HomeMy WebLinkAbout2024/11/13 - Stormwater Management Report - - IS),,,,IIC,,,, III''\'III ,,, 1IC IIE;;;;;;III''\ MANAGEMEN,,,,IIC,,,, s 's,,,,r,IIE;;;;;;M 0 I1!!!IIE;;;;;;III''\A IC 10 I IIN D M A I IC 1C IE;;;;;;II All OE;;;;;; IMAIIN LJAIIL......
Lecture Hall at Merrimack
Colle 9 e
tt01A), 1 i 1111111111111
�l111:3 d < SIIIIIIL�r-eelllt
0 � q�q (f�
A
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Merrimack College
315 Turnpike Street
North Andover, MA 01845
978.837.5000
BY
ow
260 Arsenal Street#2
PO Box 9151
Watertown, MA 02472
617.924.1770
September 12, 2024
Revised November 13, 2024
Operations i I Lecture Hall at Merrimack , MA
Table of Contents
ProjectInformation...............................................................................................................iii
SectionA: Source Control ..................................................................................................A-1
Section B: Spill Prevention.................................................................................................B-1
B.1 Initial Notification....................................................................................................................B-1
B.2 Further Notification.................................................................................................................B-1
B.3 Assessment— Initial Containment.....................................................................................B-4
SectionC: Snow Management...........................................................................................C-1
Section D: Maintenance of Stormwater Management Systems.................................... D-1
D.1 Pavement Systems..................................................................................................................D-1
D.1.1 Standard Asphalt Pavement...............................................................................D-1
D.2 Structural Stormwater Management Devices..............................................................D-1
D.2.1 Catch Basins/Area Drains..................................................................................D-1
D.2.2 Structural Water Quality Devices.....................................................................D-2
D.2.3 Subsurface Infiltration Basins.............................................................................D-2
D.2.4 Roof Drain Leader..................................................................................................D-3
D.3 Vegetated Stormwater Management Devices............................................................D-3
D.3.1 Vegetated Areas Maintenance..........................................................................D-3
Section E: Operations and Maintenance Plan Summary.................................................E-1
E.1 Routine Maintenance Checklists........................................................................................E-1
E.2 Reporting and Documentation..........................................................................................E-1
E.3 Safety Measures.......................................................................................................................E-1
EAMaintenance Budget..............................................................................................................E-1
E.5 Construction Practices Maintenance/ Evaluation Checklist....................................E-2
E.6 Long-term Maintenance/Evaluation Checklist.............................................................E-3
E.7 Maintenance Checklists and Device Location Maps..................................................E-4
Section F: Product Literature.............................................................................................F-1
Section G: Maintenance Agreement..................................................................................G-1
i Table of Contents
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
ii Table of Contents
Operationsi I Lecture Hall at Merrimack , MA
Proj'oect Information
Site
Lecture Hall at Merrimack College
315 Turnpike Street
North Andover, MA 01845
Owner
Merrimack College
315 Turnpike Street
North Andover, MA 01845
978-837-5000
Facility Manager
John Waters
Merrimack College
315 Turnpike Street
North Andover, MA 01845
978-895-3252
Site Contact
Name:
Telephone:
Cell phone:
Email:
iii Project Information
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
iv Project Information
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
Operations and MaintenanceILecture Hall at Merrimacko r, MA
01
do
Source Control
A comprehensive source control program will be implemented at the Lecture Hall at
Merrimack College, which includes the following components:
Regular pavement sweeping
> Catch basin cleaning
> Clearing litter from the parking area, islands, and perimeter landscape areas
> Enclosure and regular maintenance of all dumpsters
> Spill Prevention training
A-1 Source Control
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
A-2 Source Control
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
Operationsi c ILecture Hall at MerrimackCollege, r, MA
do
B Spill Prevention
Spill prevention equipment and training will be provided by Merrimack College.
�n iltIIIII a�� N ' IIIII' IIIII ' IIIII o�n
In the event of a spill the facility and/or construction manager or supervisor will be notified
immediately.
Facility Manager (name): John Waters— Merrimack College
Facility Manager (phone): 978-895-3252
Construction Manager (name) : Lance Bennett— ProCon Inc
Construction Manager (phone): 603-518-2244
The supervisor will first contact the Fire Department and then notify the Police Department,
the Public Health Commission and the Conservation Commission. The Fire Department is
ultimately responsible for matters of public health and safety and should be notified
immediately.
0u ' Ir N ot ilfil c at ii o�n
Based on the assessment from the Fire Chief, additional notification to a cleanup contractor
may be made. The STATE Department of Environmental Protection (DEP) and the EPA may
be notified depending upon the nature and severity of the spill. The Fire Chief will be
responsible for determining the level of cleanup and notification required. The attached list
of emergency phone numbers shall be posted in the main construction/facility office and
readily accessible to all employees.A hazardous waste spill report shall be completed as
necessary using the attached form.
B-1 Spill Prevention
Operations i to ILecture Hall at Merrimacke o , MA
Emergency Notification Phone Numbers
1. FACILITY MANAGER
Name: John Waters Phone: 978-895-3252
Beeper/Cell:
Home Phone:
Alternate Contact: Phone:
Beeper/Cell:
Home Phone:
2. FIRE & POLICE DEPARTMENT Emergency: 911
3. CLEANUP CONTRACTOR
Address: Phone:
4. MASSACHUSETTS DEPARTMENT OF ENVIRONMENTAL Emergency: 1-(888) 304-1133
PROTECTION (DEP)
5. NATIONAL RESPONSE CENTER Phone: (800) 424-8802
Alternate: U.S. Environmental Protection Agency Emergency:
Business:
6. NORTH AN DOVER HEALTH DEPARTMENT Phone: (978) 688-9540
North Andover Conservation Commission: Phone: (978) 688-9530
B-2 Spill Prevention
Operationsi I Lecture Hall at Merrimack , MA
Hazardous Waste & Oil Spill Report
Date: Time: AM/PM
Exact location
(Transformer#):
Type of equipment: Make: Size:
S/N: Weather Conditions:
On or near water? ❑ Yes If es, name of body of water:
❑ No y y
Type of chemical/oil spilled:
Amount of chemical/oil spilled:
Cause of spill:
Measures taken to
contain or clean up spill:ill:
Amount of chemical/oil recovered: Method:
Material collected as a result of cleanup:
drums containing
drums containing
drums containing
Location and method of debris disposal:
Name and address of any person, firm,
or corporation suffering charges:P 9 9
Procedures, method,and precautions
instituted to prevent a similar occurrence
from recurring:
Spill reported by General Office by: Time: AM/ PM
Spill reported to DEP/National Response Center b
P P P Y
DEP Date: Time: AM/ PM InsP ector:
N RC Date: Ti me: AM/ PM I nsP ector:
Additional comments:
6-3 Spill Prevention
Operations i I Lecture Halli o Andover, MA
��33 Asses °°° .°°°°°°°°- ��hniltiI4 iinmen't
The supervisor or manager will assess the incident and initiate containment control measures
with the appropriate spill containment equipment included in the spill kit kept on-site.A list
of recommended spill equipment to be kept on site is included on the following page.
