HomeMy WebLinkAbout1991-09-24; City Council; 11363; AGREEMENT FOR THE PREPARATION OF GEOTECHNICAL STUDIES AND ANALYSIS FOR THE UPDATE OF THE SAFETY ELEMENT OF THE GENERAL PLAN4
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CIT~F CARLSBAD - AGEND~ILL Y?
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DEPT. PLN CITY
RECOMMENDED ACTION:
AB # j]; 3 I;i 3 TITLE. AGREEMENT FOR THE PREPARATION OF GEO-
mNICAL, STUDIES AND ANALYSIS FOR THE UPDATE
OF THE SAFETY ELEMENT OF THE GENERAL PLAN
If Council concurs ADOPT Resolution No. 9/ J 3 19 , authorizing the Mayor to ente
an agreement with the consulting firm of Leighton and Associates to prepare geotecl
studies and analysis for the update of the Safety Element of the General Plan.
ITEM EXPLANATION
On April 2, 1991, the City Council approved the work plan for the comprehensive u
of the General Plan. As outlined in the work plan for the General Plan update, SI
technical studies are necessary in order to update the "technical base'' of the General
including geotechnical studies for the update of the Safety Element,
The update of geotechnical studies for the Safety Element will be a technically comple
requiring the specialized expertise of a geotechnical consultant. The consultant will
staff in a range of areas which include the following: maps of geotechnical hazard
local faults; inventories of mineral resources and soil conditions; matrices of lan
compatibility; and maps of slopes and coastal erosion. The update will also ir
developing land use policies and implementation programs to respond to geotec
issues.
Requests for proposals were sent to approximately eighteen firms and seven response:
received. After thorough review and analysis of all proposals submitted, five firms
selected to interview by a selection committee, consisting of staff from the Plannin
Engineering Departments. Proposals from these five firms included cost estimates ri
from $70,540.00 to $126,635.00.
proposals, and the proposed scope of work, the selection committee unanin
recommends that the firm of Leighton and Associates be selected to prepar
geotechnical studies and analysis for the Safety Element update. Leighton and Assc
bid of $93,431 .OO was neither the highest nor the lowest received. However, their prc
local geo-hazards, and the strongest experience in preparing geotechnical ordinancc
review manuals. In addition to the funds for consulting services, an additional sum,
amount of $5,000.00 is being allocated to cover the cost of reproducing the maps, rc
and other documents prepared by the consultant as draft and final products. The esti
reproduction costs will cover duplicating all necessary documents to be presented
public for review and comment as part of the General Plan update process. The c
reproducing documents was not made a direct part of this consulting contract as th
can realize a substantial reduction in reproduction costs by reproducing documents in.
or having documents printed by a vendor-of-choice.
Based on the interviews and further review
contained the most comprehensive scope of work, ehbited a strong field knowlec
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PAGE 2 OF AGENDA BILL NO. 11, Jh 3
FISCAL IMPACT
$215,000 is presently available in the Planning Department's FY 91-92 budget fc
General Plan Update. A balar
$54,307.00 will remain after this study is funded.
Staff has estimated, however, that the cost of the entire General Plan Update proce:
be approximately $528,693. (This does not include staff time which will be substa
The estimated costs are broken-down as follows:
Therefore, funding for this study is available.
Miscellaneous
Based on the above actual and estimated costs to complete the entire General Plan I.
it will be necessary for the City Council to appropriate an additional $314,000.00 tc
all phases of this process. Staff will provide Council with a fiscal status report a!
Sufficient funds are available in the Planning Department professional services bud
support the geo-technical study.
EXHIBITS
1.
2.
contract is presented for approval. At this time no additional appropriation is req
City Council Resolution No. 9 / - ? / 7
Agreement with Leighton and Associates
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RESOLUTION NO.. 91-319
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF CARLSBAD, CALIFORNIA, APPROVING AN AGREEMENT BETWEEN THE CITY OF CARLSBAD AND LEIGHTON AND ASSOCIATES, FOR CONSULTING SERVICES TO PREPARE GEOTECHNICAL STUDIES AND ANALYSIS FOR THE UPDATE OF THE SAFETY ELEMENT OF THE
CARLSBAD GENERAL PLAN.
