPLETED BY THE CERTIFYING ENGINEER

TYPE OF ESD PRACTICE

ID

NUMBER

DESIGN

FEATURE

*AS-BUILT FEATURE

GREEN ROOF

PERMEABLE PAVEMENT

REINFORCED TURF

DISCONNECTION OF ROOFTOP

RUNOFF

DISCONNECTION OF NON-

ROOFTOP RUNOFF

SHEETFLOW TO CONSERVATION

AREA

RAINWATER HARVESTING

(CISTERN OR RAIN BARREL)

SUBMERGED GRAVEL WETLAND

LANDSCAPE INFILTRATION

INFILTRATION BERM

DRY WELL

MICRO-BIORETENTION

RAIN GARDEN

SWALE

ENHANCED FILTER

NOTE TO DESIGNER: List all the applicable ESD practices. Include the relevant design feature(s) for the specific ESD practice.

DATE AS-BUILT ACCEPTED BY MDE:______________________________________________

AS-BUILT DATA FOR FILTERS (Sand filters and Bioretention)

* TO BE COMPLETED BY THE CERTIFYING ENGINEER

TYPE OF FACILITY: BMP ID:

FEATURE DESIGN *AS-BUILT

FOREBAY AREA & VOLUME

FILTER BED DIMENSIONS (L x W x D)

FILTER BED SURFACE ELEVATION

FILTER INLET PIPE SIZE / INVERT

ELEVATION

OUTLET PIPE (UNDERDRAIN) SIZE /

INVERT ELEV.

THICKNESS OF FILTER MEDIA

PLACEMENT OF GEOTEXTILE

PLANTINGS

COMPOSITION OF FILTER MEDIA

OBSERVATION WELL WITH DEPTH TO

FILTER BOTTOM INDICATED ON CAP

NOTE TO DESIGNER: It may be necessary to add and/or delete features as appropriate for the specific BMP.

DATE AS-BUILT ACCEPTED BY MDE: ________________________________________________

AS-BUILT DATA FOR OPEN CHANNELS (Dry / Wet Swales)

*TO BE COMPLETED BY THE CERTIFYING ENGINEER

TYPE OF FACILITY: BMP NO:

FEATURE DESIGN *AS-BUILT

BOTTOM WIDTH

TOTAL LENGTH

STORAGE VOLUME

NUMBER OF CHECK DAMS / WEIRS

1-YEAR FREEBOARD

10-YEAR FREEBOARD

SIDE SLOPE RATIO(S)

MAXIMUM CHANNEL SLOPE

UNDERDRAIN PIPE DIAMETER

THICKNESS OF FILTER MEDIA

COMPOSITION OF FILTER MEDIA

NOTE TO DESIGNER: It may be necessary to add and/or delete features as appropriate for the

DATE AS-BUILT ACCEPTED BY MDE: ______________________________________________

AS-BUILT DATA FOR INFILTRATION TRENCHES

*TO BE COMPLETED BY THE CERTIFYING ENGINEER

BMP ID:

FEATURE DESIGN *AS-BUILT

BOTTOM ELEVATION

SURFACE ELEVATION

SURFACE DIMENSIONS (W x L)

BOTTOM DIMENSIONS (W x L)

STORAGE VOLUME

OBSERVATION WELL WITH DEPTH TO

TRENCH BOTTOM INDICATED ON CAP

MEDIA TYPE / THICKNESS

NOTE TO DESIGNER: It may be necessary to add and/or delete features as appropriate for the

DATE AS-BUILT ACCEPTED BY MDE: _______________________________________________

AS-BUILT DATA FOR INFILTRATION BASINS

*TO BE COMPLETED BY THE CERTIFYING ENGINEER

BMP ID:

FEATURE DESIGN *AS-BUILT

BOTTOM ELEVATION

SURFACE ELEVATION

SURFACE DIMENSIONS (W x L)

BOTTOM DIMENSIONS (W x L)

STORAGE VOLUME

PRINCIPAL SPILLWAY: DIAM /ELEV OUT /GRADE

/LENGTH

EMERGENCY SPILLWAY: WIDTH / LENGTH / ELEV

OUTLET PROTECTION: LENGTH/WIDTH/STONE SIZE

FOREBAY DIMENSIONS/VOLUME

FOREBAY WEIR LENGTH/ELEVATION

NOTE TO DESIGNER: It may be necessary to add and/or delete features as appropriate for the

DATE AS-BUILT ACCEPTED BY MDE: _______________________________________________

1/2

AS-BUILT DATA FOR PONDS / WETLANDS

* TO BE COMPLETED BY THE CERTIFYING ENGINEER

TYPE OF FACILITY: BMP NO:

FEATURE DESIGN *AS-BUILT

FOREBAY DIMENSIONS (W x L x D)

FOREBAY VOLUME

FOREBAY WEIR LENGTH / ELEVATION

WQ STORAGE VOLUME

CPv STORAGE VOLUME

2-YR STORAGE VOLUME

10-YR STORAGE VOLUME

100-YR STORAGE VOLUME

WQ STORAGE ELEVATION

CPv STORAGE ELEVATION

2-YR STORAGE ELEVATION

10-YR STORAGE ELEVATION

100-YR STORAGE ELEVATION

CPv DISCHARGE (CFS)

2 -YR DISCHARGE (CFS)

10-YR DISCHARGE (CFS)

100-YR DISCHARGE (CFS)

CPv CONTROL OPENING SIZE / INVERT ELEV.

