HomeMy WebLinkAbout2017-04-18 Amended Order of Conditions • 1
Horsley Group
Witten G f
s
Sustainable Environmental Solutions
294 washloglon Slreel•Suite 801•Boston,MA D2108
857-263 8193•horsleyvAten corn
March 7, 2017
i
Mr. Robert Douglas, Director
Andover Conservation Commission
36 Bartlett Street
Andover, Massachusetts 01810
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Ref: Amended Order of Conditions
Merrimack College, North Campus Development
315 Turnpike Street, North Andover, MA
MassDEP File#t090-0750
Dear Mr. Douglas and Commission Members:
The Horsley Witten Group(HW) is pleased to provide the Andover Conservation Commission with this
brief letter summarizing our review of the proposed plan modifications for the North Campus
Development at Merrimack College. The Town of Andover Conservation Commission previously issued
an Amended Order of Conditions on August 23, 2016. The proposed North Campus Development
modifications include enlarging the footprints of the proposed Academic Buildings A and C and
expanding the existing Sakowich Campus Center, Academic Building B approved under the August 23,
2016 Amended Order of Conditions is currently under construction. The site's impervious area has
increased and the Applicant has revised the stormwater calculations accordingly. To manage the
additional impervious area the Applicant has directed the additional stormwater runoff towards the Elm
Street Basin,thereby reducing the available stormwater credits previously banked under the Master
Plan.
HW has received the following documents and plans:
• Amended Order of Conditions, MassDEP File No,090-0750(2nd Amendment) issued on August
23,2016,
• Letter to Andover Conservation Commission, prepared by VHB, Request for Amended Order of j
Conditions, dated February 17,2017;
• Site Plans for the North Campus Academic Buildings A&C and Sakowich Campus Center j
Expansion, prepared by VHB, issued February 17, 2017,which includes:
o Cover Sheet and Index
North Campus Academic Buildings A&C;
o Legend and General Notes C-1
o North Campus Context Plan C-2
o Layout and Materials Plan C-3
o Grading, Drainage and Erosion Control Plan C-4
o Utility Plan C-5
o Sanitary Sewer Plan and Profile C-6
Mr. Robert Douglas
Town of Andover
March 7, 2017
Page 2 of 2
o Site Details 1 C-7.1
o Site details 2 C-7.2
o Site Details 3 C-7.3
o Site Details 4 C-7.4
Sakowich Center Expansion
o Layout and Materials Plan C-S3
o Grading and Drainage Plan C-54
o Utility Plan C-S5
North Campus Development
o Existing Conditions Plan of Land Sv-1,dated May 5, 2016
After reviewing the documents and plans listed above, HW is satisfied that the Applicant has provided
adequate stormwater recharge for the additional impervious area proposed and has reduced the
available Peak Flow Credit banked under the Master Plan in compliance with Special Condition 45 of the
Order of Conditions issued on July 17, 2001. HW recommends that the Conservation Commission record
the remaining peak flow credit to be 18.53 cfs as listed in Table 3 of the February 17,2017 letter,
prepared by VHB.
HW further recommends that the Applicant clarify to the Conservation Commission the location of the
proposed trash receptacle and document the number of additional trees that will be removed for the
expansion of the Sakowich Center.
It appears that the proposed stormwater design is in compliance with the original Order of Conditions
dated July 17, 2001,and the Amended Order of Conditions issued on August 23,2016, as well as the
standards of the Massachusetts Department of Environmental Protection (MassDEP)Wetlands
Protection Act (CMR 310 10.00), and the MassDEP Stormwater Handbook dated February 2008. No
additional information is requested.
The Applicant is advised that provision of these comments does not relieve him/her of the responsibility
to comply with all Town of Andover Codes and By-Laws,Commonwealth of Massachusetts laws,and
federal regulations as applicable to this project. Please contact Janet Carter Bernardo at 857-263-8193
or at jbernardo@horsleywitten.com if you have any questions regarding these comments,
Sincerely,
H0RSLEY WITTEN GROUP, INC.
