advanced math & science academy

Advanced Math &Science Academy

Marlborough, MassachusettsStudy for the Forest Street Campus

July 7, 2021

Advanced Math & Science Academy Charter School

Study for the Forest Street Campus

Executive Summary

The Advanced Math & Science Academy Charter School (AMSA) is a public charter school located in

Marlborough, Massachusetts. AMSA is a seven-year comprehensive public charter school, which

currently educates 980 students and has 150 employees.

The school was chartered by the Massachusetts Department of Education in February 2004 and

opened in September 2005. The school’s mission is to create a learning environment which children

of all backgrounds and abilities excel in all subjects, especially in math, science and technology and

celebrate knowledge, empowering them to succeed in the workplace in today’s modern high-tech

world.

AMSA currently occupies all three buildings as follows:

In the past decade AMSA explored whether to stay in their current location or to relocate. This

process included due diligence on the existing site and structures, alternate sites, and a

determination of the financial capacity to finance the acquisition, their program needs and building

upgrades. This investigation has resulted in the decision to remain in the current location, to acquire

the other two buildings on the site and their related lots. AMSA currently owns 165 Forest Street

and will be acquiring 199 and 201 Forest Street this fall.

The investigations which were undertaken led to the following conclusions and priorities: As part of

the financing for the acquisition, AMSA has the ability to finance an estimated $12M in improvements

to the campus. These improvements have been prioritized by the school as follows:

• Site improvements to create a campus center. These improvements include changes to

vehicular circulation to create a central pedestrian zone, and the location of a centrally

located gymnasium structure shared by all grades. The gymnasium has been proposed as a

pre-engineered structure. Excerpts of the Concept Plan are provided for reference

throughout the study.

• The build-out of the top two floors (approximately 24,000sf) of 165 Forest Street to provide

additional flexible classroom space.

• Building system renovations and code compliant improvements to buildings 201 and 199

Forest Street, as allowed by the available budget.

The following permitting requirements are anticipated as part of the project:

• Compliance with Conservation Commission requirements and DEP relative to bordering

wetlands. Two options for locating the gymnasium have been identified: depending on the

location selected, the project may result in an increase in impervious area that will need to

be managed on site.

• Site Plan Approval by the Marlborough Planning Board

• Depending on the value of improvements to the buildings, code improvements may be

required. The assessed values are likely to be updated in the City’s records as part of

closing on the acquisition, which is anticipated in the early fall.

Financing for the project will come from a combination of AMSA equity and a tax-exempt bond

issued through MassDevelopment.

The following documents incorporate the background for the priorities identified above:

Site Improvements and Gymnasium location (attached):

• Concept Master Plan dated 4/13/2018 by Arrowstreet. This document developed the

notion of a centralized pedestrian campus, as well as a gymnasium that could be utilized for

swing space. Subsequent analysis determined that the gymnasium should be sized for

athletic use only, and that building system renovations would be undertaken during

summers and/or on an occupied basis. The gymnasium in this study was tentatively located

between Buildings 165 and 199. Excerpts of the Concept Plan are provided throughout this

study.

• AMSA Marlborough Campus Conceptual Circulation Plan dated 6/7/2021 by MDM

Transportation. This drawing is a result of developing an approach to unified vehicular

circulation for the entire site while maintaining the center “campus” and offered an

alternative location for a smaller (14,000sf) gymnasium.

Building Improvements (attached):

• Concept Plan for 165. As part of Arrowstreet’s work in the Concept Master Plan noted

above, the attached concept plan for the upper two floors of this building was developed

for a set of flexible classrooms.

• Building systems. As part of Arrowstreet’s team, Garcia, Galuska, Desousa Inc. documented

the visible components of the building systems.

Cost Estimate (following):

• AMSA Conceptual Cost Estimate dated 4/28/2021 by Walker Construction. Following is an

estimate of the scope of work currently anticipated as part of the project.

This study and its resulting priorities also incorporates the following by reference:

• Site and Utility Survey by Odone Survey & Mapping dated 7/25/2013

• Existing Building Plans by Arrowstreet (actual dimensions will require verification)

• The following selected and applicable sections of Arrowstreet’s Concept Master Plan,

including:

• Civil Summary: section 2.4

• Existing System Documentation by Garcia, Galuska & Desousa, Inc.: sections 2.5-2.8

• Structural Evaluation of 165 Forest Street by McNamara Salvia: section 2.9

Site Improvements and Gymnasium Location

Alternative 1: Arrowstreet Conceptual Site Plan, April 2018

Alternative 2: MDM Conceptual Traffic Plan, dated June 9, 2021

Building Improvements

Concept Plan for buildout of flexible classrooms, upper floors of 165 Forest by Arrowstreet, dated

April 2018

The following are included as attachments:

• Site and Utility Survey by Odone Survey & Mapping dated 7/25/2013

• Excerpts from Arrowstreet’s Concept Master Plan dated April 13, 2018 documenting

existing conditions:

o 2.2: Architecture Improvements

o 2.4: Civil Engineering Design Narrative

o 2.5: Plumbing Existing Conditions Report

o 2.6: HVAC Existing Conditions Report

o 2.7: Fire Protection Existing Conditions Report

o 2.8: Electrical Existing Conditions Report

o 2.9: Structural Evaluation of 165 Forest Street

o 3.6: 165 Forest Street-Existing Plans (dimensions will require verification)



• AMSA Marlborough Campus Conceptual Circulation Plan by MDM Transportation

Consultants dated 6/7/2021

April 13, 2018 — draft for pricing

Roof above Day Care entry

Cell tower electrical wiring

Dryer vents

2.2 Architecture Improvements

165 Forest Street, Marlborough, MA

Cell tower electrical wiringThe cellphone tower tenant feeder conduit and communications conduit is running exposed within the existing fire rated stairwell. This condition would not be allowed by today’s code. Code officials may require that the conduit be rerouted outside of the fire rated stairwell.

Dryer vents There is an existing dryer vent that is exposed within the existing fire rated stairwell. This condition would not be allowed by today’s code. Code officials may require that the duct work be rerouted outside of the fire rated stairwell.

Roof above Day Care entryThe lower roof membrane on the east side of the building, above the Day Care entry appears to be buckling, patched with tape and needing replacement. Additionally, while there are no current pressing concerns, the owner would like to replace the build-ing’s ballasted roof in tandem with the mechanical systems that are recommended to be replaced.

A r r o w s t r e e t ADVANCED MATH & SCIENCE AC ADEMY Marlborough, Massachusetts

Begin Excerpt of Arrowstreet Conceptual Master Plan


ElevatorCurrently, there is no lock-out on the elevator, which would allow restricted access to the different floors. Additionally, the elevator does not appear to be interlocked with the fire alarm system for recall.

WindowsThe seal appears to be compromised in roughly 15-20% of the windows. Recommend to replace those affected windows.

Water infiltration at First Floor levelThere were reports of occasional water infiltration into the first level, specifically during heavy rainfall. The site surrounding the existing playground along the north, and side playground along the east may need to be regraded so that the water is directed away from the building.

Existing Elevator

Existing window

Water infiltration




Dryvit stucco systemThe exterior of the building has areas that have been patched, and others that may need to be patched to prevent water infiltration to the dryvit cavity. Assume 15% of the exterior will need repair.

Existing dryvit at play area on east

Above AMSA entry on west

Above day care entry on east




2.4 Civil


MEMORANDUM Re: AMSA Charter School Forest Street Master Campus – Marlborough SCI File # 17213.02 To: Meryl Nistler, AIA, LEED AP – Arrowstreet From: Jeffrey Pilat April 13, 2018 This memorandum provides conceptual site design narrative for the proposed AMSA Charter School at the Forest Street Campus. This Design narrative is based on a PDF of the AS-BUILT PLAN by Acton Survey & Engineering dated 7/25/1998 rev.11/06/1998 and a PDF plan with no title block identified as 180208_ForestStreetParking. Water: Approx. 250 lf of 6-inch CLDI to tie into hydrants Assuming 2 fire hydrants and gate valves, one new and one relocated Assuming 1 tee for water connection Assuming 400 lf of 6-inch CDLI fire protection line to the gymnasium from the campus loop main. Assuming 400 lf of 4-inch CDLI domestic line to the proposed gymnasium from the campus loop main. Flow testing on existing water lines & hydrants recommended. Stormwater Management System: Assuming 5 drain manholes Assuming 1 Water Quality Unit Assuming 5 catch basins Approx. 200 lf 12” RCP drain line Approx. 20 lf 15” RCP drain line Approx. 100 lf 6” PVC roof drain Approx. 100 lf 15” PVC drain line Approx. 500 lf 10” PVC drain line Approx. 100 concrete 4’ x 4’ x 4’ galleys w/ 2’ of washed stone all around Sewer: The proposed will require a sewer line connection to the campus main. Approx. 400 lf 4” PVC sewer line Assuming 5 sewer manholes Electrical: Due to the proposed gymnasium building and parking lot reconfiguration the existing transformer and approx.20 light poles may need to be relocated. (Confirm with MEP) Paving: The existing parking lots, sidewalks will need to be removed, replaced with a new parking lot and proposed improvements. Assuming approx. 40,000 sf of new bituminous pavement. Assuming approx. 50,000 sf of bituminous pavement pulverized. Assuming approx. 30,000 sf of new concrete walks Assuming approx. 4,000 lf of new precast concrete curbing. Assuming approx. 40 lf of 10-15‘ high block wall.

Samiotes Consultants, Inc. Civil Engineers + Land Surveyors 20 A Street Framingham, MA 01701-4102 T 508.877.6688 F 508.877.8349 www.samiotes.com

AMSA Charter School – Forest Street Master Campus Plan Conceptual Site Design Narrative 4/13/18 Erosion Control: Assuming approx. 500 lf of siltation fence and straw wattles. Assuming 10 silt sacks Bollards: Assume 10 removable bollards PERMITTING Due to wetland resource areas located on and adjacent to the site, the proposed project will require approval from the Marlborough Conservation Commission and DEP at a minimum. Prior to beginning construction, due to over an acre of disturbance the project site will require to develop a Stormwater Pollution Prevention Plan SWPPP and filing with the EPA. In this situation, the Conservation Commission approved plans are the prerequisite for the site plan approval plans to the Marlborough Planning Board. The Permitting timeline may take up to 11 months after submission.

Marlborough DPW: approximately 60 Days Marlborough ZBA: approximately 60 Days Marlborough Conservation Commission: approximately 90 Days Marlborough Planning Board: approximately 90 Days NPDES/SWPPP: approximately 28 Days

ZONING

Existing condition: Based on the previous “As-built Plan” by Acton Survey & Engineering zoning chart it appears the site is pre-existing non-conforming specifically the zoning requirements for side setbacks and possibly building height do not comply. Proposed condition: The proposed conditions would increase the square footage thus requiring additional parking. With the current conceptual plan and increase in the proposed building additions we believe we would not comply with the parking requirement. It appears that the project additions would also exceed the 30’ height requirement. The setback, height and parking requirements may be waived due to the Dover Amendment. We recommend the next steps would be:

1. ALTA plan to confirm the property lines and review any potential encroachments. 2. Coordinating with the City of Marlborough regarding any existing special permits and future amendments.

