Attachment Q - Spc 100 Final Specs Appendix D - (With Placeholders).pdf

Appendix D

Environmental Concurrence and Project Permit

Documents (With

Placeholders)

PROJECT STORMWATER MANAGEMENT PLAN

STORMWATER MANAGEMENT PLAN

FOR THE PROPOSED

USCG OCR Homeport Initiative OPC Pier

LOCATED AT:

Naval Station Newport

1 Simonpietri Drive

Newport, RI 02841

Prepared by

STANTEC

December 19, 2025

(This page intentionally left blank)

Stormwater Management Plan for

NAVSTA Newport, Rhode Island i

This Stormwater Management Plan is a compilation of the four key elements of a Stormwater Management Plan as described on the following Rhode Island (RI) Department of Environment (DOE) Office of Water Resources Stormwater Management Plan Guide. Each of the four key documents are attached in an Appendix. Supplemental information for each document is included as an Attachment to the Appendix.

This Stormwater Management Plan includes the following:

Stormwater Management Plan Guidance Appendix A – Stormwater Manual Appendix A Checklists Appendix B – Stormwater Site Planning, Analysis, and Design Report Appendix C – Soil Erosion, Runoff, and Sediment Control Plan Appendix D – Post Construction Operation and Maintenance

Appendix A: Stormwater Manual Appendix A Checklist for

A-1

APPENDIX A

STORMWATER MANUAL APPENDIX A CHECKLIST

Appendix A: Stormwater Manual Appendix A Checklist for

A-2

Stormwater Management, Design, and Installation Rules (250-RICR-150-10-8)

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-1

Updated 09/2020

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST

AND LID PLANNING REPORT – STORMWATER DESIGN SUMMARY

PROJECT NAME

(RIDEM USE ONLY)

STW/WQC File #:

Date Received:

TOWN

Newport

BRIEF PROJECT DESCRIPTION:

Establish pier, and shoreside support laydown space for four (4) Offshore Patrol

Cutters (OPCs) at NAVSTA Newport.

Stormwater Management Plan (SMP) Elements – Minimum Standards When submitting a SMP,1 submit four separately bound documents: Appendix A Checklist; Stormwater Site Planning, Analysis and Design Report with Plan Set/Drawings; Soil Erosion and Sediment Control (SESC) Plan, and Post Construction

Operations and Maintenance (O&M) Plan. Please refer to Suggestions to Promote Brevity.

Note: All stormwater construction projects must create a Stormwater Management Plan (SMP). However, not every element listed below is required per the RIDEM Stormwater Rules and the RIPDES Construction General Permit (CGP). This checklist will help identify the required elements to be submitted with an Application for Stormwater Construction Permit & Water

Quality Certification.

PART 1. PROJECT AND SITE INFORMATION

PROJECT TYPE (Check all that apply)

☐ Residential ☐ Commercial ☒ Federal ☐ Retrofit ☐ Restoration

☐ Road ☐ Utility ☐ Fill ☐ Dredge ☐ Mine

☐ Other (specify):

SITE INFORMATION

☒ Vicinity Map

INITIAL DISCHARGE LOCATION(S): The WQv discharges to: (You may choose more than one answer if several discharge points are associated with the project.)

☐ Groundwater ☒ Surface Water ☒ MS4

☐ GAA ☐ Isolated Wetland ☐ RIDOT

☐ GA ☒ Named Waterbody ☐ RIDOT Alteration Permit is Approved

☐ GB ☐ Unnamed Waterbody Connected to Named

Waterbody

☐ Town

☒ Other (specify): NAVSTA Storm Sewer

ULTIMATE RECEIVING WATERBODY LOCATION(S): Include pertinent information that applies to both WQv and flow from larger storm events including overflows. Choose all that apply, and repeat table for each waterbody.

☐ Groundwater or Disconnected Wetland ☐ SRWP

☒ Waterbody Name: Narragansett Bay ☐ Coldwater ☐ Warmwater ☐ Unassessed

☒ Waterbody ID: RI0007030E-01 ☒ 4th order stream of pond 50 acres or more

☐ TMDL for: ☐ Watershed of flood prone river (e.g., Pocasset River)

☐ Contributes to a priority outfall listed in the TMDL ☐ Contributes stormwater to a public beach

☒ 303(d) list – Impairment(s) for: SEDIMENT BIOASSAY

☐ Contributes to shellfishing grounds

1 Applications for a Construction General Permit that do not require any other permits from RIDEM and will disturb less than 5 acres over the entire course of the project do not need to submit a SMP. The Appendix A checklist must still be submitted.

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-2

Updated 09/2020

PROJECT HISTORY

☒ RIDEM Pre- Application Meeting Meeting Date: March 25, 2025 ☒ Minutes Attached

☐ Municipal Master Plan Approval Approval Date: ☐ Minutes Attached

☐ Subdivision Suitability Required Approval #:

☐ Previous Enforcement Action has been taken on the property Enforcement #:

FLOODPLAIN & FLOODWAY See Guidance Pertaining to Floodplain and Floodways

☒ Riverine 100-year floodplain: FEMA FLOODPLAIN FIRMETTE has been reviewed and the 100-year floodplain is on site

☒ Delineated from FEMA Maps

NOTE: Per Rule 250-RICR-150-10-8-1.1(B)(5)(d)(3), provide volumetric floodplain compensation calculations for cut and fill/displacement calculated by qualified professional

☒ Calculated by Professional Engineer

☒ Calculations are provided for cut vs. fill/displacement volumes proposed within the 100-year floodplain

Amount of Fill (CY): 5,963

Amount of Cut (CY): 12,000 (Dredging)

☐ Restrictions or modifications are proposed to the flow path or velocities in a floodway

☐ Floodplain storage capacity is impacted

☐ Project area is not within 100-year floodplain as defined by RIDEM

CRMC JURISDICTION

☒ CRMC Assent required (Federal Consistency Determination)

☐ Property subject to a Special Area Management Plan (SAMP). If so, specify which SAMP:

☒ Sea level rise mitigation has been designed into this project

LUHPPL IDENTIFICATION - MINIMUM STANDARD 8:

1. OFFICE OF Land Revitalization and Sustainable Materials Management (OLRSMM)

☒ Known or suspected releases of HAZARDOUS MATERIAL are present at the site

(Hazardous Material is defined in Rule 1.4(A)(33) of 250-140-30-1 of the RIDEM

Rules and Regulations for Investigation and Remediation of Hazardous Materials (the

Remediation Regulations))

RIDEM CONTACT:

☐ Known or suspected releases of PETROLEUM PRODUCT are present at the site

(Petroleum Product as defined in Rule 1.5(A)(84) of 250-140-25-1 of the RIDEM

Rules and Regulations for Underground Storage Facilities Used for Regulated

Substances and Hazardous Materials)

☐ This site is identified on the RIDEM Environmental Resources Map as one of the following regulated facilities

SITE ID#:

☒ CERCLIS/Superfund (NPL)

☐ State Hazardous Waste Site (SHWS)

☐ Environmental Land Usage Restriction (ELUR)

☐ Leaking Underground Storage Tank (LUST)

☐ Closed Landfill

Note: If any boxes in 1 above are checked, the applicant must contact the RIDEM OLRSMM Project Manager associated with the Site to determine if subsurface infiltration of stormwater is allowable for the project. Indicate if the infiltration corresponds to “Red,” “Yellow” or “Green” as described in Section 3.2.8 of the RISDISM Guidance (Subsurface

Contamination Guidance). Also, note and reference approval in PART 3, Minimum Standard 2: Groundwater

Recharge/Infiltration.