Janet Carter Bernardo, PZ, LEED AP
Senior Project Manager
HAProjects12013113092 Andover Peer Review-M13092F Merrimack CollegelReports12017 Modifctrtion1170307_2nd
PlanModitication_Rcsponse.doex
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April 11, 2017
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Ref: 11625.12
Mr. Robert Douglas, Director
Andover Conservation Commission
Town Office
36 Bartlet Street
Andover, MA 01810
Re. Merrimack College
Athletics District Improvements
315 Turnpike Street, North Andover, MA
MassDEP File 4090-1287 &4090-0750
Dear Mr. Douglas and Commission Members,
On behalf of Merrimack College,VHB provides the following information in response to the peer review
comment letter prepared by Horsley Witten group,Inc. on April 4, 2017, The Horsley Witten comments
are listed below in italics, followed by the VHB responses in bold.
1. Standard 1 states that no new stormwater conveyances may cause erosion in wetlands of the
Commonwealth.
a) The existing subcatchment labeled 3.2 has an outfoll to a wetland resource area which is
hydraulically connected to the Football Field Detention Basin, The Applicant should verify the
current discharge from the existing 30-inch pipe and confirm that the proposed discharge will not
cause erosion within the bordering vegetated wetland. The Applicant has provided a Closed-
Drainage System Hydraulic Analysis which indicates a velocity discharge of 8.54 feet per second
(fps) at the outfall. A number of the pipe segments have not been included,such as(CB 124, DMH
106, DMH 107, DMH 118, and AD 117)HW recommends that the Applicant update the spreadsheet
to include all proposed structures and corresponding flows and recalculate the proposed velocity of
the 30-inch pipe at the out/all,
VHB RESPONSE: The closed-drainage system hydraulic analysis has been updated to
include all structures noted, with an ultimate discharge velocity of 8.54 fps and a flow rate
of 30.9 cubic feet per second (cfs) at the existing outfall under the 25-year design storm
event.
101 Walnut Street
PO Box 9151
Engineers 1 SClehtiStS 1 Planners 1 Designers Watertown,Massachusetts 02471
P 617.924,1770
NVA ([)\Id�L1625 Ro5poi�se to HVJ Pexr Rev!,.-j
Air'r"eAa F 617.924,2286
Mr. Robert Douglas, Director
Ref:11625.12 � ' hb
April 11,2017
Page 2
Under the Volpe Center Expansion Project (2013),this outfall was enhanced with a flared
end section and stone protection to support the full-flow capacity of the 30-inch pipe.The
current flow to the outlet as established under the Volpe Center improvements, is 25.62 cfs
for the 25-year design storm event.The updated Hydraulic calculations have been added to
Appendix A.
2. Standard 2 requires that post-development runoff does not exceed pre-development runoff off--site.
a) The Applicant has provided the HydroCAD calculations to verify that the proposed development is
within the parameters of the originally approved Merrimack College Master Plan (Master Plan). The
Applicant is requesting to subtract an additional 1,20 cubic feet per second(cfs)from the available
credit It appears that the Applicant is in compliance with Standard 2.
VHB RESPONSE: No additional comment.
b) The Applicant has utilized the Football Detention Area as the comparison point between existing
and proposed conditions. This analysis point appears appropriate given the location of this phase of
development. However, HW recommends that the Applicant provided a table illustrating the
existing discharge from the football detention area towards Rock Ridge Road, the allowable
discharge under the Master Plan, and the proposed discharge with this phase of development.
VHB RESPONSE: The following table summarizes the discharge rates (QP) for the Proposed
2020, "Full-Build" Conditions, established under the Merrimack College Master Drainage
Study and Hydrologic Analysis.
