HomeMy WebLinkAboutAGENDA REPORT 1996 1218 CC REG ITEM 07CAGENDA REPORT
CITY OF MOORPARK
TO: The Honorable City Council
FROM: Nelson Miller, Director of Community Development
DATE: December 11, 1996 (For the City Council Meeting of December 18, 1996)
SUBJECT: State Mining and Geology Board Draft Guidelines for Evaluating and
Mitigating Seismic Hazards and Preliminary Seismic Hazards Maps Relating
to Liquefaction and Earthquake- Induced Landslides
Attached is a letter and bulletin from the State Division of Mines and Geology which briefly
describes the draft guidelines and maps relating to the seismic hazard review and mapping. A
reduced copy of the Simi Valley West Quadrangle map, which affects Moorpark, is also attached.
This is one of only six maps which have been currently released. It covers Moorpark, approximately
east of Spring Road. Maps covering the rest of the City have not yet been prepared. The draft
guidelines and maps were prepared by the state in accordance with legislation which was adopted
subsequent to the Northridge earthquake, in order to reduce and mitigate earthquake hazards. They
have been released for a ninety day comment period, which ends January 7, 1997.
DISCUSSION
We have discussed the guidelines and map with representatives of Bing Yen & Associates, Inc., the
City's geotechnical consultant. They have indicated that the City is already reviewing projects in
a manner largely consistent with the proposed guidelines. They also did not have major concerns
regarding the preliminary map. They do have a few technical concerns regarding the guidelines
which they are preparing for the City of Malibu, for whom they also consult.
The State intends to adopt the guidelines and map in the Spring. Following adoption these
guidelines would be required. The guidelines and maps would also be required to be considered in
any updates of the General Plan Land Use or Safety Elements and any changes in ordinances.
The areas mapped would also be considered mapped hazard zones which would be used by the
insurance companies in determining risk and rates and would be required to be disclosed as part of
any real estate transaction.
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Receive and file this report.
Attachments: Letter and Bulletin #1
Seismic Hazard Zone Map
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C. \OFFICE \W P WIN\ WPDOCS \CCRPTS \SEISMCHZ- WPD
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STATE OF CALIFORNIA - THE RESOURCES AGENCY PETE WILSON Govemor
DEPARTMENT OF CONSERVATION
DIVISION OF MINES AND GEOLOGY
HEADQUARTERS
801 K Street, MS 12 -30
Sacramento, CA 95814 -3530
Phone: 1. (916) 324 -1825
FAX: (916) 445 -5718
To: City Managers
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The purpose of the Seismic Hazard Mapping Act is to reduce and mitigate earthquake
hazards in order to protect public health and safety. Responsible agencies affected by the
regulatory zones must regulate specified "projects" within the zones in order to identify and
mitigate seismic hazards.
I am pleased to announce the release of six (6) Preliminary Review Maps of Proposed
Seismic Hazard Zones for public comment. These maps, addressing the hazards of
liquefaction and earthquake - induced landslides, were developed pursuant to the Seismic
Hazard Mapping Act (Division 2, Chapter 7.8, California Public Resources Code (PRC)).
These maps are issued in addition to, and do not replace, any existing Alquist- Priolo
Earthquake Fault Zone maps that may cover the same area.
The enclosed index map identifies the maps released. A color copy of each Preliminary
Seismic Hazard Zone Map affecting your jurisdiction is enclosed for your immediate review.
You will recall that our staff recently met with you and/or your staff to show you each map and
to discuss the requirements of the Act. Please check the zone and map boundaries to
determine whether you have received the correct map(s).
The Seismic Hazards Mapping Act (SHM Act) requires the State Geologist to compile and
issue maps identifying seismic hazard zones, and to submit the maps to all affected cities,
counties, and state agencies for review and comment. Concerned jurisdictions and agencies
must submit all comments to the State Mining and Geology Board (SMGB) for review and
consideration within 90 days. (See enclosed SMGB information.)
Within 90 days of the closure of the comment period, the revised maps will be issued as
Official Maps of Seismic Hazard Zones. Cities and counties affected by the official zones
must require a geotechnical (hazards) investigation report for each subdivision and most
structures that qualify as projects under the Act. They must submit copies of these reports to
the State Geologist after they have been approved (PRC Section 2697) by the local
government. California Code of Regulations (CCR) Section 3724 outlines specific criteria for
project approval. Additional guidance regarding the responsibilities of cities, counties, and
state agencies, and guidelines for evaluating and mitigating seismic hazards have been
developed by the State Mining and Geology Board as required by PRC Section 2695. Those
draft guidelines are also enclosed for your review and comment.
