HomeMy WebLinkAbout17-Public Works
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CITY OF
SAN
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B ERN A R DIN 0
INTEROFFICE MEMORANDUM
TO: SHAUNA CLARK, City Clerk
FROM: ROGER G. HARDGRAVE, Director Public Works/City Engineer
SUBJECT: Ordinance of Liquefaction
DATE: September 8, 1989
FILE NO: 6.50
---------------------------------~--------------------------------
The first reading of this ordinance was done at the Council Meeting
of July 17, 1989. The final reading was on the agenda for the
Council Meeting of July 24, 1989, but was not adopted due to the
determination by the City Attorney's Office that it needed
environ~ental review.
The Environmental Review Committee has recommended that a Negative
Declaration be adopted. This action will be on the Council Agenda
,for September 18, 1989. Please have the final reading of the
ordinance on this agenda, in order that this issue can be
finalized.
We will attempt to get the resol uti on, also, on the agenda for the
next meeting.
HARDGRAVE
of Public Works/City Engineer
RGH:pa
cc: Marshall Julian, City Administrator
H: ld g~ cBS 69,
~~3l~) ), Ii:HJ.:l^13:)3~
/1
. CITY OF SAN BERNQRDINO - RatQU"ESi'~;rCOUNCIL ACTION
..........~., ....
From: ROGER G. HARDGRAVEP,[~,"J,-:":-
Dept: Public Works/Engin~~iUt4 --
Date: 8-31-89
- ,.- Adoption of Negative Declaration &
Subject: Finding of Consistency with the
General Plan - Proposed Liquefac-
tion Ordinance and Proposed Lique-
faction Resolution
Synopsis of Previous Council action:
08-16-82 -- Resolution No. 82-345 adopted to establish procedures
'arid guidelines for evaluating the hazard of liquefac-
tion of soils.
03-23-89 -- Legislative Review Committee reviewed proposed pro-
cedures and guidelines for evaluating liquefaction
potential. Concern was expressed over reference to
Water Department maps. Item continued.
07-17-89 -- Ordinance of the City of San Bernardino dealing with
liquefaction and requirements for development. Laid
over for ERC.
08-07-89 -- Resolution of the City of San Bernardino adopting
procedures and guidelines for liquefaction investiga-
tions, referred to ERC.
Recommended motion:
1. That the Negative Declaration for the proposed Liquefaction
Ordinance and proposed Liquefaction Resolution, be adopted.
2. That a finding be made that the proposed Liquefaction Ordinance
and proposed Liquefaction Resolution are consistent with the
General Plan.
cc: Marshall Julian
Jim Richardson
Jim Penman
~;rad Kilger
~ erb Wessel
a ..~A-
~ '
Contact person: Roger G. Hardgrave Phone:
Memo, Staff Report, Initial
Supporting data attached: Study & Negative Declaration Ward:
5025
All
FUNDING REQUIREMENTS:
Amount:
N/A
Source: (Acct, No,)
(Acct, Descriotion)
Finance:
Council Notes:
75.0262
Aqenda Item No.
Jl!I!.
-
. CITY OF SAN BERNQRDINO - REQUEST lOR COUNCIL ACTION
STAFF REPORT
The Negative Declaration for the proposed liquefaction
ordinance was recommended for adoption by the Environmental Re-
view Committee at its meeting of 8-03-89.
A 14-day public review period was afforded, from 8-10-89
through 8-23-89. No comments were received.
The Negative Declaration for the proposed liquefaction
resolution was recommended for adoption by the Environmental
Review Committee at its meeting of 8-10-89.
A 14-day public review period was afford~d, from 8-17-89
through 8-30-89. No comments were received.
We recommend that the Negative Declaration be adopted and
a finding made that the proposed liquefaction ordinance and the
proposed liquefaction resolution are consistent with the General
Plan.
8-31-89
. 75-0264
o
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ORDINANCE NO.
2 AN ORDINANCE OF THE CITY OF SAN BERNARDINO ADDING CHAPTER
15.08 DEALING WITH LIQUEFACTION AND REQUIREMENTS FOR DEVELOPMENT
3 IN SUSCEPTIBLE AREAS.
4 THE MAYOR AND COMMON COUNCIL OF THE CITY OF SAN BERNARDINO
DO ORDAIN AS FOLLOWS:
5
SECTION 1.
