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> ' '»\y- • ' •vvvNAT'L INST. NRSIR OF STAND & TECH 83-2650

AU.1.0S TA37M0

ASBESTOS SURVEY OF THE

FEDERAL BUILDING AND

COURT HOUSE AT

450 GOLDEN GATE AVENUE,

SAN FRANCISCO, CALIFORNIA

FEBRUARY 1983

o3-2S50

snter for Building Technology

ational Bureau of Standards

epartment of Commerce

/ashington, D.C. 20234

0X3^

Office of Design and Construction

Public Buildings Service

General Services Administration

Washington, D.C. 20405
}
NBSIR 83-2650

ASBESTOS SURVEY OF THE FEDERAL

BUILDING AND COURT HOUSE AT

450 GOLDEN GATE AVENUE,

SAN FRANCISCO, CALIFORNIA

James H. Pielert

U.S. DEPARTMENT OF COMMERCE

National Bureau of Standards

National Engineering Laboratory

Center for Building Technology

Washington, DC 20234

February 1 983

Prepared for: Public Buildings Service

Office of Design and Construction

General Services Administration

Washington, DC 20405

U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director

NATIONAL BUREAU' OF STANDARDS

LIBRARY FEB 7 1983

Errata Sheet

NBSIR 83-2650

Asbestos Survey of the Federal Building and Court House

at 450 Golden Gate Avenue, San Francisco, California

James H. Pielert

page 4 Section 3.1, first paragraph, change "Myers" to "Meyer".

page 4 Section 3*1, third paragraph, second sentence

Replace with "Bulk samples were taken by collecting the loose fire

proofing into sample containers with screw-on lids."

page 4 Section 3.1, fourth paragraph, first sentence

Change "chryostile" to "chrysotile".

page 5 Third paragraph, change "module" to "modular".

page 5 Fifth paragraph (Boilers), change "a" to "provide".

page 11 Section 4., first paragraph

Change "Myers" to "Meyer".

page 12 Third paragraph, second sentence

Insert "a" between "of" and "fire".

page 21 (a) Definitions, change "chryostile" to "chrysotile".

page 21 (b)(2), change "an" to "any".

page 23 Section 4.2.4, first sentence

Replace with "A total of 51 air samples were taken in the building

on 13 of the 20 floors."

page 23 Section 4.2.5, first sentence

Change "Buildings" to "Building".

page 23 Section 4.2.5, second sentence

Replace with "The highest fiber levels were found in Room 15219

where a space modification was underway; 0.03 f/cc in the center

of the room and measurements of 0.02 f/cc and 0.04 f/cc from

personal samples on GSA employees working in the room. -I'

page 29 Option 5, Cost

Change $81,000 to $81,600.

page 29 Footnote, change "chrysolite" to "chrysotile".

page A-13 Delete "for" from figure title.

(over)
page B-1

page B-1

page B-1

page C-2

page C-2

page C-2

page C-3

page C-4

Sample I.D. 3» change "Chrysolite" to "Chrysotile".

Sample I.D. 3

Add "5/t Non-fibrous" under results.

Footnote 2, change "dryness" to "drying".

Change "SAN 8012" to "SAN 9012".

Change "760" to "<760" under Total Fibers per Filter for SAN 9012.

Change "SAN 8013" to "SAN 9013".

Change "2212" to "15219" under Room # for Sample SAN 9028.

Add following preceding Sample #SAN 0038

Sample #

Room #

Location (Area)

No. of Fibers

Counted per

100 fields

SAN 0037

15205

International Trade Administration

(top of file cabinet)

2

AIR 3054

Total Fibers

per Filter

Fibers per <0.01

cc of air

Comments Across from CSA Space Mod. Proj.
ABSTRACT

The report describes a study conducted by the National Bureau of Standards for

the Public Buildings Service of the General Services Administration on the use

of fireproofing suspected of containing asbestos in a Federal building. The

report presents the results of physical inspections of selected portions of

the building, application of bulk and air sampling techniques, and includes

asbestos abatement options that GSA may wish to consider for reducing airborne

asbestos fiber levels in the building.

Key words: asbestos; buildings; fireproofing; structure.

iii
TABLE OF CONTENTS

Page

ABSTRACT ill

1. PURPOSE OF STUDY AND APPROACH 1 2. BACKGROUND INFORMATION 2 3. PRELIMINARY INSPECTION 4

3.1 Scope 4

3.2 Description of the Building 4

3.3 Description of Fireproofing 9

3.4 Results of Preliminary Inspection 9

4. SECOND ON-SITE INSPECTION 11

4.1 Walk-Through Survey 11

4.2 Air Sampling 21

4.2.1 Guidelines for Exposure Levels 21

4.2.2 Selection of Method of Measurement 22

4.2.3 Sampling Procedures 23

4.2.4 Sampling Locations 23

4.2.5 Air Sampling Results 23

5. SUMMARY AND FINDINGS 25

6. OPTIONS FOR GSA CONSIDERATION 26

APPENDICES

A. PHOTOGRAPHIC DOCUMENTATION OF PRELIMINARY INSPECTION A.

B. ANALYTICAL RESULTS OF BULK SAMPLES B.l

C. SUMMARY OF AIR SAMPLING LOCATIONS AND RESULTS C.l

D. ANALYTICAL RESULTS OF AIR SAMPLES D.l

E. DETAILS SHOWING METHOD OF DUCTING AIR RETURN SYSTEM AND INSTALLATION

OF HIGH EFFICIENCY FILTERS E.l

iv
1. PURPOSE OF STUDY AND APPROACH

The National Bureau of Standards (NBS) performed a study on the use of

fireproofing suspected of containing asbestos in the Federal Building and

Court House at 450 Golden Gate Avenue, San Francisco, California (henceforth

referred to as the Federal Building) for the Public Buildings Service (PBS) of

the General Services Administration (GSA). This particular building was selected for study by GSA.

The specific objectives of this project were to: (1) conduct a physical

inspection of selected portions of the building, (2) conduct limited sampling

activities, and (3) identify asbestos abatement options that GSA may want to

consider in reducing airborne asbestos fiber levels in the building. The

scope of this study was limited due to funding and time constraints and it was not possible to conduct an inspection of the entire building. The conclusions and options provided were developed within these limitations and it is

recommended that a more in-depth study be conducted prior to implementation

(see sections 5.0 and 6.0).

The approach used in this project was as follows:

A. conduct preliminary inspection of the Federal Building to gain knowledge

of the construction types, physical condition of asbestos-containing material in selected areas, and collect related information needed for

planning a more in-depth follow-up visit;

B. conduct follow-up inspection of the Federal Building, including the use of

sampling techniques!/ , which may help define the level of airborne asbestos

fiber contamination; and

C. summarize findings and identify options for GSA consideration which will

reduce airborne asbestos fiber levels in the Federal Building.

Each of these will be discussed in detail in sections 3.0 through 6.0.

U See section 4.2.2 for the rationale for the

microscopy as the method of measurement for

selection of phase contrast

air samples.