2. PER MINIMUM STANDARD 8 of RICR 8.14.C.1-6 “LUHPPLS,” THE SITE IS/HAS:

☐ Industrial Site with RIPDES MSGP, except where No Exposure Certification exists.

http://www.dem.ri.gov/programs/water/permits/ripdes/stormwater/status.php

☐ Auto Fueling Facility (e.g., gas station)

☐ Exterior Vehicles Service, Maintenance, or Equipment Cleaning Area

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-3

Updated 09/2020

☐ Road Salt Storage and Loading Areas (exposed to rainwater)

☐ Outdoor Storage and Loading/Unloading of Hazardous Substances

3. STORMWATER INDUSTRIAL PERMITTING

☐ The site is associated with existing or proposed activities that are considered Land

Uses with Higher Potential Pollutant Loads (LUHPPLS) (see RICR 8.14.C)

Activities:

Sector:

☐ Construction is proposed on a site that is subject to THE MULTI-SECTOR

GENERAL PERMIT (MSGP) UNDER RULE 31(B)15 OF THE RIPDES

REGULATIONS.

☐ Additional stormwater treatment is required by the MSGP

Explain:

REDEVELOPMENT STANDARD – MINIMUM STANDARD 6

☒ Pre Construction Impervious Area

☐ Total Pre-Construction Impervious Area (TIA) 2.85

☐ Total Site Area (TSA) 3.66

☐ Jurisdictional Wetlands (JW) 0

☐ Conservation Land (CL) 0

☒ Calculate the Site Size (defined as contiguous properties under same ownership)

☒ Site Size (SS) = (TSA) – (JW) – (CL) 3.66

☒ (TIA) / (SS) = 0.78 ☒ (TIA) / (SS) >0.4?

☒ YES, Redevelopment

PART 3. SUMMARY OF REMAINING STANDARDS

GROUNDWATER RECHARGE – MINIMUM STANDARD 2

YES NO

☐ ☒ The project has been designed to meet the groundwater recharge standard.

☒ ☐ If “No,” the justification for groundwater recharge criterion waiver has been explained in the Narrative (e.g., threat of groundwater contamination or physical limitation), if applicable (see RICR 8.8.D);

☒ ☐ Your waiver request has been explained in the Narrative, if applicable.

☐ ☒ Is this site identified as a Regulated Facility in Part 1, Minimum Standard 8: LUHPPL Identification?

If “Yes,” has approval for infiltration by the OLRSMM Site Project Manager, per Part 1, Minimum Standard 8, been requested?

TABLE 2-1: Summary of Recharge (see RISDISM Section 3.3.2)

(Add or Subtract Rows as Necessary)

Design Point

Impervious Area

Treated

(sq ft)

Total Rev

Required

(cu ft)

LID Stormwater

Credits (see

RISDISM Section

4.6.1)

Recharge

Required by

Remaining BMPs

(cu ft)

Recharge

Provided by

BMPs (cu ft) Portion of Rev directed to a

QPA (cu ft)

DP-1: ‘A’ N/A N/A N/A N/A N/A

DP-2: ‘B’ N/A N/A N/A N/A N/A

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-4

Updated 09/2020

DP-3: ‘C’ N/A N/A N/A N/A N/A

DP-4: ‘D’ N/A N/A N/A N/A N/A

TOTALS: N/A N/A N/A N/A N/A

Notes:

1. Only BMPs listed in RISDISM Table 3-5 “List of BMPs Acceptable for Recharge” may be used to meet the recharge requirement.

2. Recharge requirement must be satisfied for each waterbody ID.

☒ Indicate where the pertinent calculations and/or information for the above items are provided (i.e., name of report/document, page numbers, appendices, etc.): Stormwater Site Planning, Analysis and Design Report (Appendix B)

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-5

Updated 09/2020

WATER QUALITY – MINIMUM STANDARD 3

YES NO

☒ ☐ Does this project meet or exceed the required water quality volume WQv (see RICR 8.9.E-I)?

☒ ☐ Is the proposed final impervious cover greater than 20% of the disturbed area (see RICR 8.9.E-I)?

☐ ☐ If “Yes,” either the Modified Curve Number Method or the Split Pervious/Impervious method in Hydro-CAD was used to calculate WQv; or, ☒ ☐ If “Yes,” either TR-55 or TR-20 was used to calculate WQv; and, ☐ ☐ If “No,” the project meets the minimum WQv of 0.2 watershed inches over the entire disturbed area.

☐ ☐ Not Applicable

☒ ☐ Does this project meet or exceed the ability to treat required water quality flow WQf (see RICR 8.9.I.1-3)?

☒ ☐ Does this project propose an increase of impervious cover to a receiving water body with impairments?

If “Yes,” please indicate below the method that was used to address the water quality requirements of no further degradation to a low-quality water.

Two (2) bioretention areas have been added for water quality benefits within the project area. The area currently only contains two (2) hydrodynamic separators, which are to remain, and be utilized in series with the bioretention areas.

☐ ☐ RICR 8.36. A Pollutant Loading Analysis is needed and has been completed.

☐ ☐ The Water Quality Guidance Document (Water Quality Goals and Pollutant Loading Analysis Guidance for

Discharges to Impaired Waters) has been followed as applicable.

☐ ☒ BMPs are proposed that are on the approved technology list . If “Yes,” please provide all required worksheets from the manufacturer.

☐ ☐ Additional pollutant-specific requirements and/or pollutant removal efficiencies are applicable to the site as the result of a TMDL, SAMP, or other watershed-specific requirements.