I
Storm 24-Hour Full Build Allowable Flow Rate per
Event Rainfall Stormwater Master Plan (cfs)
(year) (in) Football Field Basin Elm Street Basin
2 3.36 12.01 43.95
10 5,04 15.44 66.76
25 5.76 16.88 77.23
50 6.24 17.88 81.31
100 6.40 18.21 82.84
As a Condition of the Volpe Center expansion project,the College has implemented a
Detention Basin Flow Monitoring program to evaluate the discharges from the Football
Field and Elm Street Detention Basins, and equate the flow readings to rainfall events. VHB
is evaluating the most recent data and will submit a memorandum to the Town
summarizing the readings and addressing performance of the basins relative to the Master
Plan. The flow monitoring started 4/20/2012 and to date shows the closest comparable
storm event occurred on 10/22/2014 with a rainfall of 3.66" (greater than 2-year storm
event) and a discharge from the Football Field Basin of 10.63 cfs,still within the limits of
the Master Plan. Monitoring of these flows shall continue through this project to verify all
modifications remain within the allowable rates.
3. Standard 3 requires that the annual recharge from post-development shall approximate annual
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Ref:11625.12 ®
April 11,2017
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recharge from pre-development conditions.
a) The Applicant has noted that due to the site being composed of C and D soils as well as the shallow
depth to seasonal high groundwater the Applicant is meeting Standard 3 to the maximum extent
practicable. The Applicant is proposing to infiltrate stormwater beneath the proposed synthetic turf
field, The Applicant appears to be in compliance with Standard 3.
VHB RESPONSE: No additional comment.
4. Standard 4 requires that the stormwater system be designed to remove 80% Total Suspended Solids
(TSS) and to treat 0.5-inch of volume from the impervious area for water quality.
a) The Applicant has provided the water quality calculations and TSS removal calculations in
accordance with the Massachusetts Stormwater Handbook. The Applicant appears to be in
compliance with Standard 4.
VHB RESPONSE: No additional comment.
5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant loads (LUHPPL).
a) Standard 5 is not applicable to this site.
VHB RESPONSE: No additional comment.
6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone Il or an Interim
Wellhead Protection Area of a public water supply,
a) Standard 6 is not applicable to this site.
VHB RESPONSE: No additional comment.
7. Standard 7 is related to projects considered Redevelopment. A redevelopment project is required to meet
the following Stormwater Management Standards only to the maximum extent practicable:Standard 2,
Standard 3, and the pretreatment and structural best management practice requirements of Standards
4, 5, and 6. Existing stormwater discharges shall comply with Standard 1 only to the maximum extent
practicable. A redevelopment project shall also comply with all other requirements of the Stormwater
Management Standards and improve existing conditions.
a) The proposed project is considered a mix of new development and redevelopment Due to the site F
being composed of C and D soils as well as the shallow depth to seasonal high groundwater the
Applicant is meeting Standard 3 to the maximum extent practicable. The Applicant appears to be in
compliance with Standard 7.
VHB RESPONSE: No additional comment.
8. Standard 8 requires a plan to control construction related impacts including erosion, sedimentation or
other pollutant sources.
a) The Applicant has provided an erosion control plan as required to be in compliance with Standard 8.
The majority of the site work is within North Andover, HW recommends that both Andover and
North Andover Conservation Commissions include special conditions requiring that all stockpiles be
located outside the 100-foot buffer, that a dewatering plan be provided for approval, and that the
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Mr. Robert Douglas, Director f 00
Ref:11625.12
April 11,2017hb
Page 4 y
SWPPP prepared in accordance with the EPA NPDES Construction General Permit be provided to
the Town.
VHB RESPONSE: Noted. Clarification has been added to the project documents verifying
that all stock piles shall be located outside the 100-ft. buffer,that the Contractor submit a
dewatering plan for approval,and that the SWPPP be prepared and submitted to the Town.
b) HW recommends that the Andover Conservation Commission include a special condition to insure
that the contractor minimizes the use of heavy equipment within the area which is utilized as
storage "Football Field Detention Basin`: A small portion of the detention area is proposed to be
regraded to adjust the layout of the existing synthetic multi-use field. The Applicant should provide
clear direction on the site plan, specifically regarding the bottom of the basin at elevation 22Z
VHB RESPONSE: Noted. Site plans will include clarification for the detention area to be
protected to the extent practicable during construction.
c) HW recommends that the Applicant note the number and diameters of trees being removed and
any mitigation measures to limit the amount of trees being removed. HW also recommends that
the Applicant provide the number and diameters of trees proposed to be planted within the buffer
zone of the adjacent wetland resource areas.
