HomeMy WebLinkAbout2026 O&M Report (Signed)
2026 STORMWATER BMP
OPERATION AND MAINTENANCE REPORT
YARMOUTH ERP FACILITY
484 WILLOW STREET, WEST YARMOUTH, MA 02673
Yarmouth Stormwater Management Permit SW2023-003
Prepared for:
EVERSOURCE ENERGY
Table of Contents Tighe&Bond
i
Section 1 Introduction and Purpose
Section 2 Certification
Section 3 Stormwater Management System
3.1 Inspections ....................................................................................3-1
3.1.1 Infiltration Basins ................................................................. 3-1
3.1.2 Deep Sump Catch Basins ...................................................... 3-1
3.1.3 Hydrodynamic Separators ..................................................... 3-2
3.1.4 Driveway, Walkway, and Parking Lot Sweeping ........................ 3-2
Appendices
A Stormwater BMP Location Map
B Shive Hattery Long Term Pollution & Operation and Maintenance Plan
C Owner’s Monthly BMP Inspection Logs
D Stormwater BMP Inspection and Maintenance logs
E Bi-Annual Street Sweeping Logs
J:\E\E5092 Eversource (L&P 2025-2028)\0010 Yarmouth Stormwater Inspections\O&M Documents\E5092-0010- Long Term Pollution Prevention
and Stormwater Management OM Plan.doc
Tighe&Bond
Long Term O&M Plan 2-1
Section 1
Introduction and Purpose
The following Stormwater BMP Operations and Maintenance (O&M) Report has been
prepared for the stormwater management system at the Eversource ERP Facility in the
Town of Yarmouth, Barnstable County, Massachusetts.
The purpose of this report is to:
• Document how the non-structural and good housekeeping practices over the last
12 months adhered to the approved O&M plan
• Document any work that was completed to properly operate and maintain the
stormwater control measures.
The completed project was designed and constructed in compliance with the
Massachusetts Department of Environmental Protection (MassDEP) Stormwater
Handbook and the Town of Yarmouth Stormwater Management Bylaw to maintain or
improve stormwater runoff quality and quantity. The Town of Yarmouth issued a
stormwater management permit (SH2023-003) for the ERP Facility project on May 22,
2023. The stormwater management system components were maintained as
recommended in the Massachusetts Stormwater Handbook and in conformance with the
following special conditions of the Yarmouth stormwater management permit.
Special Condition 2: Bi-annual sweeping of the parking lot areas shall be carried out to
ensure adequate TSS removal rates are achieved.
Special Condition 3: The owner shall provide quarterly inspections of catch basins and
retain records to identify the depth of sediment below the outlet pipe. Based on those
records, the owner shall clean the catch basins upon 50% sediment depth or once every
two years, whichever occurs first.
Tighe&Bond
Long Term O&M Plan 3-1
Section 3
Stormwater Management System
The on-site stormwater management system is comprised of catch basins,
hydrodynamic separator, and infiltration basins. In general, runoff from the proposed
work areas will be collected via catch basins and hydrodynamic separator, then directed
to three infiltration basins where stormwater runoff will infiltrate.
See the included Figure A in Appendix A for the location of the various components of
the Stormwater Management System and see Appendix B for the approved Long-Term
Pollution & Operation and Maintenance plan.
3.1 Inspections
Inspections were performed in accordance with the Massachusetts Department of
Environmental Protection (MassDEP) Stormwater Handbook and the special condition
from the issued stormwater management permit. Figure 1, provided in Appendix A,
identifies the location of each BMP that was inspected and maintained as described in
this Section. All inspections are logged using the Inspection Forms provided in Section 5
or logged in an equivalent Inspection Form.
The following stormwater management system features were evaluated during each
inspection:
3.1.1 Infiltration Basins
Inspection Frequency: Monthly
Special Inspection Event(s): Rainfall greater than 3 inches
Surface infiltration basins were inspected monthly for standing water and biannually for
settling, cracking, erosion, leakage, vegetative cover condition, and sediment
accumulation. Additionally, infiltration basins were observed to identify depths of
sediment and occurrence of debris that would impact functionality. The outlet control
structure, if applicable, was observed for signs of clogging during storm events and
erosion. Inspections of the basin occur monthly, especially the sand bottom, which
should remain clear of any trash, sediment, or debris. Any trash, sediment, or debris
encountered was removed. The side slopes were mowed a minimum of twice annually.
Heavy equipment was never operated within infiltration basins.
3.1.2 Deep Sump Catch Basins
Inspection Frequency: Monthly
Special Inspection Event(s): Rainfall greater than or equal to the 1-year 24-hour
storm event.
Deep sump catch basins were inspected once per month. The visual inspection did
ascertain that the catch basin is functioning properly (i.e., no blockages or obstructions
to the outlet and/or hood) and measured the amount of solid materials that have
accumulated in the sump. This was done with a calibrated dipstick, tape measure, or
other measuring instrument so that the depth of deposition in the sump can be tracked.
