CHAPTER 3

AN ANNOTATED COPY OF 24 CFR PART 51

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DEPARTMENT OF HOUSING AND

URBAN DEVELOPMENT

Office of the Secretary

[24 CFR Part 51](http://www.gpoaccess.gov/cfr/index.html)

Environmental Criteria and Standards

Subpart A - General Provisions

EFFECTIVE DATE: August 13, 1979

SOURCE: Federal Register: July 12,

1979; pp 40860-40862

51.1 Purpose

51.2 Authority

51.3 Responsibilities

51.4 Program coverage

51.5 Coordination with environmental

clearance requirements

51.6 Reserved

Authority: Section 7(d). Department

of Housing and Urban Development Act

(42 U.S.C. 3535 (d)).

51.1 PURPOSE

The Department of Housing and

Urban Development is providing program

Assistant Secretaries and

administrators and field offices with

environmental standards, criteria and

guidelines for determining project

acceptability and necessary mitigating

measures to insure that activities

assisted by the Department achieve the

goal of a suitable living environment.

51.2 AUTHORITY

This Part implements the

Department\'s responsibilities under the

following statutes:

\(a\) The National Housing Act of

1934 (P.L. 73-479 ) which was

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enacted \"to encourage

improvements in housing

standards and conditions, to

provide a system of mutual

mortgage insurance, and for

other purposes,\" thus

providing the basis for HUD\'s

Minimum Property Standards

(MPS) which have evolved as

required by legislation over

the past 44 years.

\(b\) The Housing Act of 1949 (P.L.

81-171) which sets forth the

national goal of \"a decent

home and a suitable living

environment for every

American family,\" affirmed by

the Housing and Urban

Development Act of 1968 (P.L.

90-448).

\(c\) The Department of Housing and

Urban Development Act of 1965

(P.L. 89-174) which provides

that the Secretary may make

such rules and regulations as

may be necessary to carry out

functions, powers, and

duties, and sets forth, as a

matter of national purpose,

the sound development of the

Nation\'s communities and

metropolitan areas.

\(d\) The National Environmental

Policy Act of 1969 (P.L.

91-190) which directs Federal

agencies to develop

procedures to carry out the

purposes of the Act.

\(e\) Intergovernmental Cooperation

Act of 1968 (P.L. 90-577)

which, under Title IV,

directs that Federal programs

and projects serve the

objectives of appropriate

land use for housing,

commercial, industrial,

governmental, institutional,

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and other purposes to achieve

sound and orderly development

of all areas, both urban and

rural.

51.3 RESPONSIBILITIES

\(a\) Assistant Secretary for

Community Planning and

Development. The Assistant

Secretary for Community

Planning and Development

shall be responsible for

administering environmental

regulations, and shall

provide oversight,

interpretation and guidance, and

shall update the regulations

as required. The Assistant

Secretary shall also maintain

liaison with other Federal

agencies on matters of

environmental policy

implementation.

\(b\) Assistant Secretary for

Policy Development and

Research. The Assistant

Secretary for Policy

Development and Research shall

undertake research and

demonstration studies

necessary for the technical

development of environmental

standards, criteria, and

implementing techniques as a

basis for the development and

implementation of

environmental regulations. The

Assistant Secretary shall

also maintain liaison with

Federal agencies on related

technical matters.

\(c\) Other Assistant Secretaries,

Administrators, and the

General Counsel. Other

Assistant Secretaries,

Administrators, and the

General Counsel shall:

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\(1\) Incorporate adopted

environmental regulations

by reference into

program regulations,

guidance documents, and

administrative forms and

procedures;

\(2\) Evaluate the effects of,

and compliance with

Departmental

environmental regulations

policy and report

significant issues and

problems to the

Assistant Secretary for

Community Planning and

Development; and

\(3\) Identify program areas

under their jurisdiction

in which additional

environmental regulations

are needed, and

refer them to the

Assistant Secretary for

Community Planning and

Development.

\(d\) Regional Administrators, Area \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Office Managers, Service \* \*

Office Supervisors. Regional \* GRAPHICS \*

Administrators, Area Office \* MATERIAL \*

Managers, and Service Office \* IN \*

Supervisors shall assure that \* ORIGINAL \*

adopted environmental \* DOCUMENT \*

regulations are implemented in \* OMITTED \*

relation to program decisions \* \*

and recommendations. They \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

shall also monitor projects

to assure that mitigation

measures are implemented.

51.4 PROGRAM COVERAGE

Environmental standards shall

apply to all HUD actions except where

special provisions and exemptions are

contained in each Subpart.

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51.5 COORDINATION WITH ENVIRONMENTAL

CLEARANCE REQUIREMENTS

Environmental standards shall be

implemented prior to commitment in the

decision-making process and, where

environmental clearances are required,

the decision points shall be

identical. Compliance with HUD

environmental standards shall be

addressed in the environmental

clearance process.

51.6 (RESERVED)

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Subpart B - Noise Abatement

and Control

EFFECTIVE DATE: August 13, 1979

SOURCE: Federal Register: July 12,

1979; pp 40862-40866

51.100 Purpose and Authority

51.101 General policy

51.102 Responsibilities

51.103 Criteria and standards

51.104 Special requirements

51.105 Exceptions

51.106 Implementation

Appendix I to Subpart B

51.100 PURPOSE AND AUTHORITY

\(a\) Purpose. The Department of \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Housing and Urban Development \* \*

finds that noise is a major \* GRAPHICS \*

source of environmental \* MATERIAL \*

pollution which represents a \* IN \*

threat to the serenity and \* ORIGINAL \*

quality of life in population \* DOCUMENT \*

centers and that noise \* OMITTED \*

exposure may be a cause of \* \*

adverse physiological and \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

psychological effects as well

as economic losses.

It is the purpose of this

Subpart to:

\(1\) Call attention to the

threat of noise

pollution;

\(2\) Encourage the control of

noise at its source in

cooperation with other

Federal departments and

agencies;

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\(3\) Encourage land use

patterns for housing and

other noise sensitive

urban needs that will

provide a suitable

separation between them

and major noise sources;

\(4\) Generally prohibit HUD

support for new

construction of noise

sensitive uses on sites

having unacceptable

noise exposure;

\(5\) Provide policy an the

use of structural and

other noise attenuation

measures where needed;

and

\(6\) Provide policy to guide

implementation of

various HUD programs.

\(b\) Authority. Specific

authorities for noise

abatement and control are

contained in:

\(1\) The Noise Control Act of

1972 (P.L. 92-574) which

directs Federal agencies

to administer their

programs in ways which

reduce noise pollution.

\(2\) The Quiet Communities

Act of 1978 (P.L.

95-609) which amended

P.L. 92-574.

\(3\) The General Services

Administration, Federal

Management Circular

75-2: Compatible Land

Uses at Federal

Airfields prescribes the

Executive Branch\'s

general policy with

respect to achieving

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compatible land uses on

either public or

privately owned property

at or in the vicinity of

Federal airfields.

\(4\) Section 1113 of the

Housing and Urban

Development Act of 1965

(P.L. 89-117) directs

the Secretary \"\* \* \* to

determine feasible

methods of reducing the

economic loss and

hardships suffered by

homeowners as a result

of the depreciation in

the value of their

properties following the

construction of airports

in the vicinity of

their homes, including a

study of feasible

methods of insulating

such homes from the

noise of aircraft.\"

51.101 GENERAL POLICY

\(a\) It is HUD\'s general policy to

provide minimum national

standards applicable to HUD

programs to protect citizens

against excessive noise in

their communities and places

of residence.

\(1\) Comprehensive planning

assistance. HUD

requires that grantees

give adequate consideration

to noise exposures

and sources of noise

exposures and sources of

noise as an integral

part of the urban

environment in HUD

assisted comprehensive

planning, as follows:

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\(i\) Particular

emphasis shall be

placed on the

importance of

compatible land

use planning in

relation to

airports, highways

and other sources

of high noise.

\(ii\) Applicants shall

take into

consideration HUD

environmental

standards impacting

the use of

land as required

in 24 CFR Part

600\.

\(iii\) Environmental

studies,

including noise

assessments, are

allowable costs.

\(2\) Community Development

Block Grants.