Chapter 15.08 is added to the San Bernardino
6
Municipal Code as follows:
7
8
"Chapter 15.08
LIQUEFACTION
9 15.08.010 Findings.
10 Local governing bodies are required to adopt pOlicies for
11 the protection of the community against geologic and seismic
12 hazards pursuant to California Government Code Section 65302.
13 The primary geologic and seismic hazards that could potentially
14 affect San Bernardino include fault rupture, ground shaking,
15 historic high ground water, and soil matrix. These hazards could
16 cause liquefaction resulting in extensive property damage and
17
loss of life in susceptible areas of the City.
Liquefaction
18 reports plus mitigation measures for new development in
19 susceptible areas will greatly reduce the risk o.f damage from
20 liquefaction induced building failures during an earthquake
21 occurrence.
22 15.08.020 Purpose.
23 The purpose of this code is to reduce the potential risk of
24 property damage and loss of life due to liquefaction induced
25 building failures during an earthquake occurrence by requiring
26 liquefaction reports and mitigation measures for development in
27 areas susceptible to liquefaction within this jurisdiction.
28
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July 10, 1989
1
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1 15.08.030 Scope-Map.
2
A Map is included in the General Plan indicating areas of
3
liquefaction susceptibility.
All new development projects, or
4 structural modifications over twenty-five percent (25%) of the
5 building area, which are located within the areas of liquefaction
6 susceptibility as determined by the latest adopted edition of the
7 General Plan Map (Map) may be required to provide liquefaction
8
reports and mitigation measures.
The liquefaction
9 susceptibility areas indicated on the map have a historic high
10 ground water table within thirty (30) feet of the surface.
11 15.08.040 Liquefaction Defined.
12
Liquefaction is defined as th~ transformation of a
13 granular material from a solid state into a liquefied state as a
14 consequence of increased pore-water pressures. Soils and clastic
15 sediment with particle size in the medium sand to silt range, as
16 determined by the Unified Soils Classification System, are
17 particularly susceptible to liquefaction when they are saturated
18 with water and shaken by an earthquake. Liquefaction at or near
19 the surface can result in foundation failure and property
20 damage.
21 15.08.050 Reports Required.
22
23
24
25
26
27
28
A.
A liquefaction report plus mitigation measures
prepared by a Registered Civil Engineer shall be required
by the Director of Public Works/City Engineer for new
construction or structural modification of more than
twenty-five percent (25%) of the building area for the
buildings or structures listed below which fall within the
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July 10, 1989
2
.
10
11
12
13
14
15
16
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24
25
26
27
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high liquefaction susceptibility areas as indicated on the
2
Map:
3
4
1.
Essential facilities, as defined in Section
2312(K) of the Uniform Building Code, including but
5
not limited to hospitals and other emergency medical
facilities, fire and police stations, and government
6
7
disaster operation and communication centers.
8
2.
Buildings where the primary occupancy is for
9
assembly use for more than fifty (50) persons in one
room.
3.
Buildings over two stories in height.
4.
Buildings with the following occupancies, as
listed in the Uniform Building Code:
a.
Group A, (Assembly) Divisions 1, 2 and
2.1;
b.
Group E, (Educational) Division 1;
c.
Group H, (High Hazard) Divisions 1 and
2; and
d.
Group I, (Institutional) Divisions 1
and 2.
5.
Buildings with an occupant load of more than
300, as determined by Table 33-A of the Uniform
Building Code.
6.
Underground tanks of more than 5,000
gallons, for storage of toxic, hazardous or flammable
materials.
7.
Tanks with a height of more than 35 feet.
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July 10, 1989
3
.
10
11
12
13
14
15
16
17
18
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8.
Towers with a height more than 35 feet.
2
B.
A liquefaction report plus mitigation measures
3
prepared by a Registered Civil Engineer may be required by
4
the Director of Public Works/City Engineer for new
5
construction or structural modification of more than
6
7
twenty-five percent (25%) of the building area for the
buildings or structures listed below, which fall within the,
8
9
moderately high to moderate liquefaction susceptibility
areas as indicated on the Map:
1.
Essential facilities, as defined in Section
2312(K) of the Uniform Building Code, including but
not limited to hospitals and other emergency medical
facilities, fire and pOlice stations, and government
disaster operation and communication centers.
