Powell Elementary School Approved Schematic Design (June 2, 2013)

A Existing Site
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Neighborhood Analysis
Site Analysis
Site Drawings
Floor Plans
Architectural Assessment
Engineering Assessment

B Proposed Plans
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Vision:
Powell Elementary School will be a healthy, secure, +

inspiring

place for learning that promotes the school’s focus on
academic rigor in a nurturing multicultural community.

Concept Studies
Preferred Concept
Master Plan - Site Plan
Master Plan - Floor Plans
Program Comparison
Plan to Program Comparison

C Design Narrative
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_
_
_
_

Building Concepts
Sustainability
Perspectives
Classrooms
Building Systems

D Detailed Reports
Civil Assessment
Structural Assessment
Mechanical Assessment
Electrical Assessment
Plumbing Assessment
IT / Security Assessment
Food Service Assessment

| Contents

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2
2.June.2013

APPROVED SCHEMATIC DESIGN - POWELL ELEMENTARY SCHOOL

ISTUDIO
architecture | design | planning

Powell Elementary School is located at the corner of 14th Street NW and
Upshur Street NW. The school is well served by public transportation. Metro
bus lines 52, 53, and 54 run north-south on 14th Street NW and stop at the
northwest corner of the project site. Metro bus lines 60, 62, 63, and 70 stop
on Georgia Avenue 0.3 miles east of the site. The Petworth metro station is 0.6
miles away to the Southeast.


The school is located in a residential area which consists primarily of row
houses, although there are a few midrise apartments integrated into the neighborhood at prominent corners. There is a concentration of schools nearby to
the north and east including Roosevelt High, Hospitality High, Sharpe Health
School, Community Academy Public School, and MacFarland Middle School.
Piney Branch Park is one block west of the site and provides a connection to
Rock Creek Park. Immediately across the street to the north is Upshur Park
and Community Center which includes a baseball field, a soccer field, outdoor
basketball courts, a playground, an outdoor swimming pool, a computer lab, a
kitchen, and a multi-purpose room. The Center offers several classes, camps,
and afterschool programs. The Petworth Library is located two blocks to the
east at Georgia Avenue. Several small scale commercial areas are within
walking distance from the school.

| Existing Site |

Corner of 14th St NW and Upshur St NW

A1
2.June.2013


ISTUDIO

Site Analysis

Load/Unload

| Existing Site |

The east-west orientation of the site presents an excellent opportunity for
solar access because the broad walls of the school face north for even, consistent daylight and south for opportunities to modulate winter and summer
solstice sun angles. Prevailing winter winds come from the northwest and
prevailing summer winds come from the south-southwest. The school sits
up quite high from the street, and there are excellent views to the north and
west. Steep slopes along Upshur St. NW and 14th St. NW present both ADA
access challenges and storm water runoff challenges. There are privacy and
security issues along the alley to the south and residential properties to the
east. Drop-off occurs along Upshur St. NW near the primary entrance which
includes a broad staircase up to the original 1929 building entrance. The
school has only one ADA ramp west of the multi-purpose room which can
only be accessed from the alley at the rear of the site. This back entrance
is also used for deliveries to the school but presents a security challenge
because the gate must remain open at times and cannot be monitored by
security. The teachers and staff enter the building on the east side of the
auditorium near the parking area.

Site Analysis

The original building is a 2-story structure built in 1929 with brick walls, a
slate roof, and a finely detailed interior. It has an “L
”-shaped footprint. The
school was expanded in 1959 to the east with a flat roofed brick building.
This addition has an “L
”-shaped footprint mirroring the original building to
create a courtyard space that is currently being used for parking. The existing brick walls are in fair condition and will need to be repaired and repointed at selected locations. The windows and security grilles are in very poor
condition. The school’s play area is located on a large asphalt expanse to
the west of the original building. Overflow classrooms are housed in a temporary structure known as “The Cottages” and connected to the auditorium
with a very high temporary canopy. At the far southwest corner of the site,
on school property, are gardens that the community uses.

A2
2.June.2013


ISTUDIO

A

Site Plan - Existing

0

25

| Existing Site |

Site Drawings

B

50

A North Elevation - Existing
2.June.2013

B Building Section - Existing


A3

ISTUDIO

DN

DN

DN

T

MAINT.
LOUNGE
224 SF

WEL.
CENTER
335 SF

VESTIBULE

HEALTH
SUITE

VP OFF.

PRE-SCHOOL
754 SF
PRE-KINDERGARTEN
1024 SF

ADMIN. WK.

LOBBY

KINDERGARTEN
1043 SF

CORRIDOR

CORRIDOR

GIRLS

KITCHEN
272 SF

PRE-SCHOOL
810 SF

PRE-KINDERGARTEN
778 SF
PRINC. OFF
197 SF

ELEV.

COUNSELING
RM.
401 SF

KINDERGARTEN
783 SF

BK. RM.
103 SF

STUDENT
SUPPORT
CENTER
463 SF

BOYS

DINING/AUDITORIUM
2957 SF

VEST.

KINDERGARTEN
683 SF

PRE-K
914 SF

VEST.

GIRLS

FOURTH
GRADE
508 SF

Existing Building Summary
sf
Core Academic / Spec Ed

BOYS

CORRIDOR

16,455

Media Center
FOURTH
GRADE
536 SF

1,255

Administration / Health

FIFTH
GRADE
509 SF

1,078

Arts / Music Labs

CRAWL SPACE

1,312

Student Dining + Food Serv

272

Auditorium / Stage

First Floor Plan

Existing

15

4,105

Subtotal

CUST.
OFFICE

0

2,523

Mech, Elec, Toilets, Custod

BOILER
ROOM

Circulation

30
UP

MECH. RM

STO.

Subtotal
Construction Factor
TOTAL AREA

Basement Plan - Existing

27,000
9,456
36,456
0.16

43,445
43,445

| Existing Site |

THIRD
GRADE
536 SF

Floor Plans

DN

68,24
68,

A4
2.June.2013


ISTUDIO

JAN. CL.
TEACHER'S
LOUNGE
377 SF

MUSIC LAB
676 SF

DN

THIRD
GRADE
760 SF

FIFTH
GRADE
773 SF

FIRST
GRADE
697 SF

DN

BK. RM.
84 SF

BK. RM.
112 SF
COLLABORATION
ROOM
773 SF

BOYS

SECOND
GRADE
683 SF

CORRIDOR

CORRIDOR
BK. RM.
109 SF

FIRST
GRADE
685 SF

ELEV.

LIBRARY
1078 SF

ART
666 SF

BOYS

COMPUTER
LAB
502 SF

FIRST
GRADE
698 SF

GIRLS

SECOND
GRADE
692 SF
SECOND
GRADE
689 SF
DN

Existing Building Summary
sf
EDU. COTTAGE
ROOF

Core Academic / Spec Ed

16,455

Media Center

1,078

Arts / Music Labs

1,255

Administration / Health

1,312

Student Dining + Food Serv

272

Auditorium / Stage
Mech, Elec, Toilets, Custod

Second Floor Plan

Existing

2,523
4,105

Subtotal
0

15

30

Circulation
Subtotal
Construction Factor
TOTAL AREA

27,000
9,456
36,456
0.16

43,445
43,445

Floor Plans

STAGE STO.
81 SF

| Existing Site |

STAGE STO.
80 SF

68,24
68,

A5
2.June.2013


ISTUDIO

Classroom - 1959 building

Millwork - 1959 building

Window - 1929 building

Window - 1959 building

Existing Classroom Condition

Boy’s Toilet Rm - 1929 building

Girl’s Toilet Rm - 1929 building



Existing Toilet Rooms Condition

Many teachers report that it is difficult to control the temperature in the classrooms, and it is often too hot or too cold. Some teachers choose not to run
the window A/C units because they are too loud. At times, the heating system
is running so hot that the windows need to be opened. The windows are
single pane throughout the school and are in very poor condition. The 1929
building has wood windows that pivot and slide to open. The 1959 building
has non-thermally broken metal windows that are casement and fixed types.
The windows are not properly sealed and are significantly rusted. Several
glass panes are cracked or replaced with translucent plastic or solid panels.

1929 Classroom Finishes: Paint is peeling, and plaster is cracked at several
locations on the walls and ceiling. Tape marks are visible throughout. The
VCT floors are in fair condition. Closet doors often sit partially open because
the hardware is difficult to operate and/or broken. Original stained wood
crown, door, and window trim is a distinctive feature, but needs to be refinished. The tile wainscot is in fair condition with some chipping and cracks
noted at many locations. It has been found to contain hazardous materials.
Conduit and data cable chases run on the surfaces of the walls.

The existing toilet rooms are in fair condition. Toilet rooms are not in full compliance with ADA. There are two boys’ rooms and one girls’ room that have
ADA toilet stalls, but the doors into those rooms and lavatory fixtures are not
in compliance. The toilet partitions appear to be relatively new and in good
condition. Although the fixtures are old, they appear to be in good condition
generally. The tile floors and walls are in fair to poor condition with several
areas of cracking and mismatched patching noted, especially in the 1929
building. The plaster walls and ceiling in the 1929 building have cracks and
peeling paint.

1959 Classroom Finishes: The original interior CMU walls are in good condition. The VCT floors and rubber base are in fair condition. The acoustical
ceiling tile is in poor condition. The cabinetry below the windows on either
side of the unit ventilators is in poor condition with several broken doors and
shelves noted. The metal interior doors and frames need to be repainted.
The tile floor in the Pre-S, Pre-K, and Kindergarten bathrooms is in poor condition.


Doors and Millwork - 1929 building

| Existing Site |

Classroom - 1929 building

A6
2.June.2013


ISTUDIO

Hallway - 1959 building

Entry Vestibule - 1929 building

East Stair- 1929 building

Abandoned Attic Fan

Administrative Area

Kitchen

Library

Administrative Area

Auditorium

Existing Hallways and Stairs Condition

Existing Support Spaces Condition

Building B, 1929 has terrazzo flooring in the halls which is in good condition.
Stained wood millwork at the building entry is a distinctive feature but needs
to be refinished. There are areas of significant water damage in the west stair
and neighboring janitor’s office. There is significant cracking at the floor line
in the east stair of the 1929 building.

In the auditorium, water leaks (now repaired) have damaged the plaster detailing at the crown at several locations. The plaster walls are cracked, and
the paint is peeling. The tile wainscot is in poor condition with several areas
of cracking, poor patchwork, and missing tile. The east and west exits from
this space to the exterior are heavily used and are consequently in very poor
condition, particularly the wood doors and trim.

Building A, 1959 has VCT floor tiles that are in fair condition with several
patched areas with mismatched tile. The glazed block wainscot is in fair condition, though several cracks and drill holes were noted. The painted CMU
wall finish above the wainscot is in good condition. The acoustical ceiling
tile is in poor condition. The metal doors and frames need to be repainted
throughout.