If “Yes,” please describe:

TABLE 3-1: Summary of Water Quality (see RICR 8.9)

Design Point and

WB ID

Impervious area treated

(sq ft)

Total WQv

Required (cu ft)

LID Stormwater

Credits

(see RICR 8.18)

Water Quality

Treatment

Remaining

(cu ft)

Water Quality

Provided by

BMPs

(cu ft) WQv directed to a

QPA (cu ft)

DP-1: ‘A’ (NAVSTA Storm

Sewer to RI0007035-01)

Site Total Shown

Below* 0 3,267 0

DP-2: ‘B’ (NAVSTA Storm

Sewer to RI0007035-01) 27,198

Site Total Shown

Below* 5,940 0 5,940

DP-3: ‘C’ (NAVSTA Storm

Sewer to RI0007035-01) 57,791

Site Total Shown

Below* 5,160 0 5,160

DP-4: ‘D’ (NAVSTA Storm

Sewer to RI0007035-01)

Site Total Shown

Below* 5,160 0 5,160

TOTALS: 84,989 3,267* 11,100 0 11,100

Notes:

1. Only BMPs listed in RICR 8.20 and 8.25 or the Approved Technologies List of BMPs is Acceptable for Water Quality treatment.

2. For each Design Point, the Water Quality Volume Standard must be met for each Waterbody ID.

* WQV Calculated for the entire Site

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-6

Updated 09/2020

☒ YES

☐ NO

This project has met the setback requirements for each BMP.

If “No,” please explain: N/A (No infiltration proposed)

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-7

Updated 09/2020

CONVEYANCE AND NATURAL CHANNEL PROTECTION (RICR 8.10) – MINIMUM STANDARD 4

YES NO

☒ ☐ Is this standard waived? If “Yes,” please indicate one or more of the reasons below:

☒ The project directs discharge to a large river (i.e., 4th-order stream or larger. See RISDISM Appendix I for State-wide list and map of stream orders), bodies of water >50.0 acres in surface area (i.e., lakes, ponds, reservoirs), or tidal waters.

☐ The project is a small facility with impervious cover of less than or equal to 1 acre.

☐ The project has a post-development peak discharge rate from the facility that is less than 2 cfs for the 1-year, 24-hour Type III design storm event (prior to any attenuation). (Note: LID design strategies can greatly reduce the peak discharge rate).

☐ ☒ Conveyance and natural channel protection for the site have been met.

If “No,’ explain why: standard is waived

TABLE 4-1: Summary of Channel Protection Volumes (see RICR 8.10)

Design Point Receiving Water Body Name

Coldwater

Fishery?

(Y/N)

Total CPv

Required

(cu ft)

Total CPv

Provided

(cu ft)

Average

Release Rate

Modeled in the 1-yr storm

(cfs)

DP-1: ‘A’ RI0007030E-01 N N/A N/A N/A

DP-2: ‘B’ RI0007030E-01 N N/A N/A N/A

DP-3: ‘C’ RI0007030E-01 N N/A N/A N/A

DP-4: ‘D’ RI0007030E-01 N N/A N/A N/A

TOTALS:

Note: The Channel Protection Volume Standard must be met in each waterbody ID.

☐ YES

☐ NO

The CPv is released at roughly a uniform rate over a 24-hour duration (see examples of sizing calculations in

Appendix D of the RISDISM).

☐ YES

☐ NO

Do additional design restrictions apply resulting from any discharge to cold-water fisheries;

If “Yes,” please indicate restrictions and solutions below.

☐ Indicate below where the pertinent calculations and/or information for the above items are provided (i.e., name of report/document, page numbers, appendices, etc.).

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-8

Updated 09/2020

OVERBANK FLOOD PROTECTION (RICR 8.11) AND OTHER POTENTIAL HIGH FLOWS – MINIMUM

STANDARD 5

YES NO

☒ ☐ Is this standard waived? If yes, please indicate one or more of the reasons below:

☒ The project directs discharge to a large river (i.e., 4th-order stream or larger. See Appendix I for state-wide list and map of stream orders), bodies of water >50.0 acres in surface area (i.e., lakes, ponds, reservoirs), or tidal waters.

☐ A Downstream Analysis (see RICR 8.11.D and E) indicates that peak discharge control would not be beneficial or would exacerbate peak flows in a downstream tributary of a particular site (e.g., through coincident peaks).

☒ ☐ Does the project flow to an MS4 system or subject to other stormwater requirements?

If “Yes,” indicate as follows:

☐ RIDOT

☒ Other (specify): NAVSTA Newport Storm Sewer. A small portion of the site runoff sheet flows to an existing storm sewer network maintained by NAVSTA Newport eventually discharging to Narragansett

Bay.

Note: The project could be approved by RIDEM but not meet RIDOT or Town standards. RIDOT’s regulations indicate that post-volumes must be less than pre-volumes for the 10-yr storm at the design point entering the RIDOT system. If you have not already received approval for the discharge to an MS4, please explain below your strategy to comply with RIDEM and the

MS4.

Indicate below which model was used for your analysis.

☒ TR-55 ☐ TR-20 ☐ HydroCAD ☐ Bentley/Haestad ☐ Intellisolve

☒ Other (Specify): Hydraflow Hydrographs

YES NO

☒ ☐ Does the drainage design demonstrate that flows from the 100-year storm event through a BMP will safely manage and convey the 100-year storm? If “No,” please explain briefly below and reference where in the application further documentation can be found (i.e., name of report/document, page numbers, appendices, etc.):

☒ ☐ Do off-site areas contribute to the sub-watersheds and design points? If “Yes,”

☒ ☐ Are the areas modeled as “present condition” for both pre- and post-development analysis?

☒ ☐ Are the off-site areas shown on the subwatershed maps? (Those contributing to BMPs are included)

☒ ☐ Does the drainage design confirm safe passage of the 100-year flow through the site for off-site runoff?

☐ ☒ Is a Downstream Analysis required (see RICR 8.11.E.1)?

☒ ☐ Calculate the following:

☒ Area of disturbance within the sub-watershed (areas): 1.80 acres

☒ Impervious cover (%): 79

☐ ☒ Is a dam breach analysis required (earthen embankments over six (6) feet in height, or a capacity of 15 acre-feet or more, and contributes to a significant or high hazard dam)?

☐ ☒ Does this project meet the overbank flood protection standard?