1
2. BACKGROUND INFORMATION

The concentration level of asbestos fibers present at any given time in a building which has sprayed asbestos-containing material is dependent on three

generating mechanisms. These are discussed in the following paragraph taken

from a NAVY publication^/ and are illustrated in figure 1.

"Circumstances that result in asbestiform fibers becoming airborne

include fallout, impact, and reentrainment. Fallout is considered to

be a result of aging and degradation of the bonding agents in an asbestos-containing material. Fallout is usually low level, continuous, and may increase with the age of the structure. It represents

a source of fallen fibers which may accumulate over periods of time.

Impact with asbestos-containing material may be intentional, accidental,

capricious, or destructive. Specific actions include striking, cutting,

or penetration of the material. Such contact disturbs the integrity of

the matrix and results in fiber dissemination. Most friable forms of

asbestos-containing material are readily susceptible to such damage

or disturbance. Even spraying friable surfaces with sealants or paints

causes fiber release. Reentrainment of fallen debris and asbestos dust

by custodial activities such as dusting o_* sweeping will resuspend

accumulated fibers in the atmosphere. Generally, the reentrainment

effect is proportional to the level of activity in the facility."

1/ Management Procedure for Assessment of Friable Asbestos Insulating Material , Technical Report R883 , Civil Engineering Laboratory, Naval Construction

Battalion Center, February 1981.

2
MODE CAUSES FREQUENCY FIBER RELEASE RATE

FALLOUT/

EROSION

AIR MOVEMENT,

VIBRATION,

DETERIORATION

CONSTANT LOW

IMPACT MAINTENANCE,

ACCIDENTAL

IMPACT

OCCASIONAL HIGH

SECONDARY

DISPERSAL

USUAL ACTIVITY

CUSTODIAL

SERVICE

FREQUENT LOW TO HIGH

Figure 1. Mechanisms for generating airborne asbestos levels!/

-i/ Taken from Management Procedure for Assessment of Friable Asbestos

Insulating Material , Technical Report R883, Civil Engineering Laboratory,

Naval Construction Battalion Center, February 1981.

3
3. PRELIMINARY INSPECTION

3.1 SCOPE

A preliminary visit was made to the Federal Building during the week of

January 25, 1982 by NBS staff and an industrial hygiene consultant to NBS

(A. F. Myers and Associates, Inc., McLean, Virginia).

Meetings were held with GSA personnel to discuss the use of asbestos-containing

material in the building, the history of asbestos related activities such as abatement actions taken, proposed building modifications (e.g., installation of

fire sprinkler system, new lighting system), and to review the structure and

layout of the building. A visual walk-through survey of representative locations in the building was then conducted to assist in evaluating the overall

extent and physical condition of suspected asbestos material and to evaluate

building systems such as the heating, ventilating, and air conditioning (HVAC)

system which may effect asbestos fiber distribution. Appendix A contains

photographic documentation of this survey.

Bulk samples were taken in four areas of the building where damaged fireproofing

was found for determining the type and quantity of asbestos present. Bulk

samples were taken by collecting the loose fireproofing into a sample container

with a screw-on lid. A fifth sample was taken from a fiberglass air filter in an outside air supply chamber to test for the presence of trapped asbestos

fibers

.

For the four bulk samples of loose fireproofing, one sample contained 35 percent

chrysotile asbestos by weight and the other three samples were in the range of

5-10 percent chryostile. The sample with 35 percent chrysotile was taken from

fireproofing lying on top of ceiling tiles in the corridor between rooms 8440

and 8450. There were no asbestos fibers detected on the air filter which was sampled. These results indicate that the asbestos content of the fireproofing

is not uniform in the building. Appendix B contains locations where samples

were taken, method used to analyze the samples, and results. However, because

of the limited number of bulk samples taken, it is not possible to extrapolate

the results to the entire building.

3.2 DESCRIPTION OF THE BUILDING

The Federal Building is located at 450 Golden Gate Avenue, San Francisco,

California; construction was started in 1961 and completed in 1964. It is a multiple use building with office space for many U.S. government agencies.

Building tenants include: Departments of Justice, Labor, Housing and Urban

Development, and Interior; Federal Bureau of Investigation; Internal Revenue

Service; Drug Enforcement Administration; Congressional Offices; Federal

District Courts; and other Federal agencies. Approximately 4,500 people work

in the building.

The building consists of approximately 1,250,000 gross square feet and 1,000,000

net square feet of usable space. The building at grade is approximately 50

4
ft (15.24 m) above sea level and is twenty (20) stories in height with a basement and sub-basement.

The geographical location of the building has a winter outdoor design temperature

of +40°F and a summer design outdoor temperature of 74°F dry bulb and 63°F wet

bulb. The degree days for heating are 3000 and full load cooling hours are approximately 400.

The building is a steel frame structure with composite floors constructed of

light gage steel deck and cast-in-place concrete. The deck used was a standard

structural deck with built-in wireways but no air movement cells. A schematic

cross-section drawing of typical floor construction is shown in figure 2.

The lay-in ceiling lighting system installed in the finished spaces in the

building is a 5 ft (1.52 m) long module type with pendant mounted standard GSA

fluorescent light fixtures of the two-tube type. Some are 2 ft (0.61 m) and

others are 4 ft (1.22 m).

The HVAC system is a four-pipe system consisting of six separate air handling

systems providing air flow to all spaces in the building. The air handling

systems are such that four of these systems feed down from the twentieth floor

to the ninth and two systems feed up from the basement areas through the eighth

floor. These systems are dual duct systems with separate steam heating coils

and chilled water cooling coils in each system with duct mixing boxes as the

terminal units. The system has the ability to cool or heat at any time that

the air handling units are running. The portions of the HVAC system observed

were consistent with the building drawings. A schematic drawing of a typical

air handling system for occupied office areas is shown in figure 3.

Boilers - The boilers are fired by natural gas, and there are three of these

boilers providing heat to all the air handling units as well as a make-up for

domestic hot water and other uses.

Chillers - There are three centrifugal-type chillers providing cooling.

Cooling Towers - There are two wooden cooling towers on the roof of the building

providing a source of heat rejection necessary for the chilled water system.

Courtrooms - Each courtroom has a separate air handling unit which is in the

penthouse and feeds down to the courtrooms. The returns for these courtrooms

are duct-connected to the main return air ducts.

The return air systems consist of a series of ceiling diffusers placed on a modular basis throughout office spaces and are open to the plenum above through

a small sound attenuation chamber. Air that is supplied to the room through

supply type diffusers goes back up into the plenum through these return air

diffusers (figure 4). Return air is not ducted through the plenums where fireproofing coats the structural steel and the underside of the floor deck. There

are also small slots at each window to take the downdraft from the glass and

feed back into the return system. The latter portion of the system is duct

connected and this air does not return through the open plenum.

5
6

Figure

2.