Fire/ Police Department: 911
North Andover Health Department (978) 688-9540
North Andover Conservation (978) 688-9530
Commission:
Emergency Response Equipment
The following equipment and materials shall be maintained at all times and stored in a
secure area for long-term emergency response need.
Supplies Quantity Recommended Suppliers
Sorbent Pillows/"Pigs" 2 ,Iht-tpj .ne i xor
Item#KIT276 —mobile container with two pigs
Sorbent Boom/Sock 25 feet forestir su Iliers.cor�n
.III.. a
Sorbent Pads 50
Lite-Dri® Absorbent 5 pounds
Shovel 1 Item#33934—Shovel (or equivalent)
Pry Bar 1 Item#43210—Manhole cover pick(or equivalent)
Goggles 1 pair Item#23334—Goggles(or equivalent)
Gloves—Heavy 1 pair Item#90926—Gloves(or equivalent)
B-4 Spill Prevention
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
Operationsi c ILecture Hall at Merrimackr, MA
do
C Snow Management
Snow storage areas are shown on the attached Snow Storage Area Map in section E.5
Maintenance Checklists and Device Location Maps.
Snow storage areas will be managed to prevent blockage of storm drain catch basins and
stormwater drainage swales. Snow combined with sand and debris may block a storm
drainage system, diminishing the infiltration capacity of the system and causing localized
flooding.
> Sand and debris deposited on vegetated or paved areas shall be cleared from the site
and properly disposed of at the end of the snow season, no later than May 15.
> Snow shall not be dumped into any waterbody, pond, or wetland resource area.
C-1 Snow Management
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
C-2 Snow Management
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
Operations i ILecture Hall at MerrimackAndover, MA
do
D Maintenance of Stormwater Management
S oft
ystems
��'3.1 ��,3, avement Systems
Standard aIr sptial It a �II III°
Sweep or vacuum standard asphalt pavement areas at least four times per year with a
rotary brush sweeper, and properly dispose of removed material.
> Recommended sweeping schedule:
o Oct/Nov
o Feb/Mar
o Apr/May
o Aug/Sep
> More frequent sweeping of paved surfaces will result in less accumulation in catch basins,
less cleaning of subsurface structures, and less disposal costs.
> Check loading docks and dumpster areas frequently for spillage and/or pavement
staining and clean as necessary.
��'D.2 Structu4�� Stormwater Management )evices
.1 Ill II s / Area II ' Ili II s
The proper removal of sediments and associated pollutants and trash occurs only when
catch basin inlets and sumps are cleaned out regularly. The more frequent the cleaning, the
less likely sediments will be re-suspended and subsequently discharged. In addition,
frequent cleaning also results in more volume available for future deposition and enhances
the overall performance. As noted in the pavement Operation and Maintenance (O&M)
section, more frequent sweeping of paved surfaces will result in less accumulation in catch
basins, less cleaning of subsurface structures, and less disposal costs.
There is one (1) catch basin and four (4) area drains at the Lecture Hall at Merrimack College.
The catch basin is constructed with a sump (minimum 4 feet) and hooded outlets to trap
D-1 Maintenance of Stormwater Management Systems
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
debris, sediments, and floating contaminants. The area drains are constructed with sumps
(minimum 2 feet). Disposal of all sediments must be in accordance with applicable local,
state, and federal guidelines. Catch basin and area drains locations are included in the
Stormwater BMP Location Map included in Section E.5 Maintenance Checklists and Device
Location Maps.
Inspections and Cleaning
> All catch basins shall be inspected at least four times per year and cleaned a minimum of
at least once per year.
> Sediment (if more than six inches deep) and/or floatable pollutants shall be pumped from
the basin and disposed of at an approved offsite facility in accordance with all applicable
regulations.
> Any structural damage or other indication of malfunction will be reported to the site
manager and repaired as necessary
> During colder periods, the catch basin grates must be kept free of snow and ice.
> During warmer periods, the catch basin grates must be kept free of leaves, litter, sand,
and debris.
2.2 Structural Walter l Ill" Devi ices
The stormwater drainage system has one (1) structural water quality devices.These are
Contech CDS1515 Water Quality Units,which efficiently remove sediment and hydrocarbons
from stormwater runoff. A map showing the locations is included in Maintenance Checklists
and Device Location Maps.
> Refer to CDS Operation, Design, Performance and Maintenance Guide included in Section
F.
> Inspect devices monthly for the first three months after construction.
> After initial three-month period, all water quality units are to be inspected at least four
times per year and cleaned a minimum of at least once per year (when sediment reaches
8" in depth).
> Follow manufacturer instructions and contact manufacturer if system is malfunctioning.
. 3Subsurface I I'
The subsurface infiltration/detention basins are used to detain and infiltrate roadway and
rooftop runoff. There is one (1) subsurface infiltration basin at the Lecture Hall at Merrimack
College.A map of the infiltration basin locations is included in Section E.5 Maintenance
Checklists and Device Location Maps.