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-9

Updated 09/2020

Table 5-1 Hydraulic Analysis Summary

Subwatershed

(Design Point)

1.2” Peak Flow

(cfs) **

1-yr Peak Flow

(cfs)

10-yr Peak Flow

(cfs)

100-yr Peak Flow

(cfs)

Pre (cfs) Post (cfs) Pre (cfs) Post (cfs) Pre (cfs) Post (cfs) Pre (cfs) Post (cfs)

DP-1: Point ‘A’ 0.494 0.467 1.27 1.21 2.28 2.16 4.04 3.84

DP-2: Point ‘B’ 0.777 0.691 2.33 2.25 4.38 3.86 7.94 6.87

DP-3: Point ‘C’ 1.35 0.990 3.59 2.63 6.47 4.51 11.48 11.04

DP-4: Point ‘D’ 0.69 0.69 1.76 1.76 3.05 3.05 5.37 5.37

TOTALS: 3.31 2.84 8.95 7.85 16.18 13.58 28.83 27.12

** Utilize modified curve number method or split pervious /impervious method in HydroCAD.

Note: The hydraulic analysis must demonstrate no impact to each individual subwatershed DP unless each DP discharges to the same wetland or water resource.

Indicate as follows where the pertinent calculations and/or information for the items above are provided

Name of report/document, page numbers, appendices, etc.

Existing conditions analysis for each subwatershed, including curve numbers, times of concentration, runoff rates, volumes, and water surface elevations showing methodologies used and supporting calculations.

Appendix B

Proposed conditions analysis for each subwatershed, including curve numbers, times of concentration, runoff rates, volumes, water surface elevations, and routing showing the methodologies used and supporting calculations.

Appendix B

Final sizing calculations for structural stormwater BMPs, including contributing drainage area, storage, and outlet configuration.

N/A

Stage-storage, inflow and outflow hydrographs for storage facilities (e.g., detention, retention, or infiltration facilities).

Appendix B

Table 5-2 Summary of Best Management Practices

BMP

ID

DP #

BMP Type

(e.g., bioretention, tree filter)

BMP Functions Bypass

Type

Horizontal Setback Criteria are met per RICR 8.21.B.10, 8.22.D.11, and 8.35.B.4

Pre-

Treatment

(Y/N/

NA)

Rev WQv

CPv

(Y/

N/

NA)

Overbank

Flood

Reduction

(Y/N/NA)

External (E)

Internal (I) or NA

Yes/

No

Technical

Justification

(Design

Report page number)

Distance

Provided

1 B Bioretention

Filter Basin Y N/A 5940 N/A N/A N/A N/A

No

Infiltration N/A

2 C Bioretention

Filter Basin Y N/A 5160 N/A N/A N/A N/A

No

Infiltration N/A

TOTALS: Y N/A 11100 N/A N/A N/A N/A N/A

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-10

Updated 09/2020

Table 5.3 Summary of Soils to Evaluate Each BMP

DP #

BMP

ID

BMP Type

(e.g., bioretention, tree filter)

Soils Analysis for Each BMP

Test Pit ID# and

Ground Elevation

SHWT

Elevation

(ft)

Bottom of

Practice

Elevation*

(ft)

Separation

Distance

Provided

(ft)

Hydrologic

Soil Group

(A, B, C, D)

Exfiltration

Rate

Applied

(in/hr) Primary Secondary

A, B, C, D 1, 2 bioretention N/A N/A N/A N/A N/A D N/A

TOTALS:

* No infiltration allowed within IR Site, therefore, no onsite soil permeability testing was complete.

LAND USES WITH HIGHER POTENTIAL POLLUTANTS LOADS (LUHPPLs) – MINIMUM STANDARD 8

YES NO N/A

☐ ☐ ☒ Describe any LUHPPLs identified in Part 1, Minimum Standard 8, Section 2. If not applicable, continue to

Minimum Standard 9.

☐ ☐ ☒ Are these activities already covered under an MSGP? If “No,” please explain if you have applied for an

MSGP or intend to do so?

☐ ☐ ☒ List the specific BMPs that are proposed for this project that receive stormwater from LUHPPL drainage areas. These BMP types must be listed in RISDISM Table 3-3, “Acceptable BMPs for Use at LUHPPLs.”

Please list BMPs:

☐ ☐ ☒ Additional BMPs, or additional pretreatment BMP’s if any, that meet RIPDES MSGP requirements;

Please list BMPs:

Indicate below where the pertinent calculations and/or information for the above items are provided (i.e., name of report/document, page numbers, appendices, etc.).

ILLICIT DISCHARGES – MINIMUM STANDARD 9

Illicit discharges are defined as unpermitted discharges to Waters of the State that do not consist entirely of stormwater or uncontaminated groundwater, except for certain discharges identified in the RIPDES Phase II Stormwater General Permit.

YES NO N/A

☐ ☒ ☐ Have you checked for illicit discharges?

☐ ☐ ☒ Have any been found and/or corrected? If “Yes,” please identify.

☐ ☐ ☒ Does your report explain preventative measures that keep non-stormwater discharges out of the Waters of the State (during and after construction)?

SOIL EROSION AND SEDIMENT CONTROL (SESC) – MINIMUM STANDARD 10

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-11

Updated 09/2020

YES NO N/A

☒ ☐ ☐ Have you included a Soil Erosion and Sediment Control Plan Set and/or Complete Construction Plan Set?

☒ ☐ ☐ Have you provided a separately-bound document based upon the SESC Template? If yes, proceed to

Minimum Standard 11 (the following items can be assumed to be addressed).

If “No,” include a document with your submittal that addresses the following elements of an SESC Plan:

☐ Soil Erosion and Sediment Control Plan Project Narrative, including a description of how the fifteen

(15) Performance Criteria have been met:

☐ Provide Natural Buffers and Maintain Existing Vegetation

☐ Minimize Area of Disturbance

☐ Minimize the Disturbance of Steep Slopes

☐ Preserve Topsoil

☐ Stabilize Soils

☐ Protect Storm Drain Inlets

☐ Protect Storm Drain Outlets

☐ Establish Temporary Controls for the Protection of Post-Construction Stormwater Control Measures

☐ Establish Perimeter Controls and Sediment Barriers

☐ Divert or Manage Run-On from Up-Gradient Areas

☐ Properly Design Constructed Stormwater Conveyance Channels

☐ Retain Sediment On-Site

☐ Control Temporary Increases in Stormwater Velocity, Volume, and Peak Flows

☐ Apply Construction Activity Pollution Prevention Control Measures

☐ Install, Inspect, and Maintain Control Measures and Take Corrective Actions

☐ Qualified SESC Plan Preparer’s Information and Certification

☐ Operator’s Information and Certification; if not known at the time of application, the Operator must certify the SESC Plan upon selection and prior to initiating site activities

☐ Description of Control Measures, such as Temporary Sediment Trapping and Conveyance Practices, including design calculations and supporting documentation, as required

STORMWATER MANAGEMENT SYSTEM OPERATION, MAINTENANCE, AND POLLUTION PREVENTION

PLAN – MINIMUM STANDARDS 7 AND 9

Operation and Maintenance Section

YES NO

☒ ☐ Have you minimized all sources of pollutant contact with stormwater runoff, to the maximum extent practicable?