AMSA Charter School – Forest Street Master Campus Plan Conceptual Site Design Narrative 4/13/18 Chapter 650-24F (9) Wetland Buffer Fifty-foot wetland buffer zone. No disturbance of the ground surface or development within 50 feet of a wetland resource area defined under MGL c. 131, § 40, (except the floodplain and isolated land subject to flooding) shall be permitted. Development shall mean any clearing, grading, earthmoving or construction of any kind. We believe with the current layout we would not do any work within the 50’ buffer, however the wetland limits will need to be confirmed by a wetland scientist. p:\projects\2017\17213.02 amsa c.s. forest street campus\documents\correspondence\master campus 4-13-18 .doc


2.5 Plumbing


GARCIA • GALUSKA • DESOUSA Consulting Engineers Inc.

Advanced Math & Science Academy Charter School (AMSA)

165 Forest Street Building

Plumbing Existing Conditions Systems Report

J#630 020 00.00

L#60687/Page 1/April 5, 2018

TEL 508-998-5700 FAX 508-998-0883 email: [email protected]

Plumbing Existing Conditions Report:

165 Forest Street

Executive Summary:

Presently, the Plumbing Systems serving the building are cold water, hot water, sanitary, waste and vent

system, storm drain piping, and natural gas. Municipal sewer and municipal water service the Building.

The majority of the plumbing systems are original to the building. Portions of the system have been

updated as part of building upgrade projects. The plumbing systems, while continuing to function, have

served their useful life. The building plumbing systems could continue to be used with maintenance and

replacement of failed components; however other non-dependent decisions will likely force the plumbing

upgrade. Due to its age, complete new water piping systems are recommended. The copper piping is in

fair condition and has served its useful life.

The plumbing fixtures are in fair condition. Attempts have been made to make bathroom fixtures

accessible, however, the majority of fixtures do not meet current accessibility codes. In general, the

fixtures appear to have served their useful life. Current Access Code requires accessible fixtures

wherever plumbing is provided. In terms of the water conservation fixtures, their use is governed by the

provisions of the Plumbing and Building Code. Essentially, the code does not require these fixtures to be

upgraded, but where new fixtures are installed, as may be required by other codes or concerns, the new

fixtures need to be water conserving type fixtures. All new fixtures are recommended.

Cast iron is used for sanitary and storm drainage. Rainwater from roof areas is collected by interior rain

leaders which appear to discharge to a below grade drainage system. Where visible, the cast iron pipe

appears to be in fair condition. Smaller pipe sizes appear to be copper. In general, the drainage piping

can be reused where adequately sized for the intended new use.

New domestic water heater has been provided, there is no thermostatic mixing valve.

Fixtures:

The water closets are mix of wall hung and floor mounted vitreous china with manual flush valves.

Urinals are wall hung vitreous china with manual flush valves.

Lavatories are mix of counter type with drop in vitreous china and under mount stainless steel. The

lavatories faucets are mix of sensor type and manual single lever type. No mixing valves have been

installed. Accessible lavatories are fitted with hot and cold-water handle faucets.





J#630 020 00.00

L#60687/Page 2/April 5, 2018

Water Closet Floor Mounted Water Closet/Urinal Wall Hung

Counter Lavatory Stainless Steel Counter Lavatory China

Drinking fountains consist of wall hung stainless steel and lower levels have been replaced with fountain

and bottle filling station.

Electric water coolers are wall hung, non-accessible.

Fountain /Fill Station Abandoned Water Cooler





J#630 020 00.00

L#60687/Page 3/April 5, 2018

Janitor's sink are free standing fiberglass and floor mounted type. Faucets

are not equipped with vacuum breakers.

Water Systems:

The main domestic water service is located in the building fire/plumbing

room. The service is 2" in size and includes a 1-1/2" meter and pressure

reducing valve. The main domestic cold-water distribution is 3" in size. The

majority of the domestic distribution piping is located above ceilings and in

shaft walls

The secondary water meter has been removed, believe it was for the

irrigation system.

Water Service Irrigation Service

Piping, where exposed, appears to be copper with sweat joints. The majority

of the piping is insulated. Due to the lack of accessibility a major renovation

should include all new domestic water piping. Domestic hot water for the

entire building is supplied from Rheem 80 gallon electric tank type heater.

The building is provided with one hot water return piping system with Taco

in-line pump.

Gas:

The building is supplied with eight gas meters, one main building meter and

seven tenant meters. The gas piping runs up the exterior of the building and

on the roof to feed the rooftop units.

Gas piping is black steel with a combination of screwed and welded joints

and fittings depending on the time of installation.

Service Tub Sink

Domestic Water Piping





J#630 020 00.00

L#60687/Page 4/April 5, 2018

Gas Meters Gas Piping Risers

Gas Piping on Roof Gas Piping on Roof

Drainage Systems:

Cast iron is used for sanitary and storm drainage. Where visible, the cast iron pipe appears to be in fair

condition. Smaller pipe sizes appear to be copper.

In general, the cast iron drainage piping can be reused even in a major renovation where adequately sized

for the intended new use.

Typical Roof Drain Typical Sanitary Waste Piping





J#630 020 00.00

L#60687/Page 5/April 5, 2018

Typical Rain Water Piping

Recommendations:

• Provide new backflow preventer on domestic water service.

• Provide all new domestic water piping.

• Provide all new plumbing fixtures.

• Provide new master mixing valve.



199 & 201 Forest Street Buildings


J#630 020 00.00

L#60246/Page 1/March 9, 2018


Plumbing Existing Conditions Report

199 Forest Street

Existing Conditions:


system, special waste system, storm drain piping, and natural gas. Municipal sewer and municipal water

service the Building. The building was constructed in 1992.

Fixtures:

The water closets are wall hung vitreous china with manually operated flush valves.

Urinals are wall hung vitreous china with manually operated flush valves.

Lavatories are counter mounted vitreous china with manual hot and cold water handle mixing faucets.

Electric water coolers are wall hung with single stainless steel bowl. Water cooler on First Floor has a

bottle filler.

Janitor's sinks are floor mounted mop receptors with faucets equipped with vacuum breakers.

Warming Kitchen has a stainless steel single bowl sink with gooseneck faucet and residential type

dishwasher.

Science classrooms have resin type sinks with gooseneck faucets, no vacuum breakers. Sinks are fed with

cold water only.

Science classrooms have emergency showers. Showers appear to be supplied with cold water only and it

is reported showers do not operate properly.

Urinal Typical Lavatories Electric Water Cooler





J#630 020 00.00

L#60246/Page 2/March 9, 2018

Mop Receptor Kitchen Sink Emergency Fixture

Water Systems:

Domestic water service enters in a Classroom Closet. Service is 1-1/2” in size.

Domestic water piping is copper with sweat joints. The piping is not insulated. Piping appears to be in

good condition.

There is a ¾” reduced pressure backflow preventer for lawn irrigation.

Domestic hot water is generated through point of use electric water heaters located throughout the building.

Gas:

The building is supplied with natural gas. There are a total of

seven gas meters located on the exterior of the building.

Gas is supplied to HVAC equipment and the Science Rooms;

however, Science Room gas turrets are not connected.

Gas piping is black steel with screwed joints and fittings.

Natural Gas Meters





J#630 020 00.00

L#60246/Page 3/March 9, 2018

Drainage Systems:

Cast iron is used for sanitary and storm drainage. Where visible, the cast

iron pipe appears to be in good condition. Smaller pipe sizes appear to be

copper.

In general, the cast iron drainage piping can be reused even in a major

renovation where adequately sized for the intended new use.

Science Classrooms are plumbed with acid resistant plastic pipe with

solvent welded fittings. Sinks are fitted with local point of use

neutralizers.

Acid neutralizer

201 Forest Street



system, and natural gas. Municipal sewer and municipal water service the Building. The building was

constructed in 1980.

Fixtures:

The water closets are wall hung vitreous china with manually operated flush valves.

Urinals are wall hung vitreous china with manually operated flush valves.

Lavatories are counter mounted vitreous china with manual hot and cold water handle mixing faucets.

Some faucets have been replaced with sensor type.

Electric water coolers are wall hung with single stainless steel bowl.

Janitor's sinks are floor mounted mop receptors with faucets equipped with vacuum breakers.

Kitchen has a stainless steel single bowl sink with gooseneck faucet and residential type dishwasher.





J#630 020 00.00

L#60246/Page 4/March 9, 2018

Water Closet Typical Urinals Countertop Lavatories

Water Cooler Kitchen Sink Natural Gas Meter

Water Systems:

Domestic water service enters in the Health Classroom Closet. Service is 2” in size with a 2” meter and

pressure reducing valve.

Domestic water piping is copper with sweat joints. The piping is insulated. Piping appears to be in good

condition.

Domestic hot water is generated through tank type electric water heater. Heater has three 6 kW heating

elements and 119 gallons of storage. There is no mixing valve on the system.





J#630 020 00.00

L#60246/Page 5/March 9, 2018

Gas:

The building is supplied with natural gas. Meter located on the exterior of the building.

Gas is supplied to HVAC equipment.

Gas piping is black steel with screwed joints and fittings.

Drainage Systems:

Cast iron is used for sanitary and storm drainage. Where visible, the cast iron pipe appears to be in good

condition. Smaller pipe sizes appear to be copper.

In general, the cast iron drainage piping can be reused even in a major renovation where adequately sized

for the intended new use.

Recommendations:

Based on our observations and findings, we recommend the following system renovations and

improvements for the buildings and proposed additions.

1. CODES

A. All work installed under Section 220000 shall comply with the MA Building Code, MA

Plumbing Code and all state, county, and federal codes, laws, statutes, and authorities

having jurisdiction.

2. DESIGN INTENT

A. All work is new and consists of furnishing all materials, equipment, labor, transportation,

facilities, and all operations and adjustments required for the complete and operating

installation of the Plumbing work and all items incidental thereto, including commissioning

and testing.

3. GENERAL

A. The Plumbing Systems that will serve the project are cold water, hot water, tempered water,

sanitary waste and vent system, special waste system, and natural gas.

B. The Building will be serviced by Municipal water and Municipal sewer system.

C. All Plumbing in the building will conform to Accessibility Codes and to Water Conserving

sections of the Plumbing Code.





J#630 020 00.00

L#60246/Page 6/March 9, 2018

4. DRAINAGE SYSTEM

A. New cast iron Soil, Waste, and Vent piping system is provided to connect to all new fixtures

and equipment. In existing buildings system runs will connect to existing building

infrastructure. For building addition new 6-inch sanitary service will be provided.

B. Drainage system piping will be service weight cast iron piping; hub and spigot with gaskets

for below grade; no hub with gaskets, bands and clamps for above grade 2 in. and larger.

Waste and vent piping 1-1/2 in. and smaller will be type ‘L’ copper.

C. A separate Special Waste System shall be provided starting with a connection to an interior

limestone chip acid neutralizer, running thru the building to collect new science classroom

fixtures and terminating with vent terminals through the roof. Special Waste and Vent

piping will be Schedule 40 electric heat fused polypropylene piping, fittings and traps,

flame retardant above grade and non-flame retardant below ground.

5. WATER SYSTEM

A. Existing domestic water services for Buildings 199 and 201 will remain and continue to

supply the fixtures in those buildings.

B. Provide new cold water distribution piping to all new plumbing fixtures. New water piping

shall connect to the existing building distribution system.