The kitchen finishes are in fair condition. The finishes in the administrative
areas, teachers’ lounge, and support areas are generally in poor condition
with peeling paint, cracked plaster, and chipped tiles noted. The wood doors
and trim need to be refinished throughout and are in worse condition at hightraffic areas.



Entry Lobby - 1929 building

| Existing Site |


A7
2.June.2013


ISTUDIO

Roof Structure at Cafetorium

‘59 Roof at ‘29 Bldg

Roof Structure at ‘29 Classrooms

Boiler Room

Abandoned Attic Fan

Main Dist. Panel

1929 building classroon

1959 building classroon

Electrical Assessment Summary

Review of public utility records made available did not indicate the exact location (vertical and horizontal) of utilities found within the project work limits, except for an inlet on the asphalt surface and other indiscriminate tops/covers.
The horizontal locations of utilities within the project limits were determined
according to those known and available records. The horizontal location of
gravity systems is indicated on the existing conditions plan. However, the vertical location of the non-gravity systems, (i.g. gas, telephone, electric, etc)
was neither field verified nor confirmed. Therefore, the absence of as-built
plans and field test holes will require the contractor to engage in an exploration for non-gravity utility systems in advance of engaging new utility/site work
to assure clearances are adhered to between new and existing utilities.

Both Building A, 1959 and Building B, 1929 are heated with steam and hot
water produced in a boiler room located in the basement of Building B, 1929.
Steam and hot water are distributed to the building systems through piping in
a crawl space adjacent to the boiler room. The steam piping to the radiators
in Building B, 1929 appear to be in poor condition. And the hot water piping
to the unit ventilators and convectors in Building A, 1959 appear to be in fair
condition.

The building is presently served from an underground electric service. The
incoming service enters the main electrical room located at the basement underground level of Building B, 1929 and terminates at the power company’s
current transformer cabinet with the power company’s meter. From the main
service entrance a disconnect switch with sub-feed serves the Building A,
1959 distribution panel. The main line service switch feeds the main distribution panel (MDP). In addition to the main panels, the branch circuit panels are
located throughout the building. Most of the components of this system are
old and in poor condition.

Throughout the existing buildings, all cooling is done using window AC units
(about 2 tons each). These units were probably installed in 2008, and appear
to be in good condition.
The classrooms are provided with steam radiators in Building B, 1929, and
unit ventilators in Building A, 1959. The unit ventilators are connected to
openings on the side walls for ventilation. Due to the nature of its heating systems, Building B, 1929 receives no mechanical ventilation during the heating
season. The overall condition of the air-side systems is fair.

Structural Assessment Summary
The original 1929 building (Building B) foundations are deep concrete piers
with the bottom of the piers approximately 25 feet below first floor elevation.
The ground floor and second floor are reinforced concrete joist and slab systems supported on reinforced concrete columns. Exterior walls are threewythe unreinforced brick masonry. A steel roof truss system clear spans over
the second floor and supports a concrete roof slab and a lathe and plaster
ceiling below. Interior walls are hollow-clay-tile (terra cotta) and were in some
cases significantly damaged by the August 2011 earthquake.

Additionally, there is a natural ventilation system in Building B, 1929, with
openings in classrooms ducted to the attic where a large fan rejects the air
drawn from the classrooms to the exterior through the cupola. The fan is no
longer working, however.

There is no emergency power to the building. The existing fire alarm system
is old and outdated.
The existing building interior is illuminated with the combination of recessed,
surface, and stem mounted 2’x4’ or 1’x4’ fluorescent lighting fixtures. Generally, these 1’x4’ fixtures are in poor condition. The main corridors are provided with recessed mounted 2’x4’ fluorescent lighting fixtures, which are in
fair condition. The classrooms are also provided with pendant mounted 1’x4’
fluorescent lighting fixtures. Overall, the lighting in the 1929 building appears
to be old and in bad condition, but the lighting in the 1959 building is in fair
condition.
The site lighting is provided by building wall mounted lighting fixtures.

The 1959 addition (Building A) building foundations are concrete belled caissons, with the bottom of caisson approximately 45’ below first floor elevation.
The ground floor, second floor, and roof are reinforced concrete joist and
slab systems, supported on reinforced concrete columns. Exterior walls are
composite brick and CMU block construction. Interior partition walls are CMU
block.


Mechanical Assessment Summary

| Existing Site |

Civil Assessment Summary

A8
2.June.2013


ISTUDIO

water main

main TER

Plumbing Assessment Summary

IT/AV/Security Assessment Summary

Food Service Assessment Summary

Building B, 1929 has a combined system serving both sanitary waste and
storm water. The piping is connected below the original building slab and exits the building as an 8-inch line north towards Upshur Street. Building A, 1959
has separate storm and sanitary waste within the structure and discharges to
the north alongside the original 8-inch combined sewer.

A main telecom equipment room (TER/”MDF”) exists in the health suite in the
main office suite of Building B. A second telecom room (TR/”IDF”) is located
in the secondfloor teachers’ lunchroom also in Building B. Corridor cabling is
routed through a combination of surface mounted raceway and EMT conduit.
In classrooms, cables are run in smaller surface mounted raceways, EMT, and
also run exposed to the classroom. The cabling is not secure and is prone to
casual damage.

The current food service operation is in the main auditorium in Building B
and serves meals prepared off-site. These meals are served on a traditional
serving line to students in multiple lunch periods. The pantry supporting the
operation consists of the minimal amount of equipment required to support
this type of operation both in terms of functionality and sanitation. There are 2
walk-in refrigerator units located in the auditorium.

The storm drainage system of Building B, 1929 consists of downspouts that
discharge into a boot just above grade at each downspout location. These
downspouts are connected to the combined sanitary/storm sewer under the
original structure. Building A, 1959 has a flat roof with old roof drains located
just inside the roof parapet. The storm and sanitary sewer of Building A combine outside the building footprint before discharging to the combined public
sewer.
The current condition of the gas service and associated piping is good, although further coordination with Washington Gas will be required to determine the capacity of the existing gas service.
The existing building does not have a fire protection system.

Data/telephone/video distribution racks are located in the two telecom rooms
described above, and at the demarc in the boiler room. Both the telephone
and the data network have their head end equipment in the TER/MDF. Classrooms are currently minimally wired with only a few data outlets near the
teacher’s desk and 2-4 in the rear of the classroom for students’ PCs. There
is no built-in audio-visual infrastructure for interactive whiteboards or for interaction between a teacher’s computing device and the display device in each
classroom.

Kitchen exhaust fan

Kitchen sink

The existing facility does not meet the current operational goals and requirements of DCPS Foodservice Department, as new elementary schools are utilizing on-site preparation, cooking, and serving methods.

The current intercom headend console is located in the entrance to the health
suite. The console is outdated and may no longer be supported by the manufacturer or capable of expansion.
The burglar alarm seems to be in disrepair at many doors, where the contacts
do not appear to be aligned. The door entry system is also in disrepair and
does not operate the door reliably.
The school has complained of a lack of security camera coverage. The CCTV
head end is located in the TER/MDF in a locked cabinet. It is unclear whether
the system is currently functioning.


The hot water system consists of an outdated gas fired 100 gallon storage
type water heater along with an old 210 gallon horizontal storage tank, which
may contain hazardous insulation materials.

1929 building cabling

| Existing Site |

The school’s domestic water system is supplied by a 4-inch line entering from
the west. The domestic water system throughout the original 1929 building
is steel. Building A, 1959 has primarily copper distribution piping with steel
mains.

second TER

A9
2.June.2013


ISTUDIO

Existing
PROS
- Clear entry and circulation scheme
- Room to expand while keeping outdoor space
- Good site orientation for energy efficiency /
passive strategies (east-west)
CONS
- Separate academic clusters, distant from support spaces
- No good connection to outdoors
- Limited direction for expansion (west + south)
- Not much green space

Option 1 - Expand West in Two Phases

Option 2 - Expand South in Two Phases
PROS
- Engages alley side of site + parking
- Separate outdoor Green Spaces for older + younger ages
CONS
- Site orientation less optimal for energy efficiency /
- Does not follow Cluster Concept, Support Spaces are not centralized
- If phases are reversed, Academic Clusters are distant

| Proposed Plan |

CONS
- Does not follow cluster concept. Support Spaces are not centralized
- If phases are reversed, Academic Clusters are distant

Concept Studies

PROS
- Logical extension of building + circulation along Upshur Street
- Separate Green Spaces for older + younger ages

B1
2.June.2013


ISTUDIO

Preferred Concept
Option 3 - Expand West + South in Two Phases
PROS
- Logical extension of Building + Circulation along Upshur St
- Separate outdoor Green Spaces for older + younger ages
- Good clustering, Academic cores are close to Support Spaces
- Engages alley side of site + parking
- Follows Cluster Concept
- Support Spaces are centralized
CONS
-

This master plan is intended to meet the growing needs of the school and establish a vision for Powell Elementary School as a safe, healthy place for learning
with a well-established connection to the natural environment.
The preferred concept (Option 3) proposes to extend the mainly east-west orientation of the existing buildings and maintain the Cluster Concept of the Education
Specification – Academic Clusters and centralized Support spaces. In this master
plan, a new Academic wing extends west of the existing school from the point
where the main hallway exits to the school grounds. A two-story Support wing
extends south from this same connection point.
The two wings form the north and east edges of a large Green Space providing ready access to the outdoors both physically and visually. Play equipment
and shade trees are located at the perimeter while the center remains open for
the greatest flexibility of use. Equipment here is intended for use by the older
students, particularly those in the academic clusters of the new wing. A Patio
on the south side of the Academic wing connects the classrooms to the Green
Space and provides hardscape play area. An Outdoor Classroom located in the
northwest corner near the exit stair provides a landscaped place for gathering,
screened with plantings from the streets below. Curriculum Gardens are located
near the entrance of the existing Community Gardens to the south. Green Space
is proposed for the area enclosed by the existing school wings in what is currently
the parking lot. These spaces may provide outdoor education and play areas for
the younger children, with easy access from the nearby academic clusters.

2.June.2013

The proposed Academic wing is a north-facing two-story line of classrooms that looks out on Upshur Park across the street. The hallways here
provide visual access and a direct connection to the outdoor spaces. The
Support wing is adjacent to the existing Auditorium and looks out onto the
Green Space to the west. An open Atrium provides a buffer between new
program spaces and the Auditorium, allowing daylight to come in through
the tall arched windows. A new secure entrance is proposed here at the
rear of the site. Parking for visitors and staff is provided nearby in lots with
alley access and require some coordination with DDOT. Loading takes
place at the rear of the building near the kitchen, with screened areas for
waste and recycling.
The Main Entry is landscaped with paved patios and an accessible ramp
to navigate the one-story change in height from street level to school. The
ramp provides a well-located drop-off site and connects with the stair landings leading to each of the building entrances. Plantings that are native or
non-invasive and drought-tolerant provide a healthy, low maintenance outdoor environment. Stormwater management will be provided for quantity
and quality with Low Impact Development strategies such as bioswales,
rain gardens, permeable paving, and rainwater harvest for irrigation. Critical areas for management include the parking strips, the Green Space,
and the landscaped slope on the north edge of the site.