2.
All structures listed in Subsection
15.08.050A, when the Director of Public Works/City
Engineer determines a report is needed based on
current data.
19 15.08.060 Exemptions.
20 The following buildings and structures shall be exempt
21 from providing a liquefaction report:
22
23
24
25
26
27
28
1.
A single-family wood frame detached
residential structure.
2.
A two-dwelling unit wood frame single-story
attached residential structure.
3.
Additions up to twenty-five percent (25%) of
the area of the original structure, except when the
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July 10, 1989
4
12
13
14
15
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addition increases the occupancy to a level requiring
2
a report under Section 15.08.050.
3
4.
One or two story wood frame structures,
4
whose occupancy is not listed in Section 15.08.050.
5
5.
A non-essential structure, where the
6
developer has assumed the site will liquefy and has
7
designed for liquefaction. Plans must be signed by a
8
Registered Civil Engineer and contain a statement to
9
the effect that the building has been des,igned to
10
withstand liquefaction.
11
6.
Underground storage tanks of 5,000 gallon
capacity or more that are designed and installed with
flexible couplings and other features designed to
provide tank integrity and prevent leakage during
seismic events.
16 15.08.070 Administration and Enforcement.
17
18 promulgate written procedures, regulations, guidelines and fees
The Director of Public Works/City Engineer shall
19 pertaining to the implementation and enforcement of this chapter.
20 Such procedures, regulations, guidelines and fees shall not
21 become effective until they have been approved by the Mayor and
22 Common Council.
23 15.08.080 Compliance Required Prior to Issuance of Permits.
24 Any person; business, organization or corporation failing
25 to provide the required liquefaction reports and mitigation
26 measures to the Director of Public WorkS/City Engineer in
27 compliance with this chapter shall be denied issuance of grading
28
PZ/dys
July 10, 1989
5
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1 and building permits.
2 .15.08.090 Appeal.
3 Any interested person aggrieved by the determination of the
4 Director of Public Works/City Engineer may appeal the decision
5 to the Mayor and Common Council in accordance with the
6 provisions of Chapter 2.64 of this Code."
7 I HEREBY CERTIFY that the foregoing ordinance was duly
8 adopted by the Mayor and Common Council of the City of San
, 9 Bernardino at a meeting thereof, held on the
10 day of , 1989, by the following vote, to wit:
11 AYES: Council Members
12
13
14
15
16
17
18
19
20
NAYS:
ABSENT:
City Clerk
The foregoing ordinance is hereby approved this
day
of
, 1989.
W. R. Holcomb, Mayor
21 Ci ty of San Bernardino
22 Approved as to form
and legal content:
23
JAMES F. PENMAN,
24 City Attorney
25
26
27
28
/1
BY:.; f1/v.....- 'I
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:-:Gf~';}r nfi-t~ ~.::;.
NOTICE OF PREPARATION OF NEGATIVE DECLARATION
OF ENVIRONMENTAL IM~UG ~8 AM~j :1;
THE CITY OF SAN BERNARDINO proposes to adopt a Negative Declaration
for the following projects. The Environmental Review Committee
found that the project will not have a significant effect on the
environment on the basis of the Initial Study and mitigation
measures (If applicable).
1. REVIEW OF PLANS NO. 89-33 - To construct a 21,283 square foot
auto dealership on a .2.4 acre site located on the southeast
corner of Auto Plaza Drive and Showcase Drive Sonth in a CR-4,
Regional Commercial designation.
2. AMENDMENT TO TEXT 89-1 FOOTHILL VIEW ORDINANCE - To establish
design criteria for protecting viewsheds in the foothill areas.
5. CONDITIONAL USE PERMIT NO. 89-21 - To convert a single-family
residence into a Child day care center on a 1.44 acre site
located at 2424 Kendall Drive.
6.
TENTATIVE TRACT NO. 13656 - To subdivide 12 acres into 39
single-family lots and one remainder parcel located at the
northeast corner of Meridian and Esparanza Streets.
~
PROPOSED LIQUEFACTION ORDINANCE - The City is proposing a
liquefaction ordinance to replace the existing resolution and
provide enabling legislation for enforcement that includes a new
Finding and Purpose statement and establishes thresholds and
exemptions for projects within liquefaction areas.