The City Council of the City of Carlsbad, Califor
does hereby resolve as follows:
1. That an agreement between the City of Carlsbad
Leighton and Associates, for consulting services to pre
geotechnical studies and analysis for the update of the Sa
Element of the Carlsbad General Plan, is hereby approved.
2. The Mayor of the City of Carlsbad is he
authorized and' directed to execute said agreement for an
behalf of the City of Carlsbad.
PASSED, APPROVED AND ADOPTED at a regular meetin
the City Council of the City of Carlsbad, California, on thi
24th day of September , 1991.
AYES: Council Members Kulchin, Stanton and Nygaard
NOES: None
ABSENT: Council Members Lewis and Larso
ATTEST : ANN J. KULCHIN, Mayor Pro-Tern
A&. tuTgiiiirji1erk
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AGREEMENT
THIS AGREEMENT, made and entered into as of the 2'd * day of
mJ , 1991, by and between the CITY OF CARLSBAD, a municipal
corporation, hereinafter resferred to as "CITY', and LEIGHTON AND ASSOCIATES,
INC., hereinafter referred to as "CONSULTANT".
RECITALS
CITY requires the services of a Geotechnical and Environmental Engineering
consultant to assist staff .in revisions to the geotechnical portion of the Safety
Element of the General Plan; and CONSULTANT possesses the necessary skills and
qualifications to provide the services required by the CITY;
NOW, THEREFORE, in consideration of these recitals and the mutual
covenants contained herein, CITY and CONSULTANT agree as follows:
1. CONSULTANT'S OBLIGATIONS
The Consultant shall assist CITY staff in revisions to the geotechnical portions
of the Zoning Ordinance and the Safety Element. Specific tasks shall include all
items as outlined in Attachment A, attached and made a part hereof.
2. CITY OBLIGATIONS
The CITY shall make payment to the consultant as provided in paragraph 6,
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.- “Payment of Feestt of the Agreement.
The CITY shall make available to the consultant all currently held plans,
maps and background information.
The CITY shall coordinate all meetings, including CITY hearings and
associated noticing.
The CITY shall provide the consultant with any goals, policies, standards,
recommendations, or any other pertinent information deemed necessary for
inclusion in the geotechnical portions of the Zoning Ordinance and the Safety
Element.
3. PROGRESS AND COMPLETION
The work under this contract will begin within five (5) days after receipt of
notification to proceed by the CITY and be completed as agreed upon by both
parties following the establishment of a schedule for completion of all tasks as
outlined in Attachment A. The Planning Director will provide CONSULTANT with
a Notice of Completion following the satisfactory completion of all tasks.
Extensions of time may be granted if requested by the CONSULTANT and agreed
to in writing by the Planning Director. The Planning Director will give allowance
for documented and substantiated unforeseeable and unavoidable delays not caused
by a lack of foresight on the part of the CONSULTANT, or delays caused by CITY
inaction or other agencies’ lack of timely action.
4. FEES TO BE PAID TO CONSULTANT
The total shall not exceed the fee payable according to Paragraph 6,
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. NO other compensation for
services will be allowed except those item covered by supplemental agreements per
Paragraph 8, "Changes in Work."
5. DURATION OF CONTRACT
"Payment of Fees," and shall be $ 43, c131 00
This agreement shall extend for a period of six (6) months from date thereof.
The contract may be extended for one (1) additional one (1) year periods or parts
thereof, based upon satisfactory performance and the CIWs needs.
6. PAYMENT OF FEES
Payment of fees shall be made within thirty (30) days after receipt and
approval of a monthly invoice submitted by CONSULTANT to CITY. The
CONSULTANT shall be paid for up to ninety percent of the compensable services for
completion of the work as set forth in Paragraph 1, "Consultant Obligations". The
final ten percent shall be paid, not to exceed the maximum amount provided for in
Paragraph 4, "Fees to be Paid to Consultant", to CONSULTANT within thirty (30)
days of the Planning Director issuing the Notice of Completion of the contract as
outlined h Paragraph 3, "Progress and Completion".
Monthly invoice shall bill CITY for each task completed and for the
percentage of each task partially completed in the preceding month. All invoices
shall be detailed and include a written description of the tasks completed and tasks
partially completed, and the total amount of requested payment as set forth in the
schedule of fees (Attachment B).