Spaces in the proposed plan are located using the Cluster Concept outlined
in the Education Specification as a guide. Support spaces are located in the
heart of the main building, Building B, 1929 along with the Auditorium. Here a
new Welcome Center and a Security Desk are proposed for the Lobby area.
Pre-school through grade 2 classrooms are located partly in this building and
occupy most of Building A,1959.
The new two-story Academic wing to be built in 2013 will house grade 3
through 5 classrooms along a daylight hallway. Expanded Support spaces
will be housed in the future 2-story wing adjacent to the existing Auditorium.
Student Dining, Kitchen, and Service will be located on the first floor with
access from the rear of the site. A glass Atrium will fill the space between
the Dining and Auditorium spaces and provide a staging area away from the
classroom hallways. Overlooking the Atrium are the Media Center, Computer
and Music Rooms on the second floor. A Grand Stair connecting the two
floors will be built where the three wings conjoin. The Cottages currently in
use will serve as additional space until the support wing is built in the future.


| Proposed Plans |

Plan Concepts

Site Plan Concepts

Preferred Concept

Cluster Concept
Diagram

B2

ISTUDIO

Master Plan - Site Plan

Master Plan
2.June.2013

0

25

50

| Proposed Plans |

Site Plan - Proposed

B3

ISTUDIO

DN

FIRST
GRADE
864 SF

KINDERGARTEN
1003 SF

FIRST
GRADE
864 SF

KINDERGARTEN
1003 SF

KINDERGARTEN
1053 SF

KINDERGARTEN
1000 SF

VESTIBULE
GIRLS

UP

JAN. CL.
55 SF

DN

PRE-KINDERGARTEN
1000 SF

LOBBY

ELEC.
CORRIDOR

GALLERY

UP

ATRIUM

GRAND
STAIR

WEL. CENTER
440 SF
RECORD RM. MAIL RM.
141 SF
118 SF

FAMILY
RESPECT
CNTR
426 SF

DINING/AUDITORIUM
2682 SF

CORRIDOR

SECURITY
76 SF

CORRIDOR

SE
RESOURCE
ROOM
408 SF

BOYS

ADMIN. WK.
163 SF

PRE-SCHOOL
1000 SF

PRINC. OFF
/ CONF RM
446 SF

HEALTH
355 SF

TEACHER'S
TOILET

PRE-KINDERGARTEN
1022 SF

PRO.
LITERACY
RM.
347 SF

PRE-SCHOOL
1000 SF

BK. RM.
170 SF
DN
UP

VEST.

DN

UP

CUST.
OFFICE
252 SF

RECEIVING
AREA
612 SF

CRAWL SPACE

CUST.
OFFICE
150 SF

TOILET /
SHOWER
200 SF

BOILER
ROOM

UP

First Floor Plan

0

16

32

Master Plan

MECH. RM

Basement Plan

GIRLS

*

PRE-KINDERGARTEN
1000 SF

AUDITORIUM
2964 SF

VEST.

KITCHEN
1616 SF

ATRIUM

ELEC. RM.

PRE-SCHOOL
1027 SF


FIRST
GRADE
864 SF

| Proposed Plans |

FIRST
GRADE
835 SF

DN

B4
2.June.2013


ISTUDIO

FIFTH
GRADE
834 SF

FIFTH
GRADE
848 SF

FIFTH
GRADE
849 SF

SCIENCE
STO.
328 SF

FOURTH
GRADE
848 SF

STUDENT
INTRV. RM +
GUID. OFF.
817 SF

SUPPORT
SUPPORT
OFFICE OFFICE
STAFF
RESOURCE 174 SF 173 SF
LOUNGE
ROOM
380 SF
350 SF

VP OFF.
120 SF
BUS. MGT
120 SF

FOURTH
GRADE
830 SF

*

TEACH.
OFF. (2)
519 SF

INST.
COACH
103 SF

THIRD
GRADE
803 SF
DN

THIRD
GRADE
895 SF

SECOND
GRADE
885 SF

BK. RM.
280 SF

ELEC.
CORRIDOR

CORRIDOR

ATRIUM
BOYS

CORRIDOR
TER
GRAND
STAIR

FOURTH
GRADE
773 SF

JAN. CL.
BOYS

*

COLLABORATION
ROOM
1078 SF

TR

STAGE STO.

MUSIC LAB
CORRIDOR 1348 SF

ART
1340 SF

0

16

32

Master Plan


SECOND
GRADE
845 SF

GUID. OFF
258 SF

STAGE STO.

Second Floor Plan

SPEECH
RM.
524 SF

SECOND
GRADE
844 SF

DN

COMPUTER
LAB
970 SF

*

GIRLS

EX. DAY
259 SF

LIBRARY
1704 SF

THIRD
GRADE
849 SF

SUPPORT
OFFICE
168 SF

| Proposed Plans |

CORRIDOR

B5
2.June.2013


ISTUDIO

sf

%

sf

CORE ACADEMIC AREA
Pre-School Classroom

810

1,175

1,027

-12.6

-148


811

1,175

1,000

-14.9

-175


758

1,175

1,000

-14.9

-175

Pre-Kindergarten Classroom

1,024

1,175

1,022

-13.0

914

1,175

1,000

-14.9

-175


0

1,175

1,000

-14.9

-175

Kindergarten Classroom

1,043

1,175

1,079

-8.2

-96


783

1,175

1,053

-10.4

-122


693

1,175

1,036

-11.8

-139


0

1,175

1,000

-14.9

-175

Grade 1 Classroom

697

850

864

1.6

14

Grade 1 Classroom

685

850

864

1.6

sf
Media (Reading / Learning / Circulation-1350 SF)

0

850

864

1.6

14

Grade 1 Classroom

0

850

835

-1.8

-15

Grade 2 Classroom

683

850

885

4.1

35

Grade 2 Classroom

698

850

845

-0.6

-5

Grade 2 Classroom

689

850

844

-0.7

-6

Grade 3 Classroom

536

850

895

5.3

45

Grade 3 Classroom

508

850

849

-0.1

-1

Grade 3 Classroom

536

850

760

-10.6

-90

Grade 4 Classroom

508

850

917

7.9

67

Grade 4 Classroom

0

850

850

0.0

0

Grade 4 Classroom

0

850

820

-3.5

-30

Grade 5 Classroom

0

850

850

0.0

0

Grade 5 Classroom

0

850

850

0.0

0

Grade 5 Classroom

0

850

821

-3.4

-29

Science Storage

0

250

236

-5.6

-14

502

950

905

-4.7

-

-

-

sf

%

sf

-6.4

-

-

100

100

0.0

0

1,078

1,800

1,692

666

1,225

1,215

-0.8

-10

-

total

1,592

-

0

TER Rm/ TR Rm (Telecom Head End Room)

1,700

-

-108

-

-

-

-

ARTS / MUSIC LABS
Art (Art Lab-1000 SF)
(Kiln Room-75 SF) w/ Art
(Storage-150 SF) w/ Art

-

-

-

-

589

1,150

1,136

-1.2

-

-

-

-

1,255

2,375

2,351

324

450

419

-6.9

-

-

-

-

0

Music Lab (1000 SF)

75

76

1.3

-14

-45

600

sf

1,078

(Office/Workroom/Storage-350 SF) w/ Media

14

Grade 1 Classroom

BLDG A,B,C,D
Space Provided

MEDIA CENTER

-153


Ed Spec Area

Computer Lab (Language Lab/Computer Lab)
w/ Computer Lab (Distance Learning)
Student Intrv Rm (Student Support Intervention Ctr)

463

800

773

-3.4

-27

Collaboration Room

773

1,200

1,078

-10.2

-122

Support Offices - 3 @ 150 SF

401

450

502

11.6

767

400

372

-7.0

-28

SE Resource Room (Resource Room)

765

400

474

18.5

74

0

500

534

6.8

34

total

-

ADMINISTRATION
Welcome Center/Mail Rm (Welcome Center-350 SF)
(Mailroom-100 SF) w/ Welcome Ctr
Security Area w/locking storage
Conference Room

-31
1

0

200

246

23.0

46

Principal's Office

197

180

200

11.1

20

VP Office (Assistance Principal Office)

116

120

120

0.0

0

Professional Literacy Room

0

400

347

-13.3

-53

Business Manager Office (Office)

0

120

120

0.0

0

Administrative Workroom

173

150

197

31.3

47

0

120

130

8.3

10

Toilet

34

50

50

0.0

0

Instructional Coach (not in Ed Spec)

**

0

150

-

150

*

150

207

38.0

57

381

355

355

0.0

0

Records Room

Guidance Office (Counselor & Psychologist)

HEALTH
Health Suite (incl Office/Treatement/Stor/Toilet)

52

Resource Room

(Storage-150 SF) w/ Music Lab

Speech Rm (Speech/OT/PT)
Family Respect / Parent Room (not in Ed Spec)

0

0

482

-

482

408

600

562

-6.3

0

250

214

-14.4

0

250

214

-14.4

-36

0

250

207

-17.2

-43

377

Staff Lounge

400

377

-5.8

-23

1,602

3,020

3,201

-36

Workroom/Teacher Office

Extended Day Office/Storage

-38

Workroom/Teacher Office

Other ADMIN

Book Room (Storage)

total

*This space is included with the Student Intervention Room
**This space is included with the Collaboration Room


sf

Existing Spaces
Area

SPACE NAME (ED SPEC IF DIFFERENT)

| Proposed Plans |

Ed Spec Area

BLDG A,B,C,D
Space Provided

sf


Existing Spaces
Area

B6
2.June.2013


ISTUDIO

Existing Spaces
Area

Ed Spec Area

BLDG A,B,C,D
Space Provided

sf


sf

sf

%

sf

DINING / FOOD SERV
Student Dining Area/Multi-purpose (2400 SF)

0

2,643

1.7

-

-

-

1,500

1,508

0.5

8

272

4,100

4,151

2,523

2,400

2,785

16.0

385

0

Kitchen Suite

2,600

-

(Chair and Table Storage-200 SF) w/ Student Dining

350

393

12.3

43

272
total

43
-

AUDITORIUM (Existing)
Auditorium / Stage

ENGINEERING / CUSTODIAL
Receiving (Supply Storage/Receiving)
Toilet/Shower

0
total

200

200

0.0

0

58

Custodian Engineer Office

150

150

0.0

0

58

700

743

*This space is included with the Student Intervention Room

| Proposed Plans |


**This space is included with the Collaboration Room

B7
2.June.2013


ISTUDIO

Building Concepts
This proposal envisions Powell Elementary School as an exceptional place
for learning and an example of a healthy built environment for the community.
The new Powell ES will provide educational spaces that facilitate teaching
and inspire learning. Support spaces will be useful, comfortable, and easy
to maintain. Existing buildings will be rehabilitated, and new buildings will be
built to a higher standard, drawing on precedents from the past as well as lessons learned.