☒ ☐ Have you provided a separately-bound Operation and Maintenance Plan for the site and for all of the BMPs, and does it address each element of RICR 8.17 and RISDISM Appendix C and E?

☒ ☐ Lawn, Garden, and Landscape Management meet the requirements of RISDISM Section G.7? If “No,” why not?

☒ ☐ Is the property owner or homeowner’s association responsible for the stormwater maintenance of all BMP’s?

If “No,” you must provide a legally binding and enforceable maintenance agreement (see RISDISM Appendix E, page 26) that identifies the entity that will be responsible for maintenance of the stormwater. Indicate where this agreement can be found in your report (i.e., name of report/document, page numbers, appendices, etc.).

☐ ☒ Do you anticipate that you will need legal agreements related to the stormwater structures? (e.g. off-site easements, deed restrictions, covenants, or ELUR per the Remediation Regulations).

If “Yes,” have you obtained them? Or please explain your plan to obtain them:

☐ ☒ Is stormwater being directed from public areas to private property? If “Yes,” note the following:

Note: This is not allowed unless a funding mechanism is in place to provide the finances for the long-term

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-12

Updated 09/2020 maintenance of the BMP and drainage, or a funding mechanism is demonstrated that can guarantee the long-term maintenance of a stormwater BMP by an individual homeowner.

Pollution Prevention Section

☒ ☐ Designated snow stockpile locations?

☒ ☐ Trash racks to prevent floatables, trash, and debris from discharging to Waters of the State?

☒ ☐ Asphalt-only based sealants?

☐ ☒ Pet waste stations? (Note: If a receiving water has a bacterial impairment, and the project involves housing units, then this could be an important part of your pollution prevention plan).

☒ ☐ Regular sweeping? Please describe:

☒ ☐ De-icing specifications, in accordance with RISDISM Appendix G. (NOTE: If the groundwater is GAA, or this area contributes to a drinking water supply, then this could be an important part of your pollution prevention plan).

☒ ☐ A prohibition of phosphate-based fertilizers? (Note: If the site discharges to a phosphorus impaired waterbody, then this could be an important part of your pollution prevention plan).

PART 4. SUBWATERSHED MAPPING AND SITE-PLAN DETAILS

Existing and Proposed Subwatershed Mapping (REQUIRED)

☒ ☐ Existing and proposed drainage area delineations

☒ ☐ Locations of all streams and drainage swales

☒ ☐ Drainage flow paths, mapped according to the DEM Guidance for Preparation of Drainage Area Maps

(included in RISDISM Appendix K)

☒ ☐ Complete drainage area boundaries; include off-site areas in both mapping and analyses, as applicable

☒ ☐ Logs of borings and/or test pit investigations along with supporting soils/geotechnical report

☐ ☒ Mapped seasonal high-water-table test pit locations

☐ ☒ Mapped locations of the site-specific borings and/or test pits and soils information from the test pits at the locations of the BMPs

☒ ☐ Mapped locations of the BMPs, with the BMPs consistently identified on the Site Construction Plans

☐ ☒ Mapped bedrock outcrops adjacent to any infiltration BMP

☒ ☐ Soils were logged by a:

☐ DEM-licensed Class IV soil evaluator

Name:

☒ RI-registered P.E.

Name: Haley & Aldrich, Inc.

Subwatershed and Impervious Area Summary

Subwatershed

(area to each design point)

First Receiving

Water ID or MS4

Area Disturbed

Acres

Existing Impervious

Acres

Proposed Impervious

Acres

DP-1: ‘A’ (RI0007035-01) (NAVSTA

Storm Sewer to RI0007035-01)

NAVSTA Storm

Sewer to RI0007035-

01)

0.47 0.45 0.42

DP-2: ‘B’ (NAVSTA Storm Sewer to

RI0007035-01)

NAVSTA Storm

Sewer to RI0007035-

01)

0.16 0.60 0.62

DP-3: ‘C’ (NAVSTA Storm Sewer to

RI0007035-01)

NAVSTA Storm

Sewer to RI0007035-

01)

1.15 1.14 1.33

APPENDIX A: STORMWATER MANAGEMENT PLAN CHECKLIST A-13

Updated 09/2020

DP-4: ‘D’ (NAVSTA Storm Sewer to

RI0007035-01)

NAVSTA Storm

Sewer to RI0007035-

01)

0 0.66 0.66

TOTALS: 1.78 2.85 3.03

Site Construction Plans (Indicate that the following applicable specifications are provided)

☒ ☐ Existing and proposed plans (scale not greater than 1” = 40’) with North arrow

☒ ☐ Existing and proposed site topography (with 1 or 2-foot contours); 10-foot contours accepted for off-site areas

☒ ☐ Boundaries of existing predominant vegetation and proposed limits of clearing

☒ ☐ Site Location clarification

☒ ☐ Location and field-verified boundaries of resource protection areas such as:

► freshwater and coastal wetlands, including lakes and ponds

► coastal shoreline features

Perennial and intermittent streams, in addition to Areas Subject to Storm Flowage (ASSFs)

☒ ☐ All required setbacks (e.g., buffers, water-supply wells, septic systems)

☒ ☐ Representative cross-section and profile drawings, and notes and details of structural stormwater management practices and conveyances (i.e., storm drains, open channels, swales, etc.), which include:

► Location and size of the stormwater treatment practices (type of practice, depth, area). Stormwater treatment practices (BMPs) must have labels that correspond to RISDISM Table 5-2;

► Design water surface elevations (applicable storms);

► Structural details of outlet structures, embankments, spillways, stilling basins, grade-control structures, conveyance channels, etc.;

► Existing and proposed structural elevations (e.g., inverts of pipes, manholes, etc.);

► Location of floodplain and, if applicable, floodway limits and relationship of site to upstream and downstream properties or drainage that could be affected by work in the floodplain;

► Planting plans for structural stormwater BMPs, including species, size, planting methods, and maintenance requirements of proposed planting

☒ ☐ Logs of borings and/or test pit investigations along with supporting soils/geotechnical report and corresponding water tables

☐ ☒ Mapping of any OLRSMM-approved remedial actions/systems (including ELURs)

☒ ☐ Location of existing and proposed roads, buildings, and other structures including limits of disturbance;

► Existing and proposed utilities (e.g., water, sewer, gas, electric) and easements;

► Location of existing and proposed conveyance systems, such as grass channels, swales, and storm drains, and location(s) of final discharge point(s) (wetland, waterbody, etc.);