Schematic

of

typical

composite

steel/concrete

floor

construction
OUTDOOR AIR

Figure 3. Schematic of typical air handling system

7
Figure 4. Air return diffusers with sound attenuation collar in ceiling

above typical occupied space

8
3.3 DESCRIPTION OF FIREPROOFING!/

Fire protection of the structural steel members and the composite steel deck

was obtained by a coating of fireproofing approximately 2 in (50.8 mm) in thickness. Where bulk samples of the fireproofing were taken, the fireproofing was found to contain asbestos. The fireproofing was oversprayed with a sealant to

hold the fireproofing material in place. The initial sealant spray used was clear in color; later a blue pigment was added so application of the sealant

could be verified by inspectors. Most areas observed showed the blue overspray.

The fireproofing is typically located above finished ceilings except where it

is exposed in elevator machine rooms, telephone rooms, electrical closets, and

other infrequently inhabited spaces. Appendix A illustrates the various applications of fireproofing and typical conditions encountered during the visual

inspection. Most locations observed indicated a uniform application of fireproofing although some locations were observed where the application was uneven

with the thickness varying between 1 in (25.4 mm) to over 3 in (76.2 mm).

Visual examination indicated that the fireproofing was generally well adhered

except in areas where damaged during building modifications. As defined by

ERA!/, the fireproofing was friable to the touch in that it could be "crumbled,

pulverized, or reduced to powder in the hand." In some locations, pieces of

fireproofing were observed lying on top of the tiles in the ceiling plenum.

Such loss of fireproofing may have altered the design fire rating of structural

beams and deck.

3.4 RESULTS OF PRELIMINARY INSPECTION

Based on the results of the preliminary inspection of the Federal Building

discussed above, a more detailed follow-up study was recommended by NBS,

including the following aspects:

1. An extensive walk-through inspection of typical areas of the building.

2. Use of an air sampling strategy to determine the asbestos content of the

air during normal building activities.

3. Additional documentation of critical findings by photographs at locations

where considered necessary.

!/ It should be emphasized that only a very small portion of the Federal

Building was visually inspected; therefore, it is not possible to apply the

observations noted to the entire building.

2/ Asbestos-Containing Materials in School Buildings: A Guidance Document-Part

U.S. Environmental Protection Agency, March 1979.

9
4. Additional fact-finding interviews with personnel involved with the initial

building construction and GSA building maintenance and operations staff to

ascertain facts regarding the actual construction materials and systems

used in the building.

5. Identification of options for GSA's consideration which could be used to

reduce airborne asbestos fiber levels in the Federal Building.

10
4. SECOND ON-SITE INSPECTION

Based on the results of the preliminary inspection, a detailed study plan

was designed to achieve the objectives of the project. The Federal Building

was revisited during the week of June 28, 1982 by staff of NBS and A. F. Myers

and Associates (two Industrial Hygienists and a Mechanical Engineer). The

following tasks were conducted:

A. a visual walk-through survey to select areas representative of

typical building activities,

B. physical inspection of selected areas including two general office

spaces, a courtroom, a mechanical room, the lobby, the penthouse,

the main food service facility, the health clinic, and several

representative areas where fireproofing was not enclosed behind

ceilings, walls, etc.,

C. fact-finding interviews with GSA building maintenance and

operations staff to ascertain additional facts about the building's

construction and information pertaining to the selected areas,

D. determination of outdoor airborne fiber levels_L/ by air sampling in an air intake chamber of the HVAC system,

E. application of an air sampling strategy to assist in determining

airborne fiber levels during normal building activities,

F. air sampling for fibers in representative locations in the ceiling

return air plenum to ascertain fiber movement by the HVAC system,

G. determination of sample fiber concentrations in the air from selected

areas where GSA maintenance and operations staff are engaged in work

which may involve direct contact with materials containing asbestos, 2J

and

H. documentation of findings by photographs at locations where

considered appropriate.

4.1 WALK-THROUGH SURVEY

Prior to the second visit to the building, plans, specifications, and space

assignment drawings obtained during the preliminary visit were used to select

representative areas of typical building activities for further evaluation.

JJ Fibers detected by phase contrast microscopy may or may not be asbestos

(see section 4.2.2).

2/ The area sampled where renovation work was in progress did not involve

direct contact with the fireproofing (see section 4.2.3).

11
A general floor-by-floor visual walk-through was conducted to select locations

for subsequent detailed inspection and air sampling in (1) typical building

areas, (2) areas where fireproofing damage was noted, and (3) an area where a major renovation project was in progress- The renovation area selected was Room 15219, vacated space once occupied by the Community Services Administration (CSA). This large space and a few adjacent offices were being altered

for new tenants and the entire ceiling had been removed. This area and the

exposed ventilation system were studied and the existing return air duct

system was checked against the as-built drawings. Electrical work was in

progress during the inspection and air sampling activities.

Figure 5 shows the air plenum area in Room 15219 with the suspended ceiling

removed. Damage to fireproofing can be seen in figure 6 (addition of piping),

figure 7 (addition of wall partitions), and figure 8 (addition of pipe hanger

to beam flange).

Ceiling tiles were lifted in several areas of the building and the condition

of the fireproofing noted. Figure 9 shows dislodged fireproofing remaining on suspended ceiling tiles after installation of fire sprinkler system adjacent to

the Drug Enforcement Administration (Rooms 8440 and 8450).

Representative portions of the existing HVAC system throughout the building

were inspected including mechanical rooms, air plenums, control rooms, fan

rooms, etc. An evaluation was performed on the potential contribution made

by the HVAC system to circulation of airborne fibers. The inspection of the

return air duct system in Room 15219 showed that the existing system was con- structed as depicted on the as-built drawings. Air is supplied to rooms through

ceiling diffusers and returns to the open plenum through air diffusers located

in the ceiling cavity (figure 4). The air then proceeds to open end return

air ducts (figure 3) above the ceiling and then back to the air handling system

via high velocity return air shafts. The high velocity shafts were visited at

night while the HVAC system was not operating to determine the locations of

exposed fireproofing and extent of damage These shafts contain structural

steel members coated with fireproofing that are subject to high velocity air

flow. Figure 10 shows pieces of fireproofing lying on the catwalk in the east

end high velocity return air shaft (Room 13114 accessway). Dislodged pieces

of fireproofing were observed lying on top of tiles in the ceiling return air

plenum. This material was observed falling to the space below when these

tiles were removed for access to the ceiling cavity. Fireproofing on steel

members in the main kitchen area illustrated both natural deterioration

(figure 11) and effects of physical damage (figures 12 and 13).

Fan rooms were examined to determine the type of air filtration system used.

The filters used in the HVAC system are roll type filters. Telephone closets,

elevator machine rooms, and electrical closets were checked on each typical

floor for fireproofing applications.