Copies of the Initial Study are available for public review at the
Planning Department, 300 North "D" Street, San Bernardino, CA
92418, and the Feldheym Library, 555 West 6th Street, San Bernar-
dino, CA. Any environmental comments you have should be received
in this office no later than 4:00 p.m., August 23, 1989. If you do
not respond in writing, we will assume that you have no opinions
and/or recommendations on the above projects.
SUBMITTED: August 8, 1989
PUBLISH: August 10, 1989
CITY OF SAN BERNARDINO PLANNING DEPARTMENT
300 North "D" Street
San Bernardino, CA 92418
384-5057
CP
C5 NOPND8389
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CITY OF SAN BERNARDINO
r
DEPARTMENT OF PUBLIC WORKS/CITY ENGINEER
INITIAL STUDY
"'I
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Liquefaction Ordinance
An Ordinance of the City of San Bernardino to reg-
ulate issuance of building permits in areas of the
City of San Bernardino which have been identified
in the City's General Plan as having a high or mod-
erately high' to moderate potential for Liquefact5.on
in a major earthquake.
July 28, 1989
Prepared for:
Department of PubEc WorKs/City Engineer
Prepared by:
MICHAEL W. GRUBBS
publ ic Works/Engineed.ng
City of San Bernardino
o
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CITY OF SAN BERNARDINO
DEPARTMENT OF PUBLIC WORKS/CITY ENGINEER
INITIAL STUDY
"'"
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Liquefaction is the phenomenon of Soil behaving ,as a
liquid during a major earthquake. Studies have shOlm
that liquefaction is most likely to occur during bigh
groundwater conditions in non-cohesive soils (medium
sands and silts). During a liquefaction event, soils
lose a portion or all of their ability to support loads
sometimes resulting in upset and/or failure of building
foundations in the liquefaction area.
The General Plan has attempted to identify areas of the
city which have a high (H) or moderately high to moderate-
(MHM) potential for liquefaction in the event of a major
earthquake. This determination was almost exclusively
based on the depth to the historic highest groundwater
elevation. Soil conditions were not considered and, in
fact, many lots within the Hand MHM areas are not .subject
to liquefaction because soil conditions prelude it oc-
curring even in years of high groundwater.
Since 1982, regulation of development within moderate
and high liquefaction potential areas has been carried
out under Resolution No. 82-345, which requires that a,
liquefaction report be prepared for all new developments
in the city determined high to moderate zones (zones A &
B) except single family wood frame detached, two unit
wood frame single story and additions up to 25% of the
.original.
Resolution No. 82-345 was written after the 1978-80
floods and was based on limited experience. In work-
ing with it over the years we have found it to be over-
ly restrictive and, in some cases, unreasonable. Also,
the requirements of the report were inadequate.
Th~ proposed ordinance is a re-writ~ of Resolution No.
82-345 to provide additional exemptions where reason-
able and to tighten the requirements of the report.
Also, the proposal ordinence uses the liquefaction
potential map now part of the general plan rather than
the original city developed map. '
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41
Jd1
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CITY OF SAN BERNARDINO
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ENVIRONMENTAL IMPACT CHECKLIST
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A. BACKGROp]D
Application Number:
Project Description: Ordinance to reg1l1atp nf'vf'lnpmpnt within
areas of the city which have been identified as having high or
moderately high to moderate orobabilitv of liquefaction in a
major earthguake.
Location: AIl land within the area of the ~ity inpntifipn in
the General Plan as having a high or moderately high to mnnpratf'
potential of liquefaction in a major earthquake.
Environmental Constraints Areas: Non9
General Plan Designation:
, Various
Zoning Designation:
Various
B. ~HVIEONM~NTAL IMPACTS Explain answers, where appropriate, on a
separate attached sheet.
1. Ea~~h Resources Will the proposal result in:
Yes
No
Maybe
a.
Earth
fill)
more?
movement (cut and/or
of 10,000 cubic yards or
x
,
b. Development and/or grading on
a slope greater than 15%
natural grade?
x
c.
Development
Alquist-Priolo
Zone?
within the
Special Studies
x
d. Modification of any unique
geologic or physical feature?
x
\.
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REVISED 12/87
PAGE 1 OF 8
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Maybe
""
e. Soil erosion on or off the
project site?
f. Modification of a channel,
creek or river?
g.