Indoor Environment + Materials
Lighting, technology, and sound systems will be designed for energy-efficiency as well as performance. Daylighting, sightlines, and improved acoustics
each contribute to better conditions for learning. Copious natural light provided by windows will be evenly distributed using translucent materials and light
shelves to minimize glare. Sunscreens, shades, and other devices also help
to control how light enters the building. With the right use of glazing most occupied spaces will have multiple views to the outdoors, establishing a strong
connection with the natural environment. Each space will be designed with
materials to provide the right sound absorption for optimal comprehension
such as acoustic ceilings in classrooms and sound acoustic decking in new
hallways. Building systems equipment will be selected with superior acoustic
properties. Building materials and finishes will be selected for their durability,
ease of maintenance, and their sustainable properties.

Building Concepts

Orientation
The east-west orientation of the proposed Academic wing lends itself well
to designing a high-performing building – one that makes use of simple architectural features to provide supplemental means for heating, ventilating,
and cooling. The south façade is an ideal location for larger amounts of glazing which provide light and views while sunscreens and shading devices can
control solar gain. A hallway at this location provides a transitional space that
buffers a well-insulated classroom on the north side from the wider temperature swings without driving up heating and cooling costs. The north-south
configuration of the Support wing suggests different methods – vertical fins
on the west façade to control solar gain and an Atrium on the east to control
temperature swings in the occupied spaces.

Energy
Energy-efficient HVAC systems are a baseline for a green school. However,
there are supplementary systems such as passive cooling and ventilating that
can save a lot in energy costs and minimize the negative effects of non-renewable energy use. Strategies for natural ventilation such as cross-ventilation
and ventilation flues make use of natural methods to promote airflow where
needed for a comfortable indoor environment while providing teachable moments about the natural world. Solar chimneys with exhaust turbines take
advantage of the heat of the sun and the stack effect to move fresh air through
an occupied room. When outdoor conditions are right, a light goes on in the
classroom letting the students and teacher know it’s time to open windows
to catch a cool breeze. A similar system may be employed in the 1929 building which was designed for natural ventilation before the development of air
conditioning. Ventilation flues, discovered in the building during survey, most
likely explain why the 1929 building (Building B) was often found to be more
comfortable than the 1959 building (Building A) where these features don’t
exist.

Key

| Design Narrative |

1. Prevailing Breezes
2. Natural Ventilation
3. Operable Windows
4. Indirect/Direct Lighting
5. Ventilation Flue / Solar Chimney
6. Light Shelf
7. Acoustical Metal Deck
8. Operable Dampers
9. Acoustic Ceiling
10. Perforated Metal Screen
11. Exhaust Turbine
12. Natural Ventilation Indicator Light
13. Vented Cupola

Phase 1 Addition Cross Section
2.June.2013

1929 Building Cross Section


C1

ISTUDIO

Sustainability
Successful sustainable design strategies employed in new schools and public buildings in the District
and across the nation include:
1. Shaw Library, Washington, DC: South facing perforated metal screen for shading
2. Newberg Center, Newberg, OR: Passive heating, cooling, and ventilation
3. Sidwell Friends School, Washington, DC: Light-shelves and solar chimneys
4. Tenley / Friendship Library, Washington, DC: Vertical louver system for solar control
5. Stoddert Elementary School, Washington, DC: Day lit single loaded corridor
A preliminary review of the concept design with the LEED for Schools standard identified 53 probable
points and another 31 possible points for a LEED-Silver rating if certified. Note that many of the Indoor
Environmental Quality LEED points will be achieved simply by satisfying the performance criteria outlined in the Ed Spec.

1
LEED 2009 for Schools New Construction and Major Renovations

2

Powell Elementary

Project Checklist

?

Prereq 2
Credit 1

2

Credit 2

2

Credit 3
Credit 4.1
Credit 4.2

2
2
1
1

Credit 4.3
Credit 4.4
Credit 5.1
Credit 5.2

1
1

Credit 6.1
Credit 6.2

1
1
1

Credit 7.1
Credit 7.2
Credit 8

1

Credit 9

Construction Activity Pollution Prevention
Environmental Site Assessment
Site Selection
Development Density and Community Connectivity
Brownfield Redevelopment
Alternative Transportation—Public Transportation Access
Alternative Transportation—Bicycle Storage and Changing Rooms
Alternative Transportation—Low-Emitting and Fuel-Efficient Vehicles
Alternative Transportation—Parking Capacity
Site Development—Protect or Restore Habitat
Site Development—Maximize Open Space
Stormwater Design—Quantity Control
Stormwater Design—Quality Control
Heat Island Effect—Non-roof
Heat Island Effect—Roof
Light Pollution Reduction
Site Master Plan
Joint Use of Facilities

1
2
Y
2

2

Credit 10

7

Water Efficiency
Prereq 1

2

Credit 1

2
4
1

Materials and Resources, Continued

Possible Points: 24
Y

Prereq 1

1
2
1

Sustainable Sites

N

Credit 2
Credit 3
Credit 3

1
4
1
4
1
2
2
1
1
1
1
1
1
1
1
1

2 to 4
2
2 to 4
1

2
2

Y
Y
Y
12 7

Energy and Atmosphere
Prereq 1
Prereq 2
Prereq 3
Credit 1

7
2

Credit 2
Credit 3

1

Credit 4

2
2

Credit 5
Credit 6

Credit 5

1

Credit 6
Credit 7

16 3
Y
Y
Y
1

Prereq 2
Prereq 3
Credit 1
Credit 2
Credit 3.1
Credit 3.2

2

Credit 4
Credit 5
Credit 6.1
Credit 6.2
Credit 7.1
Credit 7.2
Credit 8.1
Credit 8.2
Credit 9
Credit 10

3

Fundamental Commissioning of Building Energy Systems
Minimum Energy Performance
Fundamental Refrigerant Management
Optimize Energy Performance
On-Site Renewable Energy
Enhanced Commissioning
Enhanced Refrigerant Management
Measurement and Verification
Green Power

1
1

3

Materials and Resources
Prereq 1
Credit 1.1
Credit 1.2
Credit 2

Possible Points: 19

Minimum Indoor Air Quality Performance
Environmental Tobacco Smoke (ETS) Control
Minimum Acoustical Performance
Outdoor Air Delivery Monitoring
Increased Ventilation
Construction IAQ Management Plan—During Construction
Construction IAQ Management Plan—Before Occupancy
Low-Emitting Materials
Indoor Chemical and Pollutant Source Control
Controllability of Systems—Lighting
Controllability of Systems—Thermal Comfort
Thermal Comfort—Design
Thermal Comfort—Verification
Daylight and Views—Daylight
Daylight and Views—Views
Enhanced Acoustical Performance
Mold Prevention

Innovation and Design Process
Credit 1.1
Credit 1.2

1
1
1 to 19
1 to 7
2
1
2
2

1

Credit 1.3
Credit 1.4
Credit 2

1

Credit 3

Possible Points: 13

Storage and Collection of Recyclables
Building Reuse—Maintain Existing Walls, Floors, and Roof
Building Reuse—Maintain 50% of Interior Non-Structural Elements
Construction Waste Management

Credit 1.3

1 to 2
1
1 to 2

53 31 22

Regional Priority:
Regional Priority:
Regional Priority:
Regional Priority:

Specific
Specific
Specific
Specific

4

1
1
1
1
1
1

Possible Points: 4
Credit
Credit
Credit
Credit

Total
Certified 40 to 49 points

1
1
1
1
1 to 4
1
1
1
1
1
1 to 3
1
1
1

Possible Points: 6

Innovation in Design: Specific Title
LEED Accredited Professional
The School as a Teaching Tool

Regional Priority Credits
Credit 1.1

Credit 1.4

Y
2
1
2

1 to 2
1 to 2
1 to 2
1
1

Possible Points: 33

Credit 1.2

10

Materials Reuse
Recycled Content
Regional Materials
Rapidly Renewable Materials
Certified Wood

Indoor Environmental Quality
Prereq 1

1
1
1
2
1
1
1
1
1
3
1
1
1

Credit 3
Credit 4

1

3
13 11 9

N

2

Possible Points: 11

Water Use Reduction—20% Reduction
Water Efficient Landscaping
Innovative Wastewater Technologies
Water Use Reduction
Process Water Use Reduction

?

1
1
1
1

Possible Points: 110
Silver 50 to 59 points

Gold 60 to 79 points

Platinum 80 to 110

3

5

Sustainability

Y

Y
Y
1
2


9 12 3

C2
2.June.2013


ISTUDIO

Perspectives

C3
2.June.2013


ISTUDIO

Perspectives

C4
2.June.2013


ISTUDIO

Perspectives

C5
2.June.2013


ISTUDIO

FURNITURE:

CEILING:

F3

F3

F3

F3

F3
L5
F4B

L9B
L1

L9B

L9B
L2
F4B

L4B
L4A

Linear Pendant Fixture + Acoustical Ceiling
Linear Pendant: LITE CONTROL - ARCOS
Acoustical Ceiling: MARS CLIMAPLUS w/FINELITE DXF GRID

KI Student Desk
Student Desk

KI Intellect Wave Chair
Student Chair
L3

SMART
Board

Millwork

F4A

F6

CL.

F4A

?

L9B

SECOND GRADE FURNITURE PLAN

L1
L2
L3
L4A
L4B
L5
L9B

STUDENT TABLE
COMPUTER TABLE
BOUND CARPET RUG
TEACHER'S CHAIR
TEACHER'S DESK
2 DRAWER LATERAL FILE
STACKABLE CHAIR

19"
19"

15"

24
3
1
1
1
1
27

SECOND GRADE - CASEWORK SCHEDULE
TYPE
DESCRIPTION
HEIGHT COUNT
Accent Wall/Canopy
@ Entry Door
FLOORING:

MILLWORK

F2
F3
F4A
F4B
F6

Cubbies: Refurbish
existing closet w/
new millwork

ECORE Ecosurfaces
Cork/Rubber flooring (Option 1)
Refinish existing floor (Option 2)

2.June.2013

SECOND GRADE AXON VIEW

Plywood veneer panels

Wilsonart Laminate to match KI Millwork
Laminate Countertop colors


CUBBIES
WALL SHELVING

SMART BOARD

2' - 3"

1
5
2
2
1


SECOND GRADE - FURNITURE SCHEDULE
TYPE
DESCRIPTION
HEIGHT COUNT

Classrooms

1/8" = 1'-0"

C6

ISTUDIO

FURNITURE:

CEILING:

F3

F3

F1B

F1B

F1B

L4B

L5

L9B

L4A
F4A

L3

L1B

L9C

SMART
Board

L3

L1B

Linear Pendant Fixture CONTROL - ARCOS
Linear Pendant: LITE + Acoustical Ceiling
Acoustical Ceiling: MARS CLIMAPLUS w/FINELITE
DXF GRID

