HomeMy WebLinkAbout2025 OM Report (Signed)
2025 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 2-1
Section 2
Certification
Eversource Energy is the owner and "Responsible Party” that is required to maintain and
service the stormwater management system at 484 Willow Street in Yarmouth
Massachusetts. As per the conditions of the Yarmouth Stormwater Management Permit,
the Responsible Party has maintained operations and maintenance logs of inspections,
repairs, maintenance and/or replacement of the stormwater management system or any
part thereof, and disposal of accumulated sediment and waste in accordance with state
and federal regulations.
The undersigned certifies that the stormwater BMPs were inspected, maintained and
repaired in accordance with the conditions specified in the Town of Yarmouth
Stormwater Management Permit (SW2023-003).
Property Owner/Maintenance Contact:
Jason St. Martin
Eversource Energy, Inc.
247 Station Drive
Westwood, MA 02090
Signature, date:
10-30-25
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
N
STORMWATER BMP LOCATION MAP
YARMOUTH STORMWATER INSPECTIONS
YARMOUTH, MASSACHUSETTS
SCALE:
DATE:
FIGURE:
JULY 2025
1
1" = 30'
INFILTRATION BASIN #1
HYDRODYNAMIC
SEPARATOR
CATCH BASIN
CATCH BASINS
INFILTRATION
BASIN #3
INFILTRATION BASIN #2
CATCH BASINS
HYDRODYNAMIC
SEPARATOR
HYDRODYNAMIC
SEPARATOR
HYDRODYNAMIC SEPARATOR
CATCH BASIN
HYDRODYNAMIC
SEPARATOR
APPENDIX B
SHIVE HATTERY LONG TERM POLLUTION
& OPERATION AND MAINTENANCE PLAN
WIL
L
O
W
S
T
R
E
E
T
PROPERTY LINE, TYP.
PARKING SETBACK
LINE, TYP.
PROPERTY LINE, TYP.
200' BUFFER FOR
RIVER, TYP.
(FIELD LOCATED)
PROPERTY LINE, TYP.
ST CB A-2 (48" CATCH BASIN
SEE DETAILS 6 & 7/C501)
ST CB B-3 (48" CATCH BASIN)
ST MH C-2 (HYDRODYNAMIC SEPERATOR
SEE 1/C503
OPEN GRATE)
ST FES C-1 (18 '' RCP FES)
ST FES B-1 (18 '' RCP FES)
ST MH B-2 (HYDRODYNAMIC SEPARATOR
SEE 1/C503
OPEN GRATE)
ST FES B-4 (12 '' RCP FES)
OVERFLOW FROM BASIN #2
ENTERS THIS FES
ST CB E-3 (3' X 3' RECTANGUALR INTAKE
W/CONCAVE 2' X 2' INLET FRAME & GRATE)
ST FES A-5 (12 '' RCP FES)
OVERFLOW FROM BASIN #3
ENTERS THIS FES
ST MH A-1 (HYDRODYNAMIC SEPARATOR
SEE 1/C503
OPEN GRATE)
ST CB A-4 (48" CATCH BASIN)
ST FES A-1 (18 '' RCP FES)
ST CB E-2 (3' X 3' RECTANGULAR INTAKE
W/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 SEPARATOR
SEE 2/C503
24" X 24" FRAME AND GRATE)
ST FES D-1 (15 '' RCP FES)
OVERFLOW FROM BASIN #2
ENTERS THIS FES
ST P-C-1 83 LF
18" RCP CLASS IV @ 0.31%
ST
P
-
A
-
2
1
6
7
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F
15"
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ST P-E-3 159 LF
8 '' PVC @ 0.10%
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ST P-A-5 330 LF
12" RCP CLASS IV @ 0.32%
ST P-A-4 35 LF
15" RCP CLASS IV @ 0.50%ST
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8
3
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F
18
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ST P-E-2 159 LF
8 '' PVC @ 0.10%
ST
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ST
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1
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12
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@
0
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8
7
%
ST P-D-1 10 LF
15 '' RCP @ 0.68%
RIPRAP, TYP.