D-2 Maintenance of Stormwater Management Systems
Operations i I Lecture Hall at MerrimackAndover, MA
Inspections and Cleaning
The subsurface infiltration systems will be inspected at least twice each year by removing
the manhole/access port covers and determining the thickness of sediment that has
accumulated in the sediment removal row.
> If sediment is more than six inches deep, it must be suspended via flushing with clean
water and removed using a vactor truck.
> Manufacturer's specifications and instructions for cleaning the sediment removal row are
provided as an attachment to this section.
> Emergency overflow pipes will be examined at least once each year and verified that no
blockage has occurred.
> System will be observed after rainfalls to see if it is properly draining.
2 . II Ill n Leader
II
Roof runoff from the Proposed Building at the Lecture Hall at Merrimack College are
directed to the subsurface infiltration units.
> Perform routine roof inspections quarterly.
> Keep roofs clean and free of debris.
Keep roof drainage systems clear.
> Keep roof access limited to authorized personnel.
> Clean inlets twice per year or as necessary.
��'13 Vegetated Stormwater Management ��',',)eviices
Vegetated a t II as Ill III'tenance
I
Although not a structural component of the drainage system,the maintenance of vegetated
areas may affect the functioning of the stormwater management system.This includes the
health/density of vegetative cover and activities such as the application and disposal of lawn
and garden care products, disposal of leaves and yard trimmings and proper aeration of soils.
> Inspect planted areas on a semi-annual basis and remove any litter.
> Maintain planted areas adjacent to pavement to prevent soil washout.
> Immediately clean any soil deposited on pavement.
> Re-seed bare areas; install appropriate erosion control measures when native soil is
exposed or erosion channels are forming.
> Plant alternative mixture of grass species in the event of unsuccessful establishment.
> The grass vegetation should be cut to a height between three and four inches.
> Pesticide/Herbicide Usage— No pesticides are to be used unless a single spot treatment
is required for a specific control application.
D-3 Maintenance of Stormwater Management Systems
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
> Fertilizer usage should be avoided. If deemed necessary, slow release fertilizer should be
used. Fertilizer may be used to begin the establishment of vegetation in bare or damaged
areas, but should not be applied on a regular basis unless necessary.
> Annual application of compost amendments and aeration are recommended.
D-4 Maintenance of Stormwater Management Systems
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
D-5 Maintenance of Stormwater Management Systems
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
Operationsi ILecture Hall at Merrimack , MA
do
E Operations and Maintenance Plan Summary
This Operation and Maintenance Plan has been prepared in accordance with the Stormwater
Management Policy developed by the DEP and CZM and local regulations. It specifies
operational practices and drainage system maintenance requirements for the Lecture Hall at
Merrimack College. Requirements should be adjusted by the site manager as necessary to
ensure successful functioning of system components.
���ZoutilneMailatena ilsts
Routine required maintenance is described in Sections A— D. The following checklists are to
be used by the property manager to implement and document the required maintenance
and inspection tasks.
Repartii In'ta,t'III'IIo�n
The site supervisor shall be responsible for ensuring that the scheduled tasks as described in
this plan are appropriately completed and recorded in the Maintenance Log. Accurate
records of all inspections, routine maintenance and repairs shall be documented and these
records shall be available for inspection by members of the North Andover Conservation
Commission, or their designated agent, upon request.
The Maintenance Log shall:
> Document the completion of required maintenance tasks.
> Identify the person responsible for the completion of tasks.
> Identify any outstanding problems, malfunctions or inconsistencies identified during the
course of routine maintenance.
> Document specific repairs or replacements.
Safety Measures
All maintenance work is to be completed in accordance with Merrimack College safety
requirements, as well as all local, state, OSHA and other federal safety requirements.
Maildn'tenance ���3udge t
Merrimack College estimates an approximate annual maintenance budget of$25,000 for
maintenance of stormwater BMPs, in addition to the campus-wide in house maintenance
performed by their Facilities Department.
E-1 Operations and Maintenance Plan Summary
Operations and MaintenanceI Lecture Hall at Merrimacko v , MA
Canstructil ° r IIIII °°° Mailn"' °°° °°° Chedk���ilst
The Lecture Hall at Merrimack College- North Andover, MA
Cleaning or
Best Repair Needed Date of
Management Inspection Date Inspector Minimum Maintenance ❑Yes/No Cleaning Performed
Practice Frequency Inspected Initials and Key Items to Check (List Items) or Repair by:
Hay Bales/ Weekly and Sediment build up, broken
Silt Fencing after any bales or stakes
rainfall
Gravel Weekly and Filled voids,runoff/sediments
Construction after any into street
Entrance rainfall
Catch Basin Weekly and Clogged or sediment build-
Protection after any up at surface or in basin
rainfall
Diversion Weekly and Maintained,moved as
Channels after any necessary to correct locations,
rainfall Check for erosion or breakout
Temporary Weekly and Cracking,erosion, breakout,
Sedimentation after any sediment buildup,
Basins rainfall contaminants
Stormwater Control Manager:
E-2 Operations and Maintenance Plan Summary
Operations and Maintenancel Lecture Hall at MerrimackCollege, ov , MA
ang°°°° IIIII IIIII Che&V�hilst
The Lecture Hall at Merrimack College- North Andover, MA
Minimum Cleaning or Date of
Best Maintenance Repair Cleaning
Management and Key Items Inspection Date Inspector Cleaning Needed or Performed
Practice to Check Frequency Inspected Initials Frequency ❑Yes/No Repair by:
Street Vacuum sweeper 4X per year 4X per year*
Sweeping minimum
Deep Sump Remove sediment 1X 4X per year 1X per year or
and Hooded per year or if>6 as necessary
Catch basins inches
Subsurface Remove sediment 1X 2X per year 1X per year
Infiltration per year or if>6
Basins inches
Roof Drains Remove debris, 4x per year 2x per year
clean inlets draining roof inlet cleaning,
to subsurface bed inspection roof debris as
necessary
Water Quality Remove sediment 1x 4x per year 1x per year or
Units per year or if>8 as necessary
inches
* Recommend sweeping Oct/Nov,Feb/Mar,Apr/May Jul/Aug with late winter most important
Stormwater Control Manager:
E-3 Operations and Maintenance Plan Summary
Operationsi I Lecture Hall at Merrimackr, MA
7 Maild ilstsIIIII
These checklists are provided for the maintenance crew to photocopy and use when
conducting inspections and cleaning activities to the stormwater management systems.