Section 3 Maintenance Contacts Tighe&Bond
D0225-44 Long Term O&M Plan 3-2
Inspections were completed visually from the ground level. Deep sump catch basins
were cleaned upon 50% sediment depth or once every two years, whichever occurred
first. Cleanings were also conducted at the end of the foliage and snow-removal
seasons. Clamshell buckets can be used to remove sediment. However, vacuum trucks
will remove more trapped sediment, are more expedient, and are less likely to damage
hoods on outlet pipes. Disposal of sediment removed from catch basins was completed
in accordance with local, state, and federal requirements.
3.1.3 Hydrodynamic Separators
Inspection Frequency: Quarterly
Special Inspection Event(s): Rainfall greater than or equal to the 1-year 24-hour
storm event.
Hydrodynamic separators were inspected monthly and after significant rain events. They
were observed for clogging, trash accumulation, and signs of damage or mechanical
failure. Any debris was immediately removed, and any organics lodged in the inverts
were rinsed out as necessary.
3.1.4 Driveway, Walkway, and Parking Lot Sweeping
Inspection Frequency: Bi-annually
Special Inspection Event(s): Spring Snow Melt, Autumn Leaf Fall
All pavement surfaces were inspected biannually for deterioration or spalling.
Additionally, the pavement surface was regularly monitored to make sure it drains
properly after storms. Cleanings were conducted on a quarterly basis to prevent
clogging. For best management practices, high -efficiency vacuum sweeping machines
should be used to clean and maintain the surface.
\\Tighebond.com\data\Data\Projects\E\E5092 Eversource (L&P 2025-2028)\0010 Yarmouth Stormwater Inspections\O&M Documents\E5092-0010-
Long Term Pollution Prevention and Stormwater Management OM Plan.doc
APPENDIX A
STORMWATER BMP LOCATION MAP
NSTORMWATER BMP LOCATION MAPYARMOUTH STORMWATER INSPECTIONSYARMOUTH, MASSACHUSETTSSCALE:DATE:FIGURE:JULY 202511" = 30'INFILTRATION BASIN #1HYDRODYNAMICSEPARATORCATCH BASINCATCH BASINSINFILTRATIONBASIN #3INFILTRATION BASIN #2CATCH BASINSHYDRODYNAMICSEPARATORHYDRODYNAMIC SEPARATORHYDRODYNAMIC SEPARATORCATCH BASINHYDRODYNAMICSEPARATOR
APPENDIX B
SHIVE HATTERY LONG TERM POLLUTION
& OPERATION AND MAINTENANCE PLAN
WILLOW STREET
PROPERTY LINE, TYP.PARKING SETBACKLINE, TYP.PROPERTY LINE, TYP.200' BUFFER FORRIVER, TYP.(FIELD LOCATED)PROPERTY LINE, TYP.ST CB A-2 (48" CATCH BASINSEE DETAILS 6 & 7/C501)ST CB B-3 (48" CATCH BASIN)ST MH C-2 (HYDRODYNAMIC SEPERATORSEE 1/C503OPEN GRATE)ST FES C-1 (18 '' RCP FES)ST FES B-1 (18 '' RCP FES)ST MH B-2 (HYDRODYNAMIC SEPARATORSEE 1/C503OPEN GRATE)ST FES B-4 (12 '' RCP FES)OVERFLOW FROM BASIN #2ENTERS THIS FESST CB E-3 (3' X 3' RECTANGUALR INTAKEW/CONCAVE 2' X 2' INLET FRAME & GRATE)ST FES A-5 (12 '' RCP FES)OVERFLOW FROM BASIN #3ENTERS THIS FESST MH A-1 (HYDRODYNAMIC SEPARATORSEE 1/C503OPEN GRATE)ST CB A-4 (48" CATCH BASIN)ST FES A-1 (18 '' RCP FES)ST CB E-2 (3' X 3' RECTANGULAR INTAKEW/2' X 2' INLET FRAME & GRATE)ST FES E-1 (15 '' RCP FES)ST FES A-3 (12 '' RCP FES)ST MH D-1 (HYDRODYNAMIC SEPARATORSEE 2/C50324" X 24" FRAME AND GRATE)ST FES D-1 (15 '' RCP FES)OVERFLOW FROM BASIN #2ENTERS THIS FESST