VHB RESPONSE: A peer review with LEC Environmental is ongoing in parallel with this
process, in regards to the wetland boundaries and proposed boardwalk design/mitigation.
The design team shall provide a planting plan to identify the number and diameter of trees
being impacted, and mitigation measures to be provided.
Along with this,the number and diameter of plantings proposed within the buffer zone of
the adjacent wetland resource areas shall be identified on the Landscape Plans.
9. Standard 9 requires a Long Term Operation and Maintenance(O&M) Plan to be provided.
a) The Applicant has provided an O&M Plan in Appendix D of the Stormwater Management Report.
The O&M Plan references cleaning the subsurface infiltration system in accordance with the
Storm Tech Inspection and Maintenance manual. However, it does not appear that the proposed
project includes a StormTech system. HW recommends that the Applicant revise the O&M Plan to
reference the proposed stormwater features, including the under-drain system, the trench drains,
and the area drains. HW further recommends that the Applicant provide a sketch in the O&M Plan
that illustrates the location of the various stormwater practices to be maintained.
VHB RESPONSE: Noted. The Long Term Pollution Prevention (LTPPP) Manual and
Inspection Checklist have been updated as requested. Figure DI—Stormwater BMP
Location Plan, has been prepared to identify the locations of all stormwater features to be
maintained.
b) HW recommends that the Applicant indicate potential locations for snow storage on the O&M Plan.
Fencing or markers could be installed so that during the snow season the plowing contractor will not
be allowed to place snow in the wetland resource areas.
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Ref.11625.12 �8�0
April 11,2017
Page 5
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VHB RESPONSE: Noted. Potential snow storage locations have been identified on Figure
D1—Stormwater BMP Location Plan, also stating that snow shall not be stored in the
wetland resource areas. Typically, snow storage will not be performed for the new track
and field, locations shown on DI represent storage locations for snow removal to maintain
accessible paths. In the event snow is to be removed from the field, it shall be stored on
the adjacent track surface.
10. Standard 10 requires an Illicit Discharge Compliance Statement to be provided.
a) HW recommends that the property owner confirm that there are no illicit discharges to a wetland
resource area or into a stormwater management feature.
VHB RESPONSE: An illicit discharge statement has been prepared as requested.
Stormwater Report Appendices have been updated to include Standard 10 Compliance,
11. Based on the information provided in the 2001 Order of Conditions, the Football Field and the Elm Street
detention basins are intended to provide mitigation via a credit system for total increases in post-
development peak rate of runoff with respect to existing conditions under the Master Plan. The Master
Plan provided an additional 62 cfs of stormwater flow that could be mitigated by one of the basins as
the college continued to expand over a 20 year period. As of February 2017, 18.5.E cfs remains available
as peak flow mitigation credit for a 100-year storm event. The Applicant has noted that the proposed
development results in a net increase of 1.20 cfs for the 100 year storm event resulting in a credit
adjustment to 17.23 cfs.
VHB RESPONSE: No additional comment.
12. In accordance with the original 2001 Order of Conditions, under 5.4.2 Protocol for Administrating the
Peak Flow Accounting System;it states, "Upon completion of each authorized phase of construction, the
College shall have their engineering consultant evaluate the effectiveness and function of the drainage
improvements. The engineering consultant shall prepare and submit a report to the Commission
together with any recommendations for improvement or modifications of the drainage system to
maintain the systems performance," HW recommends that the Applicant provide the required
documentation to the Conservation Commission for previous phases that have been completed. HW
further recommends that the Applicant confirm that any drainage improvements associated with any
previously approved phase are completed prior to construction beginning on the Athletic District
Improvements.