C. Domestic hot water heating for new fixtures will be provided by point-of-use electric

instantaneous water heaters.

E. Water piping will be type ‘L’ copper with wrot copper sweat fittings, silver solder or press-

fit system. All piping will be insulated with 1 in. thick high density fiberglass.

F. A dedicated non-potable cold and hot water system will be provided to Science

Classrooms. Water system will be protected with a reduced pressure backflow preventer.

A dedicated tank type water heater will be provided to deliver hot water to all Science

Classroom sinks.

G. Tepid (70 deg. F – 90 deg. F) water will be provided to the emergency shower/eyewash

fixtures in Science Classrooms as required by code.

6. GAS SYSTEM

A. Natural gas service will be provided for the new HVAC and plumbing equipment. New

dedicated gas supply will be provided from the existing meter locations to service the new

equipment. Existing gas piping will be demolished.

B. New gas piping will be Schedule 40 black steel pipe with threaded gas pattern malleable

fittings for 2 in. and under and butt welded fittings for 2-1/2 in. and larger.





J#630 020 00.00

L#60246/Page 7/March 9, 2018

7. FIXTURES

A. Furnish and install all new fixtures, including supports, connections, fittings, and any

incidentals to make a complete installation where required by the renovation and to meet

required fixture count of Code.

B. Fixtures shall be the manufacturer’s guaranteed label trademark indicating first quality.

All acid resisting enameled ware shall bear the manufacturer’s symbol signifying acid

resisting material.

C. Vitreous china and acid resisting enameled fixtures, including stops, supplies and traps

shall be of one manufacturer by Kohler, American Standard, or Eljer, or equal. Supports

shall be Zurn, Smith, Josam, or equal. All fixtures shall be white. Faucets shall be

Speakman, Chicago, or equal.

E. Fixtures shall be as scheduled on drawings.

1. Water Closet: High efficiency toilet, 1.28 gallon per flush, wall hung, vitreous china,

siphon jet. Sensor operated 1.28 gallon per flush battery flush valve.

2. Urinal: High efficiency 0.13 gallon per flush urinal, wall hung, vitreous china. Sensor

operated 0.13 gallon per flush battery flush valve.

3. Lavatory: Wall hung/countertop ADA lavatory with 0.5 GPM metering mixing faucet.

4. Staff Sink: ADA stainless steel countertop sink with gooseneck faucet and 0.5 GPM

aerator.

5. Drinking Fountain: Barrier free hi-low wall mounted electric water cooler, stainless

steel basin with bottle filling stations. New water coolers to be provided on every floor.

6. Art Room Sink: ADA stainless steel sink, type 316, with gooseneck faucet and 0.5

GPM aerator. Include Zurn Z-1180 solids trap at each sink.

7. Science Laboratory Sinks: Faucets with vacuum breakers and 0.74 GPM aerators.

8. DRAINS

A. New Drains are cast iron, caulked outlets, nickaloy strainers, and in waterproofed areas

and roofs shall have galvanized iron clamping rings with 6 lb. lead flashings to bond 9 in.

in all directions. Drains shall be Smith, Zurn, Josam, or equal.

9. VALVES

A. Locate all valves so as to isolate all parts of the system. Shutoff valves 3 in. and smaller

shall be ball valves, solder end or screwed, Apollo, or equal.





J#630 020 00.00

L#60246/Page 8/March 9, 2018

10. INSULATION

A. All water piping shall be insulated with snap-on fiberglass insulation Type ASJ-SSL, equal

to Johns Manville Micro-Lok HP.

11. CLEANOUTS

A. Cleanouts shall be full size up to 4 in. threaded bronze plugs located as indicated on the

drawings and/or where required in soil and waste pipes.

B. Cleanouts for Special Waste System shall be Zurn #Z9A-C04 polypropylene cleanout plug

with Zurn #ZANB-1463-VP nickel bronze scoriated floor access cover.

12. WATER HEATER

A. New gas fired, tank type, condensing water heaters. One water heater in each existing

building and new water heater for addition.


2.6 HVAC





HVAC Existing Conditions Systems Report

J#630 020 00.00

L#60694/Page 1/April 5, 2018


HVAC Existing Conditions Report:

165 Forest Street

The building is served by eight (8) constant volume rooftop units. All eight units are manufactured by

Carrier; one was recently replaced. The recently replaced Carrier unit is a model

48TCFD16ACA6AGA0A0, which is a 15 ton cooling unit with high heat and economizer. The unit was

manufactured in June 2017. All other Carrier units are 48TJF16---681QA which are 15 ton cooling units

with high heat and economizer. The “TJ” designation indicates they are constant volume units. We

contacted Carrier and were informed the other seven units were manufactured in 2002. The units are

approximately 16 years old and near the end of their life expectancy (typical life expectancy is 20 years).

Rooftop Tag Information (New Unit) Rooftop Tag Information (Old Unit)

The general system arrangement is for two rooftop units to serve one floor; one unit serves the North side

and another unit serves the South side at each floor. There are individual air volume zone dampers in the

supply ductwork to respective spaces (zones) that provide individual space control. The rooftop units are

constant volume with a bypass damper installed between the supply and return off the rooftop unit. As

individual zone dampers close, the bypass damper opens providing a path for the constant air to flow.

Unit Bypass Damper Zone Damper





J#630 020 00.00

L#60694/Page 2/April 5, 2018


The HVAC system installed is a Variable Volume Variable Temperature (VVT) system. The system

provides continuous air circulation with constant volume. The system is comparable to the HVAC system

at 199 Forest but varies slightly in how it operates. The zone dampers are a model ZDB1-series

manufactured by Lennox Corp. The zone dampers have two modulating dampers within the unit; one

regulates the air from the rooftop unit and the other regulates return air from the space. The two air

streams combine to provide constant volume to the zone. If the zone is satisfied, the damper from the

RTU will modulate closed and the return damper modulates opens, and the zone damper will recirc room

air. Additionally, as the zone damper closes from the rooftop unit, the bypass at the rooftop will open to

recirculate the air at the unit.

From what we witnessed on the upper floors, it appears the supply ductwork was insulated and the return

ductwork installed is not. There is minimal return ductwork which penetrates the chase into the space and

is left open ended. The above ceiling space is considered a return air plenum. The plenum allows zone

return air to flow back to the rooftop unit.

Existing Ductwork with Insulation Existing Controls at Lower Level Electric Room

Third Floor Space Demo





J#630 020 00.00

L#60694/Page 3/April 5, 2018


Miscellaneous items within the building

• We did not witness any heat source at the main entry Vestibule. The space was warm but we

could not locate the equipment serving the space.

• In the main electric room, there are three (3) small transformers, which will give off heat to the

space. Typically, an exhaust fan or ductless cooling unit is installed to prevent overheating of the

space.

• There is a room on the First Floor South West corner that was compared to a “Greenhouse”. The

space is large and has additional windows. It was mentioned the room gets too hot and cannot be

used.

• There is no dedicated ductless cooling unit in the Server room.

Recommendations:

Seven rooftop units are approximately 16 years old and should be removed and replaced with new. Based

on the proposed layout, it appears the 15 ton units may be borderline, and upsizing to a 17-1/2 ton unit

may be required. Units shall be selected for a Variable Air Volume application. Final determination on

unit sizing would be made during design. The existing ductwork in the chase could be reused if the units

are upsized slightly.

We did not view the ductwork layout on the First and Second Floor. The ductwork shall remain and be

reworked as necessary to suit any new architectural revisions.

The third floor has been completely demolished. All new supply ductwork will be required.

There is a supply ductwork layout on the fourth floor. We would recommend removing all ductwork and

installing new based on the proposed layout.

We would recommend Variable Air Volume (VAV) boxes with hot water reheat coils be added for

individual control of each room.

This heating plant shall include:

• Two (2) 1 million BTU heating hot water boilers, with associated pumps, expansion tank etc. for

a complete operating heating plant

• Provide a heating hot water piping loop within the building.

• Provide VFD’s to control the hot water pumps.

The controls shall be upgraded. Presently, there are Carrier rooftop units, with Lennox dampers and

Honeywell controllers. The system should be standardized and can tie into a new control system used

within the Campus.





J#630 020 00.00

L#60247/Page 1/March 9, 2018



199 Forest Street

The building is primarily served by six (6) constant volume rooftop units. All six units are high efficiency

Trane YCD181C4LAAA, which is a nominal 15 ton cooling unit that provides 6,000 CFM of conditioned

air to its respective zone. The “L” in the model number indicates the units are a low heat model with a

natural gas input of 250,000 BTUh. The first “A” after the “L” indicates the units are provided with a

downflow economizer option supplied by the unit manufacturer.

Rooftop Tag Information Rooftop Controllers

The general system layout is for two rooftop units to serve one floor; one unit serves the East side and one

unit serves the West side at each floor. There are individual air volume zone dampers in the supply

ductwork to respective spaces (zones) that provide individual space control. The rooftop units are

constant volume with a bypass damper installed between the supply and return off the rooftop unit. As

individual zone dampers close, the bypass damper opens providing a path for the constant air to flow.

The rooftop system installed is a Trane Varitrac system. It is not a true variable air volume (VAV)

system, and is considered a low cost option to provide means of varying airflow and providing a level of

individual control. The system operates by all zone thermostats having a “vote” whether the system

should be in heating or cooling. As an example, if there are ten thermostats associated with a rooftop unit

and six call for heat, the rooftop unit will be in heat mode. The four spaces that voted for cooling will

close their damper as to not overheat the space, and wait for the system to switch to cooling. Varitrac

systems should be designed whereas all zones are similar in exposure, occupancy, and usage. The theory

is all zones would then be voting the same for heating or cooling.

Supply ductwork from the rooftop units is not insulated. There is no return ductwork and the above

ceiling space is considered a return air plenum. The plenum allows zone return air to flow back to the

rooftop unit. Supply ductwork within a conditioned space does not require insulation. There is the

position by some that the above ceiling plenum is the same temperature as the conditioned space, and thus

insulation is not required. ASHRAE requires insulation on ductwork where there is a 15 degree difference

between the supply and return. During cooling, the supply air temperature will be 55 degrees and the





J#630 020 00.00

L#60247/Page 2/March 9, 2018


space temperature is 75 degrees. Above ceiling could be as high as 80 degrees. The ductwork should be

insulated, as evident by the water stains on the ceiling tiles from condensation forming on the ductwork,

and subsequent dripping on the ceiling.

Stained Ceiling Typical Ceiling Supply Diffuser

There are two (2) gas fired furnaces located at the basement level that feed up and serve the first floor

Lobby. Both units are Trane units Model XE90 that provide either heating or cooling. Insulated ductwork

is installed from the unit and serves the Lobby via supply and return grilles installed in the floor. On the

day of our visit, there was carpet covering a couple of the grilles and both units were not working.

Furnace at First Floor Tag Information Supply Grille in Lobby Floor

There are fume hoods installed in the biology and chemistry science classrooms. Exhaust ductwork rises

up to roof mounted utility set exhaust fans. Typically, the exhaust ductwork on the discharge side of the

fan will extend to ten feet above the roofline. The exhaust air discharges at a high velocity, to get the

chemicals up into the air and dilute them. The reason is to prevent chemicals from discharging onto an

individual that may be servicing or standing near the fan. The systems are not installed properly and the

fan discharges low at the roof level.