KI Student Desk
Student Desk

Student Chair

Case Systems Cubbies
Cubbies

L1B
L9C
F6

L9C
L9C
L8

L9C

L8
L1B

Millwork

L1B

F4A

F3

F3

KINDERGARTEN FURNITURE PLAN

L1B
L2
L3
L4A
L4B
L5
L9A
L9B
L9C
Accent Wall/Canopy
@ Entry Door

ECORE Ecosurfaces
Cork/Rubber flooring

15"
15"

5
4
2
1
1
1
1
3
20

KINDERGARTEN - CASEWORK SCHEDULE
TYPE
DESCRIPTION
HEIGHT COUNT
Cubbies

FLOORING:

DESC
COMPUTER TABLE
BOUND CARPET RUG
TEACHER'S CHAIR
TEACHER'S DESK
STACKABLE CHAIR
STACKABLE CHAIR
STACKABLE CHAIR

F2
F3
F4A
F4B
F6

MILLWORK


Laminate Laminate colors
Wilsonart Countertop to match KI Millwork

CUBBIES
WALL SHELVING

SMART BOARD

KINDERGARTEN AXON VIEW

2' - 3"

1
5
2
2
1


KINDERGARTEN - FURNITURE SCHEDULE
TYPE
DESCRIPTION
HEIGHT COUNT

Classrooms

1/8" = 1'-0"

C7
2.June.2013


ISTUDIO

FURNITURE:

CEILING:

L5

F3

F3

F3

F1

F1

L4A

L9A

L1
L3

L4B
F4A

Linear Pendant: LITE CONTROL - ARCOS
Linear Pendant Fixture + Acoustical Ceiling

KI Student Desk
Student Desk

Student Chair

Cubbies
Case Systems Cubbies

Acoustical Ceiling: MARS CLIMAPLUS w/FINELITE DXF GRID
SMART
Board

L3

F6

Millwork

Natural ventilation
louvers + indicator light

F4A
L9A

F2

FIFTH GRADE - FURNITURE SCHEDULE
TYPE
DESCRIPTION
HEIGHT COUNT
L1
L2
L3
L4A
L4B
L5
L9A
Accent Wall/Canopy
@ Entry Door

Cubbies
MILLWORK

FLOORING:

ECORE Ecosurfaces
Cork/Rubber flooring
2.June.2013

FIFTH GRADE AXON VIEW


STUDENT TABLE
COMPUTER TABLE
BOUND CARPET RUG
TEACHER'S CHAIR
TEACHER'S DESK
STACKABLE CHAIR

22"

27"
15"

24
4
2
1
1
1
28

FIFTH GRADE - CASEWORK SCHEDULE
TYPE
DESCRIPTION
HEIGHT COUNT
F1
F2
F3
F4A
F6

BASE CABINET 45"
CUBBIES
WALL SHELVING
SMART BOARD

Wilsonart Laminate to match KI Millwork
Laminate Countertop colors


2' - 3"
3' - 0"
2' - 3"
4' - 0"

2
24
3
2
1


1/8" = 1'-0"

Classrooms

FIFTH GRADE FURNITURE PLAN

C8

ISTUDIO

Civil Recommendations

Mechanical Recommendations

Electrical Recommendations

New 6”-8” sanitary sewer connection(s) will be located on the south face of
the new building addition and directed towards the 14th Street right of way.
New water service (domestic and fire) will be located on the west face of
Building B, 1929 at the location of the existing Basement Utility room, routed
around the south side of the cottage, and directed toward the 14th Street
right of way and. During Building C work the existing 2” gas line may be kept
in service. The new building may require new electric and telecommunications ductbank(s).

The design team evaluated four different mechanical systems for performance
maintenance and cost.

The new incoming electrical service must be upgraded in Phase 1 to support new HVAC systems and the new addition buildings. The entire existing
power distribution system must also be removed and replaced/upgraded as
required. Some branch wiring panels shall be reused.

Structural Recommendations
The new buildings will be founded on deep foundations similar to the 1920’s
and 1950’s construction. The proposed system is helical piers driven 25-30
feet below grade with pile caps. The ground floor slab will be a structured
slab that will span between concrete girders and beams, supported on pile
caps. The concrete stairs and ramps to the south of Building C will be similarly structured. These slabs will be formed though not supported on fill material
to meet the required elevation. The primary structural system will likely consist of structural steel columns supported on cast-in-place concrete pile caps.
Steel girders will span between steel columns to create a grid of structural
bays. The second floor will likely consist of a concrete slab on metal deck
spanning between steel beams spanning from exterior to the corridor and assumed at approximately 18 inches deep. The roof deck will likely consist of
a metal roof deck supported on open-web steel roof joists. Exterior walls are
expected to consist of metal stud walls with a large extents of glass. Metal
panel rain screen façade will be supported by the stud walls. These exterior
walls will likely be supported on grade beams spanning between pile caps.
The lateral system will consist of steel braced frames. Interior elements would
be integrated with corridor and classroom walls.

An interim mechanical system for Building A, 1959 is to replace the unit ventilator two-pipe system with hot water provided by the existing boilers (converted to hot water boilers) and chilled water provided by new air-cooled chiller.
In Building A this system will allow for the best performance for the best value
with the least disturbance of existing infrastructure since existing pipes, intakes, and boilers can be reused.

The existing fire alarm system should be replaced; however, it is acceptable
for the contractor to selectively replace components of the system to correct
deficiencies.
The lighting upgrade should be carried out in the respective phases of construction. It is recommended that the occupancy sensors be used with dual
override switches to control all interior non-emergency lighting in the building,
mainly the offices and classrooms.
The exterior lighting will be controlled via a combination of photocell and time
clocks, wired via a contactor panel.
Where applicable, the existing convenience receptacles will be reused, provided they are in a proper working condition and are a grounded type. New
20 amp grounding type duplex convenience receptacles will be provided on
an as needed basis for the new space layout.

The proposed natural ventilation system for Building A, 1959 is similar to
Building B, 1929. On mild weather days green notification lights will illuminate
in the classrooms indicating that conditions are right to open the windows.
The classrooms will be vented to plenum spaces that are to be linked to the
corridors and up to rooftop monitors and fan systems. When possible the
exhaust ventilation system will function passively, otherwise fans will come on
to mechanically assist.
The proposed natural ventilation system for the addition Building C uses solar
chimneys. These structures take advantage of solar heating at the top of the
chimney and prevailing wind dynamics to passively draw air out of the classrooms. An indicator light will come on in each classroom when conditions
are right to open the windows. Turbines will be located in the solar chimney
to mechanically supplement the system as required. Dampers will prevent
downdrafts.

Building Systems

Site grading will include the new building addition and surrounding play surface area improvements, the ADA ramp along Upshur St NW, new site parking
lot, and service access improvements.

In the main electrical room, two new fused safety switches will be planned, one
for the emergency power distribution system and another for the fire pump.


A series of new storm drain pipe system(s) will be introduced throughout the
site to safely convey the runoff (generated by the new improvements) and
connect to the existing storm drain network. We anticipate the storm water
quantity control system to consist of a new underground system with a 36”
– 48” CMP piping network built underneath the play area and various check
dams or swales surrounded by vegetation. There may be other options available to provide quantity control such as a new cistern system. Proposed
quality control improvements at the parking areas include StormFilter like
structures.

The proposed mechanical system for all buildings is a Variable Refrigerant
Volume system (VRV) with Dedicated Outdoor Air System (DOAS). This system will avoid cutting intake louvers into the existing historic brick facade of
Building B, 1929. The condensing units of the VRV systems are to be located
on the flat roofs of Building A and Building C. The DOAS will be installed
in the attic of Building B,1929 and ducting will be located in existing shaft
spaces perhaps using existing ducts. On mild weather days (monitored by
rooftop weather stations and defined by outside temperature and humidity)
the natural ventilation system will run passively. A green notification light will
illuminate in each classroom indicating that the VRV and DOAS need not run
and that conditions are right to open the windows. The rooms in Building B,
1929 are currently linked to shaft spaces that open to the attic. The existing
cupola vents the attic which will in turn draw air from the classrooms through
the shafts thereby promoting fresh air flow through the classrooms when the
windows are open. The classrooms in Building C will have access to solar
chimneys. There will be a backup fan system to supplement the passive system as required.

C9
2.June.2013


ISTUDIO

Plumbing Recommendations

IT/AV/Security Recommendations

Food Service Recommendations

A full video auger scan of the existing sanitary mains shall be requested to
assure that all lines are clear and not damaged. The proposed future addition shall require new sanitary waste tap to street sanitary main. Every group
restroom shall have a new floor drain installed for emergency purposes. All
toilet room fixtures shall be replaced with new units, and associated low-flow
flush valves and faucets.

Telecom Rooms should be well lit, environmentally conditioned spaces dedicated to low voltage equipment. The current location and arrangement of
telecom equipment is not suitable to a modernized school, and new telecom
rooms should be established. Classrooms shall contain low voltage pathways allowing for a neat and orderly installation of data, telephone, audiovideo and intercom distribution cabling.

The space required for the new kitchen and serving area functions is approximately 1,500 SF. The space will consist of receiving, a toilet room, employee
lockers, dry storage room, refrigerated / frozen storage (walk-in), food preparation area, food production area (cooking), serving line with two point of
sale stations, foodservice office with view of serving line and seating area,
warewashing and soiled dish drop off window, and storage / staging area for
prepared meals.

The incoming domestic water supply is sufficiently sized for the school demand. The condition of the valves and associated piping inside the structure
is poor, with an upgrade needed for a new backflow prevention device along
with all downstream domestic piping.

Classrooms should have outlets at the Teacher station for a PC, Voice-over-IP
phone and possible IP-enabled accessory (printer, etc.). Classrooms should
have outlets located on the teaching wall for a wall mounted projector, 4-6
outlets at the back/side of the room for student PCs and other IP-enabled devices, and an outlet to enable a wireless access point. The video distribution
system should be capable of supporting all standard formats to display images on demand at every classroom. Space and power should be allocated
for a SMARTBoard or Promethean interactive whiteboard in all classrooms.
A sound reinforcement amplifier and DVD player should be located on a wallmounted shelf in close proximity to the Teacher’s station. Classrooms not
receiving an interactive whiteboard should include a projector and pull-down
screen. Every classroom should contain a clock/speaker assembly in good
working order located in a consistent location in all classrooms.

Depending on the future layout of the new addition more storm leaders and
drains will be necessary to convey storm water. A new tap to the street main
will be required to convey the added roof runoff from the new addition.
The current condition of the gas service and associated piping is in good condition. The mechanical equipment upgrade may require new gas piping to be
routed through the structure to supply natural gas to these units.
A new fire service shall be installed to serve Powell Elementary. Coordination
with the DC Fire Marshal is required to determine the range of systems, and
allow for the sprinkler installation at the future addition only.