VHB RESPONSE: The College has implemented an on-going Detention Basin Flow Monitoring
program to evaluate the discharges from the Football Field and Elm Street Detention Basins,
and equate the flow readings to rainfall events. This monitoring program commenced in April
2012 to support the under the Volpe Athletic Center Expansion_and has documented under the
various project approvals since, that discharge rates from the basins have been in conformance
with the Master Plan.
The monitoring program did identify a discrepancy in performance of the basins under the
Student Residences Project (2013), in which higher than expected peak flows were observed
from the Football Field Detention Basin. Based on following investigations, it was found that
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Mr. Robert Douglas, Director
Ref:11625.12 V0hb
April 11, 2017
Page 6
portions of the detention pond were by-passing the low flow orifice of the outlet control
structure. To address this situation,the outlet control structure was modified to function as
detailed in the Stormwater Master Plan. Monitoring data obtained since has confirmed that
the basins are functioning in conformance with the Master Plan.
An updated memorandum identifying the flow monitoring and addressing the systems
performance,as referenced in response to comment#2b is attached.
13. HW recommends that the Andover Conservation Commission consider requesting that the proposed
adjusted bottom of the Football Detention Area be marked in the field prior to construction and that an
as-built plan of the football detention area be provided at the end of construction to verify that the
proposed stormwater detention volume has been provided
VHB RESPONSE: Noted,clarification has been added to the project documents requesting that
the bottom of the Football Detention Area be marked in the field prior to construction, and
that the Contractor shall provide an as-built plan of the area post-construction to verify that
volumes have been provided.
Merrimack College is very appreciated of the input provided on the project and we look forward to
continuing to work with the Commission and Horsley Witten Group,Inc. We look forward to the
opportunity to present these updates to the Conservation Commission.
Sincerely,
i
Vanasse Hangen Brustlin,Inc.
Jeff Koetteritz, RE,
Senior Project Engineer
ikoetteritz@vhb.com
CC:
Jennifer Hughes, North Andover Conservation Director
Janet Bernardo, Horsley Witten Group,Inc.
Felipe Schwarz, Merrimack College
Gino Baroni,Trident Project Advisors
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ATTACHMENTS:
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• Closed Drainage System Calculations I
• Long Term Pollution Prevention Plan
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• Long Term BMP Maintenance Table
• Figure D1—Stormwater BMP Location Plan
• Illicit Discharge Statement
• Stormwater Flow Monitoring Summary Memorandum
+ Revised Project Plans:
o C-1,0 Legend and General Notes
o C-2.1 Erosion and Sedimentation Control Plan
o C-2.2 Erosion and Sedimentation Control Plan
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Long-Term Pollution
Prevention Plan
Taus Long-Term Pollution Prevention Plan has been developed to establish site
managemment practices that improve the quality of stormwater discharges from the
Project.
Pollutant Control Approach
Maintenance of Pavement Systems
Regular maintenance of pavement surfaces will prevent pollutants such as oil and
grease,trash,and sediments from entering the stormwater management system.The
following practices should be performed:
• RoutileIy pick up and reprove litter from the parking areas,islands,and
perimeter landscaping and vegetated areas.
Maintenance of Vegetated Areas
Proper maintenance of vegetated areas can prevent the pollution of stormwater
runoff by controlling the source of pollutants such as suspended sediments,excess
nutrients,and chemicals From landscape care products.Practices that should be
followed under the regular imaintenance of the vegetated landscape include:
• Inspect planted areas on a semi-aiunual 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
establishiment,
Management of Snow and Ice
Storage and Disposal
Snow shall be stockpiled on standard pavement surfaces and/or upland lawn areas
upstream of stormwater systems so sand and salt may be swept in the spring or
removed as snow melts and drains through the storinwater management system.
Key practices for the safe storage and disposal of snow include:
• Under no circumstances shall snow be disposed or stored in wetland resource
areas.
• Under no circumstances shall snow be disposed or stored in stormwater basins,
ponds,rani gardens,swales,charulels,or trenches.