Development
subject
mudslides,
other similar
within an area
to landslides,
liquefaction or
hazards?
h. Other?
2. bIR_RESOURCES: Will the proposal
result in:
a.
air
upon
emissions or
ambient air
Substantial
an effect
, quality?
b. The creation of objectionable
odors?
c. Development within a high wind
hazard area?
3.
W!!TEE_ RESOURCES:
proposal result in:
Will
the
a. Changes in absorption rates,
drainage patterns, or the rate
and amount of surface runoff
due to impermeable surfaces?
b. Changes in the course or flow
of flood waters?
c. Discharge into surface waters
or any alteration of surface
water quality?
d. Change in the quantity or
quality of ground waters?
e. Exposure of people or property
to flood hazards?
f. Other?
Yes
No
~ ~
x
x
x
x
x
x
x
x
x
x
x
REVISED 12/87 PAGE 2 OF 8
o
o
,.
Maybe
"'"
4.
BIOLOGICAL R~SOURC~~:
proposal result in:
Could the
a.
Change
unique,
species
habitat
trees?
in the number of any
rare or endangered
of plants or their
including stands of
in the number of any
rare or endangered
of animals or their
5. NOISE: Could the proposal result
in:
,
\..
b.
Change
unique,
species
habitat?
a. Increases in existing noise
levels?
Yes
No
x
x
x
x
x
x
x
x
x
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REVISED 10/87
PAGE 3 OF 8
c. Other?
b. Exposure of people to exterior
noise levels over 65 dB or
interior noise levels over 45
dB?
c. Other?
6.
LAND_ USE:
result in:
a.
A change in
designated
Plan?
Will the
proposal
the land use as
on the General
b. Development within an Airport
District?
c. ,Development within "Greenbelt"
Zone A,B, or C?
d. Development within a high fire
hazard zone?
e. Other?
,
_ tt.
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Yes
No
Maybe
""
7.
MAN-MADE HA~~m>p:
project:
Will
the
a. Use, store, transport or
dispose of hazardous or toxic
materials (including but not
limited to oil, pesticides,
chemicals or radiation)?
x
b. Involve the release
hazardous substances?
of
x
c. Expose people to the potential
health/safety hazards?
x
d. Other?
B. HOUSING: Will the proposal:
a. Remove existing housing or
create a demand for additional
housin9?
x
b. Other?
9. TRANSPORTATION/CIRCULATION: Could
the proposal result in:
a. An increase in traffic that is
greater than the land use
designated on the General
Plan?
x
b.
Use of existing,
new, parking
structures?
or demand for
facilities/
x
c.Impact upon existing public
transportctionsystems?
x
d. Alteration of present patterns
of circulation?
x
e. Impact to rail or air traffic?
x
f. Increased safety hazards to
vehicles, bicyclists or
pedestrians?
x
REVISED 10/87
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PAGE 4 OF 8
\...
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Maybe
'"
,
A disjointed pattern
roadway improvements?
h. Other?
of
g.
10. ~UBLIC SERVICES will the proposal
impact the following beyond the
capability to provide adequate
levels of service?
a.
Fire protection?
b.
Police protection?
c.
Schools (i.e. attendance,
boundaries, overload, etc.)?
d.
Parks or other recreational
facilities?
e.
Medical aid?
f.
Solid waste?
g. Other?
11. UTILITIES: Will the proposal:
a. Impact the following beyond
the capability to provide
adequate levels of service or
require the construction of
new facilities?
1. Natural gas?
2. Electricity?
3. Water?
4. Sewer?
5. Other?
b.
Resul t in.a
pattern of
extensions?
disjointed
utility
c.
Require the construction of
new facilities?
IIio...
REVISED 10/87
Yes
No
x
x
y
x
x
x
x
x
x
X
X
x
X
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PAGE 5 OF 8
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Maybe
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12. AESTHET]CS:
a. Could the proposal result in
the obstruction of any scenic
view?
b. Will the visual impact of the
project be detrimental to the
surrounding area?
c. Other?
13.
~9y~U~y--FESQURCES:
proposal result in:
Could the
a. The alteration or destruction
of a prehistoric or historic
archaeological site?
b.
Adverse
impacts
historic
object?
physical or aesthetic
to a prehistoric or
site, structure or
c. Other?