E-4 Operations and Maintenance Plan Summary
Operationsi I Lecture Hall at Merrimackr, MA
Maintenance Checklists
E-5 Operations and Maintenance Plan Summary
Operations and MaintenanceI Lecture Hall at MerrimackCollege, , MA
Catchbasins- Inspect 4 times per year, clean when sediment depth >6 linches or at least once per year.
Sediment Cleaning
Catch I nspected Depth needed Date
Basin (Y/N) (inches) (Y/N) Cleaned Comments(Trash, Oil, Pet waste, Lawn Debris, Damage)
CB 101
Area Drains— Inspect 4 times per year, clean when sediment depth >6 'Inches or at least once per year.
Sediment Cleaning
Catch I nspected Depth needed Date
Basin (Y/N) (inches) (Y/N) Cleaned Comments(Trash, Oil, Pet waste, Lawn Debris, Damage)
AD 102
AD 104
AD 106
AD 108
Water Quality Units- Inspect 4 times per year, clean at least once per year or when sediment reaches a
depth of 8 'Inches.
Water Sediment Cleaning
Quality I nspected Depth needed Date
Unit (Y/N) (inches) (Y/N) Cleaned Comments(Trash, Oil, Pet waste, Lawn Debris, Damage)
WQU 109
E-6 Operations and Maintenance Plan Summary
Operations and MaintenanceI Lecture Hall at MerrimackCollege, , MA
Infiltration/Detention Basins- Inspect once per year, remove sediment lif more than 6 inches has
accumulated 'in sediment forebay or sediment collection row.
Sediment Cleaning
I nspected Depth needed Date
Basin (Y/N) (inches) (Y/N) Cleaned Comments(Trash, Oil, Pet waste, Lawn Debris, Damage)
SYS A
Roof Runoff Downspouts- Inspect roof drams monthly, clean mlets dralinling to the subsurface bed twice
per year.
Sediment Cleaning
I nspected Depth needed Date
Bldg# (Y/N) (inches) (Y/N) Cleaned Comments(Trash, Oil, Pet waste, Lawn Debris, Damage)
Bldg 1
E-7 Operations and Maintenance Plan Summary
Operationsi I Lecture Hall at Merrimackr, MA
Device Location Maps
E-8 Operations and Maintenance Plan Summary
\\vhb.com\gbl\proj\Wat-LD\11625.37 Merrimack Lecture Hall\cad\ld\Eng\Stormwater\BMP and Snow Storage Figure\1162537-BMP and Snow Figures.dwg
Leg end
SNOW STORAGE
TURNPIKE STREET/ROUTE 114 TURNPIKE STREET/ROUTE 114
..... .......
,
e
-_�m4�_e_ _
CATCH BASIN
..,
AREA DRAIN
SOS OUTLET CONTROL STRUCTURE
..........
............. .............. ...........
........................."I Li " ....I......... ............
�R D
ROOF DRAIN
m �: � � - - � - - _ ..... .� »», .� ,.........�� ..... _.... _...., _...�,. �� SUBSURFACE DETENTION BASIN
ti SOS
HERNE ROAD
...............
. . .
NVA SNOW STORAGE LOCATION
tjU
WATER QUALITY UNIT
0
d
S
A,a._�. P CTOE HALL
ss
o
RD00
0
«.
e
.e
A • A
v
OG TDBUC1U
S ,
S ,
b
e
..:........
vvvv
v. v
........................
....
................
.......................
..........
K-11
.............
y e;
r
Q
Q
Z
p
Y ;
y�
Vhb Stormwater BMP Location Plan Figure D1
0 30 60 120 Feet Lecture Hall at Merrimack College
North Andover,MA September 9,2024
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
E-10 Operations and Maintenance Plan Summary
Operations and MaintenanceI Lecture Hall at Merrimack , MA
Snow Storage Areas Map
E-11 Operations and Maintenance Plan Summary
\\vhb.com\gbl\proj\Wat-LD\11625.37 Merrimack Lecture Hall\cad\ld\Eng\Stormwater\BMP and Snow Storage Figure\1162537-BMP and Snow Figures.dwg
Leg end
TURNPIKE STREET/ROUTE 114 TURNPIKE STREET/ROUTE 114
,. ... ..... ,., ,.. SNOWSTORAGE
......
,.. ,. ..
s
............. ....... .............. ..............
AHERNE R
0 D
jNVA
t
PROPOSEDLECTURE USE E11
,,.
c
0
0
0
s
e
--------------
.
vem
r e
A
_v
amp
e,.
A c
e.
e n ----------
\,......
vvv
v_ vvv.v
Q
_ o n
.. s- e
..
�, ..........
..:....
,
Vhb
N� e
J
Q
O
Snow Storage Figure D2
0 30 60 120 Feet Lecture Hall at Merrimack College
North Andover,MA September 9,2024
i
III b Snow Storage Calculations
Project The Lecture Hall at Project# 11625.37
Merrimack College
Calculated by RD Date 9/10/2024
Checked by DT/J K Date
SNOW STORAGE VOLUME SUMMARY
Area to be Plowed: 21,350 s.f. *Assumes 12"snowfall with 40% compaction factor
Storage Volume Required: 12,810 c.f.
Storage Volume Provided: 13,470 c.f.
SNOW STORAGE VOLUME PROVIDED
STORAGE AREA#1:
Storage Height: 5 ft.
Storage Width: 15 ft.
Cross Sectional Area: 50 s.f. *Assumes 7:7 side slope
Storage Length: 141 ft.
Storage Volume 1 Provided: 71050 c.f.
STORAGE AREA#2:
Storage Height: 5 ft.
Storage Width: 20 ft.
Cross Sectional Area: 75 s.f. *Assumes 7:1 side slope
Storage Length: 68 ft.
Storage Volume 2 Provided: 51100 c.f.