Recipients of community

development block grants

under the Housing and

Community Development

Act of 1974 (P.L.

93-383), as amended by

the Housing and

Community Development Act

of 1977 (P.L. 95-128),

must take into

consideration the noise

criteria and standards

in the environmental

review process and

consider ameliorative

actions when noise

sensitive land

development is proposed in

noise exposed areas.

Grant recipients shall

address deviations from

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the standards in their

environmental reviews as

required in 24 CFR Part

58\.

Where CDBG activities

are planned in a noisy

area, and HUD assistance

is contemplated later

for housing and/or other

noise sensitive

activities, the CDBG

grantee risks denial of

the HUD assistance

unless the HUD standards

are met. Environmental

studies, including noise

assessments, are

allowable costs.

\(3\) HUD support for new

construction. HUD

assistance for the

construction of new noise

sensitive uses is

prohibited generally for

projects with Unacceptable

noise exposures and

is discouraged for

projects with Normally

Unacceptable noise

exposure. (Standards of

acceptability are

contained in section

51.103(c).) This policy

applies to all HUD

programs providing

assistance, subsidy or

insurance for housing,

college housing, mobile

home parks, nursing

homes, hospitals, and

all programs providing

assistance or insurance

for land development,

new communities,

redevelopment or any

other provision of

facilities and services

which are directed to

making land available

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for housing or noise

sensitive development.

The policy does

not apply to research

demonstration projects

which do not result in

new construction or

reconstruction, flood

insurance, interstate

land sales registration,

or any action or

emergency assistance

under disaster

assistance programs

which are provided to

save lives, protect

property, protect public

health and safety,

remove debris and

wreckage, or assistance

provided that has the

effect of restoring

facilities substantially

as they existed prior to

the disaster.

\(4\) HUD support for existing \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

construction. Noise \* \*

exposure by itself will \* GRAPHICS \*

not result in the denial \* MATERIAL \*

of HUD support for the \* IN \*

resale and purchase of \* ORIGINAL \*

otherwise acceptable \* DOCUMENT \*

existing buildings. \* OMITTED \*

However, environmental \* \*

noise is a marketability \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

factor which HUD will

consider in determining

the amount of insurance

or other assistance that

may be given.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(5\) HUD support of \* \*

modernization and \* GRAPHICS \*

rehabilitation. For \* MATERIAL \*

modernization projects \* IN \*

located in all noise \* ORIGINAL \*

exposed areas, HUD shall \* DOCUMENT \*

encourage noise \* OMITTED \*

attenuation features in \* \*

alterations. For major \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

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or substantial rehabilitation

projects in the

Normally Unacceptable

and Unacceptable noise

zones, HUD actively

shall seek to have

project sponsors

incorporate noise

attenuation features,

given the extent and

nature of the rehabilitation

being undertaken

and the level of

exterior noise

exposure. In

Unacceptable noise

zones, HUD shall

strongly encourage

conversion of noise

exposed sites to land

uses compatible with the

high noise levels.

\(6\) Research, guidance and

publications. HUD shall

maintain a continuing

program designed to

provide new knowledge of

noise abatement and

control to public and

private bodies, to

develop improved methods

for anticipating noise

encroachment, to develop

noise abatement measures

through land use and

building construction

practices, and to foster

better understanding of

the consequences of

noise. It shall be

HUD\'s policy to issue

guidance documents

periodically to assist

HUD personnel in

assigning an

acceptability category to

projects in accordance

with noise exposure

standards, in evaluating

noise attenuation

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measures, and in

advising local agencies

about noise abatement

strategies. The guidance

documents shall be

updated periodically in

accordance with advances

in the state-of-the-art.

\(7\) Construction equipment

building equipment and

appliances. HUD shall

encourage the use of

quieter construction

equipment and methods in

population centers, the

use of quieter equipment

and appliances in

buildings, and the use

of appropriate noise

abatement techniques in

the design of

residential structures

with potential noise

problems.

\(8\) Exterior noise goals.

It is a HUD goal that

exterior noise levels do

not exceed a day-night

average sound level of

55 decibels. This level

is recommended by the \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Environmental Protection \* \*

Agency as a goal for \* GRAPHICS \*

outdoors in residential \* MATERIAL \*

areas. The levels \* IN \*

recommended by EPA are \* ORIGINAL \*

Mt standards and do not \* DOCUMENT \*

take into account cost \* OMITTED \*

or feasibility. For the \* \*

purposes of this regulation \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

and to meet other

program objectives

sites with a day-night

average sound level of

65 and below are

acceptable and are

allowable (see Standards

in section 51.103(c)).

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\(9\) Interior noise goals.

It is a HUD goal that

the interior auditory

environment shall not

exceed a day-night

average sound level of

45 decibels. Attenuation

measures to meet

these interior goals

shall be employed where

feasible. Emphasis

shall be given to noise

sensitive interior

spaces such as bedrooms.

Minimum attenuation

requirements are

prescribed in section

51.104(a).

\(10\) Acoustical privacy in

multifamily buildings.

HUD shall require the

use of building design

and acoustical treatment

to afford acoustical

privacy in multifamily

buildings pursuant to

requirements of the

minimum Property

Standards.

51.102 RESPONSIBILITIES

\(a\) Authority to approve projects.

\(1\) Decisions on proposed

projects with acceptable

noise exposures shall be

delegated to the program

personnel within field

offices, including

projects where increased

noise levels are

considered acceptable

because of non-acoustic

benefits under section

51.105(a). Field office

program personnel may

also approve projects in

normally unacceptable

noise exposed areas

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where adequate sound

attenuation is provided

and where the project

does not require an

Environmental Impact

Statement under section

51.104(b).

\(2\) Other approvals in

normally unacceptable

noise exposed areas

require the concurrence

of the Regional

Administrator.

\(3\) Requests for approvals

of projects or portions

of projects with

unacceptable noise

exposures shall be

referred through the

Regional Office to the

Assistant Secretary for

Community Planning and

Development for approval

pursuant to section

51.104(b).

\(4\) In cases where the

Regional Administrator

determines that an

important precedent or

issue is involved, such

cases shall be referred

with recommendations to

the Assistant Secretary

for Community Planning

and Development.

\(b\) Surveillance of noise problem

areas. Appropriate field

staff shall maintain

surveillance of potential

noise problem areas and

advise local officials,

developers, and planning

groups of the unacceptability

of sites because of

noise exposure at the

earliest possible time in the

decision process. Every

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attempt shall be made to

insure that applicants\' site

choices are consistent with

the policy and standards

contained herein.

\(c\) Notice to applicants. At the

earliest possible stage, HUD

program administrators shall:

\(1\) Determine the

suitability of the

acoustical environment

of proposed projects;

\(2\) Notify applicants of any

adverse or questionable

situations; and

\(3\) Assure that prospective

applicants are apprised

of the standards

contained herein so that

future site choices will

be consistent with these

standards.

\(d\) Technical assistance.

Technical assistance in the

measurement, estimation,

interpretation, or prediction

of noise exposure is

available from the Office of

Community Planning and

Development and the Office of

Policy Development and

Research. Field office

questions shall be forwarded

through the Regional Office

to the Assistant Secretary

for Community Planning and

Development or his designee.

\(e\) Interdepartmental

coordination. Regional

Administrators shall foster

appropriate coordination

between field offices and

other departments and

agencies, particularly the

Environmental Protection

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Agency, the Department of

Transportation, Department of

Defense representatives, and

the Veterans Administration.

HUD staff shall utilize the

acceptability standards in

commenting on the prospective

impacts of transportation

facilities and other

noise generators in the

Environmental Impact

Statement review process.

51.103 CRITERIA AND STANDARDS

These standards apply to all

programs as indicated in section

51.101.

\(a\) Measure of external noise

environments. The magnitude

of the external noise

environment at a site is

determined by the value of

the day-night average sound

level produced as the result

of the accumulation of noise

from all sources contributing

to the external noise

environment at the site.

Day-night average sound

level, abbreviated as DNL and

symbolized as Ldn, is the

24-hour average sound level,

in decibels, obtained after

addition of 10 decibels to

sound levels in the night

from 10 p.m. to 7 a.m.