14. Mandatory Findings of Significance
(Section 15065)
\..
The California Environmental
Quality Act states that if any of
the following can be answered yes
or maybe, the project may have a
significant effect on the
environment and an Environmental
Impact Report shall be prepared.
a. Does the project have the
potential to degrade the
quality of the environment,
substantially reduce the
habitat of a fish or wildlife
species, cause a fish or
wildlife population to drop
below self sustaining levels,
threaten to eliminate a plant
or animal community, reduce
the number or restrict the
range of a rare or endangered
plant or animal or eliminate
REVISED 10/87
Yes
No
x
x
x
x
~
PAGE 6 OF ,8
~ u
o 0
Yes
No
Maybe
important examples of the
major periods of California
history or prehistory?
b. Does the project have the
potential to achieve short
term, to the disadvantage of
long-term, environmental
goals? (A short-term impact
on the environment is one
which occurs in a relatively
brief, definitive period of
time while long-term impacts
will endure well into the
future.)
x
x
c. Does the project have impacts
which are individually
limited, but cumulatively
considerable? (A project may
impact on two or more separate
resources where the impact on
each resource is relatively
small, but where the effect of
the total of those impacts on
the environment is
significant.)
x
d. Does the project have
environmental effects which
will cause substantial adverse
effects on human beings,
either directly or indirectly?
x
C. DISCUSSION OF ENVIRONMENTAL EVALUATION AND MITIGATION MEASURES
(Attach sheets as necessary.)
Spp RttR~hpn Hheet.
REVISED 10/87
PAGE 7 OF 8
M
,.
o
o
ENVIRONMENTAL EV ALUA nON AND MITIGATION MEASlEIES
Ig. Development Within an Area Sub;ect to Liquefaction
The purpose of this ordinance is to regulate develop-
ment within areas identified in the General Plan as
subject to high (H) or moderately high to moderate (MHM)
probability of Liquefaction in the event of a major earth-
quake.
Development will be allowed in the Liquefaction zone sub-
ject to satisfactory completion of a study by a competent
Soils Engineer stating that from a soils engineering stand-
point the site is adequate for the proposed use and that
potential effects of liquefaction can be mitigated to a
level of non-significance using design and construction
techniques normally available to Structual Designers and
Contractors. Certain exceptions to the requirement of a
study is proposed to be allowed. These exceptions are
consistant with those normally allowed by the Uniform
Building Code for seismic design. See explanation for
7c.
7c. Expose people to the potential Health/Safety Hazards
Those projects which are exempt from the requirement to
provide a study and mitigate liquefaction potential may
be subject to foundation failure in the event of a major
earthquake. In general those projects exempted are of
types of construction which have performed well in
past eqrthquakes and have not been subject to catastrophic
collapse due to liquefaction. Additionally, the maximum
occupancy load of any building exempted is 300 regardless of
building type. This limit is consistent with Uniform Bui1d- ,
ing code Table 23-K which assigns an importance factor of
1.0 to all non-essential buildings of occupancy per Table
33-A less than 300 used for assembly. The importance fac-
tor increases to 1.25 when occupancy load exceeds 300 and
1.50 for essential facilities.
Further, the proposed ordinance will require the study
for assembly buildings with occupancy of more than 50
persons in one room. This is considerably more restric-
tive than the UBC seismic design criteria.
--------*_.-_._---- - . ------.----..---- -_.-.
-
o
o
r
""
D. DETERMINA!JON
On the basis of this initial study,
GJ
The proposed project COULD NOT have a significant effect on the
environment and a NEGATIVE DECLARATION will be prepared.
The proposed project could have a significant effect on the
environment, although there will not be a significant effect in
this case because the mitigation measures described above have
been added to the project. A NEGATIVE DECLARATION will be
prepared.
o
D
The proposed project MAY have a significant effect on the
environment, and an ENVIRONMENTAL IMPACT REPORT is required.
ENVIRONMENTAL REVIEW COMMITTEE
CITY OF SAN BERNARDINO, CALIFORNIA
.:J:;# t: r11J1t/7'V()ff#.e~ ~.v~/~t:.. 4",v1(/~
Name and Title
~at~
Date: 0'- 8 -5'1
~ j
REVISED 12/87 PAGE 8 OF 8