STORAGE AREA#3:
Storage Height: 5 ft.
Storage Width: 15 ft.
Cross Sectional Area: 50 s.f. *Assumes 7:1 side slope
Storage Length: 37 ft.
\\vhb\gbl\prof\Wat-LD\11625.37 Merrimack Lecture Hal l\ssheets\Stormwater\11625.37-Snow Storage Calculations 1 of 2
i
III b Snow Storage Calculations
Project The Lecture Hall at Project# 11625.37
Merrimack College
Calculated by RD Date 9/10/2024
Checked by DT/J K Date
Storage Volume 3 Provided: 11850 c.f.
STORAGE AREA#4:
Storage Height: 5 ft.
Storage Width: 15 ft.
Cross Sectional Area: 50 s.f. *Assumes 7:1 side slope
Storage Length: 36 ft.
Storage Volume 3 Provided: 11800 c.f.
STORAGE AREA#5:
Storage Height: 5 ft.
Storage Width: 13 ft.
Cross Sectional Area: 40 s.f. *Assumes 7:1 side slope
Storage Length: 33 ft.
Storage Volume 3 Provided: 11320 c.f.
\\vhb\gbl\prof\Wat-LD\11625.37 Merrimack Lecture Hal l\ssheets\Stormwater\11625.37-Snow Storage Calculations 2 of 2
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
y
F-1 Product Literature
C%il NT CHe
ENGINEERED SOLUTIONS
CDS Guide
Operation, Design, Performance and Maintenance
................. ..................
................
................................................... .............
JV
.. .... ..
..........
/.........
...........
..........
...........
"Ll
CDS@ Design Basics
Using patented continuous deflective separation technology,the There are three primary methods of sizing a CDS system. The
CDS system screens, separates and traps debris, sediment, and Water Quality Flow Rate Method determines which model size
oil and grease from Stormwater runoff.The indirect screening provides the desired removal efficiency at a given flow rate for a
capability of the system allows for 100% removal of floatables defined particle size.The Rational Rainfall Method TM or the and
and neutrally buoyant material without blinding. Flow and Probabilistic Method is used when a specific removal efficiency of
screening controls physically separate captured solids, and the net annual sediment load is required.
minimize the re-suspension and release of previously trapped
pollutants. Inline units can treat up to 6 cfs, and internally bypass Typically in the Unites States, CDS systems are designed to
flows in excess of 50 cfs (1416 Us). Available precast or cast-in- achieve an 80%annual solids load reduction based on lab
place, offline units can treat flows from 1 to 300 cfs (28.3 to generated performance curves for a gradation with an average
8495 Us). The pollutant removal capacity of the CDS system has particle size(d50) of 125 microns(um). For some regulatory
been proven in lab and field testing.
environments, CDS systems can also be designed to achieve an
80%annual solids load reduction based on an average particle
Operation Overview size 050) of 75 microns (um) or 50 microns (um).
Stormwater enters the diversion chamber where the diversion Water Quality Flow Rate Method
weir guides the flow into the unit's separation chamber and In some cases, regulations require that a specific treatment rate,
pollutants are removed from the flow. All flows up to the often referred to as the water quality design flow(WQQ), be
system's treatment design capacity enter the separation chamber treated. This WQQ represents the peak flow rate from either
and are treated. an event with a specific recurrence interval, e.g. the six-month
Swirl concentration and screen deflection force floatables and storm, or a water quality depth, e.g. 1/2-inch (13 mm) of
solids to the center of the separation chamber where 100%of rainfall.
floatables and neutrally buoyant debris larger than the screen The CDS is designed to treat all flows up to the WQQ. At influent
apertures are trapped. rates higher than the WQQ, the diversion weir will direct most
Stormwater then moves through the separation screen, under flow exceeding the WQQ around the separation chamber. This
the oil baffle and exits the system.The separation screen remains allows removal efficiency to remain relatively constant in the
clog free due to continuous deflection. separation chamber and eliminates the risk of washout during
bypass flows regardless of influent flow rates.
During the flow events exceeding the treatment design capacity,
the diversion weir bypasses excessive flows around the separation Treatment flow rates are defined as the rate at which the CDS
chamber, so captured pollutants are retained in the separation will remove a specific gradation of sediment at a specific removal
cylinder. efficiency. Therefore the treatment flow rate is variable, based
on the gradation and removal efficiency specified by the design
engineer.
GRATE INLET Rational Rainfall Method TM
CLEAN OUT (CAST IRON HOOD FOR
(REQUIRED) CURB INLET OPENING) Differences in local climate, topography and scale make every
j site hydraulically unique. It is important to take these factors into
DEFLECTION PAN,3 SIDED �°
consideration when estimating the long-term performance of
(GRATE INLET DESIGN) any Stormwater treatment System. The Rational Rainfall Method
CREST OF BYPASS WEIR
(ONE EACH SIDE) combines site-specific information with laboratory generated
p y
SEPARATION CYLINDER � ,� ""�`
performance data, and local historical precipitation records to
estimate removal efficiencies as accurately as possible.
INLET FLUME
Short duration rain gauge records from across the United States
and Canada were analyzed to determine the percent of the total
annual rainfall that fell at a range of intensities. US stations
D
depths were totaled every 15 minutes, or hourly, and recorded in
115
INLET 0.014ch increments. Depths were recorded hourly with 1-mm
(MULTIPLE PIPES POSSIBLE)
resolution at Canadian stations. One trend was consistent at
VNE
OIL BAFFLE
OUTLET �
all sites; the vast majority of precipitation fell at low intensities
TREATMENT SCREEN l � ,
and high intensity storms contributed relatively little to the total
t annual depth.