2-YR CONTROL OPENING SIZE / INVERT ELEV.

10-YR CONTROL OPENING SIZE / INVERT ELEV.

PRINCIPAL SPILLWAY: DIAMETER / INVERT IN /

INVERT OUT

PRINCIPAL SPILLWAY: LENGTH / SLOPE

2/2

EMERGENCY SPILLWAY: WIDTH / LENGTH / ELEV.

OUTLET PROTECTION: (W x L x D)

OUTLET PROTECTION: STONE SIZE

NOTE TO DESIGNER: It may be necessary to add and/or delete features as appropriate for the

DATE AS-BUILT ACCEPTED BY MDE: ________________________________________________

AS-BUILT DATA FOR FLOW SPLITTERS

* TO BE COMPLETED BY THE CERTIFYING ENGINEER

STRUCTURE NO:

FEATURE DESIGN *AS-BUILT

INFLOW OPENING SIZE / INVERT ELEVATION

DIVERSION OPENING SIZE / INVERT

ELEVATION

BYPASS WEIR LENGTH / INVERT ELEVATION

BYPASS OPENING SIZE / INVERT ELEVATION

NOTE TO DESIGNER: It may be necessary to add and/or delete features as appropriate for the

DATE AS-BUILT ACCEPTED BY MDE: ______________________________________________

Maintenance Schedules

STORMWATER MAINTENANCE SCHEDULE

BIORETENTION

1/2

Inspection Item Frequency of Inspection Inspection Requirements Remedial Action

Bioretention Basin

Vegetative Surfaces

Debris and Trash Cleanout

Structural Components

BIORETENTION

2/2

Outlets

Pretreatment Forebays

Grass Channel Conveyance Systems

Overall Function of the Facility

DRY SWALE

1/2

Inspection Item Frequency of

Inspection Inspection

Requirements Remedial Action

Swale Surface

Vegetative Surfaces

Debris and Trash Cleanout

Structural Components

DRY SWALE

2/2

Outlets

Pretreatment Forebays

Grass Channel Conveyance Systems

Overall Function of the Facility

WET SWALE

Inspection Item Frequency of

Inspection Inspection Requirements Remedial Action

Swale Surface

Debris and Trash Cleanout

Structural Components

Outlets

Pretreatment Forebays

Grass Channel Conveyance Systems

SURFACE SAND FILTER

1/2

Inspection Item Frequency of

Inspection Inspection Requirements Remedial Action

Filter Surface

Vegetative Surfaces

Debris and Trash Cleanout

Structural Components

Outlets

SURFACE SAND FILTER

2/2

Pretreatment Forebays

Grass Channel Conveyance Systems

UNDERGROUND SAND FILTER

Inspection Item Frequency of

Inspection Inspection Requirements Remedial Action

Filter Chambers

Debris and Trash Cleanout

Structural Components

Outlets

Pretreatment Forebays

Grass Channel Conveyance Systems

INFILTRATION TRENCH

Inspection Item Frequency of

Inspection Inspection Requirements Remedial Action

Filter Surface

Debris and Trash Cleanout

Structural Components

Outlets

Pretreatment Forebays

Grass Channel Conveyance Systems

INFILTRATION BASIN

1/3

Inspection Item Frequency of

Inspection Inspection Requirements Remedial Action

Riser and Outlet Structure

Pond Outlet

Embankment

2/3

Basin Area

Inlet Conveyance Systems

Pretreatment Forebays

STORMWATER MAINTENANCE PLAN

3/3

Emergency Spillway

Maintenance Access

PONDS

1/3

Inspection Item Frequency of

Inspection Inspection Requirements Remedial Action

Principal Spillway

Pond Outlet

Pond Embankment

2/3

Pool/Basin Area

Pond Inlet Conveyance Systems

Forebays and Micropools

Emergency Spillway

Maintenance Access

3/3

Stormwater Wetlands

ENVIRONMENTAL SENSITIVE DESIGN

1/4

Practice Frequency of Inspection

Preventive Maintenance

Maintenance Requirements

Green Roofs

Permeable Pavements

Reinforced Turf

Rainwater Harvesting (Cisterns and Rain Barrels)

2/4

Submerged Gravel Wetlands

Landscape Infiltration

Infiltration Berms

3/4

Dry Wells

Micro-Bioretention

Rain Gardens

4/4

Swales

Enhanced Filters