Exterior doors shall be wired with door sensors, and sensitive areas shall
contain motion sensors with appropriate zoning. CCTV cameras should be
located in vandal-proof smoked domes throughout the facility. Cameras
should cover strategic areas, including points of egress, corridor junctions,
stairwells, exterior vestibules, main office, computer lab, auditorium, and
multi-purpose room.
The cafeteria and multi-purpose rooms shall have an auxiliary sound system
including rack or cabinet mounted electronics consisting of pre-amplifiers,
mixers, program sources, equalizers, amplifiers, wireless microphone inputs,
assistive listening stations, and storage space for microphones. The multipurpose room should also contain a large format LCD projector and screen
appropriate for the space.

Building Systems

The storm system serving the original 1929 structure (Building B) shall be
detached from the sub-slab combined sewer. New storm piping shall be
installed and coordinated with the civil engineer to route associated downspouts and area drains separately from the sanitary waste. The storm system
for the 1959 addition (Building A), much like the sanitary shall be snaked and
tested for leaks and cracks. Existing roof drains may require replacement
due to age.


The existing domestic hot water system shall be removed and replaced.

The facility shall have access to the loading dock and the dumpsters / recycling area. The space shall have direct access to the cafeteria seating area.
The dining area shall have direct access to self bussing trash area and the
warewashing drop off window. All architectural finishes and surfaces shall
be durable and easily cleanable to meet the requirements set forth by DCPS
and the Department of Health.

C10
2.June.2013


ISTUDIO

The project scope calls for the existing Powell Elementary School Building to be
expanded to include a new addition to be built on the west side of the existing
Building B, 1929 building. This work will be performed in phases as part of the
Master Plan in which the first addition will consist of a 13,500 s.f. building
addition (Building C Addition). The second building addition will occur in the
future and will consist of a 24,000s.f. building addition (Building D addition).
There will be other site improvements made to enhance the uses of the existing
and new work being built. The improvements include but are not limited to a
new ADA accessibility path along the front entrance from Upshur Street, N.W.
Underground utility improvements will also be included as part of the
improvements for this school.
2. EXISTING BUILDING STRUCTURE/FOUNDATION
The existing building B, 1929 and the existing Building A 1959 additions will be
maintained as part of these improvements. There will be minor exterior
modifications required for the new Building C addition to be made.
The location of the existing school structure will create a challenge in terms of
having adequate access for the contractor to use. Direct vehicle access from
any of the two main streets will not be possible due to the significant grade
changes. The existing temporary classrooms currently located on the asphalt
play area will remain in operation during this first building C addition.
3. SITE UTILITIES
The adjacent roads and driveways are currently improved with the utilities
required for construction, (i.e. sanitary sewer, water, storm drains, gas and
electric). The new water service (domestic and fire services) will be made to the
existing water line on 14th Street, N.W. The new sanitary service lateral will also
be made to the existing system on 14th Street N.W. The new storm drain pipe
connection(s) needed to discharge the onsite runoff will be made to the system
on 14th Street N.W. The other utility connections for telephone, electric and gas
will be made toward the public alley (south side of property).We do not
anticipate a new utility connections to be made to the Upshur Street right of way.
Review of public utility records made available did not indicate the exact location
(vertical and horizontal) of utilities found within the project work limits, except for
an inlet on the asphalt surface and other indiscriminant tops/covers. The
horizontal location of utilities within the project limits were located and shown on
the plans according to available records. The horizontal location of gravity
systems is indicated on the existing conditions plan based on record data
and/or field observation. However, the vertical location of the non-gravity

2.June.2013

The following is a summary of utility services and how they will be implemented:
Sanitary Sewer – New 6”-8” sanitary sewer connection(s) will be located on the
south face of the new building C addition and directed towards 14th Street right
of way. The 6”-8” PVC lateral connection(s) will be made to the existing 15”
sanitary sewer line that runs in a north-south direction along 14th Street. The
length of run for the sanitary service(s) is anticipated to be 250l.f.
Water Line–New water service (Domestic and Fire) will be located on the south
face of the new building addition and directed toward the 14th Street right of way.
The alignment of the new water tap will be made so as to not impact the existing
temporary trailers. Therefore the new water service lines will run in an east-west
direction to allow the waterline to enter the current water meter area inside the
building B 1929 basement. The size of the domestic water service is anticipated
to be 4” DIP Class 52. The size of the fire water service is shown to be 8” DIP
Class 52. Other water line work may also be needed as it relates to new fire
hydrant(s) to new locations that are better suited with the new improvements.
The length of run for the water service(s) is anticipated to be 250l.f.
A water meter vault as well as a back flow preventer(s) will be installed as part of
the new water line improvements.
Gas Line – The existing gas service that originates along 14th Street may need to
be rerouted as part of the improvements indicated on the Master Plan. However,
during the first addition work this existing 2” gas line may be kept in service. The
existing gas main runs east to west from 14th Street directly into the existing
building B. The point of connection for the new gas service is not known at this
time. We are in the process of determining if it is a high or low pressure system.
Electric Service – There are various electric ductbanks that run along the rear
public alley which serve the light poles and building main service. The existing
electric service is believed to be routed toward the public alley where the
underground ductbanks and electric manholes are found to exist. This system
will remain in operation during the building C addition phase of work. The new
building will require new electric ductbank(s) primary and secondary to and from
new pad mounted electric transformer(s). The location of these electrical
systems is not known at this time. New light poles may be required to provide
adequate safe areas around the site. Refer to electrical engineers narrative for
more detailed information.


Civil Assessment

1. PROJECT INTRODUCTION

systems, (i.e. gas, telephone, electric, etc) was not field verified and are only
shown per records made available. Therefore, the absence of either as-built
plans or field test holes will require the contractor to engage in some type of
exploration for non-gravity utility systems in advance of engaging new utility/site
work. The contractor will need to get involved in conducting test pit(s) to
determine the actual depth of the non-gravity systems located within the project
work limits. This is needed in order to assure clearances are adhered between
new and existing utilities.

| Detailed Reports |

Civil Assessment

D1

ISTUDIO

A full engineered sediment control application will be required to be filed to the
DDOE for review and approval.
5. STORM DRAINAGE
A series of new storm drain pipe(s) system(s) will be introduced throughout the
site to safely convey the runoff (generated by the new improvements) and
connect to the existing storm drain network. The pipe sizes will vary from 6” to
18” Dia. depending on the drainage area and purpose of the pipe(s). There is an
existing storm drain grate inlet located along the northern edge of the asphalt
play area that accepting runoff which has filled up with silt/debris and outlet pipe
cannot be determined. We intend to keep this inlet in place and use it as our
point of discharge provided it has the adequate inverts to discharge properly.
The point of connection for the new storm drainage system will be this structure
unless field conditions dictate otherwise.
It is very possible that a new storm drain connection to the existing 18” Sewer
located in public will be required.
The new ADA handicap ramps and other impervious surface improvements will
require the installation of trench drains to receive the runoff and will be directed
toward a nearby LID system or small quality treatment structure (WQS-1)
consisting of StormFilter MH type of device to treat the localized runoff. The
main parking area and service access will need to be graded to drain to a low
point where a series of trench/inlet type structures will direct the runoff towards
another localized LID system or Stormfilter MH type structure. The top/slab(s) of
the storm structures will need to be designed to allow H-20 type loads. There are
very limited inlets/structures found within the parking lot and play surface areas.
The new building C addition area as well as the remaining play areas may be
subject to localized ponding whenever storm events occur that are greater than
the 15yr storm event. In such instances new structure(s) will be introduced at
key locations to serve as an emergency spillway to convey surface runoff and
direct it away from the building and toward the nearby stormwater system(s) of
adequate capacity to handle the additional runoff.
The public alley located in the back of the site will present a challenge in terms
of providing adequate surface drainage relief. The current site conditions
indicate the surfaces to be inadequate and in need of maintenance/repair.
Unfortunately the cost for such effort may prove too high to include it as part of
the first addition work. Our recommendations will include minimal repairs and
2.June.2013

6. STORMWATER MANAGEMENT
A review of the District of Columbia’s Department of the Environment (DDOE)
related to the Stormwater Management (SWM) requirements for this project will
require SWM Quantity &Quality Control for the impervious area created by the
proposed building and associated improvements.
We anticipate the quantity control system to provide for this project to consist of
a new underground system consisting of 36” – 48” CMP piping network built
underneath the play area. There may be other options available to provide the
quantity control required by DDOE including but not limited to surface check
dams along the perimeter of the site which may be surrounded by vegetation.
Another method to provide some quantity control could be the use of a new
cistern system that will be used to service the building. It is our understanding
based on recent experience that DDOE will allow a cistern to hold the required
volume provided it does not receive any untreated runoff from parking
lots/streets/driveways that may be carrying grit and oils. We primarily intend to
direct the drainage of any driveway/parking areas to a water quality treatment
structure before it is piped into the cistern.
DDOE views any parking/loading surfaces as the primary target areas that are
subject to many types of pollutants and forms of debris (solids as well as in
liquid form such as oil, chemicals) that will enter the trench drain. To minimize
the impact the runoff will have on the new WQS structure, a pre-treatment
structure will be introduced to treat oil and grit being generated. The manhole
structure will have a permanent 3’ deep water pool at the bottom.

Civil Assessment

4. EROSION AND SEDIMENT CONTROL

overlay to minimize low ponding areas. Any new parking that may be sited along
the alley will be evaluated to make sure it meets DDOT and DCRA regulations.

As previously mentioned the storm quality treatment will be provided by
introducing StormFilter like structures along the asphalt pavement surfaces that
are subject to vehicular traffic. One main structure (Stormfilter type) is
anticipated to be sited to handle most of the new impervious work. It will be
placed at a location sufficiently enough to enable a gravity system to discharge
into the existing sewer system. The StormFilter structures will be sized to meet
the minimum requirements of the DDOE regulations. The preliminary size of
each of these precast treatment structures is 9’ wide x 17’ long and 8’ high. Each
structure will contain approx. 8-18 cartridges filled with selected materials for
treatment purposes.


Telecommunications – A new telecommunications ductbank running parallel
with the new electrical ductbank will be required as part of this construction. A
new telephone manhole may be required to be constructed near the elec.
/telephone room. The location of an existing telephone manhole is not yet
known but, further investigation will be required to confirm the existing service
location.

The StormFilter structures will be sized to not only meet the minimum
requirement of the DDOE but, also meet the LEED certification criteria. Some of
the roof areas may be green and may receive some form of irrigation from a new
cistern. It is not clear at the moment what percentage of the roof may be green
but if is feasible a cistern will be sited for irrigation purposes. A preliminary size
of the cistern is anything between a 15,000 - 30,000 gallon tank.
7. SITE GRADING & AMENITIES


D2

ISTUDIO

The project site area will comprise of four components that will consist of the
following:
1. The new building C addition (13,000 s.f) and surrounding play surface area
improvements (First Addition)
2. The ADA ramp connectivity from public areas to the front of the existing
building and new building C addition (First Addition)
3. New site parking lot and service access improvements (First Addition)
4. New access to site area and Security Fencing/Gate required (First Addition)
Each of these components will require certain key site conditions that should be
included as part of the cost analysis. The following is a brief list for each
component:

iv.
v.