Mathematical expressions for

average sound level and

day-night average sound level

are stated in the Appendix I

to this Subpart.

\(b\) Loud impulsive sounds. On an

interim basis, when loud

impulsive sounds, such as

explosions or sonic booms,

are experienced at a site,

the day-night average sound

level produced by the loud

impulsive sounds alone shall

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have 8 decibels added to it

in assessing the acceptability

of the site (see

Appendix). Alternatively,

the C-weighted day-night

average sound level (Lcdn)

may be used without the 8

decibel addition, as

indicated in section

51.106(a)(3).

Methods for assessing the

contribution of loud impulsive

sounds to day-night

average sound level at a site

and mathematical expressions

for determining whether

a sound is classed as \"loud

impulsive\" are provided in

the Appendix.

\(c\) Exterior standards. The

degree of acceptability of

the noise environment at a

site is determined by the

sound levels external to

buildings or other facilities

containing noise sensitive \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

uses. The standards shall \* \*

usually apply at a location 2 \* GRAPHICS \*

meters (6.5 feet) from the \* MATERIAL \*

building housing noise \* IN \*

sensitive activities in the \* ORIGINAL \*

direction of the predominant \* DOCUMENT \*

noise source. Where the \* OMITTED \*

building location is \* \*

undetermined, the standards \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

shall apply 2 meters (6.5

feet) from the building

setback line nearest to the

predominant noise source.

The standards shall also

apply at other locations

where it is determined that

quiet outdoor space is

required in an area ancillary

to the principal use on the

site.

The noise environment inside

a building is considered

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acceptable if (a) the noise

environment external to the

building complies with these

standards, and (b) the

building is constructed in a

manner common to the area or,

if of uncommon construction,

has at least the equivalent

noise attenuation

characteristics.

Site Acceptability Standards

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Day-Night average sound Special approvals

level (in decibels) and requirements

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Acceptable\...\.... Not exceeding 65 dB(1)\...\...\... None

Normally\...\...\....Above 65 dB but not Special Approvals (2)

Unacceptable exceeding 75 dB Environmental Review (3)

Attenuation (4)

Unacceptable\...\...Above 75 dB\...\...\...\...\...\..... Special
Approvals (2)

Environmental Review (3)

Attenuation (5)

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Notes:

\(1\) Acceptable threshold may be

shifted to 70 dB in special

circumstances pursuant to section

51.105(a).

\(2\) See section 51.104(b) for

requirements.

\(3\) See section 51.104(b) for

requirements.

\(4\) 5 dB additional attenuation

required for sites above 65 dB but

not exceeding 70 dB and 10 dB

additional attenuation required

for sites above 70 dB but not

exceeding 75 dB. (See section

51.104(a).)

\(5\) Attenuation measures to be

submitted to the Assistant

Secretary for CPD for approval on

a case-by-case basis.

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51.104 SPECIAL REQUIREMENTS \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* \*

\(a\) Noise attenuation. Noise \* GRAPHICS MATERIAL\*

attenuation measures are \* IN ORIGINAL \*

those required in addition \* DOCUMENT OMITTED \*

to attenuation provided by \* \*

buildings as commonly \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

constructed in the area, and

requiring open windows for

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* ventilation. Measures that

\* GRAPHICS \* reduce external noise at a

\* MATERIAL \* site shall be used wherever

\* IN \* practicable in preference to

\* ORIGINAL \* the incorporation of additional

\* DOCUMENT \* noise attenuation in

\* OMITTED \* buildings. Building designs

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* and construction techniques

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* that provide more noise

\* GRAPHICS \* attenuation than typical

\* MATERIAL \* construction may be employed

\* IN \* also to meet the noise

\* ORIGINAL \* attenuation requirements.

\* DOCUMENT \*

\* OMITTED \* (1) Normally Unacceptable

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* noise zone. Approvals

in this zone require a

minimum of 5 decibels \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

additional sound \* GRAPHICS \*

attenuation for buildings \* MATERIAL \*

having noise-sensitive \* IN \*

uses if the day-night \* ORIGINAL \*

average sound level is \* DOCUMENT \*

greater than 65 decibels \* OMITTED \*

but does not exceed 70 \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

decibels, or a minimum

of 10 decibels of additional

sound attenuation

if the day-night average

sound level is greater

than 70 decibels but

does not exceed 75

decibels.

\(2\) Unacceptable noise

zone. Noise attenuation

measures require the

approval of the

Assistant Secretary for

Community Planning and

Development. (See

section 51.104(b)(2).)

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\(b\) Special Approvals and

Environmental Review

Requirements. Environmental

clearances shall be

conducted pursuant to the

requirements of HUD\'s

Departmental Policies,

Responsibilities and

Procedures for Protection and

Enhancement of Environmental

Quality (38 FR 19182 as

amended) or other environmental

regulations which may

be issued by the Department. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

The Special Clearance and \* \*

Environmental Impact \* GRAPHICS MATERIAL\*

Statement (EIS) threshold \* IN ORIGINAL \*

requirements are hereby \* DOCUMENT OMITTED \*

modified for all projects \* \*

proposed in the Normally \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Unacceptable and Unacceptable

noise exposure zones as

follows:

\(1\) Normally Unacceptable

noise zone.

\(i\) All projects

located in the

Normally

Unacceptable

Noise Zone

require a Special

Environmental

Clearance except

an EIS is

required for a

proposed project

located in a

largely undeveloped

area, or

where the HUD

action is likely

to encourage the

establishment of

incompatible land

use in this noise

zone.

\(ii\) When an EIS is

required, the

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concurrence of

the Regional

Administrator is

also required

before a project

can be approved.

For the purposes

of this paragraph,

an area

will be considered as

largely undeveloped \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

unless the \* \*

area within a \* GRAPHICS \*

2-mile radius of \* MATERIAL \*

the project \* IN \*

boundary is more \* ORIGINAL \*

than 50 percent \* DOCUMENT \*

developed for \* OMITTED \*

urban uses and \* \*

infrastructure \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

(particularly

water and sewers)

is available and

has capacity to

serve the project.

\(iii\) All other

projects in the

Normally

Unacceptable zone

require a Special

Environmental

Clearance, except

where an EIS is

required for

other reasons

pursuant to HUD

environmental

policies.

\(2\) Unacceptable noise

zone. An EIS is

required prior to the

approval of projects

with unacceptable noise

exposure. Projects in

or partially in an

Unacceptable Noise Zone

shall be submitted

through the Regional

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Administrator to the

Assistant Secretary for

Community Planning and

Development for

approval. The Assistant

Secretary may waive the

EIS requirement in cases

where noise is the only

environmental issue and

no outdoor sensitive

activity will take place

on the site. In such

cases, a Special

Environmental Clearance

is required.

51.105 EXCEPTIONS

\(a\) Flexibility for non-acoustic

benefits. Where it is \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

determined that program \* \*

objectives cannot be achieved \* GRAPHICS \*

on sites meeting the \* MATERIAL \*

acceptability standard of 65 \* IN \*

decibels, the Acceptable Zone \* ORIGINAL \*

may be shifted to Ldn 70 on \* DOCUMENT \*

a case-by-case basis if all \* OMITTED \*

the following conditions are \* \*

satisfied: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(1\) The project does not

require an Environmental

Impact Statement under

provisions of section

104(b)(1) and noise is

the only environmental

issue.

\(2\) The project has received

a Special Environmental

Clearance and has

received the concurrence

of the Environmental

Clearance Officer.

\(3\) The project meets other

program goals to provide

housing in proximity to

employment, public

facilities and

transportation.

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\(4\) The project is in

conformance with local

goals and maintains the

character of the

neighborhood.

\(5\) The project sponsor has

set forth reasons

acceptable to HUD: as to

why the noise attenuation

measures that would

normally be required for

new construction in the

Ldn 65 to Ldn 70

zone cannot be met.

\(6\) Other sites which are

not exposed to noise

above Ldn 65 and which

meet program objectives

are generally not

available.

The above factors shall be

documented and made part of

the project file.