12
Figure 5. Air plenum area in Room 15219 with the suspended ceiling

removed. (Note arrow pointing to open air return duct

which collects return air in the open plenum)

Figure 6. Damage to fireproofing due to renovation of plumbing

system in Room 15219

13
Figure 7. Damage to fireproofing due to addition of partition

system in Room 15219

14
Figure 8. Damage to fireproofing due to addition of pipe hanger

to beam flange adjacent to Room 15219

15
Figure 9. Pieces of fireproofing remaining on suspended ceiling after

installation of fire sprinkler system (Rooms 8440 and 8450)

16
Figure 10. Fireproofing particles lying on the catwalk in the east end high

velocity return air shaft (Room 13114 accessway)

17
Figure 11. Naturally deteriorating fireproofing on structural members

in main kitchen storage Room 2212

18
Figure 12. Physical damage to fireproofing on beam in Main Kitchen Storage

Room 2212

19
Figure 13. Pieces of fireproofing on floor of Main Kitchen Storage

Room 2212

20
4,2 AIR SAMPLING

4.2.1 Guidelines for Exposure Levels

Specific guidelines are not currently available for occupant exposure to

airborne asbestos fibers in buildings having in-place materials containing

asbestos (fireproofing, insulation, etc.) that are not being disturbed by

maintenance, renovation, or removal activities. The U.S. Environmental

Protection Agency (EPA) is currently working on such guidelines for schools

which may have application to other public buildings.

The Occupational Safety and Health Administration (OSHA) has set the permissible

exposure level for asbestos fibers at 2.0 fibers longer than 5 ym per cc of

air (f/cc) on an 8 hour time-weighted average (TWA) basis for situations where

work in the building disturbs the in-place materials containing asbestos. 2/

This permissible level applies to all building occupants, including office

workers, maintenance and operation staff, and contractors. Additionally, OSHA

has set the level above which a medical surveillance program (physical

examinations) must be initiated at 0.1 f/cc on 8 hour TWA..?/

Specifically, section 1910.1001 of the OSHA regulations^/ states:

"(a) Definitions. For the purpose of this section, (1) "asbestos" includes

chryostile, amosite, crocidolite, tremolite, anthophyllite , and actinolite,

(2) "asbestos fibers" means asbestos fibers longer than 5 micrometers."

"(b)(2) Standard effective July 1, 1976. - The 8 hour time-weighted average

(TWA) airborne concentrations of asbestos fibers to which an employee may

be exposed shall not exceed two fibers longer than 5 micrometers, per cubic

centimeter of air, as determined by the method prescribed in paragraph

(e) of this section."

"(b)(3) Ceiling concentration. No employee shall be exposed at any time

to airborne concentrations of asbestos fibers in excess of 10 fibers,

longer than 5 micrometers, per cubic centimeter of air, as determined by

the method prescribed in paragraph (e) of this section."

"(e) Method of measurement. All determinations of airborne concentrations

of asbestos fibers shall be made by the membrane filter method at 400-450 x (magnification) (4 millimeter objective) with phase contrast illumination."

"Employee" is defined in section 1910.2(d) as: "'Employee* means an employee

of an employer who is employed in a business of his employer which affects commerce

.

U Code of Federal Regulations, Title 29, Part 1910.

2/ OSHA Instruction CPL 2-2. 21A, February 18, 1981.

21
4.2.2 Selection of Method of Measurement

Application of phase contrast microscopy, specified in section 1910.1001(e) of

Title 29, Code of Federal Regulations, as the method of fiber content measurement for air samples taken in an office environment which may have asbestos

contamination, may not be appropriate for the following reasons. Phase contrast

microscopy has limits on the fiber size range on which it can be used; only

particles having a length-to-width (aspect) ratio greater than 3:1 and a length

of 5 ym or greater are counted as fibers. 2/ Secondly, a study by the Mount

Sinai School of Medicine points out that fibers other than asbestos (e.g.,

cellulose, glass fibers) which are likely to be present in ambient air would

be counted as fibers by phase contrast microscopy. 2/ The report further states,

"In occupational circumstances, where the majority of fibers are indeed asbestiform, this procedure (phase contrast microscopy) has practical utility."

Finally, the measurement method would miss very thin asbestos fibers (<0.5 ym

in width). For these reasons, the application of phase contrast microscopy as a measurement method in an office environment is questionable.

Current literature on asbestos measurement indicates that electron microscopy

is the preferred method for the examination and identification of asbestos

fibers of all sizes. 2/ » 2/ In cases where the fiber size distribution falls

below 5 ym, phase contrast microscopy will produce a zero fiber count for a sample, but the same sample may have a significant fiber count when examined by

electron microscope. However, the cost of electron microscopy ($400 - $450

per sample) can be as much as 15 times greater than analysis by phase contrast

microscopy ($25 - $30 per sample).

While there are no EPA or OSHA guidelines for measurement of airborne

concentrations of asbestos fibers in public buildings where the asbestoscontaining materials are not being disturbed, it was decided for this study to

determine the fiber content of the air in the Federal Building based on the

measurement method (phase contrast microscopy) noted in OSHA 1910.1001(e) of

Title 29, Code of Federal Regulations. Limitations of phase contrast microscopy

discussed above will be considered in evaluating the results and identifying

asbestos abatement options. Electron microscopy was not used because of funding

limitations

.

2/ Management Procedure for Assessment of Friable Asbestos Insulating Material , Technical Report R883, Civil Engineering Laboratory, Naval Construction

Battalion Center, February 1981.

_?/ Asbestos Contamination of the Air in Public Buildings , William J. Nicholson,

et al., Mount Sinai School of Medicine, Sponsored by U.S. Environmental

Protection Agency, October 1975.

22
4 ,

2,3

Sampling Procedures

The Federal Building was inspected while there were no activities which would

disturb the asbestos-containing materials. Even in Room 15219, where a renovation was in progress, suspected asbestos-containing material was not being

intentionally disturbed during the air sampling period.

Air samples taken in occupied locations were collected in accordance with the

NIOSH Manual of Sampling Data Sheets, Sheet number 2, DHEW (NIOSH) Publication

No. 77-159. Portable DuPont Model P2500 and P4000 and Spectrex Model PAS 3000

sampling pumps were used with open-faced 37 mm, 0.8 micrometer pore size mixed

cellulose membrane filter cassettes for full work shift sampling. Pumps were calibrated as per the OSHA Industrial Hygiene Field Operations Manual, Volume

VI, Chapter VIII-9 using a bubble meter before and after each sampling period.

Air samples in unoccupied locations, such as electrical closets and machine

rooms, were collected using Millipore Catalog Number XX60-000-00 High Pressure

Vacuum Pumps and collection media as specified on the NIOSH asbestos sampling

data sheet. Pumps were calibrated as per the OSHA Industrial Hygiene Field

Operations Manual using a precision rotameter before and after each sampling

period. All air samples taken were collected on an 8 hour time-weighted average

basis.

4.2.4 Sampling Locations

A total of 51 air samples were taken in the building on 8 of the 24 floors. The

general office space sampled was Room 15205, occupied by the International Trade

Administration, U.S. Department of Commerce. It was selected because of its

close proximity to the ongoing major building modification project in Room

15219. Further samples were taken in other areas as deemed appropriate, such

as return air shafts, several ceiling return air plenum locations, and a second

general office space not near any project work (Room 7003). This office space

was chosen both because it was on a zone of the HVAC system different than

Room 15205, and it represented a typical office area of the building. Locations

and summary of air sample results are presented in appendix C and copies of

the reports are in appendix D.