J#630 020 00.00

L#60247/Page 3/March 9, 2018


Classroom Fume Hood Fume Hood Tag Info

Controls are located within electric closets at each floor. There are two control panels (one per rooftop) at

each floor, occurring at all three floors. It was stated there is a Building Management System in the

building, but the BMS system is not utilized.

There is a server room located behind the warming kitchen on first floor. The room was previously cooled

by a ductless cooling unit that is no longer operational. A portable MovinCOOL unit was installed in the

room and discharges the heat to the above ceiling plenum.

Abandoned Cond Unit Abandoned Ceiling DCU MovinCOOL Unit for Server

There is a center core with toilet rooms located on all three floors. The exhaust ductwork rises up to the

roof within a chase where it is exhausted through roof mounted exhaust fans.

There is no exhaust or cooling provided in the electric rooms where transformers are installed. There is an

opening in the wall that allows heat to flow into the above ceiling return plenum.





J#630 020 00.00

L#60247/Page 4/March 9, 2018



201 Forest Street

The building heating hot water boilers and chiller are located in a shed on the North East side of the

building. During our site visit, we did not have access to the building to inspect the mechanical

equipment. We understand there are two modular boilers installed providing 584 MBH of heat and two

chillers providing 90 tons of cooling to the building.

The heating system equates to approximately 15 BTU/SF which is low for an Educational facility. For

comparison, 199 Forest Street building has 6 rooftop units, each having 250 MBH heating capacity, for a

total of 1,500 MBH, equating to 37.5 BTU/SF.

The chiller cooling capacity of 90 tons is consistent with the requirements for an office building, but

appears low for an Educational facility.

Shed Housing Boilers/Chiller Piping Rising up from Tunnel Piping within Electrical Room

The heating hot water piping and chilled water piping is installed in a 4’ x 4’ tunnel located underground,

which runs from the shed to the building and rises up within an electrical room.

The building utilizes a 4 pipe system which provides both heating and cooling to fan coil units located in

all occupied spaces. It was stated that the system does not maintain cooling setpoint temperatures;

therefore, window air conditioners were added to supplement the cooling.

We understand the second floor could not maintain cooling temperature setpoint as well. There are

additional window air conditioners installed on the South West side.

There are cooling only furnaces installed in mechanical spaces located on mezzanines above second floor.

Supply and return distribution ductwork is installed at the ceiling of the second floor and serves rooms on

both sides. There are a total of (8) Rheem furnaces that provide cooling and ventilation to the Upper

Floor.





J#630 020 00.00

L#60247/Page 5/March 9, 2018


Fan Coil Unit Window Air Conditioners

The return air is accomplished through a grille installed between a room and the corridor. The corridor is

used a return air plenum for the air to get back to the furnaces. This is a code violation. In a fire event, the

corridor is your means of egress out of the building; code does not allow for an egress path to be used as a

plenum.

The mezzanine mechanical spaces where the Rheem furnaces are located are considered plenum rooms.

Return air is accomplished via a return fan that sits on the floor and discharges return air into the plenum

room. The outside air ductwork is connected between louvers located on the exterior wall and the return

ductwork back to the space. The amount of outside ventilation air is unknown, and not controllable. The

Rheem cooling only furnaces have a filter inlet on the unit that draws in the room plenum air. It is then

cooled by the unit and supplied to its respective zone.

The associated condensing units sit at grade level on the South West side of the building. All condensing

units located outside are manufactured by Rheem, model 13ACN60A01 and are 5 ton units, 13 SEER,

and utilize R410a refrigerant. The refrigerant lines run from the indoor furnaces outside along the

building exterior and drop down to its respective grade mounted condensing unit. The units were

manufactured in Feb 2014 making them four years old.





J#630 020 00.00

L#60247/Page 6/March 9, 2018


Condensing Units at Grade Refrigerant lines up to Indoor Units Condensing Units at Grade

Recommendations for 199 Forest St. Building:

The exact age of the rooftop units could not be determined. Rooftop units shall remain and be converted

from the Varitrac system to a true variable air volume (VAV) system. The outside air intake shall be

increased slightly to 25% and the system shall operate as a conventional VAV system.

This shall include:

• Remove bypass damper from supply ductwork to return on the Varitrac system

• Change motors to premium efficiency inverter driven motors and provide VFD’s

• Change all Varitrac dampers to conventional VAV’s with hot water reheat coils. Hot water will

be from new boilers installed in the Connector Building.

• Provide duct static pressure sensor and all controls to convert to VAV system

We understand this building would not be fully renovated and only minor renovations may occur in the

Cafeteria area. We recommend the systems be extended and/or modified and any ductwork necessary to

accommodate the renovated areas. All new and existing ductwork shall be insulated with code minimum

R-6 insulation.

In addition, the controls shall be upgraded and tied into new control system proposed for the Connector

work.

Furnaces in the first floor mechanical space shall be removed and replaced with like kind systems

Fume hood exhaust shall be improved so exhaust discharge is a minimum 10’ above roof line.





J#630 020 00.00

L#60247/Page 7/March 9, 2018


Recommendations for 201 Forest St. Building:

The 201 Forest St building should receive all new HVAC equipment. Existing systems are undersized.

The systems do not operate properly and the controls within the building do not function. In addition,

there are code related issues that need addressing.

• The ventilation provided in the building does not meet IMC code required ventilation rates.

• The corridor is used as a plenum.

• There are systems installed in rooms where one system is providing cooling and one system is

providing heating, which is a code violation.

In addition to the above, it appears the new Admin/Classroom building will be located where the existing

shed that houses the boiler and chiller is located. The mechanical room would be required to move.

Whereas the project goal is to provide a Admin/Class Building with connector between the buildings of

199 Forest and 201 Forest, we recommend the new systems installed be upsized to handle both 201 Forest

and the Admin/Classroom/connector building.

Refer to recommendation for connector building for new HVAC equipment that will serve 201 Forest.

Recommendations for New Connector, Existing 201 Forest, and the New Gym/Cafeteria Building:

Based on our observations and findings, we recommend the following HVAC system renovations and

improvements for the above referenced areas.

1. CODES

All work installed under Section 23 00 00 shall comply with the State of Massachusetts Building

Code and all local, county, and federal codes, laws, statutes, and authorities having jurisdiction.

2. DESIGN INTENT

The work of Section 23 00 00 shall consist of furnishing all materials, equipment, labor,

transportation, facilities, and all operations and adjustments required for the complete and

operating installation of the Heating, Ventilating and Air Conditioning work and all items

incidental thereto, including commissioning and testing.

3. BASIS OF DESIGN:

Massachusetts Code values are listed herein based on ASHRAE weather data tables:

Outside: Winter 7 deg. F, Summer 88 deg. F DB 74 deg. F WB

Inside: 70 deg. F +/- 2F for heating and 75 deg. F +/- 2F for (50% RH +/- 5%RH) for cooling.

Unoccupied temperature setback will be provided.





J#630 020 00.00

L#60247/Page 8/March 9, 2018


Ventilation: ASHRAE guide 62.1-2010 and IBC mechanical code (latest edition) will be met as a

minimum requirement for ventilation air.

Energy Efficiency: ASHRAE 90.1-2013 and IECC-2012 shall be met as a minimum.

4. SYSTEM DESCRIPTION – CONNECTOR BUILDING AND 201 FOREST

Variable Air Volume Overhead Dehumidifcation System

Heating for the entire building will be through the use of (2) gas-fired condensing boilers at

approximately 1,500,000 BTUH output each operating at a maximum supply water temperature

of 160°F. Boiler plant equipment shall be located in a new boiler room. The system will supply

hot water to all heating apparatus throughout the entire building through a two-pipe fiberglass

insulated schedule 40 black steel piping system. The supply water temperature will be adjusted

downward based on outside temperature to improve overall operating efficiency of the power

plant. Variable frequency controlled primary and standby floor mounted end suction pumps (270

GPM each) will be provided for overall water system distribution. Combustion air for each boiler

will be ducted directly to each boiler. Breeching from each boiler shall be through separate

double wall stainless steel design chimneys each discharging a minimum of 6 feet above the roof

level.

Classroom Rooftop Air Handling Unit (Dehumidification):

The primary mechanical ventilation system for the Classroom areas will include two (2) rooftop

air handling units of the 100% outside air design. One unit will serve 201 Forest and one unit

will serve the new classroom building. Each unit will be approximately 9,000 CFM. The units

will be comprised of a supply fan with VFD, gas fired furnace heating section with modulating

control, MERV 13 filtration, DX direct expansion cooling and dehumidification with hot gas

reheat control, exhaust air fan with VFD, and energy recovery wheel with VFD. Supply air

ventilation will be provided to ceiling mounted diffusers which will satisfy building code

ventilation air requirements at a discharge air temperature of 62 deg F – 68 deg. F (adj.) year-

round. Discharge air temperature of units shall be reset based upon outdoor air temperature and

humidity conditions.

Classroom Ventilation:

Each classroom shall be provided with a variable volume (VAV) terminal box with combination

temperature, humidity, and CO2 sensor controls and shall be interlocked with occupancy sensors

that will reduce outside air as allowed maintaining a maximum of 800 PPM while providing

sufficient ventilation to the diffusers to meet the required heating or cooling load of the

classroom. As VAV boxes modulate, the supply and return air fans associated Variable





J#630 020 00.00

L#60247/Page 9/March 9, 2018


Frequency Drives (VFD) of the rooftop units will adjust the fan speed based on system static

pressure, reducing the energy consumed by the fans.

Classroom Heating:

It is proposed that a continuous length of ceiling radiant heating panels will be installed along the

entire length of the exterior wall in each classroom. The radiant panel heating in each classroom

will be controlled by a space mounted thermostat to maintain overall space temperature control.

Administration (Full Air-conditioning):

The primary mechanical ventilation system for the Administration and Media Center areas will

include one (1) rooftop air handling unit of the 100% outside air design. The unit will be

approximately 4,000 CFM. The unit will be comprised of supply fan with VFD, gas fired furnace

heating section with modulating control, MERV 13 filtration, DX direct expansion cooling and

dehumidification with hot gas reheat control, exhaust air fan with VFD, and energy recovery

wheel with VFD. Supply air ventilation will be provided to ceiling mounted diffusers which will

satisfy building code ventilation air requirements at a discharge air temperature of 55-65 deg. F

(adj.) year-round. Discharge air temperature of units shall be reset based upon outdoor air

temperature and humidity conditions. Variable air volume boxes shall modulate air volume to

maintain space set point temperatures.

Administration Heating:

It is proposed that a continuous length of ceiling radiant heating panel will be installed along the

entire length of the exterior wall in each space. The radiant panel heating in each space will be

controlled by a space-mounted thermostat to maintain overall space temperature control.

Gymnasium (Dehumidification):

The gymnasium will be provided with heating, ventilation and air conditioning by one rooftop air

handling unit of the recirculation design with capability of providing 100% outside air when

economizer controls allow. Unit location will have to be reviewed; possible location at grade

behind building. The unit will be approximately 10,000 CFM and will include a supply fan with

VFD, gas fired furnace heating section with modulating control, MERV 13 filtration, DX direct

expansion cooling and dehumidification with hot gas reheat control, exhaust air fan with VFD,

energy recovery wheel with VFD, and demand ventilation controls.