► Cross sections of roadways, with edge details such as curbs and sidewalks;

► Location and dimensions of channel modifications, such as bridge or culvert crossings

☒ ☐ Locations, cross sections, and profiles of all stream or wetland crossings and their method of stabilization

Appendix B: Stormwater Site Planning, B-1

APPENDIX B

STORMWATER SITE PLANNING, ANALYSIS, AND DESIGN REPORT

Appendix B: Stormwater Site Planning, B-2

(This page intentionally left blank

STORMWATER SITE PLANNING, ANALYSIS

AND DESIGN REPORT

USCG OCR Homeport Initiative OPC Pier

Naval Station Newport

Newport, RI

Prepared by:

Stantec

December 12, 2025

STORMWATER SITE PLANNING, ANALYSIS AND DESIGN REPORT

USCG OCR HOMEPORT INITIATIVE OPC PIER

NAVAL STATION NEWPORT

NEWPORT, RI

Table of Contents

1.0 EXECUTIVE SUMMARY ...................................................................................................... I

1.1 PROJECT DESCRIPTION .................................................................................................... I

1.2 SITE CHARACTERISTICS ..................................................................................................... I

2.0 RHODE ISLAND STORMWATER DESIGN STANDARDS ................................................... 2.1

2.1 MINIMUM STANDARD 1: LID SITE PLANNING AND DESIGN STRATEGIES ................... 2.1

2.2 MINIMUM STANDARD 2: GROUNDWATER RECHARGE .............................................. 2.1

2.2.1 REQUIRED RECHARGE VOLUME ................................................................ 2.1

2.3 MINIMUM STANDARD 3: WATER QUALITY ................................................................... 2.2

2.3.1 Water Quality Volume (WQv) .................................................................... 2.2

2.4 MINIMUM STANDARD 4: CONVEYANCE AND NATURAL CHANNEL

PROTECTION ................................................................................................................. 2.4

2.5 MINIMUM STANDARD 5: OVERBANK FLOOD PROTECTION ...................................... 2.5

2.6 MINIMUM STANDARD 6: REDEVELOPMENT AND INFILL PROJECTS ........................... 2.6

2.6.1 Redevelopment ......................................................................................... 2.6

2.7 MINIMUM STANDARD 7: POLLUTION PREVENTION .................................................... 2.6

2.8 MINIMUM STANDARD 8: LAND USES WITH HIGHER POTENTIAL POLLUTANT

LOADS ........................................................................................................................... 2.6

2.9 MINIMUM STANDARD 9: ILLICIT DISCHARGES ............................................................ 2.6

2.10 MINIMUM STANDARD 10: CONSTRUCTION ACTIVITY SOIL EROSION,

RUNOFF, SEDIMENTATION, AND POLLUTION PREVENTION CONTROL

MEASURE REQUIREMENTS ............................................................................................ 2.7

2.11 MINIMUM STANDARD 11: STORMWATER MANAGEMENT SYSTEM OPERATION

AND MAINTENANCE..................................................................................................... 2.7

NAVAL STATION NEWPORT

1.0 EXECUTIVE SUMMARY

1.1 PROJECT DESCRIPTION

This project will provide for the demolition of the existing USN Pier 1 in Coddington Cove to clear the site for a new USCG OPC Pier with all required utilities and supporting landside laydown space to support four (4) Offshore Patrol Cutters (OPCs). The project includes the construction of a modern pier capable of long-term sustainability and support of current and future USCG missions. The new OPC pier will be 1000-ft. long by approximately 80-ft. wide and will meet or exceed the requirements of the USCG. The project will also replace the existing riprap revetment at S45S with a new bulkhead consisting of an anchored steel sheet pile wall. Elevated levels of sediment beneath the pier will likely require dredging to meet minimum OPC draft requirements.

The project is located within Site 19 at NAVSTA Newport, an area identified by the US

Environmental Protection Agency (EPA) as having contamination from historic operations at former Derecktor Shipyard. excavated soil will either be handled per land use controls (LUCs) or be managed as RA construction-derived waste.

1.2 SITE CHARACTERISTICS

NAVSTA Newport is a deepwater port with access to open seas, protected moorings, space to maneuver vessels and requires limited dredging to accommodate the OPC moorages.

Water depths in the project area are generally 30 to 40 ft. Recent (summer 2024) bathymetric surveys of the project area, however, indicated shallower areas within the footprint of the existing Pier 1. The area beneath the existing Pier 1 will be the berthing location of the north side of the new pier structure and will require dredging to meet minimum draft requirements.

Subsurface conditions from historic and recent explorations performed for the adjacent projects indicate that the landside consists of fill material with underlying glacial till with cobbles and boulders. Existing borings show thick highly weathered bedrock on top of competent rock.

Subsurface conditions on the waterside primarily consist of estuarine deposits underlain by glacial till containing cobbles and boulders. The top of rock is deeper at the waterside end of the pier with a thick highly weathered bedrock overlay.

Landside topography within the area is generally sloped east to west toward the water.

Elevations in the immediate area along the pier and bulkhead vary between elevations +8 ft. to

+11 ft. (NAVD 88).

The existing pavement in the vicinity of the pier will be demolished and disposed of in order to install the new utility infrastructure which includes electric, data, sanitary sewer, potable water and fire protection water. To further support the new pier, selective demolition of existing utilities

NAVAL STATION NEWPORT

ii will be completed and capped, as necessary. These include existing telecommunication and electrical conduit, water service piping, and gas service.

In addition, stormwater infrastructure will be removed south of the new pier, between the bulkhead and access road to provide space for an OPC laydown area. Stormwater piping to be removed includes perforated underdrains, solid storm sewer piping, as well as 12-in. diameter yard drain basins.

The bioretention basin that was planned to be constructed in conjunction with bulkhead repair project S45 at NAVSTA was not constructed to accommodate this project.

The project is located within Site 19 at NAVSTA Newport, an area identified by the US

Environmental Protection Agency (EPA) as having contamination from historic operations at former Derecktor Shipyard. excavated soil will either be handled per LUCs or be managed as RA construction-derived waste. As such, stormwater infiltration practices at the site are prohibited.

Paving and site improvements will include roadways, curbs, fencing, and signs. Site improvements will provide a minimum of 2,000 sf per cutter (8,000 sf) of paved laydown space for the four (4) OPCs. New utility service lines including electrical, water, sewer, telecommunications, and compressed air will be constructed to support pier operations.