Excavate an average of 3’ to meet FFE of building.
Pavement surface to be heavy duty pavement for vehicular areas.
Install water, sewer, storm drain, elec. tel, quality/quantity
structures and meter/valve(s)
Remove any fill material within work area not suitable for use.
Confirm condition of existing gravity systems and provide
videotape for justification of reuse with agencies. Clean all
structures as needed to justify condition of pipe(s).

2. ADA Handicap Access
i.
ii.
iii.

Existing exterior steps along Upshur Street to be altered as
needed to adapt a new handicap ramp.
Build new ADA ramp connection along northern face of building
mass.
Construct railing and minimum landscape vegetation along walls.

3. Driveway w/ parking
i.
ii.
iii.
iv.

Heavy duty Asphalt pavement section for entire driveway.
Limited excavation is needed for the driveway (almost at grade)
Concrete curb and sidewalk, lighting and gates needed.
Select Fill material will be needed where the poor soils are found..

4. Access Drive/Entrance
i.
ii.
iii.
iv.

Clearing and demolition of items will be required.
Limited excavation will be required. Access area is at grade.
New access gate may be required along public alley.
Lighting and security fence (8’ high wrought iron fence) needed.


i.
ii.
iii.

Civil Assessment

1. New Building C Addition (13,000 s.f.)

D3
2.June.2013


ISTUDIO


Civil Assessment

Civil Assessment

D4
2.June.2013


ISTUDIO


Foundations:
Per the project geotechnical report, the new building will be founded on deep
foundations similar to the 1920's and 1950's construction. Driven piles must
be avoided due to the adjacent school and other buildings. Fasteel Helical
Anchors or Auger Pressure Grouted Piles are the two most likely options,
installed to a depth of approximately 25 or 30 feet.
Per the project geotechnical report, the ground floor slab will be a supported
slab (thicker than a typical slab-on-grade and more heavily reinforced)
spanning between concrete girders and beams, supported on pile caps and
the piles noted above.
Consideration will be given to locating and constructing all piles for the
Addition Building D during the Addition Building C construction.
Alternatively, piles and piles caps along Addition Building C/D intersection
lines should be designed for future loads from Addition Building D.

The second floor structure will consist of a 3” normal-weight concrete slab
over 1-1/2” 20GA metal deck (assumed total depth of 4-1/2”) spanning
between 24” open-web steel joists spaced at 5’ on center and spanning from
exterior to the corridor. 18” open-web steel joists will span across the
corridor. The vibration performance for these joists is a concern and further
study will be required.
The roof structure will consist of a 2” normal-weight concrete slab over 1-1/2”
20GA metal deck (assumed total depth of 3-1/2”) spanning between 20”
open-web steel joists spaced at 5’ on center and spanning from exterior to
the corridor. 18” open-web steel joists will span across the corridor.
Additional structural steel wide-flange beams will be required at the roof to
support mechanical units and chimneys (see below for further discussion).
The lateral system will consist of steel braced frames. Transverse frames will
be located at selected classroom dividing walls. Longitudinal frames will be
located along the interior corridor wall, and oriented to allow doors for
classroom access. Narrow braced frames (configured to allow large extents
of unimpeded glass windows) or moment frames may be required along the
building north elevation.
A lateral joint of approximately 2” to 3” at the interface with existing Building
B is required. The joint will occur at floor and roof slab levels as well as at
exterior walls, with architectural joint covers used to bridge the joints.

Superstructure:
The primary structural system will consist of structural steel columns
supported on a deep foundation. Steel wide-flange girders will span
between steel columns to create a grid of structural bays.


Building Codes:
International Building Code (IBC) 2006 per Washington DC current
requirements.
ASCE7-05 “Minimum Design Loads for Buildings and Other Structures” as
referenced in IBC 2006
Live Loads (psf = pounds per square foot)
1. Classrooms = 40 psf
2. Corridors above first floor = 80 psf
3. First-floor corridors = 100 psf
4. Lobbies = 100 psf
5. Stairs = 100 psf
6. Roof = 20 psf or snow load


Building C, Addition:

D5
2.June.2013


ISTUDIO

Non-Structural Elements:
Exterior walls are expected to consist of cold-formed steel (metal stud)
framing with large extents of glass. At heavier brick cladding (potentially
along the north face of the building to match the existing structures),
masonry backing walls may be used.
Two or three solar chimneys are expected to be located at the roof,
constructed of a structural steel angle braced frame and clad with coldformed steel “furring” and architectural finishes. The chimneys are expected
to be squares with sides of 2’ to 3’ and extend approximately 10’ above the
roof level.
New mechanical units will be located at grade, not on the roof of Building C.
The majority of the remaining roof area will be a green roof. At present the
green roof system is assumed to weigh approximately 40 pounds per square
foot (psf).
At the building’s south elevation, a perforated metal panel solar screen is to
be constructed. The screen would be supported by a structural steel frame
cantilevering out at floor and roof levels of the building. Thermal
isolation/break would be provided by using bolted connections and a
product similar to Fabreeka’s Thermal Insulation Material.
New open stairs are to be constructed at the west end of the addition.

Building Codes:
See Building C, above. Slight modifications may be required as the local
authority having jurisdiction prepares to move to a new version of the IBC.
Foundations:
Similar to Addition Building C, the new building is expected to be founded on
deep foundations (see above for further information)
Similar to Addition Building C, the ground floor will require a supported slab
(see above for further information).
Consideration should be given to the interface between Addition Building C
and Addition Building D with respect to prior design consideration of Addition
Building D pile locations and design loads.
Superstructure:
The primary structural system is expected to consist of structural steel
columns supported on a deep foundation. Steel wide-flange girders will
span between steel columns to create a grid of structural bays.
The second floor structure will consist of a 3” normal-weight concrete slab
over 1-1/2” 20GA metal deck (assumed total depth of 4-1/2”) spanning
between open-web steel joists spaced at approximately 5’-0” on center. The
vibration performance for these joists is a concern and further study will be
required.
The roof structure will consist of a 2” normal-weight concrete slab over 1-1/2”
20GA metal deck (assumed total depth of 3-1/2”) spanning between openweb steel joists spaced at approximately 5’-0” on center.
Additional structural steel wide-flange beams will be required at the roof to
support mechanical units.
The lateral system will consist of transverse and longitudinal steel braced
frames, locations to be determined. Narrow braced frames (configured to
allow large extents of unimpeded glass windows) or moment frames may be
required along the exterior building elevations.


Alternatively, provided that minor settlement can be allowed for this patio, an
alternate system without deep foundations can be constructed. The process
is further described in the project geotechnical report, but can be
summarized as removal of approximately 2.5 feet of soil and replacement
with a geogrid mat and various of layers of graded stone up to the slab subgrade level.

Addition Building D:


Site Exterior Slab/Stair/Ramp
The proposed patio, stair, and ramp located between Addition Building C
and Addition Building D will be a concrete slab supported on concrete piles,
similar to the building ground floor slab, as described above.

D6
2.June.2013


ISTUDIO

Phase 1 Modernization:
No structural work anticipated.

No structural work anticipated.

Stairs at the northwest corner (adjacent to the new addition’s interior stair) of
Building B (constructed 1929) are expected to be infilled to create additional
floor space. Infill framing would consist of concrete fill on metal deck
spanning between steel beams anchored into the existing structure.
The roof structure (including attic space) of Building B may have capacity for
isolated light-weight units only. VRV cassettes will be supported at and
penetrate the existing plaster ceiling.
The existing mechanical unit located in the Building B attic directly below the
cupola is expected to be replaced with a DOAS (dedicated outdoor air
system) unit of approximately the same size and weight. The capacity of the
existing framing to support this load is to be verified.
A fan may be located at part of the cupola opening as part of the Phase 1
renovation, before the DOAS is added in a later phase.


“Non-Structural” Elements:
Exterior walls are expected to consist of cold-formed steel (metal stud)
framing with large extents of glass. At heavier brick cladding, masonry
backing walls may be used.

Due to the DOAS’ large dimensions, careful consideration should be given to
the method for placing it in the existing attic space. Assembling from smaller
components within the attic may be necessary and/or a new opening in the
gable end wall of the existing brick masonry may be provided. This opening
would likely be required as a louver in any case.
VRV condensers (approximately 6’ by 6’ and weighing 1500 pounds) may
need to be located at the roof of Building A (constructed 1959). It is
expected that the units could be located directly over concrete columns to
avoid the need for strengthening of the existing slab. Alternatively, steel
platforms could be constructed to span between existing concrete columns
and avoid loading the existing roof structure at all.
New openings through existing concrete floor and roof slabs should be sized
and located to avoid concrete joists.
New openings through existing hollow-clay tile partitions walls are also
possible, but may turn out to be troublesome due to the weak (and often
damaged) nature of these walls. Replacement of some or all of the walls (at
least at the 2nd floor where damaged) with new metal stud partitions may be
worth considering.
Careful study should be made as to the insulation of the existing brick walls
due to potential negative effects on masonry.


A lateral joint of approximately 2” to 3” at the interface with existing Building
B and with Addition Building C will be required. The joint will occur at floor
and roof slab levels as well as at exterior walls, with architectural joint covers
used to bridge the joints.

D7
2.June.2013


ISTUDIO


INTRODUCTION

equipment (see 2011 ASHRAE Handbook – HVAC Applications, Table 4 – this table is
provided in Appendix A of the present report); they should last ten more years.

Enclosed is the M/E/P/FP existing conditions assessment, design recommendations and
preliminary design information for the Powell Elementary School project. The existing
building consists of the original building built in 1929 and hereafter designated “Building B,
1929”, and a previous addition built in 1959 and hereafter designated “Building A, 1959.”

A louver located on the east side wall of the Boiler Room provides combustion air to the
room.

The existing building will be renovated following three phases of modernization. Two new
additions are planned. Building C, Addition is slated for construction at the same time as
existing building Phase 1 Modernization. Building D, Addition is expected to be built
during existing building Phase 3 Modernization.

2.1

The Boiler Room also houses three steam vacuum pumps (for steam/condensate return,
with one in stand-by), probably installed in 1959 (Photo M-5). Hot water is distributed to
Building A, 1959 using two hot water pumps (Photo M-4):

MECHANICAL
Existing Conditions
In assessing the condition of the equipment, the following four ratings (inspired from the
Facility Condition Index) are used: Good, Fair, Poor, and Unsatisfactory. General
equipment conditions are categorized as follows:
Unsatisfactory: Equipment has no useful life remaining and has to be replaced
immediately.
Poor: Equipment has minimal useful life remaining, due to extreme age, wear, or
insufficient maintenance. Failure or unreliable operation can be expected, or is
already occurring.
Fair: Equipment is generally well maintained, and can be expected to operate
reliably throughout its remaining service life.
Good: Equipment is well maintained, and can be expected to operate reliably
beyond its remaining service life.