11 o
SEPARATION SLAB SUMP STORAGE
These intensities, along with the total drainage area and runoff
,,.
coefficientf r each specific site, are translatedi into flow ra
tes
WE
''' ''� using the Rational Rainfall Method. Since most sites are relatively
small and highly impervious, the Rational Rainfall Method is
appropriate. Based on the runoff flow rates calculated for each
intensity, operating rates within a proposed CDS system are
2
determined. Performance efficiency curve determined from full Two different gradations of silica sand material (UF Sediment
scale laboratory tests on defined sediment PSDs is applied to &OK-1 10)were used in the CDS performance evaluation. The
calculate solids removal efficiency. The relative removal efficiency particle size distributions(PSDs) of the test materials were
at each operating rate is added to produce a net annual pollutant analyzed using standard method "Gradation ASTM D-422
removal efficiency estimate. "Standard Test Method for Particle-Size Analysis of Soils" by a
Probabilistic Rational Method certified laboratory.
The Probabilistic Rational Method is a sizing program Contech OF Sediment is a mixture of three different products produced
developed to estimate a net annual sediment load reduction for by the U.S. Silica Company: "Sil-Co-Sil 106", "#1 DRY" and
a particular CDS model based on site size, site runoff coefficient, 1120/40 Oil Frac". Particle size distribution analysis shows that
regional rainfall intensity distribution, and anticipated pollutant the OF Sediment has a very fine gradation (d50 = 20 to 30 pm)
characteristics. covering a wide size range(Coefficient of Uniformity, C averaged
at 10.6). In comparison with the hypothetical TSS gradation
The Probabilistic Method is an extension of the Rational Method specified in the NJDEP(New Jersey Department of Environmental
used to estimate peak discharge rates generated by storm events Protection) and NJCAT(New Jersey Corporation for Advanced
of varying statistical return frequencies(e.g. 2-year storm event). Technology) protocol for lab testing,the OF Sediment covers a
Under the Rational Method, an adjustment factor is used to similar range of particle size but with a finer d50 (d50 for NJDEP
adjust the runoff coefficient estimated for the 10-year event, is approximately 50 pm) (NJDEP, 2003).
correlating a known hydrologic parameter with the target storm
event. The rainfall intensities vary depending on the return The OK-1 10 silica sand is a commercial product of U.S. Silica
frequency of the storm event under consideration. In general, Sand. The particle size distribution analysis of this material, also
these two frequency dependent parameters(rainfall intensity included in Figure 1, shows that 99.9%of the OK-1 10 sand is
and runoff coefficient) increase as the return frequency increases finer than 250 microns, with a mean particle size(d50)of 106
while the drainage area remains constant. microns. The PSDs for the test material are shown in Figure 1.
These intensities, along with the total drainage area and runoff 1mO ,;.rl,
coefficient for each specific site, are translated into flow rates 90,0 Sediment(Avg),
using the Rational Method. Since most sites are relatively small WO K I 10(Avg)
and highly impervious, the Rational Method is appropriate. Based 70, ° -
on the runoff flow rates calculated for each intensity, operating 60,011,
rates within a proposed CDS are determined. Performance
efficiency curve on defined sediment PSDs is applied to calculate °
_0�1
solids removal efficiency. The relative removal efficiency at each
20.0
XF
,
operating rate is added to produce a net annual pollutant
removal efficiency estimate.
Treatment Flow Rate 1 10 100 1000
The inlet throat area is sized to ensure that the WQQ passes Particl 11
through the separation chamber at a water surface elevation
equal to the crest of the diversion weir.The diversion weir Figure 1. Particle size distributions
bypasses excessive flows around the separation chamber, Tests were conducted to quantify the performance of a specific
thus preventing re-suspension or re-entrainment of previously
captured particles.
CDS unit(1.1 cfs(31.3-L/s) design capacity) at various flow rates,
o o
ranging from 1 /o up to 125/o of the treatment design capacity of
Hydraulic Capacity the unit, using the 2400 micron screen. All tests were conducted
The hydraulic capacity of a CDS system is determined by the with controlled influent concentrations of approximately 200
length and height of the diversion weir and by the maximum mg/L. Effluent samples were taken at equal time intervals
allowable head in the system.Typical configurations allow across the entire duration of each test run. These samples
hydraulic capacities of up to ten times the treatment flow rate. were then processed with a Dekaport Cone sample splitter to
The crest of the diversion weir may be lowered and the inlet obtain representative sub-samples for Suspended Sediment
throat may be widened to increase the capacity of the system Concentration (SSC)testing using ASTM D3977-97 "Standard
at a given water surface elevation. The unit is designed to meet Test Methods for Determining Sediment Concentration in Water
project specific hydraulic requirements. Samples", and particle size distribution analysis.
Performance Results and Modeling
Full-Scale Laboratory Test Results Based on the data from the University of Florida, a performance
model was developed for the CDS system. A regression analysis
A full-scale CDS system (Model CDS2020-5B)was tested at the was used to develop a fitting curve representative of the
facility of University of Florida, Gainesville, FL. This CDS unit was scattered data points at various design flow rates. This model,
evaluated under controlled laboratory conditions of influent flow which demonstrated good agreement with the laboratory data,
rate and addition of sediment. can then be used to predict CDS system performance with respect
3
to SSC removal for any particle size gradation, assuming the Maintenance
particles are inorganic sandy-silt. Figure 2 shows CDS predictive The CDS system should be inspected at regular intervals and
performance for two typical particle size gradations(NJCAT
gradation and OK-1 10 sand)as a function of operating rate. maintained when necessary to ensure optimum performance.
The rate at which the system collects pollutants will depend more
heavily on site activities than the size of the unit. For example,
unstable soils or heavy winter sanding will cause the grit chamber
a m�nY�mauwlrw��w mom��r
80"
"' w rv„w�w w�ww�,
"oil �� to fill more quickly but regular sweeping of paved surfaces will
slow accumulation.
. -------------------- ----..----._._.._._...._...