51.106 IMPLEMENTATION

\(a\) Use of available data. HUD

field staff shall make

maximum use of noise data

prepared by others when such

data are determined to be

current and adequately

projected into the future and

are in terms of the following:

\(1\) Sites in the vicinity of

airports. The noise

environment around

airports is described

sometimes in terms of

Noise Exposure Forecasts,

abbreviated as

NEF or, in the State of

California, as Community

Noise Equivalent Level,

abbreviated as CNEL.

The noise environment

for sites in the

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vicinity of airports for \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

which day-night average \* GRAPHICS \*

sound level data are not \* MATERIAL \*

available may be \* IN \*

evaluated from NEF or \* ORIGINAL \*

CNEL analyses using the \* DOCUMENT \*

following conversions to \* OMITTED \*

DNL: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

DNL = NEF+35

DNL = CNEL

\(2\) Sites in the vicinity of

highways. Highway

projects receiving

Federal aid are subject

to noise analyses under

the procedures of the

Federal Highway

Administration.

Where such analyses are

available they may be

used to assess sites

subject to the

requirements of this

standard. The Federal

Highway Administration

employs two alternate

sound level descriptors:

\(a\) The A-weighted sound level

not exceeded more than

10 percent of the time

for the highway design

hour traffic flow,

symbolized as L10; or

\(b\) the equivalent sound

level for the design

hour, symbolized as

Leq. The day-night

average sound level may

be estimated from the

design hour L10 or \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Leq values by the \* GRAPHICS \*

following relationships, \* MATERIAL \*

provided heavy trucks do \* IN \*

not exceed 10 percent of \* ORIGINAL \*

the total traffic flow \* DOCUMENT \*

in vehicles per 24 hours \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

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and the traffic flow

between 10 p.m. and 7

a.m. does not exceed 15

percent of the average

daily traffic flow in

vehicles per 24 hours:

DNL = L10 (design

hour) minus 3 decibels

DNL = Leq (design

hour) decibels

Where the auto/truck mix

and time of day

relationships as stated in

this Section do not

exist, the HUD Noise

Assessment Guidelines or

other noise analysis

shall be used.

\(3\) Sites in the vicinity of

installations producing

loud impulsive sounds.

Certain Department of

Defense installations

produce loud impulsive

sounds from artillery

firing and bombing

practice ranges. Noise

analyses for these

facilities sometimes

encompass sites that may

be subject to the

requirements of this

standard. Where such

analyses are available

they may be used on an

interim basis to

establish the

acceptability of sites under

this standard.

The Department of

Defense uses day-night

average sound level

based on C-weighted

sound level, symbolized

Lcdn, for the analysis

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of loud impulsive

sounds. Where such

analyses are provided,

the 8 decibel addition

specified in section

51.103(b), is not

required, and the same

numerical values of

day-night average sound

level used an an interim

basis to determine site

suitability for

nonimpulsive sounds apply

to the Lcdn.

\(4\) Use of areawide

acoustical data. HUD

encourages the

preparation and use of areawide

acoustical information,

such as noise contours \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

for airports. Where \* GRAPHICS \*

such new or revised \* MATERIAL \*

contours become \* IN \*

available for airports \* ORIGINAL \*

(civil or military) and \* DOCUMENT \*

military installations \* OMITTED \*

they shall first be \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

referred to the Regional

Office (Environmental

Clearance Officer) for

review, evaluation and

decision on appropriateness

for use by HUD.

The Regional Office

shall submit revised

contours to the

Assistant Secretary of

Community Planning and

Development for review,

evaluation and decision

whenever the area \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

affected is changed by \* GRAPHICS \*

20 percent or more, or \* MATERIAL \*

whenever it is \* IN \*

determined that the new \* ORIGINAL \*

contours will have a \* DOCUMENT \*

significant effect an \* OMITTED \*

HUD programs, or \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

whenever the contours

are not provided in a

methodology acceptable

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under section

51.106(a)(1) or in other

cases where the Regional

Office determines that

Headquarters review is

warranted. For other

areawide acoustical

data, review is required

only where existing

areawide data have been

changed to reflect

changes in the measurement

methodology or

underlying noise source

assumptions. Requests

for determination on

usage of new or revised

areawide data shall

include the following:

\(i\) Maps showing old,

if applicable,

and new noise

contours, along

with brief

description of

data source and

methodology.

\(ii\) Impact on

existing and

prospective

urbanized areas

and on

development

activity.

\(iii\) Impact on

HUD-assisted

projects

currently in

processing.

\(iv\) Impact on future

HUD program

activity. Where

a field office

has determined

that immediate

approval of new

areawide data is

3-29

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necessary and

warranted in

limited geographic areas,

the request for

approval should

state the

circumstances

warranting such

approval.

Actions on

proposed projects

shall not be

undertaken while

new areawide

noise data are

being considered

for HUD use

except where the

proposed location

is affected in

the same manner

under both the

old and new noise

data.

\(b\) Site assessments. Compliance

with the standards contained

in section 51.103(c) shall,

where necessary, be determined

using noise assessment

guidelines, handbooks,

technical documents and

procedures issued by the

Department.

\(c\) Variations in site noise

levels. In many instances

the noise environment will

vary across a site, with

portions of the site being in

an Acceptable noise environment

and other portions in a

Normally Unacceptable noise

environment. The standards

in section 51.103(c) shall

apply to the portions of a

building or buildings used

for residential purposes and

for ancillary noise sensitive

open spaces.

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\(d\) Noise measurements. Where

noise assessments result in a

finding that the site is

borderline or questionable,

or is controversial, noise

measurements may be

performed. Where it is \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

determined that noise \* GRAPHICS \*

measurements are required, \* MATERIAL \*

such measurements will be \* IN \*

conducted in accordance with \* ORIGINAL \*

methods and measurement \* DOCUMENT \*

criteria established by \* OMITTED \*

Department. Locations for \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

noise measurements will

depend on the location of

noise sensitive uses that are

nearest to the predominant

noise source (see section

51.103(c)).

\(e\) Projections of noise

exposure. In addition to

assessing existing exposure,

future conditions should be

projected. To the extent \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

possible, noise exposure \* GRAPHICS \*

shall be projected to be \* MATERIAL \*

representative of conditions \* IN \*

that are expected to exist at \* ORIGINAL \*

a time at least 10 years \* DOCUMENT \*

beyond the date of the \* OMITTED \*

project or action under \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

review.

\(f\) Reduction of site noise by

use of berms and/or

barriers. If it is

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* determined by adequate

\* GRAPHICS \* analysis that a berm and/or

\* MATERIAL \* barrier will reduce noise at

\* IN \* a housing site, and if the

\* ORIGINAL \* barrier is existing or there

\* DOCUMENT \* are assurances that it will

\* OMITTED \* be in place prior to

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* occupancy, the environmental

noise analysis for the site

may reflect the benefits

afforded by the berm and/or

barrier.

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In the environmental review

process under section \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

51.104(b), the location, \* GRAPHICS \*

height and design of the berm \* MATERIAL \*

and/or barrier shall be \* IN \*

evaluated to determine its \* ORIGINAL \*

effectiveness, and impact on \* DOCUMENT \*

design and aesthetic quality, \* OMITTED \*

circulation and other \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

environmental factors.

APPENDIX I TO SUBPART B\--definition of

acoustical quantities

1\. Sound level. The quantity in

decibels measured with an instrument

satisfying requirements of

American National Standard

Specification for Type 1 Sound

Level Meters S1.4-1971. Fast

time-averaging and A-frequency

weighting are to be used, unless

others are specified. The sound

level meter with the A-weighting

is progressively less sensitive to

sounds of frequency below 1,000

hertz (cycles per second), somewhat

as is the ear. With fast

time averaging the sound level

meter responds particularly to

recent sounds almost as quickly as

does the ear in judging the

loudness of a sound.

2\. Average Sound Level. Average

sound level, in decibels, is the

level of the mean-square

A-weighted sound pressure during

the stated time period, with

reference to the square of the

standard reference sound pressure

of 20 micropascals.

Day-night average sound level,

abbreviated as DNL, and symbolized

mathematically as Ldn is defined as:

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* \*

\* \*

\* \*

\* GRAPHICS MATERIAL IN ORIGINAL DOCUMENT OMITTED \*

\* \*

\* \*

\* \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

3-32

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Time (t) is in seconds, so the

limits shown in hours and minutes are

actually interpreted in seconds.