4.2.5 Air Sampling Results

In summary, all air samples in the Federal Buildings were below the current

limit of 2.0 f/cc established by OSHA for permissible employee exposure to

airborne concentrations of asbestos fibers prescribed for occupational exposures

where asbestos materials are disturbed. The highest fiber levels were found in

Room 15219 where a space modification was underway; 0.01 f/cc in the center of

the room and measurements of 0.01 f/cc and 0.04 f/cc from personal samples on GSA employees working in the room.,1/ As discussed previously, these employees

1 / Personal samples were collected within the breathing zone of employees

for 8 hours.

23
were doing electrical work and were not intentionally contacting the

fireproofing.

In addition to the limitations of the selected measurement method, it must be

emphasized that because of the limited number of air samples, it is not possible

to extrapolate the results to the entire building.

24
5, SUMMARY AND FINDINGS

A. Fireproofing coats all structural steel and deck, including steel members

in the high velocity vertical air return shafts. Asbestos was present in

the fireproofing which was sampled.

B. There is evidence of damaged fireproofing, including dislodged material

lying on tiles in the ceiling air return plenum (see figure 9).

C. Air samples collected and analyzed according to OSHA regulations

(29 CFR 1910.1001) showed the presence of fibers below the current levels of

2.0 f/cc for airborne concentrations of asbestos fibers (see section 4.2.5).

However, the phase contrast microscopy method used to count fibers:

(1) cannot distinguish between asbestos and other fibers in ambient air,

(2) counts only fibers greater than 5 pm in length and with aspect ratios

greater than 3:1, and (3) cannot detect extremely thin (<0.5 ym in width)

asbestos fibers. Based on the data collected in this study, it is not

possible to quantify or extrapolate the level of airborne asbestos fiber

contamination in the Federal Building.

D. Improved measurement of the asbestos fiber content of air can be achieved

by the use of electron microscopy such as outlined in a provisional

methodology prepared by EPA.i/ »±/

Electron Microscope Measurement of Airborne Asbestos Concentrations: A

Provisional Methodology Manual , EPA Report No. 600/2-77-178, Environmental

Sciences Research Laboratory, U.S. Environmental Protection Agency, Research

Triangle Park, North Carolina, 27711, Revised June 1978.

2/ Evaluating and Optimizing Electron Microscope Methods for Characterizing

Airborne Asbestos , EPA Report No. 600/2-78-038, Environmental Sciences

Research Laboratory, U.S. Environmental Protection Agency, Research

Triangle Park, North Carolina, 27711, June 1978.

25
6. OPTIONS FOR GSA CONSIDERATION

The following options have been developed for consideration by GSA if they

deem it advisable to undertake a program to reduce the levels of asbestos

in the air of the Federal Building.

The costs given are "ballpark" estimates (+ 30 percent) and detailed design

must be conducted for determining specific costs of the options for asbestos

abatement in the building. Costs do not include associated costs of environmental controls (except asbestos removal), ceiling removal and replacement,

and restoration of the design fire ratings. The costs also do not include

expenses associated with relocation and operational disruption that may be

encountered in implementing these options.

It will be necessary to completely inspect the entire building, including all

remote spaces, to identify exposed fireproofing and its condition prior to

implementing the options given below for asbestos abatement and control. This

is required since the study discussed in this report included inspection of

typical areas only.

Option 1 - Duct-connect all existing ceiling return air diffusers to the open

ended return ducts in the air return plenum.

Discussion and Approach - The supply air from the central air handling system

enters each room via a supply air ceiling diffuser of the perforated metal pan

type located in the suspended ceiling. The air, after sweeping through the

room, is returned via a diffuser type air return also located in the ceiling

(figure 4). The supply air diffuser and the return air diffuser are of the

perforated face type and are nominally 12 x 12 in (305 mm) throughout the

building.

As the air passes through the return air diffuser, it enters an air plenum

above the ceiling. There is a system of open ended return-air ductwork above

this ceiling to pick up the return air and carry it to the return-air fans via

vertical air shafts as shown in figure 5 and appendix E (figure E.4). Each

ceiling return has a fiberglass box set over the top of it in the plenum for

sound attenuation (figure 4). The boxes were to provide room-to-room attenuation in cases where ceiling-high partitions are installed to create separate

rooms. The air passing through this plenum to the open ends of the return air

ducts comes in direct contact with the fireproofing on the structural steel

and deck and any that may have been dislodged and is lying on the ceiling

panels

.

In addition to the ceiling returns, there is a closed-duct system attached to

the sill of each window to sweep away cold down drafts that may occur in the

wintertime (appendix E, figure E.3).

Approach and Cost - The return air system can be duct-connected as shown in

appendix E, thus preventing the return air passing through the ceiling space

in contact with the fireproofing. This can be accomplished by attaching each

existing ceiling return to the existing return air duct system as shown. An

26
8 in (203 mm) round collar can be attached to the existing diffuser to connect

the in (203 uim) round flex duct as shown in figure E.l of appendix E. All

open-end return air ducts would have to be blanked off and volume dampers

would have to be inserted in branch ducts to allow the accomplishment of air

balance. Figures E.2, E.3, and E.4 show duct configurations for typical building locations. Some additional return ducts would also have to be added as indicated. After all returns are duct-connected, it would be necessary to have

an air balance contractor balance the entire return air system to appropriate

quantities in each room.

The cost of duct-connecting the returns is estimated to be $116.00 per return

and there are approximately 10,720 of these returns for a total estimated cost of

$1,243,520. Because of open office configuration, it may be possible to delete

some of the air returns in the final design. However, it should be recognized

that the space may later be converted to a compartmentalized layout.

Option 2 - Remove all dislodged fireproofing currently lying on top of ceiling

tiles and in other areas where fallout exists by High Efficiency Particulate

Absolute (HEPA)k/ filter vacuum cleaning equipment .

Discussion and Approach - Dislodged fireproofing in the ceiling plenum, if not

removed, may be a continual source of asbestos fibers as maintenance and operation work is carried out in the space as was discussed in section 2.0. Also,

material would fall into occupied space as ceiling panels are removed.

Cost - This can be accomplished as an independent operation or when the air

return system in the air plenum is ducted (Option 1) which would minimize

additional expenditure of money. If done separately, the actual cost of HEPA

vacuuming of ceiling tiles would depend on the total area of tile vacuumed

based on the results of the complete inspection of the entire building and

labor rates of personnel.

Option 3 - Provide ceilings in spaces closed off from the HVAC system where

fireproofing is exposed, including elevator machine rooms, electric closets,

telephone closets, and custodial closets.

