HomeMy WebLinkAboutMC-676
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ORDINANCE NO. MC-676
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:
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SECTION 1.
Chapter 15.08 is added to the San Bernardino
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Municipal Code as follows:
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"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
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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 of 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.
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1 15.08.030 Scope-Map.
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A Map is included in the General Plan indicating areas of
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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
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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.
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Liquefaction is defined as the 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.
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21 15.08.050 Reports Required.
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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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high liquefaction susceptibility areas as indicated on the
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Map:
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1.
Essential facilities, as defined in Section
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2312(K) of the Uniform Building Code, including but
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not limited to hospitals and other emergency medical
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facilities, fire and police stations, and government
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disaster operation and communication centers.
2.
Buildings where the primary occupancy is for
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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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Towers with a height more than 35 feet.
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B.
A liquefaction report plus mitigation measures
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prepared by a Registered Civil Engineer may be required by
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the Director of Public Works/City Engineer for new
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construction or structural modification of more than
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twenty-five percent (25%) of the building area for the
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buildings or structures listed below, which fall within the
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moderately high to moderate liquefaction susceptibility
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areas as indicated on the Map:
1.
Essential facilities, as defined in Section
23l2(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
l5.08.050A, 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
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21 from providing a liquefaction report:
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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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addition increases the occupancy to a level requiring
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a report under Section 15.08.050.
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4.
One or two story wood frame structures,
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whose occupancy is not listed in Section 15.08.050.
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A non-essential structure, where the
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developer has assumed the site will liquefy and has
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designed for liquefaction.
Plans must be signed by a
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Registered Civil Engineer and contain a statement to
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the effect that the building has been designed to
withstand liquefaction.
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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.
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The Director of Public Works/City Engineer shall
18 promulgate written procedures, regulations, guidelines and fees
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
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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
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regular
meeting thereof, held on the 18th
Bernardino at a
10 day of September , 1989, by the following vote, to wit:
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Council Members Estrada, Reilly, Flores, Maudsley
AYES:
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Minor, Pope-Ludlam, Miller
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None
NAYS:
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None
ABSENT:
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~;:-&~Ai>/
Clty Clerk
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ordinance is hereby approved this //;/-1
day
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The foregoing
~J??/Zd/U
, 1989.
of
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~~ )j;Lo~
'Mayor Pro Tempore,
City of San Bernardino
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22 Approved as to form
and legal content:
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JAMES F. PENMAN,
City Attorney
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