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7. FINAL SUBMISSIONS
Within fifteen (15) days of completion and approval of the recommended
changes to the Zoning Ordinance and the Safety Element the CONSULTANT shall
deliver to the CITY all items as outlined in paragraph 1, "Consultant Obligation".
8. CHANGESINWORK
If, in the course of the contract, changes seem merited by the CONSULTANT
or the CITY, and informal consultations with the other party indicate that a change
in the conditions of the contract is warranted, the CONSULTANT or the CITY may
request a change in contract. Such changes shall be processed by the CITY in the
following manner: A letter outlining the required changes shall be forwarded to the
CITY by CONSULTANT to inform them of the proposed changes along with a
statement of estimated changes in charges or time schedule. A supplemental
agreement shall be prepared by the CITY and approved by the CITY according to the
procedures described in Carlsbad Municipal Code Section 3.28.1 72. Such
supplemental agreement shall not render ineffective or invalidate unaffected
portions of the agreement.
9. COVENANTS AGAINST CONTINGENT FEES
The CONSULTANT warrants that their firm has not employed or retained any
company or person, other a bona fide employee working for the CONSULTANT, to
solicit or secure this agreement, and that CONSULTANT has not paid or agreed to
pay any company or person, other than a bona fide employee, any fee, commission,
percentage, brokerage fee, gift, or any other consideration contingent upon, or
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Le resulting from, the award or making of this agreement. For breach or violation of
this warranty, the CITY shall have the right to annul this agreement without
liability, or, in its discretion, to deduct from the agreement price or consideration,
or otherwise recover, the full amount of such fee, commission, percentage,
brokerage fees, gdt, or contingent fee.
10. NONDISCRIMINATION CLAUSE
The CONSULTANT shall comply with the state and federal laws regarding
nondiscrimination.
11. TERMINATION OF CONTMCX
In the event of the CONSULTANTS failure to prosecute, deliver, or perform
the work as provided for in this contract, the CITY may terminate this contract for
nonperformance by notifying the CONSULTANT by certified mail of the termination
of the CONSULTANT. The CONSULTANT, thereupon, has five (5) working days to
deliver said documents owned by the CITY and all work in progress to the Planning
Director. The Planning Director shall make a determination of fact based upon the
documents delivered to CITY of the percentage of work which the CONSULTANT
has performed which is usable and of worth to the CITY in having the contract
completed. Based upon that finding as reported to the City Manager, the Manager
shall determine the final payment of the contract.
12. DISPUTES
If a dispute should arise regarding the performance of work under this
agreement, the following procedure shall be used to resolve any question of fact or
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interpretation not otherwise settled by agreement between parties. Such questions,
if they become identified as a part of a dispute among persons operating under the
provisions of this contract, shall be reduced to writing by the principal of the
CONSULTANT or the Planning Director. A copy of such documented dispute shall
be forwarded to both parties involved along with recommended methods of
resolution which would be of benefit to both parties. The Planning Director or
principal receiving the letter shall reply to the letter along with a recommended
method of resolution within ten (10) days. If the resolution thus obtained is
unsatisfactory to the aggrieved party, a letter outlining the dispute shall be
forwarded to the City Council for their resolution through the Office of the City
Manager. The City Council may then opt to consider the directed solution to the
problem. In such cases, the action of the City Council shall be binding upon the
parties involved, although nothing in this procedure shall prohibit the parties
seeking remedies available to them at law.
13. SUSPENSION OR TERMINATION OF SERVICES
This agreement may be terminated by either party upon tendering thirty (30)
days written notice to the other party. In the event of such suspension or
termination, upon request of the CITY, the CONSULTANT shall assemble the work
product and put same in order for proper filing and closing and deliver said product
to CITY. In the event of termination, the CONSULTANT shall be paid for work
performed to the termination date; however, the total shall not exceed the lump
sum fee payable under paragraph 4. The CITY shall make the final determination
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as to the portions of tasks completed and the compensation to be made.
14- STATUS OF WE CONSULTANT
The CONSULTANT shall perform the services provided for herein in
CONSULTANTS own way as an independent contractor and in pursuit of
CONSULTANTS independent calling, and not as an employee of the CITY.