LA(t) is the time varying value of

A-weighted sound level, the quantity

in decibels measured by an instrument

satisfying requirements of American

National Standard Specification for

Type 1 Sound Level Meters S1.4-1971.

3\. Loud Impulsive Sounds. When loud

impulsive sounds such as sonic

booms or explosions are anticipated

contributors to the noise

environment at a site, the

contribution to day-night average

sound level produced by the loud

impulsive sounds shall have 8

decibels added to it in assessing

the acceptability of a site.

A loud impulsive sound is defined

for the purpose of this regulation

as one for which:

\(i\) The sound is definable as a

discrete event wherein the

sound level increases to a

maximum and then decreases

in a total time interval of

approximately one second or

less to the ambient

background level that exists

without the sound; and

\(ii\) The maximum sound level

(obtained with slow

averaging time and

A-weighting of a Type 1 sound

level meter whose

characteristics comply with

ANSI S1.4-1971) exceeds the

sound level prior to the

onset of the event by at

least 6 decibels; and

\(iii\) The maximum sound level

obtained with fast

averaging time of a sound

level meter exceeds the

maximum value obtained with

slow averaging time by at

least 4 decibels.

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Subpart C

Siting of HUD-Assisted Projects

Near Hazardous Operations Handling

Conventional Fuels or Chemicals

of an Explosive or Flammable Nature

EFFECTIVE DATE: April 2, 1984

SOURCE: Federal Register: February

10, 1984; pp. 5100-5108; March 20,

1984, p. 10253; March 29, 1984, p.

12214

Section

51.200 Purpose

51.201 Definitions

51.202 Approval of HUD-Assisted

Projects

51.203 Safety Standards

51.204 HUD-Assisted Hazardous

Facilities

51.205 Mitigating Measures

51.206 Implementation

51.207 Amendments to Appendix 1

to this Subpart

51.208 Reservation of Administrative

and Legal Rights

Appendix I to Subpart C

Appendix II to Subpart C

Authority: Sec. 2 Housing Act of

1949 (42 U.S.C. 1441); Sec. 7(d)

Department of Housing and Urban

Development Act (42 U.S.C. 3535(d));

Sec. 2, Housing and Urban Development

Act of 1969 (42 U.S.C. 1441(a)).

51.200 PURPOSE

The Department of Housing and

Urban Development finds that it is

necessary to establish standards for

the location of proposed HUD-assisted

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projects near hazardous operations

handling petroleum products or

chemicals of an explosive or fireprone

nature in order to minimize the

possibility of loss of life and

substantial property loss from such

hazards.

The purpose of this subpart is to:

\(a\) Establish safety standards which

can be used as a basis for

calculating acceptable separation

distances (ASD) for HUD-assisted

projects from specific, stationary,

hazardous operations which

store, handle, or process

hazardous substances;

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(b\) Alert those responsible for the \* GRAPHICS \*

siting of HUD-assisted projects \* MATERIAL \*

to the inherent potential dangers \* IN \*

when such projects are located in \* ORIGINAL \*

the vicinity of such hazardous \* DOCUMENT \*

operations; \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(c\) Provide guidance for identifying

those hazardous operations which

are most prevalent;

\(d\) Provide the technical guidance

required to evaluate the degree

of danger anticipated from

explosion and thermal radiation

(fire); and

\(e\) Provide technical guidance

required to determine acceptable

separation distances from such

hazards.

51.201 DEFINITIONS

Acceptable Separation Distance (ASD)

\- means the distance beyond

explosion or combustion of a hazard is

not likely to cause structures or

individuals to be subjected to blast

overpressure or thermal radiation flux

levels in excess of the safety

standards in section 51.203. The ASD

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is determined by applying the safety

standards established by this subpart

to the guidance set forth in HUD

Guidebook, \"Urban Development Siting

With Respect to Hazardous Commercial/

Industrial Facilities.\"

Blast Overpressure - means the

pressure, in pounds per square inch,

in excess of normal atmospheric

pressure on the surrounding medium

caused by an explosion.

Danger Zone - means the land area

circumscribed by the radius which

delineates the ASD of a given hazard.

Department - means the Department of \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Housing and Urban Development (HUD). \* GRAPHICS \*

\* MATERIAL \*

Hazard - means any stationary \* IN \*

container which stores, handles or \* ORIGINAL \*

processes hazardous substances of an \* DOCUMENT \*

explosive or fire prone nature. The \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\* term \"hazard\" does not include
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* GRAPHICS \* pipelines for the transmission of

\* MATERIAL \* hazardous substances, if such

\* IN \* pipelines are located underground or

\* ORIGINAL \* comply with applicable Federal, State

\* DOCUMENT \* and local safety standards. Also

\* OMITTED \* excepted are: (1) containers with a

\*\*\*\*\*\*\*\*\*\*\*\*\* capacity of 100 gallons or less when

they contain common liquid industrial

fuels, such as gasoline, fuel oil,

kerosene and crude oil since they

generally would pose no danger in

terms of thermal radiation or blast

overpressure to a project; and (2)

facilities which are shielded from a

proposed HUD-assisted project by the

topography, because these topographic

features effectively provide a

mitigating measure already in place.

Hazardous Substances - means petroleum

products (petrochemicals) and

chemicals that can produce blast

overpressure or thermal radiation

levels in excess of the standards set

forth in section 51.203. A specific

list of hazardous substances is found

in Appendix 1 to this Subpart.

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HUD-Assisted Project - the

development, construction,

rehabilitation, modernization or

conversion with HUD subsidy, grant

assistance, loan, loan guarantee, or

mortgage insurance, of any project \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

which is intended for residential, \* GRAPHICS \*

institutional, recreational, \* MATERIAL \*

commercial or industrial use. For \* IN \*

purposes of this Subpart the terms \* ORIGINAL \*

\"rehabilitation\" and \"modernization\" \* DOCUMENT \*

refer only to such repairs and \* OMITTED \*

renovation of a building or buildings \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

as will result in an increased number

of people being exposed to hazardous

operations by increasing residential

densities, converting the type of use

of a building to habitation, or making

a vacant building habitable.

Secretary - means the Secretary of

Housing and Urban Development.

Thermal Radiation Level - means the

emission and propagation of heat

energy through space or a material

medium, expressed in BTU per square

foot per hour (BTU/sq. ft. hr.)

51.202 APPROVAL OF HUD-ASSISTED

PROJECTS

\(a\) It is HUD\'s policy that projects \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

receiving HUD assistance will be \* GRAPHICS \*

located in a safe and healthful \* MATERIAL \*

environment. The Department will \* IN \*

not approve an application for \* ORIGINAL \*

assistance for a proposed project \* DOCUMENT \*

located at less than the \* OMITTED \*

acceptable separation distance \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

from a hazard, as defined in section

51.201, unless appropriate

mitigating measures, as defined

in section 51.205, are

implemented, or unless mitigating

measures are already in place.

\(b\) In the case of all applications

for proposed HUD-assisted

projects, the Department shall

evaluate projected development

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plans in the vicinity of these \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

projects to determine whether \* GRAPHICS \*

there are plans to install a \* MATERIAL \*

hazardous operation in close \* IN ORIGINAL \*

proximity to the proposed \* DOCUMENT \*

project. If the evaluation shows \* OMITTED \*

that such a plan exists, the \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Department shall not approve

assistance for the project unless \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

the Department obtains satisfactory \* GRAPHICS \*

assurances that adequate \* MATERIAL \*

mitigating measures will be taken \* IN ORIGINAL \*

when the hazardous operation is \* DOCUMENT \*

installed. \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

51.203 SAFETY STANDARDS

The following standards shall be

used in determining the acceptable

separation distance of a proposed

HUD-assisted project from a hazard:

\(a\) Thermal Radiation Safety

Standard. Projects shall be

located so that:

\(1\) The allowable thermal

radiation flux level at the

building shall not exceed

10,000 BTU/sq. ft. per hr.;

\(2\) The allowable thermal

radiation flux level for

outdoor, unprotected

facilities or areas of

congregation shall not

exceed 450 BTU/sq. ft. per

hour.