40 Inspection
� ���. Inspection is the key to effective maintenance and is easily
OK .�AT performed. Pollutant transport and deposition may vary from
,;,� �; year to year and regular inspections will help ensure that the
% % % % % 100 120% 1 % system is cleaned out at the appropriate time. At a minimum,
%Design FlowRate inspections should be performed twice per year(e.g. spring
and fall) however more frequent inspections may be necessary
Figure 2. CDS stormwater treatment predictive performance for in climates where winter sanding operations may lead to rapid
various particle gradations as a function of operating rate. accumulations, or in equipment washdown areas. Installations
Many regulatory jurisdictions set a performance standard for should also be inspected more frequently where excessive
hydrodynamic devices by stating that the devices shall be capable amounts of trash are expected.
of achieving an 80%removal efficiency for particles having a The visual inspection should ascertain that the system
mean particle size(d50) of 125 microns(e.g.Washington State components are in working order and that there are no
Department of Ecology—WASDOE -2008). The model can blockages or obstructions in the inlet and separation screen.
be used to calculate the expected performance of such a PSD The inspection should also quantify the accumulation of
(shown in Figure 3). The model indicates(Figure 4)that the CDS hydrocarbons, trash, and sediment in the system. Measuring
system with 2400 micron screen achieves approximately 80% pollutant accumulation can be done with a calibrated dipstick,
removal at the design (100%)flow rate, for this particle size tape measure or other measuring instrument. If absorbent
distribution (d50 = 125 pm). material is used for enhanced removal of hydrocarbons, the level
of discoloration of the sorbent material should also be identified
Particle Sze I strib i r
1 II ,,, .
rnmmmmmm msmmmm mmmm
>>� �r ��ta�������Iw���utiYa���i�,,;� ,;��,�r�,����4,�,�r�w�A»,�.,�eP,�,!d,�Fw' ,; ,�,;�., �,,�����vn����-A rnlr,O- ,�,�ri;�.»�,�,�,�A;�.»�,��Di�,�,�,;�1���
s 4
,80
_ � _....a�.__.u. .,
m o ,a w u,u,m w u, o u,m ,a m u,w u, ,➢ u, u,o u 9,9 w60
�,,,. ° ,y,.,w �u u, .�..._..�u._m.s._.._u.n.
m a ,➢ w u,u,m 4 u, o u,m R m u,w u, m u, u,o o,u m R u,m a s o I
M q M IW IV IC M I� IV q IV N N M IW M q II N If,
50— .......m.v......m. ...:Y:m.M.S. ,u, u. xm..,wM.w�l IR,I� n.. Iq IV q�N II:N m.m.---
W q W M W W W M W q W A N A W M W W 11 11 q p W A M A W A q q N W
......rrrrrrrrrr urrrr N «« K N N ««rrrrrrrrrrrrrrr� a N P Y N
««mIDrrrrrrrrrrrrrrmlM iM PNrrtrtrtrnYi�rvrr�l PWrr ."A rrrrrrrvX m1l m1l Mi�i�i�101« Mm «rrr�l ullm riM�mrtrtM mN m'M ««r�lYrrrrrrrrrrrrr«rM Ilmrrrrrra mIM J Ilk
A q W M W W W M W q W N ti N W M W A W W g Y 9 W M W W A N 4 W I i
uuum umu� N w W W W'M W W N W'#uu LII N W W W �N W W N#'#N uuum W '# W'#N P#R
Mlmlmlml✓ "i uuum��mmmmdl uuum���l �I room��A uuuu� uuuuJ��mmmmmdfi uuu�al�lu 200- uum
w w ro
m u n w a u m w w u w n u=w w m w u�u n u u w w u u u w j
nm,m,m,r mrt..... ��m'n'mrt�.... �mnn h
�J 9 ,g y y.,g a!' y, 9 y, 9 u 4: ������G: ,g y, y,9 u b ,g y:,g G 9 4 4
h.
......mu�.d.aw.�.aum.m.W W W Y W v.v.m.wv.m. N. N�.# #'M W v... Rm v...m.'# W W N N Y# W .u....m.wmv..,w.vrm....a m,.
,➢ 6 ,ll A N,N,,➢OV Pc tl Q, ,�i' OV pc ,➢ Pc p,Y A,,➢,➢ a !9 Pc,➢Y U,R N,
� u 6 �y y�� y u y- b y e y L 4 y u L S5 � S y/g u y L y;
,
a it
'110 100, 1 Ow, ,DOW
ParticleSize( ii )
r.
Figure 3. WASDOE PSD
u� ,y
dw,
"mmm"`1,25
�f y rs'lr��"i ailrrr
100
u :u ie r IV
ro ,y u; ,y ,.
.�_�.�_.,�_._..®.—®-_.,�__m,_�_.�m.,�.�__u,_.�___._.m_�,_.�,_._.�_.� .�___._.�_,��_._
M R IV IN IV ?W
u u u
� �40
,n +��.".
1 R.� 1 .92 u,
" ��
1�420
7� �y� y
IV IV
_0.931
u �
r 'ILL m
64
III m
P�y�
Design I �FlIow Rate
a
1te
1 0„
u�V
Figure 4. Modeled performance for WASDOE PSD. .u; �r/ urr�,w,?w����
4
during inspection. It is useful and often required as part of an Cleaning
operating permit to keep a record of each inspection. A simple
form for doing so is provided. Cleaning of a CDS systems should be done during dry weather
conditions when no flow is entering the system. The use of a
Access to the CDS unit is typically achieved through two manhole vacuum truck is generally the most effective and convenient
access covers. One opening allows for inspection and cleanout method of removing pollutants from the system. Simply remove
of the separation chamber(cylinder and screen) and isolated the manhole covers and insert the vacuum hose into the sump.
sump. The other allows for inspection and cleanout of sediment The system should be completely drained down and the sump
captured and retained outside the screen. For deep units, a fully evacuated of sediment.The area outside the screen should
single manhole access point would allows both sump cleanout also be cleaned out if pollutant build-up exists in this area.
and access outside the screen.