Salt and Deicing Chemicals
The amount of salt and deicing chemicals to be used on the site shall be reduced to
the-minimum amount needed to provide safe pedestrian and vehicle travel.The
following practices should be followed to control the amount of salt and deicing
materials that come into contact with storrnwater runoff:
• Devices used for spreading salt and deicing chemicals should be capable of
varying the rate of application based on the site specific conditions.
• Sand and salt should be stockpiled under covered storage facilities that prevent
precipitation and adjacent runoff from coning in contact with the deicing
materials
Spill Prevention and Response Plan
Spill prevention equipment and training will be provided by Merrimack College
Initial Notification
hi the event of a spill the facility and/or construction manager or supervisor will be
notified immediately.
Facility Manager(name): James Finn-Director Physical Plant
Facility Manager (phone): (978)835-7023
Construction Manager(name):
Construction Manager(phone):
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.
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Further Notification
Based on the assessment from the Fire Chief,additional notifications to a cleanup
contractor may be made.Tlse Massachusetts Deparhnent 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 maize construction/facility office and readily accessible to all
employees. A hazardous waste spill report shall be Completed as necessary using the
attached form.
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Emergency Notification Phone Numbers
1. FACILITY MANAGER PHONE:
NAME: BEEPER/CELL:
HOMEPHONE:
ALTERNATE CONTACT:
NAME: PHONE:
BEEPER/CELL:.
HOMEPHONE:
2. FIRE&POLICE DEPARTMENT EMERGENCY: 911
3. CLEANUP CONTRACTOR: PHONE:
ADDRESS:
4. MASSACHUSETTS DEPARTMENT OF EMERGENCY PHONE. (978) 694-3200
ENVIRONMENTAL PROTECTION DEP
5. NATIONAL RESPONSE CENTER PHONE: (800)424-8802
6. ANDOVER HEALTH DIVISION: PHONE:978-623-8295
ANDOVER CONSERVATION
COMMISSION: PHONE:978-623-8311
NORTH ANDOVER HEALTH
DEPARTMENT: PHONE: 978-688-9540
NORTH ANDOVER CONSERVATION
DEPARTMENT: PHONE: 978-688-9530
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Hazardous Waste 1 Oil Spill Report I
Date: / / Time: AM/ PM
Exact location
Type of equipment: Male: Size:
License or S/N: Weather Conditions:
On or near water C_l Yes If yes,tiatne of body of water;
11 No
Type of chemical/ oil spilled:
Amount of chemical/ oil spilled:
Cause of spill:
Measures taken to contain or clean up spill:
Amount of chenricaI/ oil recovered: Method:
Material collected as a result of clean up
drums containing:
drums containing:
drums containing:
Location and method of debris disposal:
Name and address of any person,firm,or corporation suffering damages:
Procedures,method,and precautions instituted to prevent a similar occurrence from recurring: :
Spill reported to General Office by: Tune: AM/ PM
Spill reported to DEP/ National Response Center ley:
DEP Date: { / Time: AM/ PM Inspector:
NRC Date: . 1 / Time: AM/PM Inspector:
Additional comments:
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Assessment- Initial Containment
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.
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 Recommended Suppliers
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> SHOVEL 1 ltttp.Vlzvruw.forestry-stcppliers.coiti
> PRY BAR 1 Itettt#43210 — Maiiliole cover pick(or equivalent)
> GOGGLES 1 PAIR Rent#33934 — Shovel(orequivalertt)
> GLOVES--HEAVY 1 PAIR Item#90926 — Gloves(or equivalent)
Item#23334 — Goggles(or equivalent)
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Stormwater Operation and Maintenance Plan
Project Information
Site
Athletics District
Merrimack College
315 Turnpike Street
North Andover,MA
Owner
Name: Jeff Doggett-Chief of Staff-Merrimack College
Telephone: (978)837-5118
Email: doggetq@nierrhxiacl<.edu
Site Supervisor
Name: James Fixm-Director of Physical Plant-Merriinack College
Telephone: (978)837-5275
Cell phone: (978)852-0394
Email: finnj_@merrimack,edu
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Description of Stormwater Maintenance Measures
The following Operation and Maintenance (O&M)program is proposed to ensure the
continued effectiveness of the stormwa ter management system.Attached to this plan
are a Stormwater Best Management Practices Checklist for use during the long term
operation and maintenance of the stormwater management system. Armual reports
of this maintenance/evaluation shall be submitted to the Town of Andover Planning
Division.