\(b\) Blast Overpressure Safety

Standard. Projects shall be

located so that the maximum

allowable blast overpressure at

both buildings and outdoor,

unprotected facilities or areas

shall not exceed 0.5 psi.

\(c\) If a hazardous substance

constitutes both a thermal

radiation and blast overpressure

hazard, the ASD for each hazard

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shall be calculated, and the

larger of the two ASDs shall be

used to determine compliance with

this Subpart.

51.204 HUD-ASSISTED HAZARDOUS

FACILITIES

In reviewing applications for

proposed HUD-assisted projects

involving the installation of

hazardous facilities, the Department \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

shall ensure that such hazardous \* GRAPHICS \*

facilities are located at an \* MATERIAL \*

acceptable separation distance from \* IN \*

residences and from any other facility \* ORIGINAL \*

or area where people may congregate or \* DOCUMENT \*

be present. The mitigating measures \* OMITTED \*

listed in section 51.205 may be taken \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

into account in determining compliance

with this section.

51.205 MITIGATING MEASURES

Application of the standards for

determining an Acceptable Separation

Distance (ASD) for a HUD-assisted

project from a potential hazard of an

explosion or fire prone nature is \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

predicated on level topography with no \* GRAPHICS \*

Intervening object(s) between the \* MATERIAL \*

hazard and the project. Application \* IN ORIGINAL \*

of the standards can be eliminated or \* DOCUMENT \*

modified if: \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

a\. The nature of the topography

shields the proposed project

from the hazard.

b\. An existing permanent fire

resistant structure of

adequate size and strength

will shield the proposed

project from the hazard.

c\. A barrier is constructed

surrounding the hazard, at the

site of the project, or in

between the potential hazard

and the proposed project.

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d\. The structure and outdoor

areas used by people are

designed to withstand blast

overpressure and thermal

radiation anticipated from the

potential hazard (e.g., the

project is of masonry and

steel or reinforced concrete

and steel construction).

51.206 IMPLEMENTATION

This Subpart shall be implemented

for each proposed HUD-assisted project

by the Departmental official responsible

for Departmental review of the

project. The implementation procedure \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

will be part of the environmental \* GRAPHICS \*

assessment process in accordance with \* MATERIAL \*

the procedures set forth in 24 CFR \* IN \*

Part 50 and 24 CFR Part 58. In the \* ORIGINAL \*

case of HUD-assisted projects for \* DOCUMENT \*

which the Department\'s Project \* OMITTED \*

Selection Criteria at 24 CFR Section \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

200.700 et seq. are applicable, the

requirements of this Subpart shall be

implemented by the Departmental

official responsible for determining

compliance with such criteria.

51.207 AMENDMENTS TO APPENDIX I TO

THIS SUBPART

\(a\) The Secretary may prescribe

supplementary substances for

inclusion in Appendix I to this

Subpart without prior notice and

public procedure. Specific

notice of these supplementary

substances, to include the reason

for including the substances,

shall be published in the Federal

Register, in accordance with 5

U.S.C. 552 and 24 CFR 15.11.

Such notice may incorporate these

supplementary substances by

reference. In addition,

discussion of the basis for

including these supplementary

substances will be available for

examination and distribution in

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the Office of Environment and

Energy, Room 7152, Department of

Housing and Urban Development,

451 Seventh Street, SW,

Washington, DC 20410, and in

each HUD Regional and local

office.

\(b\) The Secretary or his designee \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

may, on a case-by-case basis, \* GRAPHICS \*

when circumstances warrant, \* MATERIAL \*

require the application of this \* IN \*

Subpart with respect to a \* ORIGINAL \*

substance not listed in Appendix I \* DOCUMENT \*

to this Subpart that would create \* OMITTED \*

thermal or overpressure effect in \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

excess of that listed in section

51.203.

\(c\) Any interested person may petition

the Secretary for amendment

of Appendix I to this Subpart in

accordance with 24 CFR 10.20.

51.208 RESERVATION OF ADMINISTRATIVE

AND LEGAL RIGHTS

Publication of these standards

does not constitute a waiver of any

right: (a) of HUD to disapprove a

project proposal if the siting is too

close to a potential hazard not

covered by this Subpart, and (b) of

HUD or any person or other entity to

seek to abate or to collect damages

occasioned by a nuisance, whether or

not covered by the Subpart.

Dated February 1, 1984

Samuel R. Pierce, Jr.

Secretary of Housing and

Urban Development

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APPENDIX I - TO SUBPART C

Specific Hazardous Substances

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* GRAPHICS \*

The following is a list of \* MATERIAL \*

specific petroleum products and \* IN \*

chemicals defined to be hazardous \* ORIGINAL \*

substances under section 51.201. \* DOCUMENT \*

\* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

HAZARDOUS LIQUIDS

Acetic Acid

Acetic Anhydridge

Acetone

Acrylonitrile

Amyl Acetate

Amyl Alcohol

Benzene

Butyl Acetate

Butyl Acrylate

Butyl Alcohol

Carbon Bisulfide

Carbon Disulfide

Cellosolve

Cresols

Crude Oil (Petroleum)

Cumene

Cyclohexane

No. 2 Diesel Fuel

Ethyl Acetate

Ethyl Acrylate

Ethyl Alcohol

Ethyl Benzene

Ethyl Dichloride

Ethyl Ether

Gasoline

Heptane

Hexane

Isobutyl Acetate

Isobutyl Alcohol

Isopropyl Acetate

Isopropyl Alcohol

Jet Fuel & Kerosene

Methyl Alcohol

Methyl Amyl Alcohol

Methyl Cellosolve

Methyl Ethyl Ketone

Naptha

Pentane

Propylene Oxide

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Toluene

Vinyl Acetate

Xylene

HAZARDOUS GASES

Acetaldehyde

Butadiene

Butane

Ethene

Ethylene

Ethylene Oxide

Hydrogen

Liquefied Natural Gas (LNG)

Liquefied Petroleum Gas (LPG)

Propane

Propylene

Vinyl Chloride

(Primary Source: \"Urban Development

Siting with respect to Hazardous

Commercial/Industrial Facilities,\" by

Rolf Jensen and Associates, Inc.,

April 1982)

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APPENDIX II - TO SUBPART C

Development of Standards;

Calculation Methods

I. Background Information Concerning

The Standards:

\(a\) Thermal Radiation

\(1\) Introduction. Flammable

products stored in above

ground containers

represent a definite,

potential threat to

human life and

structures in the event

of fire. The resulting

fireball emits thermal

radiation which is

absorbed by the

surroundings. Combustible

structures, such as

wooden houses, may be

ignited by the thermal

radiation being

emitted. The radiation

can cause severe burn,

injuries and even death

to exposed persons some

distance away from the

site of the fire.

\(2\) Criteria for Acceptable

Separation Distance

(ASD). Wooden

buildings, window drapes

and trees generally

ignite spontaneously

when exposed for a

relatively long period

of time to thermal

radiation levels of

approximately 10,000

BTU/hr. sq. ft. It will

take 15 to 20 minutes

for a building to ignite

at that degree of

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thermal intensity.

Since the reasonable

response time for fire

fighting units in

urbanized areas is

approximately 5 to 10

minutes, a standard of

10,000 BTU/hr. sq. ft.

is considered an

acceptable level of

thermal radiation for

buildings.

People in outdoor areas

exposed to a thermal

radiation flux level of

approximately 1,500

BTU/sq. ft. hr will suffer

intolerable pain after

15 seconds. Longer

exposure causes blistering,

permanent skin

damage, and even death.

Since it is assumed that

children and the elderly

could not take refuge

behind walls or run away

from the thermal effect

of the fire within the

15 seconds before skin

blistering occurs,

unprotected (outdoor)

areas, such as playgrounds,

parks, yards,

school grounds, etc.,

must be placed at such a

distance from potential

fire locations so that

the radiation flux level

is well below 1500

BTU/sq. ft. hr. An

acceptable flux level,

particularly for elderly

people and children, is

450 BTU/sq. ft. hr. The

skin can be exposed to

this degree of thermal

radiation for 3 minutes

or longer with no

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serious detrimental

effect. The result

would be the same as a

bad sunburn. Therefore,

the standard for areas

in which there will be

exposed people, e.g.

outdoor recreation areas

such as playgrounds and

parks, is set at 450

BTU/hr. sq. ft. Areas

covered also include

open space ancillary to

residential structures,

such as yard areas and

vehicle parking areas.