In installations where the risk of petroleum spills is small, liquid
The CDS system should be cleaned when the level of sediment contaminants may not accumulate as quickly as sediment.
has reached 75%of capacity in the isolated sump or when an However, the system should be cleaned out immediately in the
appreciable level of hydrocarbons and trash has accumulated. event of an oil or gasoline spill. Motor oil and other hydrocarbons
If absorbent material is used, it should be replaced when that accumulate on a more routine basis should be removed
significant discoloration has occurred. Performance will not be when an appreciable layer has been captured.To remove these
impacted until 100%of the sump capacity is exceeded however pollutants, it may be preferable to use absorbent pads since they
it is recommended that the system be cleaned prior to that are usually less expensive to dispose than the oil/water emulsion
for easier removal of sediment. The level of sediment is easily that may be created by vacuuming the oily layer. Trash and debris
determined by measuring from finished grade down to the can be netted out to separate it from the other pollutants. The
top of the sediment pile. To avoid underestimating the level of screen should be cleaned to ensure it is free of trash and debris.
sediment in the chamber, the measuring device must be lowered Manhole covers should be securely seated following cleaning
to the top of the sediment pile carefully. Particles at the top of activities to prevent leakage of runoff into the system from above
the pile typically offer less resistance to the end of the rod than
consolidated particles toward the bottom of the pile. Once this and also to ensure that proper safety precautions have been
followed. Confined space entry procedures need to be followed
measurement is recorded, it should be compared to the as-built if physical access is required. Disposal of all material removed
drawing for the unit to determine weather the height of the from the CDS system should be done in accordance with local
sediment pile off the bottom of the sump floor exceeds 75%of
the total height of isolated sump. regulations. In many Jurisdictions, disposal of the sediments may
be handled in the same manner as the disposal of sediments
removed from catch basins or deep sump manholes. Check your
local regulations for specific requirements on disposal.
p p
m
a
y
u
I
W r
n y
d
r
n �
u
o
4 �
a
N
w
a
y1
Y i
.p
I �
.r J
x
o r,
4 hd r
5
CDS 1515 3 0.9 3.0 0.9 0.5 0.4
CDS2015 4 1.2 3.0 0.9 0.9 0.7
CDS2015 5 1.5 3.0 0.9 1.3 1.0
CDS2020 5 1.5 3.5 1.1 1.3 1.0
CDS2025 5 1.5 4.0 1.2 1.3 1.0
CDS3020 6 1.8 4.0 1.2 2.1 1.6
CDS3025 6 1.8 4.0 1.2 2.1 1.6
CDS3030 6 1.8 4.6 1.4 2.1 1.6
CDS3035 6 1.8 5.0 1.5 2.1 1.6
CDS4030 8 2.4 4.6 1.4 5.6 4.3
CDS4040 8 2.4 5.7 1.7 5.6 4.3
CDS4045 8 2.4 6.2 1.9 5.6 4.3
CDS5640 10 3.0 6.3 1.9 8.7 6.7
CDS5653 10 3.0 7.7 2.3 8.7 6.7
CDS5668 10 3.0 9.3 2.8 8.7 6.7
CDS5678 10 3.0 10.3 3.1 8.7 6.7
Table 1: CDS Maintenance Indicators and Sediment Storage Capacities
Note:To avoid underestimating the volume of sediment in the chamber, carefully lower the measuring device to the top of the
sediment pile. Finer silty particles at the top of the pile may be more difficult to feel with a measuring stick.These finer particles
typically offer less resistance to the end of the rod than larger particles toward the bottom of the pile.
F f
16,
f
w
f
/
I
i
%%%
i//////I%/
u
/u
�f r "rioya l i
i
j
6
CDS Inspection ♦ Maintenance Log
CDS Model: Location:
Water Floatable Describe
Maintenance
Date depth to Layer Maintenance Comments
Personnel
sediment' Thickness' Performed
1. The water depth to sediment is determined by taking two measurements with a stadia rod: one measurement from the manhole opening to the
top of the sediment pile and the other from the manhole opening to the water surface. If the difference between these measurements is less
than the values listed in table 1 the system should be cleaned out. Note:to avoid underestimating the volume of sediment in the chamber,
the measuring device must be carefully lowered to the top of the sediment pile.
2. For optimum performance,the system should be cleaned out when the floating hydrocarbon layer accumulates to an appreciable thickness. In
the event of an oil spill,the system should be cleaned immediately.
7
SUPPORT
�� ' NTECHO
• Drawings and specifications are available at 1107 C
• Site-specific design support is available from our engineers. ENGINEERED SOLUTIONS
800-338-1122
www.ContechES.com
92017 Contech Engineered Solutions LLC,a QUIKRETE Company
Contech Engineered Solutions provides site solutions for the civil engineering industry. Contech's portfolio includes bridges,drainage,sanitary
sewer,earth stabilization and stormwater treatment products. For information on other Contech division offerings,visit www.ContechES.com or
call 800.338.1122
NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY.APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND
DECISIONS,AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION.CONTECH MAKES NO WARRANTY WHATSOEVER,EXPRESS OR IMPLIED,RELATED TO THE
APPLICATIONS,MATERIALS,COATINGS,OR PRODUCTS DISCUSSED HEREIN.ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR
PURPOSE ARE DISCLAIMED BY CONTECH.SEE CONTECH'S CONDITIONS OF SALE(AVAILABLE AT WWW.CONTECHES.COM/COS)FOR MORE INFORMATION.
The product(s)described may be protected by one or more of the following US patents: 5,322,629;5,624,576;5,707,527;5,759,415;5,788,848;5,985,157;6,027,639;6,350,374;6,406,218;
6,641,720;6,511,595;6,649,048;6,991,114;6,998,038;7,186,058;7,296,692;7,297,266; related foreign patents or other patents pending.
OW RECYCLED
cds manual 3/17 PDF tj
PAPER
Operations i I Lecture Hall at Merrimack , MA
Operations and Maintenance Plan I Lecture Hall at Merrimack College, North Andover, MA
This page intentionally left blank.
Operations a i ce Plan I Lecture Hall at Merrimacko ov , MA
G Maintenance Agreement
The Owner(s) hereby agree(s)to that they have read and understood this Operations and
Maintenance Plan and for the length of their ownership will follow and conduct all
inspection and maintenance procedures as stated in Sections A-F at the recommended
intervals, or as could be deemed necessary by any reasonable party,whichever comes first.
� Fr. Bryan Kerns, VP & COS
I::3r a n IKerin p:I.A.. 2.02.E.J. .1.. I[::::::IC:...III
Signature Printed Name
315 Turnpike Street
North Andover,MA01845
Address Telephone Number
Sep 11, 2024
Date
G-1 Mal temnce Agreement