Discussion and Approach - Certain rooms throughout the building do not have

ceilings and the fireproofing is exposed to the occupants of these rooms. Any

material dislodged in these rooms may fall on the floor or directly on the occupants. Installation of a ceiling in these rooms as shown in figure 14 is

considered to be feasible.

Approach and Cost - The cost of installing ceilings is estimated to be $10.00

per square foot average, and there is approximately 9,000 square feet for an estimated cost of $90,000.

U HEPA filters in conformance with ANSI Z9. 2-1971, "Design and Operation of

Local Exhaust Systems."

27
Section thru room showing method of installing ceiling where

fireproofing is exposed to room (electrical closets, telephone

closets and elevator rooms)

Figure 14. Method of installing ceiling where exposed fireproofing

is present

28
Option 4 - Cover all exposed fireproofing on steel structural members or walls

which is: ( 1 ) susceptible to damage., and/or (2) located in high velocity

vertical air return shafts.

Discussion and Approach - There are some areas where structural steel with

fireproofing is exposed such as the side walls in the upper elevator machine

room (appendix A, figure A. 17). In these cases, it is felt that the fireproofing can best be covered by attaching wire mesh and plastering over the wire

mesh with cement plaster as shown in figure 15. The amount of exposed steel

beams covered with fireproofing in the return air shafts is limited and should

also be covered in a similar manner.

Cost - The fireproofing on the steel can be covered at a cost of approximately

$10.00 per square foot of surface area of structural member. A detailed survey

of the building would be required to determine the total area involved.

Option 5 - Change existing HVAC filter banks to high efficiency types .

Discussion and Approach - The existing HVAC fan system is equipped with rolltype filters and it is recommended that these filters be changed to high efficiency type (95 percent on particles of 0.3 pm or greater) as shown in figure E.5

of appendix E.jL/

The location of the filters would stay the same. However, the filter frames

would have to be modified to accept 12 in (305 mm) thick filters. After the

completion of the installation of the high efficiency filters, the HVAC

system would require rebalancing since pressure drop through the new filters

would increase somewhat.

Cost - There is approximately 2,720 square feet of filter area and the cost of

installing the 95 percent efficiency filters is estimated to be $30.00 per

square foot of filter area, $30.00 x 2,720 = $81,000. This includes cost

of new filters, support frame, and replacement fan blower motors, if required.

Final design should consider the impact of such modifications on electrical

power system, motor design, and possible increase in noise in the HVAC system.

Adequate maintenance of these filters must be considered.

Option 6 - Remove fireproofing only in areas where heavy physical damage has

occurred , such as in areas of the Zone 3 Elevator Hoisting Room (appendix A,

figure A.7). Specifically , fireproofing should be removed only in areas where

damaged .

Discussion and Approach - Removal of heavily damaged fireproofing should be done

by a qualified contractor under prescribed environmental controls and in accordance with EPA 40 CFR, Part 61, OSHA 29 CFR 1910.1001, and applicable State

and local regulations. Additional study will be required to identify areas

J/ These filters will not remove all asbestos fibers since chrysolite fibers

have a minimum thickness of 0.02 to 0.03 pm.

29
CEMENT PLASTER

STRUCTURAL

STEEL

EXISTING

FIREPROOFING

WIRE MESH

(tie all around)

Figure 15. Detail showing method of covering structural steel where

fireproofing is exposed to room

30
requiring removal. Where fireproofing is removed, it will be necessary to

restore the fire rating.

Cost - The cost will vary depending on the total square footage removed and

other factors. For example, actual costs for removal of asbestos material and

replacement with acceptable alternatives may range between $7.00 and $20.00 per

square foot.

Option 7 - Develop a specification for use by both contractor and GSA personnel

that will govern all future work around asbestos-containing material .

Discussion - When such work is necessary, environmental controls must be

exercised. The specif ication(s) should prescribe the techniques and methodologies for removing asbestos-containing material, for attachment of piping,

ducts, etc., to structural members coated with fireproofing, and for patching

of the dislodged fireproofing to retain the design fire rating. Requirements

for protective clothing, respiratory protection, work area isolation, air

monitoring, and clean-up and decontamination procedures should also be

prescribed.

General Comments

1. The installation of a fire sprinkler system or any other major building

modification requiring contact with fireproofing will have the potential

for increased physical damage to asbestos-containing material and the

release of airborne asbestos fibers. Optimally, the installation of a fire sprinkler system, duct-connection of air returns, and HEPA vacuuming

of ceiling tiles could be accomplished simultaneously where feasible. This

would achieve the lowest total cost and reduce logistical problems. The

requirements of the proposed specification in Option 7 above must be firmly

in force to keep environmental contamination to a minimum.

2. Logistical considerations associated with the potential asbestos abatement

actions are not a problem in unoccupied spaces. The potential logistics

problems in occupied spaces can be minimized by only taking such actions

in one tenant office space (or floor, or zone) at a time. Action in a particular space should be taken in a logical sequence based on physical

parameters such as layout of ventilation ductwork. Such an approach will

keep the number of persons needed to be relocated at any one time at the

lowest possible level.

3. Electron microscopy should be used for analysis of air samples taken

prior to implementation of asbestos abatement options and after completion

in order to have the most accurate assessment of effectiveness. This method

allows specific identification of asbestos fibers in all size ranges. See

section 5.0 for additional information.

31

APPENDIX A - PHOTOGRAPHIC DOCUMENTATION OF PRELIMINARY INSPECTION
Figure A. 1. Federal Building and Court House, 450 Golden Gate Avenue

San Francisco, CA.

Figure A. 2. Room 20407C - Ceiling of outside air supply plenum fan room with no apparent damage to fireproofing.

AFigure A. 3. Ceiling of equipment room of penthouse with no apparent

damage to fireproofing (note original attachment of

hangers to steel deck).

A3
Figure A. 4. Stairwell ceiling adjacent to penthouse with no apparent

damage to fireproofing

AFigure A. 5. Ceiling of window cleaning equipment room with no apparent

damage to fireproofing

Figure A. 6. Room 20408 - ceiling of electrical substation with no apparent

damage to fireproofing

A5
Figure A. 7

Figure A.

. Zone 3 elevator hoist room adjacent to roof - physical damage

to fireproofing on beam caused by roofing contractor.

8. Zone 3 elevator hoist room adjacent to roof - fireproofing

removed from beam

A6
Figure A. 9. Zone 3 elevator hoist room adjacent to roof - physical

damage to fireproofing caused by roofing contractor

A7
Figure A. 10. Zone 3 elevator hoist room adjacent to roof - physical damage

to fireproofing caused by roofing contractor .

A8
Figure A.

1

1 . Room 20408 - ceiling of electrical substation with portions

of fireproofing removed from beam flange

A9
Figure A. 12. Room 11006 - ceiling of electrical closet with physical damage

to fireproofing caused by installation of hanger

A- 10
Figure A. 13. Room 12207 - ceiling of zone 1 elevator machine room showing

patching of fireproofing damaged during installation of

hangers for ductwork

Figure A. 14. Crawl space for courthouse ventilation off plenum

stairwell #1 - patching of fireproofing following

physical damage

A-ll
Figure A. 15. Room 18204 - ceiling of zone 2 elevator control room showing

patching of fireproofing during electrical and plumbing

modifications

Figure A. 16. Room 18204 - beam in zone 2 elevator control room showing

patching of fireproofing

A- 12
Figure A. 17

Upper elevator for machine room - damaged fireproofing on structural bracing members

A- 13

Sample I.D.