ST FES G-1 (12 '' RCP FES)
ST P-G-1 11 LF
12 '' RCP @ 0.50%
ST MH G-2 (HYDRODYNAMIC SEPARATOR
SEE 2/C503
OPEN GRATE)
ST MH F-2 (HYDRODYNAMIC SEPARATOR
SEE 2/C503
OPEN GRATE)
ST P-F-1 5 LF
15 '' RCP @ 1.45%
ST FES F-1 (15 '' RCP FES)
ST CB C-3 (48" CATCH BASIN)
INFILTRATION
BASIN #1
INFILTRATION
BASIN #3
INFILTRATION
BASIN #2
BASIN #1
OVERFLOW
SPILLWAY
3
3
33
29
30
31
32
31
29
30
31
32
29
30
31
31
30
29
34
33
33
35
34
30 31 32 33
30
3
3
33
34
33
32
3131
32
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33
3
3
33
32
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31
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31
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ST MH E-4 (HYDRODYNAMIC SEPARATOR
SEE 5/C503
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APPENDIX C
OWNER’S MONTHLY BMP INSPECTION LOGS
APPENDIX D
STORMWATER BMP
INSPECTION & MAINTENANCE LOGS
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Oil/IVater Separator Inspection Form
EiIVIBOilMEilTAt SERYICES'
Clean Harbors Environmental Services, lnc
609 Pleasalt Street
Weymouth, MA 02189
SEPERATOR Commcnts:
In dccorddnce $,ith lhe Massachusetts Stqte Plumping Code (248 CMR 2.00) and the Massachusetts Waler
Resourcet Authority Regulations (j60 CMR 10.00), oil/walet separators and associatedjloor drains syslems are
requircd lo be mainlained in goodworking order.
Thefollowing Iisting represents the maintenance ond inspection tashs performed.
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Depth of Accumulated Oil 5 [{"r
Deplh of Accumulated Scdiments \ tt
Manilest Number/Disposar volurne. 0lD*/9 / 33 - lO90 LtA
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Date of Cleaning/Inspection
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Clean Harbors Environmental Services, lnc
609 Plcasart Strcct
weymouth, MA 02189
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In accordakce wilh ,he Massachusats State Plumping Code Q48 CMR 2.00) atd lhe Ma$qchu;etts Water
Rxourca Authority Regulations (j60 CMR 10.00), oillwarer separators and associatedfloor drains systems qre
required to be maintained in good working odet
Thc following listing represents the maintenqnce oad inspeclion tasks performed.
Depth of Accumulrtcd oir J|et-n( ,i"
SEPERATOR Comments:
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FLOOR D NS Com cnts:
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"People and Technologt Creating a Betler Enyironment"
Drte of clcanitrg/lu on ro@,' &&f
Depth of Accumulated S€dimerts
Manifesr Nu m ber/D ispos t v oilutr,e O A 6 l Ll
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Oil/Water Separator Inspection Form
ln accordance with the Massachwau Stqte Plumping Code Q48 CMR 2.00) a the Massachusetu Water
Resouces Authority Regulations (360 CMR 10.00), oillwoter seporators and ossociatedJloor dtains systems arc
required to be maintained in good vorking order.
The tollowing listing represents the maintenance otd inspection tasl,s performed.
Dete of CleaDing/Itrspec ation AS
Depth of AccuDulated Oil
Depth of Accumulated Sediments li'&)v*n+-
Manifest Number/Disp osal Volume t3 IAD Lh'
SEPERATOR Comments:
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FLOOR DRAINS Commcnls:
tl*/uhspector _
Cleatr Harbors Environmental Scrvices, Inc.
609 Plearant Strect
Wcymouth, MA 02189
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"People and Technologt Creating a Better Enyironment"
EilVtB0ilIIE TAL SEBVICES'
Cl€an Ha6ors Enviromental Serviccs, lnc
609 Plc6art Sbcct
Wcymouth, MA 02189
781.801.4136
Fax 781.331.8264
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Depth of Accumulered sedir"nlr!p,1-1.r,L V*u,.rn \la" +'t At'SeJrwte*f
Manifest Numbcr/Disposal Volu *" O&Dt t ooo Lbr
Cgil. BnsinS
Comments:
t\tr Crr{l Bmtns h*o( t'n,i',u,n^r"1 J[en^ 4 \JMi-e W*r*/r" Jn a"J.
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FLOOR DRAINS Comments:
9 /,t r Clnspecaor -
"People and Technologt Creating a Better Envbonmenl "
ln accordonce with the Massachusetts State Plumping Code (248 CMR 2.00) a the Massachlts€tts Water
Resoutces Aythoity Regulations (j60 CMR 10.00), oillvder seryators and ossociatedJloor drains systems qe
reqaired lo be maintained in good working oder.
The lollowing listing represents the maintenqnce and inspection tasks petformed.
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APPENDIX E
BI-ANNUAL STREET SWEEPING LOGS