J#630 020 00.00

L#60247/Page 10/March 9, 2018


Supply air will be provided to the space through galvanized steel metal ductwork installed at the

ceiling. Return air will be drawn back to the unit through a galvanized sheet metal ductwork

terminating with low wall return air. In addition, carbon dioxide (CO2) controls will be installed

which will monitor the overall level of carbon dioxide at a threshold level of 800 ppm. As levels

drop generally relating to a reduction in population, the air handling unit outside air damper will

modulate to reduce air flow and ventilation while always maintaining a maximum of 800 ppm.

Gymnasium Heating:

It is proposed that a continuous length of fin tube radiation or radiation heating panels will be

installed along the entire length of the exterior walls. The fin tube radiation will be controlled by

a space mounted thermostat to maintain overall space temperature control.

Cafeteria (Dehumidification):

The primary mechanical ventilation system for the Cafeteria/Servery will include one (1) rooftop

air handling unit of the 100% outside air design. The unit will be approximately 7,500 CFM.

The unit will be comprised of supply fan with VFD, gas fired furnace heating section with

modulating control, MERV 13 filtration, DX direct expansion cooling and dehumidification with

hot gas reheat control, exhaust air fan with VFD, and energy recovery wheel with VFD. Supply

air ventilation will be provided to ceiling mounted diffusers which will satisfy building code

ventilation air requirements at a discharge air temperature of 62 deg F – 68 deg. F (adj.) year-

round. Discharge air temperature of units shall be reset based upon outdoor air temperature and

humidity conditions.

Supply air will be provided to the space through galvanized steel metal ductwork terminating

with ceiling mounted diffusers. Return air will be drawn back to the unit through a galvanized

sheet metal ductwork terminating with ceiling mounted return air. In addition, carbon dioxide

(CO2) controls will be installed which will monitor the overall level of carbon dioxide at a

threshold level of 800 ppm. As levels drop generally relating to a reduction in population, the air

handling unit outside air damper will modulate to reduce air flow and ventilation while always

maintaining a maximum of 800 ppm.

Cafeteria Heating:

It is proposed that a continuous length of fin tube radiation will be installed along the entire

length of the exterior walls. The fin tube radiation will be controlled by a space mounted

thermostat to maintain overall space temperature control.





J#630 020 00.00

L#60247/Page 11/March 9, 2018


Exhaust Systems:

New rooftop exhaust air fan systems should be provided for Science Room fume hoods. Fans

shall be manufactured by Greenheck, model Vektor-H, estimate 600 CFM.

Supplemental AC Systems:

New ductless split system AC units should be provided for new IT Rooms.

Control Systems:

We recommend that the existing Control System is replaced in its entirety and that a new DDC

(direct digital control) Automatic Temperature Control (ATC) and Building Energy Management

(BMS) System is installed to control the new and existing HVAC Systems. The new ATC/BMS

System should be a web-accessible, open protocol BACNet System.

5. TESTING, ADJUSTING, BALANCING & COMMISSIONING:

All new and existing HVAC systems shall be tested, adjusted, balanced and commissioned as part

of the project scope.

6. OPERATION MANUALS AND MAINTENANCE MANUALS: When the project is

completed, the Mechanical Contractor shall provide operation and maintenance manuals to the

Owner.

7. RECORD DRAWINGS AND CONTROL DOCUMENTS: When the project is completed, an

as-built set of drawings, showing all Mechanical system requirements from contract and

addendum items will be provided to the Owner.


2.7 Fire Protection





Fire Protection Existing Conditions Systems Report

J#630 020 00.00

L#60688/Page 1/April 5, 2018


Fire Protection Existing Conditions Report:

165 Forest Street

Executive Summary:

The building is protected by automatic sprinkler systems, the building is fully sprinklered. There is a six-

inch fire service, full size double check valve assembly, the OS&Y valves are not provided with tamper

switches or locks on the valves, four-inch alarm check valve, single flow switch. There is one four-inch

standpipe with two and half inch fire department valves. Each floor is provided with a single valve, the

valve is not provided with tamper switch or lock. The building had water damage due to malfunction in

the sprinkler heads. It appears on the third and fourth floors that the floor control valve has been closed.

Massachusetts code requires that any new building or substantially renovated building, 12,000 square feet

or more must be sprinklered. Per 780 CMR 34.00 work shall not be considered a substantial renovation if

the cost of installing a sprinkler system exceeds 15% of the total renovation cost. Should the existing

building undergo a major renovation the building will require upgrades to the existing sprinkler system to

provide complete protection of all spaces.


The six-inch fire service enters the building in the Fire/Plumbing room. The six-inch service reduces to

four-inch, four-inch wet alarm check valve, pressure gauge reading at 90 PSI.

The double check valve and the OS&Y are not provided with tamper switches.

The building is provided with one free standing fire department connection, four by two by two and half

connections.

Four-inch combination sprinkler/standpipe. There were old recessed fire hose valve cabinets. The hoses

have been removed and the valves remain but should be plugged. The standpipe also has a two and half

inch fire department valve located on the standpipe.

There is two-inch sprinkler main from the standpipe on each floor. The sprinkler zone is provided with

two-inch OS&Y valve (no tamper switch), the sprinkler zone is not provided with a flow switch. There is

a sprinkler test station with ball valves and sight glass to one-inch drain riser.

The floors are fully sprinkled with drop sprinklers, concealed type.

The ceilings on the Third floor and part of the Fourth floor have been removed and the pendent sprinkler

system left in place. The sprinklers will not operate, the system needs to be provided with up-right heads.





J#630 020 00.00

L#60688/Page 2/April 5, 2018

Fire Service & Alarm Check Valve Double Check Valve

Typical Concealed Sprinkler Head Fire Department Connection

Typical Standpipe Typical Sprinkler Layout on Upper Floors

Recommendations:

• Replace the existing four-inch alarm check valve.

• Provide tamper switches on existing double check valve assembly.





J#630 020 00.00

L#60688/Page 3/April 5, 2018

• Replace the fire department connection with Storz connection and electric alarm bell.

• Replace the existing four-inch standpipe with new six-inch combination standpipe / sprinkler

riser.

• Provide new sprinkler zone control stations per floor.

• Replace all building sprinklers and branch piping.





J#630 020 00.00

L#60245/Page 1/March 9, 2018


Fire Protection Existing Conditions Report

199 Forest Street


In general, the building is fully protected with an automatic sprinkler system. System is original to the

building construction in 1992.

The fire service enters a Classroom Closet. The fire service is 6-inch in size and reduces to 4-inch above

slab. The fire service is controlled by an exterior post indicator valve.

The main double check valve assembly is located in the center of the building near the lobby. The double

check valve is 4-inch and includes a 4-inch riser check valve and main flow switch.

Fire department connection is a 4” x 2-1/2” x 2-1/2” Siamese connection. An electric bell is mounted

above the connection.

There are no standpipes in the stairwells.

Distribution and branch piping is black steel pipe with either grooved coupling or threaded fittings

depending on pipe sizes. Piping appears to be in good condition.

Sprinklers are recessed pendent type, quick response, in ceiling areas. In exposed, non-ceiling areas,

sprinklers are upright brass.

Fire Service Entrance Post Indicator Valve Double Check Valve Assembly





J#630 020 00.00

L#60245/Page 2/March 9, 2018

Fire Department Connection Typical Semi-Recessed Sprinkler

Fire Protection Existing Conditions Report

201 Forest Street


In general, the building is fully protected with an automatic sprinkler system. System appears to be

original to the building construction in 1980.

The fire service enters the Health Classroom Closet. The fire service is 8-inch in size and reduces to 4-

inch above slab. The main double check valve assembly is located in the closet. The double check valve

is 4-inch and includes a 4-inch alarm check valve and main flow switch.

The fire service is controlled by an exterior post indicator valve.

Fire department connection is a 4” x 2-1/2” x 2-1/2” Siamese connection. An electric bell is mounted

above the connection.

There are no standpipes in the stairwells.

Distribution and branch piping is black steel pipe with either grooved coupling or threaded fittings

depending on pipe sizes. Piping appears to be in good condition.

Sprinklers are pendent type, standard response, in ceiling areas. In exposed, non-ceiling areas, sprinklers

are upright brass, standard response.





J#630 020 00.00

L#60245/Page 3/March 9, 2018

Fire Service Entrance Fire Department Connection Typ. Pendent Sprinkler

Semi-Recessed Pendent Sprinkler Upright Sprinkler

Recommendations:

Based on our observations and findings, we recommend the following system renovations and

improvements for the building.

1. CODES

A. All work installed under Section 210000 shall comply with the MA Building Code and

all state, county, and federal codes, laws, statutes, and authorities having jurisdiction.





J#630 020 00.00

L#60245/Page 4/March 9, 2018

2. DESIGN INTENT

A. All work is new and consists of furnishing all materials, equipment, labor, transportation,

facilities, and all operations and adjustments required for the complete and operating

installation of the Fire Protection work and all items incidental thereto, including

commissioning and testing.

3. DESCRIPTION

A. Existing systems shall remain and be modified to protect the renovated areas in the

existing building. Existing sprinkler zone control valve assemblies shall remain.

B. A new 6” double check valve and fire distribution main will be provided in building 199

to supply the building additions.

C. A dry alarm valve shall be provided to protect the parking areas below the addition.

D. All new sprinkler heads in the existing building and new additions will be quick

response, pendent in hung ceiling areas and upright in unfinished areas.

4. BASIS OF DESIGN

A. The science classrooms, mechanical rooms, storage rooms, and vehicle parking areas are

considered Ordinary Hazard Group 1. All other areas are considered light hazard.

B. Required Design Densities:

Light Hazard Areas = 0.10 GPM over 1,500 s.f.

Ordinary Hazard Group 1 = 0.15 GPM over 1,500 s.f.

C. Sprinkler spacing (max.):

Light Hazard Areas = 225 s.f.

Ordinary Hazard Areas = 130 s.f.

5. PIPING

A. New wet system sprinkler piping 1-1/2 in. and smaller shall be ASTM A-53, Schedule 40

black steel pipe. Sprinkler/standpipe piping 2 in. and larger shall be ASTM A-135,

Schedule 10 black steel pipe.

B. New dry system sprinkler piping shall be ASTM A-53, Schedule 40 galvanized steel

pipe.





J#630 020 00.00

L#60245/Page 5/March 9, 2018

6. FITTINGS

A. Fittings on new service piping, 2 in. and larger, shall be Victaulic Fire Lock Ductile Iron

Fittings conforming to ASTM A-536 with integral grooved shoulder and back stop lugs

and grooved ends for use with Style 009-EZ or Style 005 couplings. Branch line fittings

shall be welded or shall be Victaulic 920/920N Mechanical Tees. Schedule 10 pipe shall

be roll grooved. Schedule 40 pipe, where used with mechanical couplings, shall be roll

grooved and shall be threaded where used with screwed fittings. Fittings for threaded

piping shall be malleable iron screwed sprinkler fittings.

B. Fittings on dry systems shall be galvanized.

7. JOINTS

A. Threaded pipe joints on new piping shall have an approved thread compound applied on

male threads only. Teflon tape shall be used for threads on sprinkler heads. Joints on

piping, 2 in. and larger, shall be made up with Victaulic, or equal, Fire Lock Style 005,

rigid coupling of ductile iron and pressure responsive gasket system for wet sprinkler

system as recommended by manufacturer.