1

2

3

4

5

APPENDIX B - ANALYTICAL RESULTS OF BULK SAMPLES

Analytical Results of Bulk Samples^/

Location

Fallout inside crawl space for courtroom 10%

ventilation (duct supply and plenum off 88%

Plenum Stairwell Return #1) 2%

Zone 3 Elevator Hoisting Room 8%

90%

2 %

Sweeping from upper elevator machine 5%

Room 85%

5%

Filter - Outside air supply

west side of building

chamber for 99%

Fallout above ceiling tiles in corridor 35%

between Room 8440 and 8450 63%

2%

Results

Chryostile asbestos

Glass fibers

Non-f ibrous

Chrysotile asbestos

Glass fibers

Non-f ibrous

Chrysolite asbestos

Glass fibers

Cellulosic fibers

Trace of synthetic

fibers

Glass fibers.?/

Chrysotile asbestos

Glass fibers

Non-f ibrous

1/ Bulk samples were analyzed by polarized light microscopy by a laboratory which

participates in the RTI/EPA analytical proficiency program for bulk sampling

analysis. EPA indicates that this laboratory has received a satisfactory

rating for the last three rounds of the program. However, there may be variations from laboratory to laboratory in the results reported. For additional

information see the paper "Preparation of Asbestos Standards for Methods

Verification and Laboratory Evaluation" by Lentzen, Brantly, Gold, and Myers

which appears in NBS Special Publication 619, "Asbestos Standards: Materials

and Analytical Methods," March 1982.

2/ Analytical Procedure : An acetone extraction of the fibrous sample was done,

the extract was evaporated by dryness and the residue analyzed by polarized

light microscopy.

Result : 1% asbestos or not detectable. Some optically-active fibers were

present but they were cellulosic fibers

B-l

APPENDIX C - SUMMARY OF AIR SAMPLING LOCATIONS AND RESULTS

Notes :

1. Fiber counts were determined by a laboratory accredited for asbestos

under the Laboratory Accreditation Program of the American Industrial

Hygiene Association. This accreditation was obtained by the laboratory's participation in the NIOSH Proficiency Analytical Testing

Program (PAT). However, there may be variations from laboratory to

laboratory in analyzing asbestos samples. For additional information see the paper "Membrane Filter Method: Statistical Considerations" by Chase which appears in NBS Special Publication 619,

"Asbestos Standards: Materials and Analytical Methods," March 1982.

2. Air samples were analyzed by phase contrast microscopy which has

the following limitations: (1) fibers detected may or may not be

asbestos, (2) only fibers greater than 5 ym in length and with

aspect ratios greater than 3:1 are counted, and (3) extremely thin

(<0.5 ym in width) asbestos fibers would not be detected. See

sections 4.2.1 and 4.2.2 for detailed discussion.

3. Bulk samples of fireproofing were not taken in areas where air

sampling was carried out.

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APPENDIX D - ANALYTICAL RESULTS OF AIR SAMPLES

Notes :

1. Fiber counts were determined by a laboratory accredited for asbestos

under the Laboratory Accreditation Program of the American Industrial

Hygiene Association. This accreditation was obtained by the laboratory's participation in the NIOSH Proficiency Analytical Testing

Program (PAT). However, there may be variations from laboratory to

laboratory in analyzing asbestos samples. For additional information see the paper "Membrane Filter Method: Statistical Considerations" by Chase which appears in NBS Special Publication 619,

"Asbestos Standards: Materials and Analytical Methods," March 1982.

2. Air samples were analyzed by phase contrast microscopy which has

the following limitations: (1) fibers detected may or may not be

asbestos, (2) only fibers greater than 5 pm in length and with

aspect ratios greater than 3:1 are counted, and (3) extremely thin

(<0.5 pm in width) asbestos fibers would not be detected. See

sections 4.2.1 and 4.2.2 for detailed discussion.

3. Bulk samples of fireproofing were not taken in areas where air

sampling was carried out.

D-l
ANALYSIS REPORT ©'MiOjraikss

' -».* P 0 Box 25249

I Richmond, VA 23260

Nr. Fred Stanley

A. F. Meyers & Associates

1317 Vincent Place

HcLean, VA 22101

ANALYTICS NO. GROUP NO. ACCOUNT NO. DATE

See Below

82-575

63*35

July 12, 1982 Page 1 of 2

RECEIVED JUL I 5 OBJ

SAMPLE TYPE: Cassettes for Fiber Count

DATE RECEIVED: 7-6-82

REMARKS: Field Area: 0.0056 uri^ PRIORITY HANDLING: Yes x 1

Total # of Total Sample

Sample Analytics Fields Fibers Fibers Volume

# # Counted Counted per Filter (L) F ibe

SAN 00 *3 H0085A8-1 100 2 3,05* 1,528.8 < 0.01

** H0085*9-2 100 0 < 760 1,387.1 < 0.01 *5 H008550.-3 100 2 3,05* 350.* < 0.01

*6 H008551-* 100 0 < 760 366.6 <0.01

*7 H008552-5 100 0 < 760 327.7 <0.01

*8 H008553-6 100 0 < 760 31*.