CONSULTANT shall be under control of the CITY only as to the result to be
accomplished, but shall consult with the CITY as provided for in the request for
proposal.
The CONSULTANT is an independent contractor of the CITY. The payment
made to the CONSULTANT pursuant to the contract shall be the full and complete
compensation to which the CONSULTANT is entitled. The CITY shall not make any
federal or state tax withholdings on behalf of the CONSULTANT. The CITY shall not
be required to pay any workers' compensation insurance on behalf of the
CONSULTANT. The CONSULTANT agrees to indemnify the CITY for any tax,
retirement contribution, social security, overtime payment, or workers' compensation
payment which the CITY may be required to make on behalf of the CONSULTANT
or any employee of the CONSULTANT for work done under this agreement,
The CONSULTANT shall be aware of the requirements of the Immigration
Reform and Control Act of 1986 and shall comply with those requirements,
including, but not limited to, verifying the eligibility for employment of all agents,
employees, subcontractors and consultants that are included in this agreement.
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15. CONFORMITY TO LEGAL REOUIREMENTS
The CONSULTANT shall cause all drawings and specifications to conform to
all applicable requirements of law: federal, state and local. CONSULTANT shall
provide all necessary supporting documents, to be filed with any agencies whose
approval is necessary.
The CITY will provide copies of the approved plans to any other agencies.
16. OWNERSHIP OF DOCUMENTS
All plans, studies, sketches, drawings, reports, and specifications as herein
required are the property of the CITY, whether the work for which they are made
be executed or not. In the event this contract is terminated, all documents, plans,
specifications, drawings, reports, and studies shall be delivered forthwith to the
CITY. CONSULTANT shall have the right to make one (1) copy of the plans for
his/her records.
17. REPRODUCTION RIGHTS
The CONSULTANT agrees that all copyrights which arise from creation of the
work pursuant to this contract shall be vested in CITY and hereby agrees to
relinquish all claims to such copyrights in favor of CITY.
18. HOLD HARMLESS AGREEMENT
The CITY, its officers, and employees shall not be liable for any claims,
liabilities, penalties, fines, or any damage to goods, properties, or effects of any
person whatever, nor for personal injuries or death caused by, or resulting from, any
intentional or negligent acts, errors or omissions of CONSULTANT or
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CONSULTANT'S agents, employees, or representatives. CONSULTANT agrees to
defend, indemnify,' and save free and harmless the CITY and its officers and
employees against any of the foregoing claims, liabilities, penalties or fines,
including liabilities or claims by reason of alleged defects in any plans and
specifications, and any cost, expense or attorney's fees which are incurred by the
CITY on account of any of the foregoing.
19. ASSIGNMENT OF CONTRACX
The CONSULTANT shall not assign this contract or any part thereof or any
monies due thereunder without the prior written consent of the CITY.
20. SUBCONTRACTING
If the CONSULTANT shall subcontract any of the work to be performed
under this contract by the CONSULTANT, CONSULTANT shall be fully responsible
to the CITY for the acts and omissions of CONSULTANTS subcontractor and of the
persons either directly or indirectly employed by the subcontractor, as
CONSULTANT is for the acts and omissions of persons directly employed by
consultant. Nothing contained in this contract shall create any contractual
relationship between any subcontractor of CONSULTANT and the CITY. The
CONSULTANT shall bind every subcontractor and every subcontractor of a
subcontractor by the terms of this contract applicable to CONSULTANTS work
unless specifically noted to the contrary in the subcontract in question approved in
writing by the CITY.
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21. PROHIBlTED INTEREST
No official of the CITY who is authorized in such capacity on behalf of the
CITY to negotiate, make, accept, or approve, or take part in negotiating, making,
accepting, or approving of this agreement, shall become directly or indirectly
interested personally in this contract or in any part thereof. No officer or employee
of the CITY who is authorized in such capacity and on behalf of the CITY to exercise
any executive, supervisory, or similar functions in connection with the performance
of this contract shall become directly or indirectly interested personally in this
contract or any part thereof.
22. VERBAL AGREEMENT OR COMIERSATION
No verbal agreement or conversation with any officer, agent, or employee of
the CITY, either before, during or after the execution of this contract, shall affect
or modify any of the terms or obligations herein contained nor entitle the
CONSULTANT to any additional payment whatsoever under the terms of this
contract.