B. Joints on dry system shall be galvanized.

8. DOUBLE CHECK VALVE ASSEMBLY

A. New double check valve assembly in building 199 shall be MA State approved,

U.L./F.M. approved, with iron body bronze mounted construction complete with

supervised OS & Y gate valves and test cocks. Furnish two spare sets of gaskets and

repair kits.

B. Double check valve detector assembly shall be of one of the following:

1. Watts Series 757-OSY

2. Wilkins 350A-OSY

3. Conbraco Series 4S-100

4. Or equal

Memorandum

Date 5 April 2018

Project / No. AMSA Charter School / A17054

To Lisa O’Connor and Eric Lane

From Larry Spang and Meryl Nistler

Subject Fire protection at existing 165 Forest Street, Marlborough, MA

Eric and Lisa,

During our walk through of 165 Forest Street on March 29th, 2018, there was mention that the existing building may have recalled sprinkler heads that have not been corrected. As you know, we are in the process of preparing a report to address the entire building; we feel it necessary to bring this situation to your attention since it is an occupied building.

While on site, Eric L. commented that the sprinkler heads were reportedly recalled. We have reviewed this condition with our Fire Protection engineer from GGD, but he is unable to verify whether the sprinkler heads have been recalled or are operating correctly. As such, we suggest that all sprinkler system heads be inspected by a certified fire protection contractor and replaced as necessary.

We also note that the sprinkler heads on the 3rd and 4th floor do not meet code as currently installed. The existing sprinkler heads are down turned and intended to be installed in a suspended ceiling. Since the ceiling has been removed in all of the 3rd floor and large areas of the 4th floor, those down turned sprinkler heads should be replaced with upright heads until such time as a new ceiling is installed.

Additionally, our plumbing engineers observed that the existing valves on the sprinkler system are an older system. With this system, it appears that the lower the handle, the more this valve stem is open to allow water to flow. We recommend the valve stems be checked by a certified fire protection contractor to confirm there is appropriate water flow to the upper floors in their entirety. All valves should also have tamper proof security switches or locks to prevent inadvertent shut down.

Lastly, there were horn strobes observed on the upper floors, but no smoke/ heat detectors. This is acceptable by code if the sprinkler system is operational. If the sprinkler system is not functioning, then smoke/ heat detectors need to be installed.

Please let us know if you have any questions or would like further information. Otherwise, we are proceeding with our report on the overall condition of the building.


2.8 Electrical





Electrical Existing Conditions Systems Report

J#630 020 00.00

L#60682/Page 1/April 5, 2018


Electrical Existing Conditions Report:

165 Forest Street

Executive Summary:

The building was constructed in 1983. The Electrical systems have received some upgrades however most

are of original vintage, and although functioning, have outlived their intended useful life. In general, the

building’s electrical service capacity is adequate for an educational use; the systems condition range from

fair to poor condition. The switchboard and panelboards are in poor condition and should be replaced. The

life safety systems were in compliance when installed, but due to code changes, are no longer in compliance

with current codes. The Fire Alarm System will need to be replaced with an addressable, voice evacuation

system.

Electrical Distribution System:

The primary and secondary services run underground. The building is fed from a utility company pad

mounted transformer. The service is rated at 1,200 Amperes, 277/480, Volt, 3 Phase, 4 Wire. The main

switchboard has (2) 600 Amp main fusible switches; main switch north and main switch south. Each main

switch feeds a (6) meter bank with (6) 200 ampere breakers except Omnipoint which is fed with a 100

ampere breaker. One of the (12) meters serves the house loads. Two additional 200 ampere meters have

been added to feed the third and fourth floor tenants “Egenera” which both floors are now vacant. The

switchboard and panelboards were manufactured by GTE Sylvania.

The building was built as a spec office building originally with (12) meters. Two (2) meters were

subsequently added. The switchboard is currently unmetered.

Pad Mounted Transformer Main Switchboard House & Tenant Panelboards Remote Meters “Egenera”

The house panels are located in the Main Electric Room. Tenant panels are located in Electric Closets at

each floor, north and south. The Electric Closets are not sprinklered, not rated and do not have a smoke

detector. The closets are open to the plenum. The panel for the cell tower tenant, Omnipoint, is located on

the roof.





J#630 020 00.00

L#60682/Page 2/April 5, 2018

Some panels have switch plates as filler covers. Transformers are located underneath panels, this condition

does not meet today’s codes.

Other panel manufacturer’s were noted including Federal Pacific. The third and fourth floor panels have

had the branch circuits removed as floors are vacant and gutted.

The switchboard and panelboards are original to building and are generally in poor condition.

The switchboard, panelboards, and transformers should be replaced under a renovation program.

Panel with Switchplates Panel w/Transformer Underneath Federal Pacific Panel Panels within Renovation Spaces

Lighting System:

Typical corridor lighting consists of 2 x 4 recessed parabolic fixtures with T8 lamps as well as recessed

down lights with compact fluorescent lamps. The Lobby has recessed downlights with HID bulbs on the

two-story space and screw-in LED bulbs in the single-story space. Lights are typically controlled with local

switches. There are no occupancy sensors. Stair lights consist of wall mounted fixtures with integral

sensors. Toilet rooms have recessed downlights.

The facility does not have an automated lighting control system.

Lobby HID Down Lights Corridor Lighting Corridor Lighting





J#630 020 00.00

L#60682/Page 3/April 5, 2018

Toilet Recessed Lights Stair Light Fixtures

Exterior Lighting:

Parking lot lighting consists of pole mounted shoebox type fixtures with HID horizontal lamps. HID wall

packs exist on the building perimeter. HID wall mounted flood type fixtures exist high on building

perimeter. There are no lights located at exit discharge doors. The wall packs and floods are not dark sky

compliant. The exterior lights are controlled with photocell “On” and timeclock “Off”.

HID Flood Pole Mounted HID Fixtures HID Wall Packs

Emergency Lighting System:

The facility does not have a generator. Emergency lighting consists of emergency battery units. Most spaces

do appear to comply with code in respect to the placement of battery units. Exit signs are of the self-

contained type, some with battery back-up. It appears emergency lighting and exit signs are well maintained

in occupied areas. There is no emergency lighting on the exterior of Exit discharge doors. All exit signs are

required to have battery backup.





J#630 020 00.00

L#60682/Page 4/April 5, 2018

Emergency Battery Units Exit Sign

Fire Alarm System:

The fire alarm system consists of a (12) zone control panel with (8) zones active, located in the Electric

Room. The fire alarm system is not code compliant for educational use group, nor is the placement of

devices compliant with NFPA-72. Educational use groups require a voice evacuation type system. The

system installed is an FCI panel with horn strobes for notification appliances. Egress ways do not have

coverage of smoke detectors. The system is obsolete. The system was compliant with code when installed

but due to code changes it is no longer compliant with current codes.

The form of alarm transmission is via a Silent Knight digital dialer to a remote central station.

The sprinkler flow switch is supervised. Gate valves do not have tamper switches.

Fire Alarm Control Panel Digital Dialer & Power Supplies Pull Station & Horn/Strobe





J#630 020 00.00

L#60682/Page 5/April 5, 2018

Communications/Security/Miscellaneous:

Fiber, Telephone, and Cable TV enter the building underground into the Electric Room. The building is

interconnected with fiber with adjacent 199 and 201.

The Closed-Circuit TV, CCTV System consists of (2) exterior and (3) interior cameras connected to a

DVR.

The elevator does not appear to be interlocked with fire alarm system for recall.

The facility does not have a Lightning Protection System.

The facility does not have a Bi-Directional Antenna System used to enhance communications with portable

radios by First Responders.

The facility does not have a Two-Way Communications System at the elevator landings.

The general wiring method is pipe and wire., BX/MC Cable and low energy cable for fire alarm.

The Omnipoint cell tower tenant feeder conduit and communications conduit run exposed within stairwell.

This condition would not be allowed by code today.

Recommendations for 165 Forest Street Building:

Based on our observations and findings, we recommend the following Electrical system renovations and


1. CODES

A. All work installed under Section 260000 shall comply with the Massachusetts State

Building Code and all local, county, and federal codes, laws, statutes, and authorities


2. DESIGN INTENT

A. The work of Section 260000 is as described in this Narrative. All work is new and consists

of furnishing all materials, equipment, labor, transportation, facilities, and all operations

and adjustments required for the complete and operating installation of the Electrical work

and all items incidental thereto, including commissioning and testing.





J#630 020 00.00

L#60682/Page 6/April 5, 2018

3. SYSTEM DESCRIPTION


The existing switchgear is in poor condition and should be replaced. The existing primary service,

existing pad mounted transformer, and existing secondary service could be reused.

Lighting:

New LED energy efficient lighting with controls that comply with the energy code should be

provided in new and renovated areas. A new automated lighting control system will be provided.

New emergency lighting consisting of integral battery units within the light fixtures will be

provided in new and renovated areas.

LED exit signs with integral battery backup will be provided.

Fire Alarm System:

The existing fire alarm system does not comply with code and would require full replacement with

a new addressable system with voice evacuation.

Speaker/strobe devices are required in classrooms, corridors, and assembly spaces. Strobe lights are

required in Toilet and Conference Rooms. Smoke detectors will be provided in egress corridors and

stairwells.

4. TESTING REQUIREMENTS

A. The Electrical Contractor shall provide testing of the following systems with the Owner

and Owner’s Representative present:

• Lighting and power panels for correct phase balance.

• Lighting control system (interior and exterior).

• Fire alarm system.

B. Testing reports shall be submitted to the Engineer for review and approval before providing

to the Owner.

5. OPERATION MANUALS AND MAINTENANCE MANUALS

A. When the project is complete, the Electrical Contractor shall provide operation and

maintenance manuals to the Owner.





J#630 020 00.00

L#60682/Page 7/April 5, 2018

6. RECORD DRAWINGS AND CONTROL DOCUMENTS

A. When the project is complete, an as-built set of drawings, showing all lighting and power

requirements from contract and addendum items, will be provided to the Owner.

7. COMMISSIONING

A. The project shall be commissioned per Commissioning Section of the specifications.





J#630 020 00.00

L#60243/Page 1/March 9, 2018



199 Forest Street

Executive Summary:

The building was constructed in 1992. The Electrical systems appear to be of original vintage. In general,

the building’s electrical service capacity is adequate for an educational use; the systems condition range

from fair to good condition. The life safety systems were in compliance when installed, but due to code

changes, are no longer in compliance with current codes. The Fire Alarm System will need to be replaced.



mounted transformer. The service is rated at 1,200 Amperes, 277/480 Volt, 3 Phase, 4 Wire. The main

switchboard has a 1,000 Amp main breaker, the switchboard and panelboards were manufactured by Cutler-

Hammer.

The building currently has two main disconnects, a 1,000 Amp main disconnect for Tenants, and a 200

Amp main disconnect for the house loads. The building was built as a spec office building with (1) Owner’s

meter and (7) separate Tenant meters. The switchboard is currently unmetered. The switchboard has (7)

200A breakers feeding (7) Tenant meters which in turn feed (7) remote panels. The switchboard has space

provisions for (5) additional 200 Amp breakers.