9

< 0.01

SAN 10 *9 H00855*-7 100 0 < 760 2,695.6 <0.01

50 H008555-8 100 1/2 763 2,650.8 < 0.01

51 H008556-9 100 0 < 760 681.5 < 0.01

52 H008558-0 100 0 < 760 669.0 < 0.01

53 H008559-I 100 0 < 760 *98.0 <0.01

SAN 20 5* H008560-2 100 2 3,05* 1 ,*55.3 <0.01

55 H008561-3 100 0 < 760 1 ,*33.7 < 0.01

56 H008562-* 100 1 1/2 2,290 1,279.0 <0.01

57 H008563-5 100 2 3,05* 965.* <0.01

58 HOO 856V-6 100 2 3,05* 926.* <0.01

59 H008565-7 100 1 1,527 928.0 <0.01

60 H008566-8 100 0 < 760 86*. 1 < 0.01

61 H008567-9 100 0 < 760 633.* <0.01

SAN 90 12 H008569-0 100 0

• < 760 1,650.0 <0.01

13 H008570-1 100 k 6,107 1,3*8.

3

<0.01

1* H008571-2 100 • 5 7,63* 708.5 0.01

15 H008572-3 100 0 < 760 632.1 <0.01

16 H008573-* 100 0 < 760 59*.

6

< 0.01

17 H00857A-5 100 0 < 760 597.2 <0.01

18 H008575-6 100 1 1,527 1,780.0 <0.01

19 H008576-7 100 1 1,527 1,7*7.

2

<0.01

20 H008577-8 100 36.5 55,728 2,195.2 0.03

21 H008578-9 100 0 < 760 655.* <0.01

t 0.01

1 0.01

D-2
ANALYSIS REPORT ®lAlS)D£7SD(S§ ^ -k'.P.O. Box 25249

I Richmond, VA 23260

Hr. Fred Stanley

A. F. Heyers & Associates

1317 Vincent Place

McLean, VA 22101

ANALYTICS NO. GROUP NO. ACCOUNT NO. DATE

See Below

82-575

63*35

July 12, 1982 Page 2 of 2

SAMPLE TYPE: Cassettes for fiber count

DATE RECEIVED: 7-6-82

REMARKS: Field Area: 0.0056 mn^ PRIORITY HANDLING: . Yes x No

Total # of Total Sample

Sample Analytics Fields Fibers Fibers Volume

# # Counted Counted per Filter (L) Fibers/cc

SAN 90 22 H008580-0 too 3.5 5,3** 659.3 <0.01

23 H00858 1-1 too * 6,107 362.9 0.02 ± 0.02

2* H008582-2 100 9.5 1* , 50* 35*.

7

0.0* ± 0.0*

25 H008583-3 too 6 9,161 390.2 0.02 ± 0.02

26 H00858*-* too 2 3,05* 1,955.2 <0.01

27 H008585-5 too 0 < 760 563.6 <0.01

28 H008586-6 too 0 < 760 393.5 <0.01

SAN Blank H008587-7 too 0 O

vO V NA

D-3
RECEIVED JUl 0 8 BuZanalysis report

C it’. P.O. Box 25249

I Richmond, VA 23260

Mr. Fred Stanley

A. F. Meyer & Associates

1317 Vincent Place

McLean, VA 22101

ANALYTICS NO. GROUP NO. ACCOUNT NO. DATE

See Below

82-566

63*35

July 7, 1982

SAMPLE TYPES Cassettes for Fiber Count

DATE RECEIVED: 7-2-82

REMARKS: Field Area1 : 0.0056 mm^ PRIORITY HANDLING: Yes x No

Ref: San Account

Total # of Total Samp 1

e

Sample Analytics Fields Fibers Fibers Volume

# # Counted Counted per Filter (L) Fibers/cc

SAN 8001 8*150 100 3 *,580. 719.6 < 0.01

SAN 8002 8*161 100 3.5 5,3**. 752.3 < 0.01

SAN 8003 8*172 100 * 6,107. 905.9 < 0.01

SAN 800* 8*183 100 * 6,107. 85*.

2

< 0.01

SAN 8005 8*19* 100 1 1,527. 1 ,112.5 < 0.01

SAN 8006 8*205 100 3 *,580. 889.7 < 0.01

SAN 8007 8*216 100 2 3,05*. 869.9 < 0.01

SAN 8008 8*227 100 * 6,107. 82*.

6

< 0.01

SAN 8009 8*238 100 *.5 6,871. 682.1 0.01 * 0.01

SAN 8010 8*2*9 100 2.5 3,817. 686.8 < 0.01

SAN 8011 - 8*260 100 2 3,05* 2 ,211.6 < 0.01

/fJames A. Calpin, CIH

D-4
ANALYSIS REPORT

luucsju^y ANALYTICS NO. See Below

P.0 Box 25249

1 Richmond, VA 23260

CROUP NO. 82-576

• ACCOUNT NO. 63*35

DATE July 12, 1982 Nr. Fred Stanley

A. F. Meyer 4 Associates

1317 Vincent Place

Hclean, VA 22101 Krcrr.Tojui 1

SAMPLE TYPE: Cassettes for Fiber Count

OATE RECEIVED: 7-6-82

REMARKS: Field Area: 0.0056 mm* PRIORITY HANDLING: Yes x No

Ref: SAN

Samp 1

e

#

Analytics

#

Total

Fields

Counted

# of Fibers

Counted

Total

Fibers

per Filter

Samp 1

e

Volume

(L) Fibers/cc

37 H008597-6 100 2 3,05* 1,076 < 0.01

38 H008598-7 100 1 1,527 1,083 < 0.01

39 H008599-8 too 2 3,05* 979.* < 0.01

AO H008600-9 100 3 *,580 1,237.3 < 0.01

D-5

APPENDIX E - DETAILS SHOWING METHOD OF DUCTING AIR RETURN SYSTEM AND

INSTALLATION OF HIGH EFFICIENCY FILTERS

E-l
E-2

Figure

E.l.

Detail

of

connection

of

return

air

diffuser

to

existing

return

air

duct
Note: See Figure E.l for detail of ducting connections.

Figure E.2. Method of ducting air returns in elevator lobby areas

E-3
bCC

3

14-1

Ed

0)U

3

be

•H

En

E-4

Note:

See

Figure

E.l

for

ducting

connection

details
I E-5

I

Figure

E.4.

Method

for

ducting

air

returns

in

corner

section

of

building
'od

E-6

Figure

E.5.

Placement

of

new

high

efficiency

air

filters

in

HVAC

system
NBS-114A (REV. 2 -80 ) U.S. DEPT. OF COMM. 1. PUBLICATION OR 2. Performing Organ. Report No. 3. Publication Date BIBLIOGRAPHIC DATA

REPORT NO.

SHEET (See instructions) NBSIR 83-2650 February 1983

4. TITLE AND SUBTITLE

Asbestos Survey of the Federal Building and Court House

at 450 Golden Gate Avenue, San Francisco, California

5. AUTHOR(S)

James H. Pielert

6, PERFORMING ORGANIZATION (If joint or other than N BS, see instructions)

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

7. Contract/Grant No.

8. Type of Report & Period Covered

9. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street. City. State. ZIP)

Public Buildings Service

Office of Design and Construction

General Services Administration

Washington, DC 20405

10. SUPPLEMENTARY NOTES

[~ ~| Document describes a computer program; SF-185, FIPS Software Summary, is attached.

11. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bi bliography or literature survey, mention it here) The report describes a study conducted by the National Bureau of Standards for

the Public Buildings Service of the General Services Administration on the use

of fireproofing suspected of containing asbestos in a Federal building. The

report presents the results of physical inspections of selected portions of the

building, application of bulk and air sampling techniques, and includes asbestos

abatement options that GSA may wish to consider for reducing airborne asbestos

fiber levels in the building.

12. KEY WORDS (Six to twelve entries; alphabetical order; capitalize only proper names; and separate key words by semicolon s)

asbestos; buildings; fireproofing; structures

13. AVAILABILITY

| | Unlimited

[~X| For Official Distribution. Do Not Release to NTIS r—] Order From Superintendent of Documents, U.S. Government Printing Office, Washington, D.C.

20402.

[^] Order From National Technical Information Service (NTIS), Springfield, VA. 22161

14. NO. OF

PRINTED PAGES

64

15. Price

USCOMM-DC 6043-P80

I

I
\/ .