2.1.1

Manufacturer: TACO;
Model: FE2007E2B1E2L0A;
Capacity: 125 GPM;
Head: 38 ft.;
Motor size: 2 HP;
Manufacture Date: 1996.
All pumps appear to be in fair condition.
Finally, the steam piping to the radiators in Building B, 1929 appears to be in poor
condition. The hot water piping to the unit ventilators and convectors in Building A, 1959
appears to be in fair condition.

Heating Systems
The buildings are heated with steam and hot water produced in a Boiler Room located in
the basement of Building B, 1929 (Photo M-1). Steam and hot water are distributed to the
building systems through piping in a crawl space adjacent to the Boiler Room (Photo M-2).
Steam is produced by two dual-burner (natural gas, fuel) steam boilers (Photo M-3) whose
characteristics are:
Manufacturer: A.L. Eastmond & Sons Inc.;
Model: FST 70;
Serial: 8512 for one, and 8513 for the other;
Gross output: 2,343 MBH each;
Combustion efficiency: 80%;
Steam pressure: 15 psi (characterized as low-pressure steam).

Photo M-1: Boiler Room

Photo M-2: Steam and Hot Water Piping
Distribution in Crawl Space

These boilers were not in operation at the time of survey, but appear to be in fair condition.
They were manufactured in 1996, and based on a median service life of 25 years for such
2.June.2013



2.

Hot water is produced from the steam with a Hot Water Converter, which is a heat
exchanger with steam on one side, and water on the other side (Photo M-6). The
converter was probably installed in 1959, with the previous addition. It produces about 76
GPM of hot water, at around 20oF Delta, which is equivalent to a capacity of about 760
MBH. This hot water converter appears to be in fair condition.


1.

D8

ISTUDIO

Photo M-7: Window AC Unit in Cafeteria/Gym

Photo M-5: Vacuum Pumps

2.1.2

2.1.3

Cooling Systems
Throughout the buildings, all cooling is done using window AC units (about 2 tons each).
Most units (Photos M-7 to M-10) are of make Friedrich, some are from Frigidaire, and
some are from Comfort Aire (Aitons). These units were probably installed starting from
2008, and appear to be in good condition.

Photo M-8: AC Unit in Cafeteria/Gym

Photo M-9: AC Unit in Cafeteria/Gym

Photo M-6: Hot Water Converter


Photo M-4: Hot Water Pumps

Photo M-10: AC Unit Plate

Air-Side Systems
The classrooms are provided with steam radiators in Building B, 1929 and unit ventilators
(Photo M-11) in Building A, 1959. The unit ventilators are connected to openings on the
side walls for ventilation (Photo M-12). Due to the nature of its heating systems, Building
B, 1929 receives no mechanical ventilation during the heating season. Cooling is provided
by AC window units for all classrooms. Exhaust fans (of make Broan) with wall switch
control are located in toilets of Pre-K and Kindergarten classrooms.
There is no direct ventilation in the corridors. Also, they do not receive air conditioning
(Photos
M-13 and M-14), except on perimeter walls (Photos M-15 and M-16).


Photo M-3: Steam Boiler

D9
2.June.2013


ISTUDIO

Restrooms are heated through radiators and convectors (Photos M-17 and M-19). They
are exhausted through two fans located in the attic for Building B, 1929 and two fans in
roof for Building A, 1959 (Photos M-18 to M-21).
The overall condition of the air-side systems is fair.
Additionally, there exists a natural ventilation system in Building B, 1929, with openings in
classrooms (Photo M-22) ducted to the attic (Photo M-23) where a large fan (Photo M-24)
rejects the air drawn from the classrooms to the exterior through the cupola. However, the
fan is no longer working.

Photo M-17: Steam Radiator in Building B,
1929 Restroom

Photo M-20: Louver Door in Building A, 1959
Restroom

Photo M-12: Ventilation Opening for Unit
Ventilator

Photo M-14: Corridor in Building A, 1959


Photo M-13: Corridor in Building B, 1929

Photo M-18: Exhaust Grille in Building B,
1929 Restroom

Photo M-19: Convector and Exhaust Fan in
Building A, 1959 Restroom

Photo M-11: Unit Ventilator in Classroom

Photo M-16: Unit Ventilator in Building A,
1959 Corridor


Photo M-15: Steam Radiator in Building B,
1929 Corridor

D10
2.June.2013


ISTUDIO

The warming kitchen is heated with a steam radiator and cooled with a window AC unit
(Photo M-25). An exhaust fan is dedicated to this room (Photo M-26).

Photo M-22: Opening in Classroom to Attic
for Natural Ventilation
Photo M-25: Window AC Unit in Kitchen

Photo M-26: Exhaust Fan in Kitchen

HVAC System Options
Various options are available. They are described below. All the options assume that
perimeter heating is provided by the existing radiators (converted to hot water radiators)
and hot water convectors in the existing buildings. To that effect, the steam piping in
Building B, 1929 will be replaced with new hot water piping.

2.2.1

D.C. Public School Design Guidelines and LEED Scorecard
The recommended mechanical system will be designed in accordance to the D.C. Public
School guidelines and design parameters as summarized in the following table.
Table M-1: DCPS Guidelines and Design Parameters

Item
#

2.1.4

Photo M-24: Fan in Attic for Natural
Ventilation in Building B, 1929 Classrooms

Administration and Support Areas
All administration and support areas, and the lobby are heated with radiators/convectors
and cooled with window AC units. As a result, there is no mechanical ventilation in the
heating season.

2.1.5

Winter Temperature
Summer
Temperature
Humidity

3

Air Changes
Outdoor Air
Ventilation

Cafeteria/Gym

Design Parameters
68.5oF to 75.5oF
74oF to 80oF
30% to 60% Relative
Humidity
6 to 10 per Hour

Parameter Notes
EPA 2000 & ASHRAE 55-04
EPA 2000 & ASHRAE 55-04
ASHRAE

6
7

Air Filtration
Carbon Dioxide
Levels
HVAC Background
Noise Level

10 CFM per Person

+ 0.12 CFM/ft2 of Area

MERV 13

4
5

The cafeteria/gym is approximately 2,400 square feet and is currently heated with steam
radiators and cooled with window AC units (Photo M-7). Here also, there is no mechanical
ventilation in the heating season.
2.1.6

1
2

Photo M-23: Shaft in Attic for Natural
Ventilation in Building B, 1929 Classrooms

Category

LEED
ASHRAE 52.2-2007 &
ASHRAE 62.1-2007

MERV 6 to 8
Below 700 PPM Above
Outdoor Air

ASHRAE 62.1-2007

RC(N) Mark II Level of 37

ASHRAE Handbook Chapter
47

Warming Kitchen


2.2


Photo M-21: Exhaust Fans in Building A, 1959
Roof

D11
2.June.2013


ISTUDIO

The LEED credits achievable for the school Additions with this type of system are listed in the
following table, which is based on experiences with renovations and new constructions that the
design team has accrued while working on D.C. Public School projects and other projects that
sought LEED certification.

Simplicity: Heating, cooling and ventilation achieved from RTU located on roof and
associated VAV terminal units for the Additions.
Minimal noise concerns: VAV terminal units located in corridor ceiling space away
from classrooms.
Historic character considerations: No openings on exterior walls of Building B,
1929 required.

Table M-2: Applicable “Mechanical” LEED Prerequisites/Credits

Achievable

Title

Y

N

?

N/A

Points
Possible

EAp2

Fundamental Commissioning of the
Building Energy System
Minimum Energy Performance

EAp3

Fundamental Refrigerant Management

Y

EAc1

Optimize Energy Performance

2

1 – 19

EAc3

Enhanced Commissioning

2

2

EAc5

Energy and
Atmosphere

Enhanced Refrigerant Management
Subtotals

IEQp1

Y

-

Y

-

1
4

-

1

-

22 of 33

IEQp3
IEQc1

Outdoor Air Delivery Monitoring

IEQc2

IEQc7.1

Increased Ventilation
Construction IAQ Management Plan –
During Construction
Construction IAQ Management Plan –
Before Occupancy
Controllability of Systems –
Thermal Comfort
Thermal Comfort - Design

1

1

IEQc7.2

Thermal Comfort - Verification

1

1

IEQc3.1
IEQc3.2
IEQc6.2

Subtotals

2.2.2

Ductwork distribution with VAV terminal units will require new ceilings in Building B,
1929.
Possible structural issues and increased costs for locating equipment on the roof
of Building A, 1959.
Higher first cost versus Option 2.
Equipment may be visible on roof with possible historic concerns.
Less efficient than Options 3 and 4.

1

Minimum Indoor Quality Performance
Environmental Tobacco Smoke (ETS)
Control
Minimum Acoustical Performance

IEQp2

Indoor
Environmental
Quality

Disadvantages

-

EAp1

Y

-

Y

-

Y

1

2.2.3

Install new four-pipe unit ventilators (UV) with hot water and chilled water coils or new twopipe UV’s. Retain existing window AC units for cooling. Chiller and chilled water
distribution to be installed with Addition.

1

1

1

1

Advantages

1

1

1
1

4

2

Least expensive option.
Ductwork distribution system not required.
Simultaneous cooling and heating capability if four-pipe system.
Minimal disruption: Can be installed one classroom at a time.
Easily adaptable with existing heating systems and also future master plan central
cooling and heating plant.

1

1

-

7 of 19

Disadvantages
Must use existing window AC units for cooling until future chilled water system is in
place.
Ventilation air openings similar to Building A, 1959 will be required for new UV’s at
Building B, 1929: Possible historic character issue.
Noisier compared to units located outside of space.

Option 1: Variable Air Volume Rooftop Units
Packaged air-cooled direct expansion VAV rooftop units (RTU) with either gas or hot water
heating in the unit serve the buildings. One unit serves the Additions; and there may be
two separate units serving Building B, 1929 and Building A, 1959, or a single larger unit
serving both buildings. The VAV boxes (located in corridors) will be fan-powered with hot
water or electric heat to handle all the heating loads in the Additions, and the remaining
heating loads in the existing buildings. This option assumes that new ceilings will be
installed in Building B, 1929. The rooftop unit(s) serving the existing buildings will be
located on the flat roof of Building A, 1959.
Advantages
Less maintenance: All air system (no additional boiler(s), pump(s) required).

Option 2: Unit Ventilators

2.2.4

Option 3: Variable Refrigerant Volume and Dedicated Outdoor Air System
Install new Variable Refrigerant Volume (VRV) systems using condensing units with
simultaneous heating/cooling capability. Condensing units will be mounted on flat roof of
Building A, 1959 for service to the existing buildings. Install Dedicated Outdoor Air
Systems (DOAS) on flat roof of Building A, 1959 and/or utilize Building B, 1929’s attic
space and existing vent shafts for service to the existing buildings. Condensing units and
DOAS for the Additions will be installed on the roof of the same. Supplemental heating in
the Additions will be electric.


Prerequisite/
Credit


Credit
Category

D12
2.June.2013


ISTUDIO

Powell Elementary School Approved Schematic Design (June 2, 2013)

Powell Elementary School Approved Schematic Design (June 2, 2013)

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