23. SUCCESSORS OR ASSIGNS
Subject to the provisions of Paragraph 18, "Hold Harmless Agreement," all
terms, conditions, and provisions hereof shall insure to and shall bind each of the
parties hereto, and each of their respective heirs, executors, administrators,
successors, and assigns.
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24. EFFECLTVEDAE
This agreement shall be effective on and from the day and year first above
written.
25. CONFLICT OF INTEREST
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The CONSULTANT shall file a Conflict of Interest Statement with the City
Clerk in accordance with the requirements of the City of Carlsbad Conflict of
Interest Code. The CONSULTANT shall report investments or interests in real
property.
26. INSURANCE
The CONSULTANT shall obtain and maintain policies of general liability
insurance, automobile liability insurance, and a combined policy of workeis
compensation and employers liability insurance from an insurance company
authorized to do business in the State of California which meets the requirements
of City Council Resolution No. 90-96 in an insurable amount of not less than one
million dollars ($1,000,000) each, unless a lower amount is approved by the City
Attorney or the City Manager. This insurance shall be in force during the life of this
agreement and shall not be canceled without thirty (30) days prior written notice
to the CITY sent by certified mail.
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The CITY shall be named as an additional insured on these policies. The
CONSULTANT shall furnish certificates of insurance to the CITY before
commencement of work.
Executed by CONSULTANT this /J6day of h c$'k LJ* ,1941.
CONSULTANT: CITY OF CARLSBAD, a municipal
corporation of the State of California Leighton and Associates, Inc.
(name of Consultant) .? ,/7rp
By: Q2&4(/- klzyc -
i ;cTii-<, i iC5LL 3- kg+. m%~iiEN&- City Clerk
(sign here)
ATTEST:
L.' C-x-UCC *>('I L.- __ crv c h_ - (print name here)
(title and organijzadon of signatory)
J .-.
Oranae J )s$
STATE OF CALIFORNIA
COUNTY OF
On this iy* day of &wA--C;t 1991 before me, the undersigned, otary Public in and for st State, personally appeared bvGe x. Clark and 'Zrve3-t Pc30,WlGd personally known to m~(sp-pPsuebto-me-o~ke-basis-of sat-isfactory evidenee) to be the persons who executed thc within instrument as President and &rs;S-k-\nt-Secretary, respectively, of the Corporation therein named, and acknowledged to me that the Corporation executed it pursuant to its by-laws or a resolution of its board of directors.
WITNESS my hand and official seal.
1
i T-3- rs,l4cc3la.-4 Notary Public in and for said State
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LEIGHTON AND ASSOCIATE§, INC.
SCOPE OF WORK
Task 1;
Hazard overlay maps will be prepared at a scale of 1 inch = 1000 feet. Once the map datE
fully integrated into the CITY'S GIS system, select data can be presented at a variety of scal
and formats to simplify the update of the database with new information. This is also the premi
for a seismic hazard overlay concept, a plan where hazards can be mixed and matched
provide individual and combined constraints for a particular site early in the review process. TI
portion of the study will include the research review, reconnaissance mapping and aerial phc
review necessary to compile a hazard map for the geotechnical hazards listed below.
Identification and Mapping of Geotechnical Hazards
Task I .I :
The State Alquist-Priolo Special Study Zone (APSSZ) Act states, "active faults" are thc
faults deemed "sufficiently active and well-defined" to constitute a surface rupture haza
and should show evidence of displacement of the ground surface sometime within t
last 10,000 to 1 1,000 years. Potentially active faults, by State definition, are those fau
that show evidence of activity between 11,000 and 2 million years ago. The State has n
identified any APSSZs in the City of Carlsbad. Further, to date, no research h
indicated any candidate faults in the City for the State program.
Leighton and Associates will delineate all significant faults in the City, verify their ri
based on State Fault Evaluation Reports and other research, and recommend approprk
investigation procedures to be followed during project review.
Task 1.2:
Seismically Induced Surface Rupture
Seismicallv Induced Ground Shakinq
Leighton and Associates is on the State Board to create broad-scale maps of predicti
ground motion maps as part of the new State Hazards Mapping Program. Leighton v
use the same criteria to microzone the City at a scale of 1 inch = 400 feet.