These maps were prepared using techniques recommended by the Seismic Hazard
Mapping Act Advisory Committee and the State Mining and Geology Board. To define
liquefaction hazard zones, basic geologic and detailed subsurface information was used in
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City Managers
October 4, 1996
_Page
combination with historic high water table data and the estimation of the maximum earthquake
ground shaking likely to occur at alllocations shown on the maps in the next 50 years. The
earthquake- induced landslide hazard zones were delineated using a modified Newmark
analysis that incorporated geologic and rock - strength data and estimates of ground shaking
associated with future earthquakes.
The extent of the liquefaction and landsliding hazards in each zone is not uniform. The
purpose of establishing these zones is to include areas within which soil conditions,
topography, and the likelihood of future ground shaking indicate sufficient hazard potential to
justify a geotechnical (hazards) investigation of the individual characteristics of specific project
sites before land -use permits are granted. This process enables local government to stipulate
appropriate conditional requirements for the design and/or construction that can mitigate future
earthquake losses. In developed regions, the zone maps delineating areas where geologic
studies are required should not be used to infer that all existing construction within the zone
boundaries is hazardous. The properties of local soil conditions and the characteristics of
individual buildings are too variable for such regional conclusions about overall vulnerability to
be justified or appropriate.
Please also note that within five days of receipt of the Official Maps, counties are
required to post a notice at specified locations (county recorder, county assessor, and county
planning commission) announcing their availability (PRC Section 2696(c)).
The California Department of Conservation has established a World Wide Web site
(http: /lwww.consrv.ca.govn to aid in disseminating information about this and other programs.
On the Seismic Hazard Mapping Program Home Page ( http: //www.consrv.ca.gov /dmg /shezp /)
you will find links to articles that describe the program and the hazards being addressed,
copies of draft guidelines (once they are released), and ways to obtain copies of the maps
and other products. If you need additional information, please contact Ted Smith, Local
Government Outreach Coordinator for Seismic Hazard Mapping, at (916) 323 -8569 (e -mail:
tsmith @consrv.ca.gov) or Bea McKamey at (916) 324 -1407 (e -mail:
bmckamey @consrv.ca.gov).
Sincerely,
James 'r Davis
State Geologist
Enclosures
Draft Guidelines
Availability of Seismic Hazard Zone Maps
Seismic Hazard Mapping Maps
Seismic Hazard Mapping Bulletin
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seis0 mic ffazalw Mapping
Bulletin #I Department of Conservation
Division of Mines and Geology
801 K Street, MS 12-31
Sacramento, CA 95814
Seismic Hazard Zone Maps Released
fState Department of
onservation's Division of
ines and Geology has
leased six preliminary
ismic Hazard Zone Maps,
the first in a series. Five of the maps
were prepared with funding from the
Federal Emergency Management
Agency and the Governor's Office of
Emergency Services. Thirty-three
more maps will be completed for
portions of Ventura, Los Angeles and
Orange counties over the next two
years.
On October 8, 1996, the six prelim-
inary maps were distributed to all
California cities and counties and to
affected state and federal agencies,
beginning a 90 -day review and
comment period. At the same time the
State Mining and Geology Board
released draft implementation guide-
lines for a 90 -day review.
The Legislature passed the Seismic
Hazard Mapping Act in 1990 (AB
3897; Public Resources Code, Chapter
7.8, Sections 2690 - 2699.6), directing
the Division of Mines and Geology to
prepare the maps. The purpose of the
Act is to reduce threat to public health
and safety and to minimise economic
loss due to seismic hazards.
The Act directs cities, counties and
state agencies to use the maps in their
land use planning and permitting
processes. A site - specific geotechni-
cal report is required prior to permit-
ting most urban developments within
the zones. The Act also requires
sellers of real property (or their
agents) within the zones to disclose
this fact to potential buyers.
The guidelines will aid local
agencies in establishing land use
management policies and ordinances
to reduce and mitigate losses from
IAP
ground failure during earthquakes.