Main Switchboard Tenant Meters Tenant and House Remote Panelboards &

Meter & Panelboards Transformers





J#630 020 00.00

L#60243/Page 2/March 9, 2018

Interior Lighting System:

Typical classroom, corridor and cafeteria lighting consists of 2x4 recessed parabolic fixtures with (3) T8

lamps. The Lobby has recessed downlights. Typical classroom lights are controlled with (1) switch. There

are no occupancy sensors. Stair lights consist of wall mounted fixtures with integral sensors.

Cafeteria Lighting Corridor Lighting Prep Room Lights Stair Light Fixtures

Exterior Lighting:

Parking lot lighting consists of pole mounted shoebox type fixtures with

HID horizontal lamps. HID wall packs exist on the building perimeter.

There are no lights located at exit discharge doors. The rear parking lot

poles are connected to building199 while the front parking lot lights are

connected to building 201. The pole fixtures are dark sky compliant however the

wall packs are not.

Pole Mounted HID Fixtures Emergency Lighting System:

Emergency lighting consists of emergency battery units. Most spaces do appear to comply with code in

respect to the placement of battery units. Exit signs are of the self-contained type. It appears emergency

lighting and exit signs are well maintained in occupied areas. There is no emergency lighting on the exterior

of Exit discharge doors.





J#630 020 00.00

L#60243/Page 3/March 9, 2018

Battery Units Over Stair Battery Units in Hallways Exit Sign

Fire Alarm System:

The fire alarm system consists of a (12) zone control panel with (8) zones used, located in the Electric

Room. The fire alarm system is not code compliant for educational use group, nor is the placement of

devices compliant with NFPA-72. Educational use groups require a voice evacuation type system. The

system installed is an FCI panel with horn strobes for notification appliances. Egress ways do not have full

coverage of smoke detectors. The system is obsolete. The system was compliant with code when installed

but due to code changes it is no longer compliant.

The form of alarm transmission is via a digital dialer to a remote central station. The existing King Fisher

radio box is non-functional.

Fire Alarm Control Panel Wireless Transmitter Horn/Strobe





J#630 020 00.00

L#60243/Page 4/March 9, 2018


201 Forest Street

Executive Summary:

The building was constructed in 1980. The Electrical systems have received some upgrades however most

are of original vintage. In general, the building’s electrical service capacity is adequate for an educational

use; the systems condition range from fair to poor condition. The switchboard and panelboards are in poor

condition and should be replaced. The life safety systems were in compliance when installed, but due to

code changes, are no longer in compliance with current codes. The Fire Alarm System will need to be

replaced. The generator is inadequate and is not code compliant for life safety systems.



mounted transformer. The (3) 4” secondary conduit LB’s are exposed on exterior wall. The service is rated

at 1,200 Amperes, 120/208, Volt, 3 Phase, 4 Wire. The main switchboard has a 1200 Amp main fusible

switch as well as fusible branch disconnect switches. The switchboard and panelboards were manufactured

by Westinghouse. The adjacent Mechanical building currently has a separate main disconnect with a

separate meter

. The building was built as a spec office building with (1) Owner’s meter and (7) separate Tenant meters.

The switchboard is currently unmetered. The switchboard feeds (7) Tenant meters which in turn feed (7)

local as well as remote panels. Panels are generally full. The switchboard has space provisions for

additional branches. The switchboard and panelboards are in poor condition and should be replaced under a

renovation.

Pad Mounted Transformer Main Switchboard Tenant Meters & Panelboards





J#630 020 00.00

L#60243/Page 5/March 9, 2018

Separate Mech. Bldg, Meter Remote Panel Secondary LB’s Above Grade

Lighting System:

Typical classroom, corridor and cafeteria lighting consist of track fixtures as well as linear fluorescent

fixtures with T8 lamps. The Lobby has recessed downlights with screw-in LED bulbs. Lights are typically

controlled with local switches. There are no occupancy sensors. Stair lights consist of wall mounted fixtures

with integral sensors. The pantry kitchen has recessed downlights without lenses over counters.

The school does not have an automated lighting control system.

Hallway Lighting Cafeteria Lighting Corridor Lighting

Pantry Kitchen Recessed Lights Stair Light Fixtures





J#630 020 00.00

L#60243/Page 6/March 9, 2018

Exterior Lighting:

Parking lot lighting consists of pole mounted shoebox type fixtures with HID

horizontal lamps and integral photocells. HID wall packs exist on the building

perimeter. There are no lights located at exit discharge doors. The wall packs

are not dark sky compliant.

Emergency Lighting System: HID Wall Packs

The facility has a diesel generator located in the Mechanical building. The generator is not code compliant

for life safety systems. There is a 275 gallon single wall residential fuel tank within an adjacent wooden

shed that fuels the generator. The shed has no power or lighting. The emergency panel is located in the

Main Electric Room. Emergency lighting consists of emergency battery units. Most spaces do appear to

comply with code in respect to the placement of battery units. Exit signs are of the self-contained type. It

appears emergency lighting and exit signs are well maintained in occupied areas. There is no emergency

lighting on the exterior of Exit discharge doors.

Generator Fuel Tank Emergency Panel

Fire Alarm System:

The fire alarm system consists of a newly installed addressable Fire-Lite MS-92000DLS control panel

located in the Electric Room. Although the newly installed panel is addressable, the existing non-

addressable devices and wiring were reused and connected to the new panel. Monitor modules were used to

pick up existing zones. The fire alarm system is not code compliant for educational use group, nor is the

placement of devices compliant with NFPA-72. Educational use groups require a voice evacuation type

system.





J#630 020 00.00

L#60243/Page 7/March 9, 2018

The system installed uses horn strobes for notification appliances. Egress ways have smoke detectors but

spacing exceeds NFPA-72. The system is obsolete. The system was compliant with code when installed but

due to code changes it is no longer compliant.

A Fire-Lite LCD remote annunciator is located in the main vestibule. The form of alarm transmission is via

a digital dialer to a remote central station.

Fire Alarm Control Panel Remote Annunciator Horn/Strobe Pull Station & Horn/Strobe




1. CODES

A. All work installed under Section 260000 shall comply with the Massachusetts State



2. DESIGN INTENT

A. The work of Section 260000 is as described in this Narrative. All work is new and consists








J#630 020 00.00

L#60243/Page 8/March 9, 2018



The existing switchgear is in good condition and may be reused. The existing primary service will

need to be removed to allow construction of a new connector. One new electrical service will be

provided for the entire facility consisting of a new primary service, new pad mounted transformer,

new secondary service and new switchboard. The existing switchgear will be back fed from the

new switchboard.

Lighting:

New LED energy efficient lighting with controls that comply with the energy code are to be




The exterior lighting will be replaced with LED sources.

Fire Alarm System:





stairwells.




• Switchboard, lighting, and power panels for correct phase balance.



• Emergency lighting.


to the Owner.





J#630 020 00.00

L#60243/Page 9/March 9, 2018







7. COMMISSIONING





1. CODES

B. All work installed under Section 260000 shall comply with the Massachusetts State



2. DESIGN INTENT

B. The work of Section 260000 is as described in this Narrative. All work is new and consists






The existing switchgear is in poor condition and should be replaced. The existing service will need

to be removed to allow construction of a new connector. One new electrical service will be

provided for the entire facility consisting of a new primary service, new pad mounted transformer,

new secondary service and new switchboard. The existing building as well as the new addition will

be fed from the new switchboard and new panelboards.

The entire facility will be on one master meter.





J#630 020 00.00

L#60243/Page 10/March 9, 2018

Lighting:

New LED energy efficient lighting with controls that comply with the energy code are to be




Fire Alarm System:





stairwells.




• Lighting and power panels for correct phase balance.




to the Owner.







11. COMMISSIONING



2.9 Structural (165 Forest Street only)


April 6, 2018 Via E-Mail: [email protected] Ms. Meryl Nistler Arrowstreet 10 Post Office Square, Suite 700N Boston, MA 02109 RE: 165 Forest Street – Marlborough, Massachusetts AMSA – Structural Evaluation Mc/Sal Project N0 12134.001 Dear Meryl, At your request, McNamara • Salvia visited the existing building at 165 Forest Street in Marlborough, Massachusetts on March 29, 2018. The purpose of this visit was to observe the existing conditions and to provide a structural assessment of the building which AMSA may purchase. McNamara • Salvia had previously visited the building in 2012 to observe reported floor vibrations when the school children exited the classrooms into the corridor. Follow-up on this issue and observation of the existing structure, where visible, was also part of this current scope of work. Existing Conditions The existing building is a four-story, steel-framed office building. The floor system is generally 16” deep open-web steel joists (bar joists) at approximately 24” on-center supporting a 3” deep concrete slab-on-form deck. The typical structural bay is 27’-0” x 27’-0”. The bar joists are supported by wide flange steel beams of varying size depending on the span, but typically 21” to 24” deep (W21 or W24). The building was constructed around 1982. Though not directly confirmed visually, the lateral force resisting system appears to be steel braced frames and possibly reinforced masonry shear walls at the core. Per a letter dated September 19, 2012, from Cowen Associates, the Structural Engineer of Record for the building, the floors were designed for a uniform live load of 50 lbs. per square foot (psf) and a uniform partition load of 20 psf (70 psf total floor load). These design loads were the minimum design loads for an Office Building and are generally consistent with the minimum design loads in current Building Codes for an Office Building. Observations The building structure generally appears to be in good condition. There were no obvious visible signs of distress. The floor vibration on the Second Floor was perceptible to the observer when the students entered the corridor,

Arrowstreet

April 6, 2018

Page 2 of 4

confirming earlier reports and observations. The existing bar joist floor structure is a very common structural system for suburban office buildings of this type. While compliant for the structural loads for the original Use group occupancy, the floor system is a relatively light structural system. When the floor is loaded with office (or school) furniture and finishes, those components help to dampen floor vibrations. When there is a wide open structural bay with few or no objects of substantial weight, floor vibrations may be much more perceptible when subjected to people walking. An analysis of the existing floor system was conducted to determine its adequacy to support the Code-prescribed loads for School Use on all levels. The Code-prescribed uniform live load for a school is 40 psf in classrooms and 80 psf in corridors, excluding First Floor corridors which are to be designed for 100 psf. As noted in our letter dated September 26, 2012, given that the school entrance is currently on the Second Floor, it is our opinion that the Second Floor corridors should be considered as First Floor corridors for the purpose of Code loading. For the structural bays where a standard-width corridor and a classroom occupy the bay, the existing floor structure has sufficient capacity to support the load of 40 psf in the classroom and 80 psf (or 100 psf) in the corridor area. For the large triangular “breakout” areas that occupy most or all of an entire structural bay, which from a structural standpoint are considered large corridors, the existing bar joists do not have capacity to support the corridor loading over the entire bay. As noted above, there appears to be a defined lateral force resisting system in the building, though it is not readily visible in the current configuration of the interior space. In 1982, when the building was constructed, the Massachusetts State Building Code in effect at the time would have required lateral resistance for both wind and seismic forces. Therefore, it is reasonable to conclude that the building does have a defined lateral force resisting system. If the building is modified to a School Use throughout, without altering the existing structure, no upgrade to the lateral force resisting system will be required. Recommendations The areas of floor that will be primarily corridor should be reinforced with new steel beams to supplement the existing bar joists. Adding these beams will also stiffen the existing floor system to reduce the perceptible floor vibration under foot traffic. A schematic reinforcing concept is shown in Figure 1 on the following page.