\(3\) Acceptable Separation

Distance From a

Potential Fire Hazard.

This is the actual

setback required for the

safety of occupied

buildings and their

inhabitants, and people

in open spaces (exposed

areas) from a potential

fire hazard. The

specific distance

required for safety from

such a hazard depends

upon the nature and the

volume of the substance.

The Technical

Guidebook entitled

\"Urban Development

Siting With Respect to

Hazardous/Commercial

Industrial Facilities,\"

which supplements this

regulation, contains the

technical guidance

required to compute

Acceptable Separation

Distances (ASD) for

those flammable

substances most often

encountered.

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\(b\) Blast Overpressure

The Acceptable Separation

Distance (ASD) for people and

structures from materials

prone to explosion is dependent

upon the resultant blast

measured in pounds per square

inch (psi) overpressure. It

has been determined by the

military and corroborated by

two independent studies

conducted for the Department

of Housing and Urban

Development that 0.5 psi is the

acceptable level of blast

overpressure for both buildings

and occupants, because a

frame structure can normally

withstand that level of

external exertion with no

serious structural damage,

and it is unlikely that human

beings inside the building

would normally suffer any

serious injury. Using this

as the safety standard for

blast overpressure, nomographs

have been developed

from which an ASD can be

determined for a given

quantify of hazardous substance.

These nomographs are

contained in the handbook

with detailed instructions on

their use.

\(c\) Hazard evaluation

The Acceptable Separation

Distances for buildings,

which are determined for

thermal radiation and blast

overpressure, delineate

separate identifiable danger

zones for each potential

accident source. For some

materials the fire danger

zone will have the greatest

radius and cover the largest

area, while for others the

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explosion danger zone will be

the greatest. For example,

conventional petroleum fuel

products stored in unpressurized

tanks do not emit

blast overpressure of

dangerous levels when

ignited. In most cases,

hazardous substances will be

stored in pressurized

containers. The resulting

blast overpressure will be

experienced at a greater

distance than the resulting

thermal radiation for the

standards set in section

51.203. In any event the

hazard requiring the greatest

separation distance will

prevail in determining the

location of HUD-assisted

projects.

The standards developed for

the protection of people and

property are given in the

following table.

THERMAL RADIATION BLAST OVERPRESSURE

Amount of acceptable

exposure allowed for

building structures 10,000 BTU/sq. ft.-hr 0.5 psi

Amount of acceptable

exposure allowed for

people in open areas 450 BTU/sq. ft.-hr 0.5 psi

Problem Example:

The following example is given as

a guide to assist in understanding how

the procedures are used to determine

an acceptable separation distance.

The technical data are found in the

HUD Guidebook. Liquid propane is used

in the example since it is both an

explosion and a fire hazard.

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In this hypothetical case a

proposed housing project is to be

located 850 feet from a 30,000 gallon

liquid propane (LPG) tank. The

objective is to determine the acceptable

separation distance from the LPG

tank. Since propane is both explosive

and fire prone it will be necessary to

determine the ASD for both explosion

and for fire. The greatest of the two

will govern. There is no dike around

the tank in this example.

Nomographs from the technical

Guidebook have been reproduced to

facilitate the solving of the problem.

ASD For Explosion:

Use Figure 1 to determine the

acceptable separation distance for

explosion.

The graph depicted on Figure 1 is

predicated on a blast overpressure of

0.5 psi.

The ASD in feet can be determined

by applying the quantity of the hazard

(in gallons) to the graph.

In this case locate the 30,000

gallon point on the horizontal axis

and draw a vertical line from that

point to the intersection with the

straight line curve. Then draw a

horizontal line from the point where

the lines cross to the left vertical

axis where the ACCEPTABLE SEPARATION

DISTANCE of 660 feet is found.

Therefore the ASD for explosion is

660 feet.

Since the proposed project site is

located 850 feet from the tank it is

located at a safe distance with

regards to blast overpressure.

3-49

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

ACCEPTABLE SEPARATION DISTANCE

BLAST OVERPRESSURE

(NO BLAST BARRIERS)

HAZARDOUS GAS CONTAINER

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* GRAPHICS MATERIAL IN ORIGINAL DOCUMENT OMITTED \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Figure 1

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ASD For Fire:

To determine the ASD for fire it \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

will be necessary to first find the \* GRAPHICS \*

fire width (diameter of the fireball) \* MATERIAL \*

on Figure 2. Then apply this to \* IN \*

Figure 3 to determine the ASD. \* ORIGINAL \*

\* DOCUMENT \*

Since there are two safety \* OMITTED \*

standards for fire: (a) 10,000 \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

BTU/sq. ft. hr. for buildings; and (b)

450 BTU/sq. ft. hr. for people in exposed

areas, it will be necessary to

determine an ASD for each.

To determine the fire width locate

the 30,000 gallon point an the

horizontal axis on Figure 2 and draw a

vertical line to the straight line

curve. Then draw a horizontal line

from the point where the lines cross

to the left vertical axis where the

FIRE WIDTH is found to be 350 feet.

Now locate the 350 ft. point on

the horizontal axis of Figure 3 and

draw a vertical line from that point

to curves 1 and 2. Then draw

horizontal lines from the points where

the lines cross to the left vertical

axis where the ACCEPTABLE SEPARATION

DISTANCES of 240 feet for buildings

and 1150 feet for exposure to people

is found.

Based on this the proposed project

site is located at a safe distance

from a potential fire ball. However,

exposed playgrounds or other exposed

areas of congregation must be at least

1150 feet from the tank, or be

appropriately shielded from a potential

fireball.

(Source: HUD Handbook, \"Urban

Development Siting With Respect to

Hazardous Commercial/Industrial

Facilities.\")

3-51

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

FIRE WIDTH - UNCONFINED SPILL

HAZARDOUS GAS CONTAINER

NOT DIKED

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* GRAPHICS MATERIAL IN ORIGINAL DOCUMENT OMITTED \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Figure 2

3-52

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ACCEPTABLE SEPARATION DISTANCE

HAZARDOUS GAS CONTAINER

DIKED/UNDIKED

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* GRAPHICS MATERIAL IN ORIGINAL DOCUMENT OMITTED \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

\* \*

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Figure 3

3-53

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Subpart D

Siting of HUD Assisted Projects

in Runway Clear Zones at Civil

Airports and Clear Zones and

Accident Potential Zones at

Military Airfields

EFFECTIVE DATE: March 5, 1984.

SOURCE: Federal Register: January 6,

1984; pp. 877-881

51.300 Purpose

51.301 Definitions

51.302 Coverage

51.303 General Policy

51.304 Responsibilities

51.305 Implementation

Authority: Section 2 of the Housing

Act of 1949 as amended, 42 U.S.C

1441, affirmed by Section 2 of the

Housing and Urban Development Act of

1969, P.L. No. 90-448; Section 7(d) of

the Department of Housing and Urban \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Development Act of 1965, 42 U.S.C. \* GRAPHICS \*

3535(d); Office of Management and \* MATERIAL \*

Budget, Federal Management Circular \* IN ORIGINAL \*

75-2: Compatible Land Uses At Federal \* DOCUMENT \*

Airfields. \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

51.300 PURPOSE

\(a\) The Department of Housing and

Urban Development finds that HUD

assisted or insured projects aid

their occupants in Runway Clear

Zones, Clear Zones and Accident

Potential Zones are exposed to a

significant risk of personal

injury or property damage from

aircraft accidents.

\(b\) It is the purpose of this Subpart

to promote compatible land uses

around civil airports and

military airfields by identifying

suitable land uses for Runway

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Clear Zones at civil airports and

Clear Zones and Accident Potential

Zones at military airfields

and by establishing them as

standards for providing HUD

assistance, subsidy or insurance.