P-C-1 83 LF18" RCP CLASS IV @ 0.31%ST P-A-2 167 LF15" RCP CLASS IV @ 0.25%ST P-B-2 165 LF15" RCP CLASS IV @ 0.35%ST P-B-1 83 LF18" RCP CLASS IV @ 0.26%ST P-B-3 156 LF12" RCP CLASS IV @ 0.73%ST P-E-3 159 LF8 '' PVC @ 0.10%ST P-C-2 173 LF15" RCP CLASS IV @ 0.30%ST P-A-5 330 LF12" RCP CLASS IV @ 0.32%ST P-A-4 35 LF15" RCP CLASS IV @ 0.50%ST P-A-1 83 LF18" RCP CLASS IV @ 0.31%ST P-E-2 159 LF8 '' PVC @ 0.10%ST P-E-1-B 35 LF15" RCP CLASS IV @ 0.25%ST P-A-3 149 LF12" RCP CLASS IV @ 0.87%ST P-D-1 10 LF15 '' RCP @ 0.68%RIPRAP, TYP.ST FES G-1 (12 '' RCP FES)ST P-G-1 11 LF12 '' RCP @ 0.50%ST MH G-2 (HYDRODYNAMIC SEPARATORSEE 2/C503OPEN GRATE)ST MH F-2 (HYDRODYNAMIC SEPARATORSEE 2/C503OPEN GRATE)ST P-F-1 5 LF15 '' RCP @ 1.45%ST FES F-1 (15 '' RCP FES)ST CB C-3 (48" CATCH BASIN)INFILTRATIONBASIN #1INFILTRATIONBASIN #3INFILTRATIONBASIN #2BASIN #1OVERFLOWSPILLWAY33
33
293031323129 30 31 32
29 30 31
31 30 29 34333335343031323330333334 33 32 31313233
33
33333332323131
3
0
31
32 ST P-E-1-A 288 LF15" RCP CLASS IV @ 0.25%ST MH E-4 (HYDRODYNAMIC SEPARATORSEE 5/C50324" ROUND SOLID COVER)DRAWN BY
APPROVED BY
ISSUED FOR
ISSUE DATE
FIELD BOOK:
PROJECT NUMBER
Printed:EX. 1OPERATION &
MAINTENANCE
PLAN
EAW
IJH
PERMIT
05/01/2023
3172201210
---
YARMOUTH ERP
EVERSOURCE ENERGY, INC.
484 WILLOW STREET, YARMOUTH, MA 02673
P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Operation & Maintenance Exhibit.dwg5/1/2023 3:13:25 PM APRELIMINARY
- NOT FOR
CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320
CHICAGO, ILLINOIS 60654
312.324.5500 | SHIVE-HATTERY.COM
APPENDIX C
OWNER’S MONTHLY BMP INSPECTION LOGS
APPENDIX D
STORMWATER BMP
INSPECTION & MAINTENANCE LOGS
APPENDIX E
BI-ANNUAL STREET SWEEPING LOGS
To:
P.A. Landers, Inc.
P.O. Box 217
351 Winter Strect
Hanover, Massachusetts 02339
PHONE: (781) 826-8818 FAX: (781) 829-8934
EVERSOURCE ENERGY SERVICE CO
PO BOX 5017
HARTFORD, CT 06102-5017
Job Location:
Invoice ID: T47993
Invoice Date: 05/29/2026
Requisition ID: 8
Customer ID: EVE25
P.O. Number 13411592
2026 Equipment Rental-NON RATE
YARMOUTH
484 WILLOW ST
Ship Via: BEST WAY
Unit of
Item Description Units Measure Unit Price Amount
1 TRAILER MOVE ELGIN SWEEPER 5/11/26 4.00 HR 160.00 640.00
2 TRAILER MOVE SKIDSTEER W-P/U BROOM 4.00 HR 160.00 640.00
3 ELGIN SWEEPER 9.00 HR 250.00 2,250.00
4 SKIDSTEER W-P/U BROOM 9.00 HR 185.00 1,665.00
5 6 WHLR SERVICE 9.00 HR 105.00 945.00
6 5% FUEL SURCHARGE 1.00 AMT 307.00 307.00
7 SUPERVISOR W/TRUCK 9.00 HR 135.00 1,215.00
8 LABORER W/BACKPACK BLOWER 9.00 HR 125.00 1,125.00
9 STREET SWEEPER 5/12/26 9.00 HR 250.00 2,250.00
10 SKIDSTEER W-P/U BROOM 9.00 HR 185.00 1.665.00
11 6 WHLR SERVICE 9.00 HR 105.00 945.00
12 5% FUEL SURCHARGE 1.00 AMT 243.00 243.00
13 SUPERVISOR W/TRUCK 9.00 HR 135.00 1,215.00
14 LABORER W/BACKPACK BLOWER 9.00 HR 125.00 1,125.00
15 ELGIN SWEEPER 5/13/26 9.50 HR 250.00 2,375.00
16 SKIDSTEER W-P/U BROOM 9.50 HR 185.00 1,757.50
17 6 WHLR SERVICE 9.50 HR 105.00 997.50
18 5% FUEL SURCHARGE 1.00 AMT 256.50 256.50
19 SUPERVISOR W/TRUCK 9.50 HR 135.00 1,282.50
20 LABORER W/BACKPACK BLOWER 9.50 HR 125.00 1,187.50
Amount Billed
Total Tax
$24,086.50
Retainage Held
DATE DUE: 06/28/2026 Amount Due $24,086.50