The maps and guidelines may also be
useful to insurance companies, con-
sultants, investors and the public. A
twelve - member advisory committee
Condnaed on page 4
/3 114 116
Preliminary 10+°$196 (St2 San Francisco North g
Official Maps 3!1197 western Oakland West not shown)
Preliminary 411197
Official Maps 1011197
aAno
1 San Francisco
8 Calabasas
North and Treas-
9 Canoga Park
ure Island portion
10 Van Nuys
of Oakland West
11 Burbank
12 Newhall
12 Pena
3 Mint Canyon
13 Mount Wilson
4 Simi Valley West
14 Azusa
5 Simi Valley East
15 Glendora
6 Oat Mountain
16 Topanga
7 San Fernando
17 Beverly Hills
29 Redondo Beach
18 Hollywood
Preliminary 111198
Official Maps 711198
19 Los Angeles
30 Torrance
20 El Monte
31 Long Beach
21 Baldwin Park
32 Los Alamitos
22 San Dimas
33 Anaheim - "
23 Venice
34 Newport Beach
24 Inglewood
35 San Pedro
25 Southgate
38 Seal Beach
26 Whittier
37 Newport Beach
27 La Habra
38 Tustin
28 Yorba Linda
39 Laguna Beach
29 Redondo Beach
Seismic Hazard Zone Maps Represent
State -of -the -Art Technology
he California Department of
Conservation's Division of
Mines and Geology, is
working with state -of -the -art
technology, identifying and
mapping the state's most
prominent earthquake hazards. The
Department's geologists will ultimately
chart areas prone to liquefaction (failure
of water - saturated soil) and earthquake -
induced landslides throughout the state's
principal urban and major growth areas
(see figure opposite).
The official maps produced by the
Seismic Hazard Mapping Program are
mandated by the Seismic Hazard Map-
ping Act of 1990 to be used by cities and
counties to regulate development within
identified seismic hazards. Local
governments, at their discretion, can
withhold development permits until
geologic or soils investigations are
conducted and mitigation measures are
incorporated into project plans.
UNIQUE ASPECTS
Previously, seismic hazard maps may
have been done by local governments or
other parties in selected areas or for
special purposes. The official Seismic
Hazard Zone Maps are different in three
key aspects:
♦ First, the Division scientists inte-
grate the very latest geotechnical
data available with state -of -the -art
computer technology to produce the
maps. The information is the most
up-to -date possible at the time of
production.
♦ The Department uses a standardized
method of hazard assessment to
evaluate hazard potential consis-
tently for the entire state. Other
mappers have applied their own
criteria for assessing hazards in the
smaller study areas. Viewed
together, these maps would show a
patchwork -quilt view of the region
as a whole. It is this standardized
look at the hazards that make these
official maps particularly valuable.
♦ These are the first seismic hazard
maps to use a scale (1:24,000) large
enough to provide a detailed look at
a large region. Based on existing
U.S. Geological Survey topo-
graphic quadrangle maps, each map
covers an area approximately 60
square miles in size. Most cur-
rently available maps are at a much
smaller scale of 1:100,000.
PRODUCTION PROCESS
The maps are the result of detailed
data analyses by the Division's geolo-
gists and seismologists. The experts
examine the latest information about
surface and subsurface geology,
historic groundwater levels and damage
and geologic effects resulting from the
Northridge and other earthquakes
throughout California. With a state -of-
the -art seismic hazard mapping system,
the data are integrated into a three -
dimensional view of the ground.
Capabilities of the seismic hazard
mapping system include, but extend
beyond those of a conventional geo-
graphic information system. in
addition to having the capability to
store and manipulate large volumes of
spatial data, the system permits
subsurface geological analysis, photo-
grammetry and remote sensing analysis,
including stereoscopic display of aerial
images of the land for interactive
analysis of the surface geology and
topography of the landscape.
Division geoscientists in Sacra-
mento, Los Angeles, and San Francisc
are linked by a high -speed wide -area
network with all the essential analysis
tools for seismic hazard zone delinea-
tion at the desktop. Time required for
complex tasks, such as mapping of
existing land - slides over large areas,
have been reduced from months to
weeks using this system.
Seismic hazard zone map informa-
tion will be made available in several
formats, including the Spatial Data
Transfer Standard (FIPS 173), for use
on a local geographic information
system.
FUNDING
The Seismic Hazard Mapping
Program was originally funded by the
California Residential Earthquake
Recovery Fund and a portion of local
building permit fees. In the early 90s,
however, funding for the program was
greatly reduced when the recession
slowed construction and the Earth-
quake Recovery Fund was cancelled.