Arrowstreet

April 6, 2018

Page 3 of 4

Figure 1 – Typical Existing Bay Framing

with Proposed Reinforcing

The reinforcing concept is to add new WF beams at approximately quarter points of the bay and then span steel angles between the beams. The steel angles will be tack-welded to the underside of the top chord of each joist. This will allow the joists to share load with the new beams. For budgeting purposes, the new steel can be estimated at 2-tons-per-bay requiring reinforcing. This reinforcing scheme could also be applied where the floor loading capacity is sufficient but the vibration performance is not acceptable to the user. Should this be desired, we recommend a more detailed vibration analysis with field measurement and advanced structural modeling be utilized to optimize the reinforcing. Figure 2 shows the anticipated areas of required and optional reinforcing on the typical level. Assuming one (1) full bay and two (2) half-bays per level, the reinforcing steel estimate would be 4 tons per floor.

Arrowstreet

April 6, 2018

Page 4 of 4

Figure 2 – Structural Bays to be Reinforced

We trust that this report meets your needs. Please feel free to contact us if you have any further questions or concerns. Very truly yours, McNamara • Salvia Rachel M. Gerhart Project Engineer Mark F. Aho, P.E. Principal RMG/jll Arrowstreet – 1804 – LTR – 165 Forest Street – Marlborough, MA – AMSA – Structural Evaluation

ADVANCED MATH & SCIENCE AC ADEMY Marlborough, MassachusettsA r r o w s t r e e t April 13, 2018DRAFT FOR PRICING

3.9 199 Forest Street — Existing

1/32” = 1’-0”

LEVEL 1 - EXISTING (APPROX. ELEV. +430) LEVEL 2 - EXISTING (APPROX. ELEV. +444) LEVEL 3 - EXISTING (APPROX. ELEV. +458)

ADVANCED MATH & SCIENCE AC ADEMY Marlborough, MassachusettsA r r o w s t r e e t April 13, 2018DRAFT FOR PRICING

3.12 201 Forest Street — Existing

1/32” = 1’-0”

LEVEL 1 - EXISTING (APPROX. ELEV. +435) LEVEL 2 - EXISTING (APPROX. ELEV. +447) LEVEL 3 - EXISTING

O

NLY

CR

OS

SW

ALK

CROSSWALK

ON

LY

ON

LY

E

A

S

E

M

E

N

T

EA

SE

M

EN

T

EX

IST

ING

DR

AIN

AG

E

647.7

8'

N78°5

0'1

5"W

286.89'

S07°24'30"W

400.00'

S79°59'20"E

1

9

8

.8

8

'

S

8

2

°5

4

'3

3

"W

5

8

.7

6

'

N

6

6

°

2

3

'3

0

"

W

1

9

1

.2

7

'

S

8

2

°5

4

'3

3

"W

219.81'

N05°06'39"E

3

1

0

.

3

9

'

N

1

5

°

5

9

'4

7

"

W

1

4

8

.

6

9

'

N

5

0

°

3

8

'

3

2

"

E

75.00'

N04°11'46"E

426.72'

N11°09'45"E

8

7

.

4

9

'

N

4

3

°

2

8

'

0

4

"

W

M

H

B

(F

)

M

H

B

(F

)

233.43'

S80°12'45"E

5

4

.

9

3

'

N

5

5

°

2

0

'

2

1

"

E

WATER SUPPLY PROTECTION DISTRICT

APPROXIMATE LOCATION

C

R

O

S

S

W

A

L

K

ST

ON

E D

US

T A

CC

ES

S P

AT

H

RE

TA

ININ

G W

ALL

LIG

HT

LIG

HT

LIG

HT

75.56'

238.62'

N

2

4

°

2

1

'5

4

"

E

4

4

5

.5

2

'

S

6

5

°

3

8

'0

6

"

E

3

0

.0

0

'

N

2

4

°

2

1

'5

4

"

E

1

3

3

.0

1

'

N

02°59'16"W

251.24'

EA

SE

ME

NT

EX

IS

TIN

G A

CC

ES

S &

U

TILIT

Y

210.0

0'

ST

ON

E D

US

T A

CC

ES

S P

AT

H

ST

ON

E D

US

T A

CC

ES

S P

AT

H

8

4

.

4

1

'

E

A

S

E

M

E

N

T

A

C

C

E

S

S

&

U

T

I

L

I

T

Y

E

A

S

E

M

E

N

T

A

C

C

E

S

S

&

U

T

IL

IT

Y

EA

SE

M

EN

T

AC

C

ES

S &

U

TILIT

Y

1

4

6

.2

0

'

SE

E M

UT

CD

F

OR

MA

RK

IN

G D

ET

AILS

CROSSWALK

S

02°53'20"E

149.97'

LIG

HT

L

IG

H

T

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIGHT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIGH

T

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIGHT

LIG

HT

LIG

H

T

LIG

HT

LIG

HT

LIG

HT

LIGHT

LIG

HT

LIG

HT

LIG

HT

LIGH

T

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

LIG

HT

L

I

G

H

T

LIGHT

EXISTING

SCHO

OL

5

'

C

O

N

C

.

S

I

D

E

W

A

L

K

5

'

C

O

N

C

S

I

D

E

W

A

L

K

5' C

O

N

C

S

ID

EW

ALK

BLO

CK

W

ALL

F

I

R

E

L

A

N

E

B

U

S

L

A

N

E

F

I

R

E

L

A

N

E

B

U

S

L

A

N

E

FIRE LANE

FIR

E LA

NE

EXISTING

SCHO

OL

C

R

O

S

S

W

A

LK

C

R

O

S

S

W

A

L

K

E

X

I

S

T

C

L

F

#201 FOREST STREET

#199 FOREST STREET

N

2

4

°

5

2

'2

4

"

E

3

2

9

.7

6

'

N

2

4

°

0

1

'2

0

"

E

6

6

1

.5

1

'

N

2

4

°

2

1

'5

4

"

E

4

4

5

.5

2

'

F

I

R

E

L

A

N

E

4

3

2

4

2

2

4

2

4

426

428

4

2

8

4

2

6

4

3

8

4

4

6

4

4

7

4

3

8

4

3

6

4

3

9

438

4

3

8

4

4

0

442

4

4

0

4

4

04

4

1

4

4

2

444

HC

RA

M

P S

LO

PE

0.0

12 F

T/F

T

HC

RA

M

P S

LO

PE

0.0

13 F

T/F

T

BE

NC

HM

AR

K

X-C

UT

HY

DR

AN

T B

OLT

ELE

V.=

431.7

0

M

H

B

(F

)

N

2

4

°

2

1

'5

4

"

E

3

0

.0

0

'

EA

SE

M

EN

T

AC

C

ES

S &

U

TILIT

Y

T.C

.=432.5

0

CO

NC

. WA

LK

SIG

N

G

R

A

V

E

L

P

A

T

H

S=

0.0

2

TW=449.2SLAB = 435.6

PLA

NT

ER

BO

XE

S

PLA

NT

ER

BO

XE

S

TW=444.5

BW=444.5

TW=449.2

BW=447.1

TW=449.5

BW=445.0

FLU

SH

C

UR

B

BW=447.5

F

L

U

S

H

C

U

R

B

F

LU

S

H

C

U

R

B

F

L

U

S

H

C

U

R

B

C

ON

C S

ID

EW

ALK

CO

NC

SID

EW

ALK

6" C

UR

B

T

Y

P

.

T

Y

P

.

4

1

2

63 spaces

4

3

0

4

1

8

4

2

4

4

2

4

4

2

0

4

1

6

4

1

4

4

2

8

4

3

8

4

3

6

434

4

3

2

432

4

1

8

4

3

0

416

418

432

438

436

434

4

4

8

442

4

4

6

4

3

4

4

3

2

4

4

0

4

4

8

430

4

1

8

4

2

6

422

4

1

6

4

1

2

4

1

4

4

1

4

FIRE LANE

4

4

6

4

4

4

4

4

2

4

4

0

L

A

N

D

S

C

A

P

E

I

S

L

A

N

D

L

A

N

D

S

C

A

P

E

IS

L

A

N

D

W

O

O

D

E

D

A

R

E

A

4

3

8

4

3

8

436

434

4

3

0

4

2

8

4

2

6

4

3

1

432

4

3

2

4

3

2

4

3

2

4

3

2

4

3

2

4

3

2

4

3

0

4

2

8

4

2

6

4

2

4

4

2

2

TO

P B

ER

M=

426

4

2

6

428

426

428

430

FIRE LANE

STUDENT DROP OFF AREA

PR

OP

OS

ED

2"

W

HIT

E P

INE

C.W

.

C

.W

.

4

2

4

PR

OP

OS

ED

AC

CE

SS

&

UT

ILIT

Y E

AS

EM

EN

T

(BE

NE

FIT

FO

R #

165)

PR

OP

OS

ED

AC

CE

SS

&

UT

ILIT

Y E

AS

EM

EN

T

(BE

NE

FIT

FO

R #

201)

E

A

S

E

M

E

N

T

E

X

I

S

T

I

N

G

A

C

C

E

S

S

&

U

T

I

L

I

T

Y

EASEMENT

PROPOSED ACCESS & UTILITY

EASEMENTPROPOSED ACCESS & UTILITY

N83°50'30"W

430.09'

N83°50'30"W

146.70'

Exis

ting tre

es

A

A

PROPOSED EMERGENCY C

ROSS ACCESS E

ASEMENT

N

2

4

°

0

1

'2

0

"

E

5

3

.4

2

'

N86°35'49"W

80.13'

S

8

2

°5

4

'3

3

"W

1

9

8

.8

7

'

PR

OP

OS

ED

HA

YB

ALE

S/S

ILT

FE

NC

E

SE

E D

ET

AIL

PR

OP

OS

ED

2"

W

HIT

E P

INE

PR

OP

OS

ED

2"

WH

ITE

PIN

E

PR

OP

OS

ED

2"

WH

ITE

PIN

E PR

OP

OS

ED

2"

W

HIT

E P

INE

PR

OP

OS

ED

2"

W

HIT

E P

INE

PR

OP

OS

ED

2"

WH

ITE

PIN

E

PR

OP

OS

ED

2"

WH

ITE

PIN

E

PR

OP

OS

ED

2"

WH

ITE

PIN

E

C.W

.

C.W.

C.W

.

COPYRIGHT ©PLANNERS & ENGINEERS

TRANSPORTATION CONSULTANTS, INC.MDM

MDM TRANSPORTATION CONSULTANTS, INC.

PLANNERS & ENGINEERS

28 Lord Road, Suite 280

Marlborough, MA 01752

Tel: (508) 303-0370

Fax: (508) 303-0371

Scale: As Noted

File: 1133 AMSA Campus Concept 6-07-2021.dwgProject No. 1133

Sheet 1 of 1Date: June 7, 2021

Exhibit 1

AMSA Marlborough CampusConceptual Circulation Plan

PREPARED FOR:AMSA MARLBOROUGH

201 FOREST STREETMARLBOROUGH, MA 01752

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

w

advanced math & science academy

Documents