Structural Water quality Devices
• hnspect devices in accordance with manufacturer requirements but no less than
twice a year following installation,and no less than once a year thereafter.
• Remove sediment and other trapped pollutants at frequency or level specified by
the manufacturer.
• Sediment and/or floatable pollutants shall be pumped from the basin and
disposed of at an approved offsite facility in accordance with all applicable
regulations.
• F011ow manufacturer instructions for inspection and cleaning and contact
manufacturer if system is malfunctioning.
Deep Sump &Hooded Catch Basins,Area
Drains and Trench Drains
• All catch basins,area drains and trench drains shall be inspected at least
quarterly
• All catch basins,area drains and-trench drains shall be cleaned quarterly or
whenever the depth of the seduient deposits are greater than or equal to one half
the depth from the bottom of the invert of the lowest pipe in the basin.
• Sediment(as described above) 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 grates must be kept free of snow and ice.
• During warmer periods,the grates must be kept free of leaves,litter,sand,and
debris.
Roof Drain leaders
Roof runoff from the proposed building is directed to the closed drainage system.
+ Perform routine roof inspections quarterly
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• Keep roofs clean and free of debris
• Keep roof drainage systems clean
• Keep roof access fin-ited to authorized personnel
• Clean inlets twice per year or as necessary
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Merrimack College—Athletics District Improvements,Andaver/North Andover,Massachusetts
Long Term Best Management Practices—Maintenance/Evaluation Checklist
•NWe:Annual reports of this maintenancelevaluation shall be submf8ed to the Town ofAndoverPlannfng Division.
Best Date CleantnglRepalr Needed Date of
Management Inspection Frequency Inspected Inspector Minimum Maintenance and Key Items to Check Dyes ❑no {List Items) Cleaningfilepalr performed by
Practice
to accordance Wth • Remove sediment 1—sediment storage fdOltf(per manufacturers Dyes Ono
Swctural Water manufacturers recommendations guidelines)
Quality Devices bulno less than Wok a year . Remove og and floatables€n the oWspesdon port(per manufacturers
fd€ovMg[nstagation and no less guldefines)
than once a year thereafter.
Deep Sump and
Hooded Catch basins, Fnurtimes per year Clean accumulated sand and sedimentahenever the depth of deposits is ❑yes ❑no
Area Drams and greater than or equal to one halfthe depth from the bottom oftho Invert
Donch Drains Tar of the lowest p?pe In the basin;
plazas and synthetic Floalables
Feld dfalnage system.
Roof Dtaln Leaders 4x per year Remove roofdebris,dean Inlets Dyes ❑no
Stowwater Control Manager
COE,
AREA
DRAIN
DRAIN
WATER OUALITY UNIT
ROOF DRAIN LEADER
SNOW STORAOE
LOCATION
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VA WE11"In RESOURCE
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SMALL HE STORED ON TME
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"I Athletics Oisflid Improvements
Merrimack College April 6,2017
a 40 80 Feet
N-91,Andover,Massachusetts
Illicit Discharge Statement
The design plans submitted with this report have been designed so that the
components included therein are in compliance with the current MassDEP and
municipal standards as noted. Sanitary sewer and storm drainage structures
remaining from previous development,which are part of the redevelopment area,will
be removed or will be incorporated into updated sanitary sewer and separate
stormwater sewer systems,
All proposed building sanitary connections are to new sanitary sewer systems as part
of the project design.
Measures to prevent illicit discharges are included in the Construction Period and
Long-Term Pollution Prevention Plans included in the Stormwater Report.
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