51.301 DEFINITIONS: For the purposes

of this regulation, the following

definitions apply:

\(a\) Accident Potential Zone. An area

at military airfields which is

beyond the Clear Zone. The

standards for the Accident

Potential Zones are set out in \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Department of Defense Instruction \* GRAPHICS \*

4165.57, \"Air Installations \* MATERIAL \*

Compatible Use Zones,\" November \* IN ORIGINAL \*

8, 1977, 32 CFR Part 256. There \* DOCUMENT \*

are no Accident Potential Zones \* OMITTED \*

at civil airports. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(b\) Airport Operator. The civilian

or military agency, group or

individual which exercises

control over the operations of

the civil airport or military

airfield.

\(c\) Civil Airport. An existing \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

commercial service airport as \* GRAPHICS \*

designated in the National Plan \* MATERIAL \*

of Integrated Airport Systems \* IN ORIGINAL \*

prepared by the Federal Aviation \* DOCUMENT \*

Administration in accordance with \* OMITTED \*

Section 504 of the Airport and \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Airway Improvement Act of 1982.

\(d\) Runway Clear Zones and Clear

Zones. Areas immediately beyond

the ends of a runway. The \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

standards for Runway Clear Zones \* GRAPHICS \*

for civil airports are established \* MATERIAL \*

by FAA regulation 14 CFR \* IN ORIGINAL \*

Part 152. The standards for \* DOCUMENT \*

Clear Zones for military airfields \* OMITTED \*

are established by DOD \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Instruction 4165.57, 32 CFR Part

256\.

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51.302 COVERAGE: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* GRAPHICS \*

\(a\) These policies apply to HUD \* MATERIAL \*

programs which provide assistance, \* IN ORIGINAL \*

subsidy or insurance for \* DOCUMENT \*

construction, land development, \* OMITTED \*

new communities, community \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

development or redevelopment or

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* any other provision of facilities

\* GRAPHICS \* and services which are designed

\* MATERIAL \* to make land available for

\* IN ORIGINAL \* construction. When the HUD

\* DOCUMENT \* assistance, subsidy or insurance

\* OMITTED \* is used to make land available

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* for construction rather than for

the actual construction, the

provision of the HUD assistance,

subsidy or insurance shall be

dependent upon whether the

facility to be built is itself

acceptable in accordance with the

standards in section 51.303.

\(b\) These policies apply not only to

new construction but also to

substantial or major modernization

and rehabilitation and to

any other program which

significantly prolongs the physical or

economic life of existing

facilities or which, in the case

of Accident Potential Zones:

\(1\) Changes the use of the \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

facility so that it becomes \* GRAPHICS \*

one which is no longer \* MATERIAL \*

acceptable in accordance with \* IN ORIGINAL \*

the standards contained in \* DOCUMENT \*

section 51.303(b); \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(2\) Significantly increases the

density or number of people

at the site; or

\(3\) Introduces explosive, flammable

or toxic materials to

the area.

\(c\) Except as noted in section

51.303(a)(3), these policies do

not apply to HUD programs where

3-56

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the action only involves the

purchase, sale or rental of an

existing property without

significantly prolonging the

physical or economic life of the

property.

\(d\) The policies do not apply to

research or demonstration

projects which do not result in

new construction or reconstruction,

to interstate land sales

registration, or to any action or

emergency assistance which is

provided to save lives, protect

property, protect public health

and safety, or remove debris and

wreckage.

51.303 GENERAL POLICY: It is HUD\'s

general policy to apply standards to

prevent incompatible development

around civil airports and military

airfields.

\(a\) HUD policy for actions in Runway

Clear Zones and Clear Zones.

\(1\) HUD policy is not to provide

any assistance, subsidy or

insurance for projects and

actions covered by this part

except as stated in section

51.303 (a)(2) below.

\(2\) If a project proposed for HUD

assistance, subsidy or

insurance is one which will

not be frequently used or

occupied by people, HUD

policy is to provide

assistance, subsidy or

insurance only when written \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

assurances are provided to \* GRAPHICS \*

HUD by the airport operator \* MATERIAL \*

to the effect that there are \* IN ORIGINAL \*

no plans to purchase the land \* DOCUMENT \*

involved with such facilities \* OMITTED \*

as part of a Runway Clear \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Zone or Clear Zone

acquisition program.

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\(3\) Special notification requirements

for Runway Clear Zones \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

and Clear Zones. In all \* GRAPHICS \*

cases involving HUD assistance, \* MATERIAL \*

subsidy, or insurance \* IN ORIGINAL \*

for the purchase or sale of \* DOCUMENT \*

an existing property in \* OMITTED \*

Runway Clear Zone or Clear \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Zone, HUD (or the Grant

Recipient under Title I of

the Housing and Community \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Development Act of 1974, as \* GRAPHICS \*

amended, 42 U.S.C. 5301 et \* MATERIAL \*

seq.) shall advise the buyer \* IN ORIGINAL \*

that the property is in a \* DOCUMENT \*

Runway Clear Zone or Clear \* OMITTED \*

Zone, what the implications \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

of such a location are, and

that there is a possibility

that the property may, at a \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

later date, be acquired by \* GRAPHICS \*

the airport operator. The \* MATERIAL \*

buyer must sign a statement \* IN ORIGINAL \*

acknowledging receipt of this \* DOCUMENT \*

information. \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(b\) HUD policy for actions in

Accident Potential Zones at

Military Airfields. HUD policy

is to discourage the provision of

any assistance, subsidy or

insurance for projects and

actions in the Accident Potential

Zones. To be approved, projects

must be generally consistent with \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

the recommendations in the Land \* GRAPHICS \*

Use Compatibility Guidelines For \* MATERIAL \*

Accident Potential Zones chart \* IN ORIGINAL \*

contained in DOD Instruction \* DOCUMENT \*

4165.57, 32 CFR Part 256. \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

51.304 RESPONSIBILITIES

\(a\) The following persons have the

authority to approve actions in

Accident Potential Zones:

\(1\) For Title I of the Housing

and Community Development Act

of 1974, as amended, 42

U.S.C. 5301 et seq: the

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certifying officer of the

grant recipient as defined in

Part 58 of this Title.

\(2\) For all other HUD programs:

the program personnel having

approval authority for the

project.

\(b\) The following persons have the

authority to approve actions in

Runway Clear Zones and Clear

Zones:

\(1\) For Title I of the Housing

and Community Development Act

of 1974, as amended, 42

U.S.C. 5301 et seq: The

certifying officer of the

grant recipient as defined in

Part 58 of this Title.

\(2\) For all other HUD programs:

the Regional Administrator.

51.305 IMPLEMENTATION

\(a\) Projects already approved for

assistance. This regulation does \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

not apply to any project approved \* GRAPHICS \*

for assistance prior to the \* MATERIAL \*

effective date of the regulation \* IN ORIGINAL \*

whether the project was actually \* DOCUMENT \*

under construction at that date \* OMITTED \*

or not. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\(b\) Acceptable data on Runway Clear \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Zones, Clear Zones and Accident \* GRAPHICS \*

Potential Zones. The only Runway \* MATERIAL \*

Clear Zones, Clear Zones and \* IN ORIGINAL \*

Accident Potential Zones which \* DOCUMENT \*

will be recognized in applying \* OMITTED \*

this part are those provided by \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

the airport operators and which

for civil airports are defined in

accordance with FAA regulations

14 CFR Part 152 or for military

airfields, DOD Instruction

4165.57, 32 CFR Part 256. All

data, including changes, related

to the dimensions of Runway Clear

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Zones for civil airports shall be

verified with the nearest FAA

Airports District Office before

use by HUD.

\(c\) Changes in Runway Clear Zones,

Clear Zones, and Accident

Potential Zones. If changes in

the Runway Clear Zones, Clear

Zones or Accident Potential Zones

are made, the field offices shall

immediately adopt these revised

zones for use in reviewing

proposed projects.

\(d\) The decision to approve projects

in the Runway Clear Zones, Clear

Zones and Accident Potential \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Zones must be documented as part \* GRAPHICS \*

of the environmental assessment \* MATERIAL \*

or, when no assessment is \* IN ORIGINAL \*

required, as part of the project \* DOCUMENT \*

file. \* OMITTED \*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Dated: December 30, 1983

Samuel R. Pierce, Jr.

Secretary of Housing and

Urban Development

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