Due to restrictions prohibiting stormwater infiltration at the project site, stormwater management will consist of traditional catch basin and storm sewer collection networks, and two (2) bioretention filter basins, discharging directly to Covington Cove via existing stormwater outfalls. Without infiltration restrictions, multiple LID techniques would typically be utilized to mitigate the adverse impacts related to stormwater runoff and water quality degradation. To offset the lost opportunities traditional LID techniques utilizing stormwater infiltration offer, alternative methods will be utilized to the greatest extent possible, to improve water quality and detain flows, as close as possible, to pre-development levels. It should be noted that existing hydrodynamic separators within the project area will be maintained and reused as part of this project. The separators will work in series with the newly proposed bioretention areas, providing an effective stormwater quality treatment train.

As noted, two (2) new bioretention filter basins will be constructed to provide stormwater quality benefits for the project area and offset the benefits lost from BMPs proposed to be complete as part of bulkhead project (S45), but not constructed. All bioretention areas will be designed with impermeable liners and underdrains. The growing media within the bioretention areas will be designed to provide both high levels of permeability and effective filtering of runoff contaminants. Stormwater runoff will be directed to the bioretention areas via sheet flow. Each basin will include perforated underdrains and overflow basins to collect excessive runoff during high intensity storm events. Accumulated sediments within the bioretention filter basins will need to be periodically removed to maintain water quality effectiveness.

The Base Flood Elevation (BFE) is at EL.+16.0 ft. (NAVD88) at the current Pier 1.

NAVAL STATION NEWPORT

iii

The stormwater system is designed to meet the requirements of the Rhode Island Stormwater

Design and Installation Standards Manual, dated March 2015 to the maximum extent practicable.

NAVAL STATION NEWPORT

NEWPORT, RI

2.1

2.0 RHODE ISLAND STORMWATER DESIGN STANDARDS

The proposed stormwater management system is designed to reduce the peak rate of runoff from pre-development conditions (as applicable), promote water quality improvements and protect groundwater quality. The stormwater management system includes bioretention filter basins, area drains and catch basins. The system is designed to meet the requirements of the Rhode Island

Stormwater Design and Installation Standards Manual (RISM) to the greatest extent practicable.

2.1 MINIMUM STANDARD 1: LID SITE PLANNING AND DESIGN

STRATEGIES

The Rhode Island Stormwater Manual requires that LID site planning and design strategies must be used to the maximum extent practicable. All development proposals must be accompanied by a completed Stormwater Management Plan Checklist and a Stormwater Management Plan to be reviewed by the approving agency to show compliance with this standard. If a redevelopment project site has 40% or more existing impervious surface coverage, Minimum

Standard 1: LID Site Planning and Design Strategies does not apply.

The proposed USCG OCR Homeport Initiative OPC Pier project is a redevelopment site with greater than 40% existing impervious surface coverage and therefore is exempt from complying with Standard 1.

2.2 MINIMUM STANDARD 2: GROUNDWATER RECHARGE

In order to comply with the Rhode Island Stormwater Design and Installation Standards Manual, stormwater must be recharged within the same sub-watershed to maintain baseflow at pre-development recharge levels to the maximum extent practicable in accordance with the requirements and exemptions described in Section 3.3.2 of the Rhode Island Stormwater Design and Installation Standards Manual.

2.2.1 REQUIRED RECHARGE VOLUME

In order to meet the state requirements, the recharge criterion (Rev,) which gives the volume of stormwater to be recharged based on the amount of impervious area on site, must be calculated.

Rev= (1”)(F)(I)/12

Where:

Rev= groundwater recharge volume (ac-ft)

NAVAL STATION NEWPORT

2.2

F= recharge factor, see Table 3-4 of the RISM

I= impervious area (acres)

Table 2.1 Recharge Factors Based on Hydrologic Soil Group (HSG), RISM

HSG Recharge Factor

(F)

A 0.60

B 0.35

C 0.25

D 0.10

As described above, the Pier site area is an Installation Restoration (IR) site, and as such, infiltration practices have been prohibited. Water Quality features are to be installed with impermeable liners to prevent infiltration. A waiver is requested to eliminate the groundwater recharge standard requirement for the Pier Landing site.

A waiver is required for Standard 2.

2.3 MINIMUM STANDARD 3: WATER QUALITY

Compliance with the Rhode Island Stormwater Design and Installation Standards Manual requires that stormwater runoff must be treated before it is discharged. The required water quality volume

(WQv) is to be calculated in accordance with Section 3.3.3 and will exclude LID credits allowed under Section 4.6 of the RISM.

2.3.1 Water Quality Volume (WQv)

A minimum WQv value of 1 inches times the impervious area is required.

WQv=(1”)(I)/12

Where:

WQv= water quality volume (in cubic-feet)

NAVAL STATION NEWPORT

NEWPORT, RI

2.3

I= impervious area (sf)

As the USCG Pier site meets the redevelopment standards (See Minimum Standard 6), the Water

Quality Volume Calculation Worksheet was utilized to determine the required impervious area required for stormwater treatment at each site, respectively. The results are as follows:

USCG OPC Pier: 0.9 acres

The water quality Volume is treated in the proposed bioretention filter basins at both sites. As noted previously, the USCG Pier site is designated as an IR site and infiltration of stormwater is prohibited. Therefore, the stormwater bioretention filter basins have been designed with an impervious liner and underdrain to collect filtered runoff at this site. Water quality benefits are provided as the stormwater runoff travels through the bioretention soil media filter bed. The areas of filter beds have been maximized to provide the most WQV possible at each site.

Stormwater from impervious areas at both sites travels via sheet flow to the proposed bioretention areas for treatment.

The required Water Quality Volumes are calculated to be:

Pier Landing: 1 inch x 0.9 acres x 1ft/12 inches= 0.075 ac-ft (3,267 CF)

Table 2.2 Required and Provided Water Quality Volume

Location Required

Water Quality

Volume (cf)

Water Quality Volume

Provided (cf)*

USCG OPC Pier 3,267 11,100

*Based on filter bed surface area provided

NAVAL STATION NEWPORT

2.4

Table 2.3 Minimum Required Filter Bed Area

WQV= 3,267 (cf)

Df= 2.0 ft

K= 1 ft/day hf= 1 ft tf= 2 days

Table 2.4 Required and Provided Filter Bed Area

Location Required Filter

Bed Area (sf)

Filter Bed Area

Provided (sf)

USCG OPC Pier 1,089 3,703

2.4 MINIMUM STANDARD 4: CONVEYANCE AND NATURAL CHANNEL

PROTECTION

The Rhode Island Stormwater Manual requires that open drainage and pipe conveyance systems are designed to provide adequate passage for flows leading to, from and through stormwater management facilities for at least the peak flow from a 10-year, 24-Hour Type III design storm event runoff volume. Protection of natural channels downstream must be supplied by providing 24-hour extended detention of the 1-yr, 24-hour Type III storm event runoff volume.