The Department of Conservation
was able to continue the program with
federal disaster relief funds from the
Federal Emergency Management
Agency, through the Governor's Offic
of Emergency Services. As much as
$15 million has been earmarked for
seismic hazard mapping in Southern
California counties affected by the
1994 Northridge earthquake.
4141. .04. ee
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Seismic Hazard Mapping
Geographic Priorities
W
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Maps to be released over the next two years are shown in black. The current release includes San Francisco North and the -' —
Treasure Island portion of Oakland West, Topanga, Simi Valley East, Simi Valley West, Anaheim, and Newport Beach quadrangles.
Maps scheduled for release in 1997 and 1998 are shown on front cover. Remaining areas shown identrfy possible future work,
depending on availability of funding.
()WW U
CoMbured from page l
assisted the Board in developing
the draft guidelines.
The maps identify areas where
soil liquefaction and earthquake -
induced landslides are most likely to
occur. The Liquefaction Hazard
Zones are areas underlain by satur-
ated sands and silts deposited during
the last 10,000 years. The Landslide
Hazard Zones are areas, generally
steep hillslopes composed of weak
materials, where earthquakes are
likely to trigger landslides, rockfalls,
and other slope failures..
The proposed hazard zones were
delineated by highly - skilled staff
using state -of- the -art computer
technology to compile geologic data
from local government agency files
and other appropriate sources. The
data include basic geologic mapping
by state and federal geologists,
historic records, and topographic
data. Interpretation of the data leads
to identification of areas known to
have experienced landslides or
liquefaction during historic (last
250 years) earthquakes, or where
conditions indicate that these
hazards are likely to occur in the
future.
Following the review period,
the maps and guidelines will be
revised in response to comments
received. The State Mining and
Geology Board plans to adopt the
guidelines no later than March 1
unless revisions are extensive.
About the same time, the State
Geologist will issue official
versions of the first six maps.
The deadline for submitting
comments on both the maps and
guidelines is January 7, 1997.
Copies of the maps are available as
blue -line prints for the cost of
reproduction from:
BPS Reprographic Services
149 Second Street
San Francisco, CA 94103
(415) 495 -8700 ext. 550
,lint Clock IPAO%
Frequently Asked Questions abort ear*quake hazards
and the Seismic Hazard Mapping Act
Q. What hazards do the maps show?
A. The maps show areas that have potential for landslide
and liquefaction hazards.
Q. What is liquefaction?
A. During an earthquake saturated sandy and silty soils may
"liquefy. " The soils 'fail" to support buildings, which can
sustain severe damage unless the hazard is recognized
and mitigated
Q. How are these maps different from the maps released
last February?
A. Although these maps partly cover the same areas as the
"reconnaissance " maps released in early February, they
are based on additional data thus they are much more
detailed and accurate than the earlier maps.
Q. What are the responsibilities of the cities and counties?
Are they required to enact an ordinance?
A. The Act leaves the implementation procedures to the
discretion of local governments. The State Mining
or
Universal Reprographics, Inc.
2076 Wilshire Blvd.
Los Angeles, CA 90057
(213) 365 -7750
Reduced -size versions of the maps
and copies of the draft guidelines are
available through the Department of
Conservation's home page at:
http://www.consrv.ca.gov/.
To purchase copies of the draft
guidelines or for assistance with
map and guideline interpretation,
contact the Department of
Conservation at one of these
locations: Los Angeles (213) 620-
3560; Sacramento (916) 445 -5716;
San Francisco (415) 9047707; or
email: tsmith @consrv.ca.gov.
Please send comments on the
maps and/or guidelines to:
State Mining and Geology Board
801 K Street, MS 24 -05
Sacramento, CA 95814
10464.
and Geology Board has drafted guidelines to assist in
local implementation Some cities may want to enact an
ordinance; others may rely on CEQA and the planning
process, or their own permit review procedures.
Q. Does the Seismic Hazard Act apply to all development?
A. No. The Act is directed at mitigating hazards to new
structures for human occupancy, though some smaller
developments may be exempt. Cities and counties may
have more restrictive requirements.
Q. How can I find out about earthquake hazards on my
property?
A. Copies of the maps can be purchased from BPS Repro -
graphic Services and Universal Graphics. The addresses
are provided above. Many cities and counties may make
copies available for viewing in their offices.
Q. When the next earthquake occurs will the entire area_
shown on the maps be devastated?
A. The maps show areas that are prone to landslides and
liquefaction This does not mean that the area will be
uniformly affected during an earthquake, nor that s
outside the zone will be unaffected (�,(�(t 'I
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