NAVAL STATION NEWPORT

NEWPORT, RI

2.5

The new storm piping and water quality treatment facilities within this project has been designed to safely manage the peak flows associated with a 10-year, 24-Hour Type III storm event. This portion of the project directly discharges to the Coddington Cove portion of Narragansett Bay, a tidal waterbody >50.0 acres in surface area. Standard 4 is waived.

2.5 MINIMUM STANDARD 5: OVERBANK FLOOD PROTECTION

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. 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.

PIER LANDING SITE

This portion of the project directly discharges to the Coddington Cove portion of Narragansett

Bay, a tidal waterbody >50.0 acres in surface area. Standard 5 is waived.

Table 2.5 Peak Flow Rates Pre- and Post-Development – USCG OPC Pier

Design

Storm

Analysis Point

‘A’

Analysis Point

‘B’

Analysis Point

‘C’

Analysis Point

‘D’

Pre

(cfs)

Post

(cfs)

Pre

(cfs)

Post

(cfs)

Pre

(cfs)

Post

(cfs)

Pre

(cfs)

Post

(cfs)

1.2-inch storm

0.494 0.467 0.777 0.691 1.35 0.990 0.69 0.69

1-year storm

1.27 1.21 2.33 2.25 3.59 2.63 1.76 1.76

10-year 2.28 2.16 4.38 3.86 6.47 4.51 3.05 3.05

100-year 4.04 3.84 7.94 6.87 11.48 11.04 5.37 5.37

NAVAL STATION NEWPORT

2.6

2.6 MINIMUM STANDARD 6: REDEVELOPMENT AND INFILL PROJECTS

According to the Rhode Island Stormwater Manual construction of new impervious area is subject to the requirements of the Rhode Island Stormwater Manual unless the site meets the definition for an infill project.

2.6.1 Redevelopment

The RISDISM defines redevelopment as any construction, alteration, or improvement that disturbs a total of 10,000 square feet or more of existing impervious area where the existing land use is commercial, industrial, governmental, recreational, or multifamily residential. If the existing impervious area comprises at least 40% of the total project area, only 50% of the existing disturbed impervious area is subject to the recharge and water quality requirements. Any new impervious area in excess of the existing disturbed impervious area requires 100% treatment.

As the pre-construction impervious area is greater than 40% of the site size, this project meets the criteria for a redevelopment for the USCG OPC Pier Site.

2.7 MINIMUM STANDARD 7: POLLUTION PREVENTION

Source control and pollution prevention measures that minimize the impact that the land use may have on the stormwater runoff quality are required by the Rhode Island Stormwater Manual. These preventative measures are outlined in a stormwater pollution prevention plan provided in the

Appendix.

2.8 MINIMUM STANDARD 8: LAND USES WITH HIGHER POTENTIAL

POLLUTANT LOADS

Stormwater discharges from land uses with higher potential pollutant loads require the use of specific source control, pollution prevention measures as well as specific approved stormwater

BMPs according to the Rhode Island Stormwater Manual. This project is not classified as a LUHPPL and therefore this standard is not applicable.

2.9 MINIMUM STANDARD 9: ILLICIT DISCHARGES

The Rhode Island Stormwater Manual prohibits all illicit discharges to stormwater management systems. This includes discharges from OWTS as well as sub-drains and French drains near OWTs that do not meet the State’s OWTS rules. The State defines a stormwater management system as the system for conveying, treating, and infiltrating stormwater on site.

NAVAL STATION NEWPORT

NEWPORT, RI

2.7

No illicit stormwater discharges have been proposed as part of this project. This standard is met.

2.10 MINIMUM STANDARD 10: CONSTRUCTION ACTIVITY SOIL

EROSION, RUNOFF, SEDIMENTATION, AND POLLUTION

PREVENTION CONTROL MEASURE REQUIREMENTS

Soil Erosion and Sedimentation Control measures must be utilized during the construction phase as well as during any land disturbing activities according to the Rhode Island Stormwater Manual.

See section 3.3.7 of RISM.

A separate Soil Erosion and Sediment Control Plan has been prepared for this project to address practices to be used during construction to control Erosion and Sediment.

2.11 MINIMUM STANDARD 11: STORMWATER MANAGEMENT SYSTEM

OPERATION AND MAINTENANCE

All stormwater management systems must provide a operation and maintenance plan, including all structural stormwater controls and conveyances. The goal of the operation and maintenance plan is not only to protect resources on-site or nearby, but also to protect resources in the region that may be affected by the activities at the project area. An Operations and Maintenance Log is included in the attachments of this document. The minimum requirements of the operation and maintenance plan are outlined in section 3.2.11 of the Rhode Island Stormwater Manual.

NAVAL STATION NEWPORT

2.8

RELEVANT PROJECT PLANS

+10.46

+10.68

10.58

X X X X X X X

X X X X X

X

XXXXXXXXXXXXXX

X

X X

X X

X

X X X

X X X

X

X X

X

E

W

T

T

E

X X X X X X X

X

E

E

E

E

MH

MH

MH

N = 162258.24' E = 379554.06'

N = 162215.20' E = 379586.23'

N = 162121.59' E = 379501.69'

N = 161832.69' E = 379557.58'

N = 161655.93' E = 379577.85'

N = 161625.63' E = 379462.80'

N = 162051.59' E = 379378.07'

N = 162128.47' E = 379355.94'

N = 162248.33' E = 379400.87'

N = 162186.77' E = 379417.66'

N = 162036.38' E = 379422.13' N = 162003.94'

E = 379437.74'

N = 162002.14' E = 379385.27'

N = 162037.05' E = 379375.22'

BEGIN C PIER 1

N = 162084.18' E = 379346.68'

Cx

C-101

SI

TE

P

LA

N (B

AS

E

BI

D)

KPG ASM PJK

PLAN

NORTH

1" = 30' 30' 0 30' 60'

GENERAL SHEET NOTES:

D

EP

AR

TM

EN

T

O F

TH

E

N

AV

Y

A

B

C

D

1 2 3 4 5

1 2 3 4 5

A

B

C

D

SCALE:

CONSTR. CONTR. NO.

SHEET

NAVFAC DRAWING NO.

N

AV

AL

F

AC

IL

IT

IE

S

EN

G

IN

EE

R

IN

G

S

YS

TE

M

S C

O M

M

AN

D

DES DRW

SY

M

D

ES

C R

IP

TI

O N

D

AT

E

AP

PR

DRAWFORM REVISION: 25 AUGUST 2020

CHK

OF

EPROJECT NO.:

PM/DM

BRANCH MANAGER

CHI…