Carlsbad is at risk from several regional seismic sources; the Elsinore fault to the ea!
the Newport-lnglewood fault to the north, the Rose Canyon fault to the south, and tt
cluster of ongoing seismicity offshore responsible for the M, = 4.3, July 1986 earthquak
Dr. Mehrdad Madhyiar, engineering seismologist, and Paul Sanchez, hazards mappir
specialist, will coordinate with David Evans and Associates (DEA) to develop the grour
motion map representing potential shaking from the principal seismic sources. Leightc
will do the following:
0 Grid the City into a series of digitized polygons compatible with the 1 inch = 41
foot resolution of the ground conditions (engineering geologic materia
distribution) map.
Calculate maximum probable seismic intensities for each grid unit. o
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0 Determine the greatest seismic intensity for each grid unit, represent
simultaneously the potential seismic sources noted above.
Modify the ground motion for each grid by a multifold classification schei
accounting for differences in surface geology.
Correct the ground motion data for amplification determined from the shear wi
velocity difference of Tertiary sediments relative to underlying granitic/volca
basement and depth to the basement contact.
An output file will be developed to merge with DEA's ARC/INFO GIs, which \
automatically contour the data at a scale of I inch = 400 feet.
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Task 1.3:
Types of seismically induced ground failure include liquefaction, earthquake-inducl
landsliding, and settlement.
Engineering geologic materials maps will be prepared for the liquefaction, slope stabili
soil and coastal erosion, and bedrock rippability studies. For this task Leighton will al
use the engineering geologic materials map to identify units in the City susceptible
settlement, including unengineered fill, old dumps, and recent alluvium.
Task 1.4: Seiches
Leighton will coordinate with the State Division of Safety of Dams as part of the da
analysis in Task 4 to assess the impact of minor flooding from Calavera Dam, San Marcc
Dam, and Squires Dam. Leighton will acquire Federal Emergency Management Agent
(FEMA) flood reports to determine whether effects of seiching are incorporated into IO(
and 500-year flood maps for lagoonal areas; if not, a methodology will be developed.
show the effect as a caution zone.
Task 1.5: Tsunamis
FEMA studies are the best indicator of tsunami vulnerability of the southern Californi
coastline. In some cases, such studies have been found to be more conservative tha
published National Insurance Flood Rate maps (NIFR). Detailed studies have not bee
translated onto NIFR maps because most coastal areas lack suitably detailed contoi
maps. With the 1 inch = 1 000-foot scale maps and resolute elevation control providec
Leighton will use a FEMA study by Lee, et. al. (1 982), to depict precise flood vulnerabilit)
the interaction of tsunami flood with onshore topography and land-based structures. Thi
map will be accurate enough to apply to a variety of regulatory and planning purposes
such as requiring the anchorage of potential debris and storage of hazardous material
in waterproof containers in tsunami hazard areas.
Seismically Induced Ground Failure
Task 1.6:
Leighton will compile catastrophic dam failure inundation maps obtained from either CIT'
or County archives, the dam owners, or the California Division of Safety of Dams. I
discussion of our analysis is provided in Section 2.4.
Seismically Induced Dam Failure
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Task 1.7: Slope Stability
The susceptibility of a slope area to failure is a function of slope steepness, the degi
to which the underlying geologic unit is prone to sliding, and the relative structural diF the Unit to the slope face. For example, the sedimentary units of the Santiago and Delr
Formations occur over a wide area of the City and contain thin clay seams and clay
siltstone and claystone units that make them more susceptible to slope instability a
landsliding than older granitic rocks or conglomerate units, Where the gently we
dipping sedimentary formations intersect a west-facing slope, the potential for instabi increases. For this analysis Leighton will do the following:
0 Delineate different geologic units in the City and determine their relati
susceptibility to slope failure.
Field check geologic contacts and structure in key areas where resolution can t
improved over California Division of Mine and Geology Maps and other availat:
research sources.
Overlay the slope gradient map (Task 3) with the engineering geologic materia
map.
Prepare interpretive maps of landslide susceptibility/slope instability, includir
coastal bluff stability.
The slope stability map to be prepared by Leighton, will show the relative susceptibilitie
of hillslope areas in the City, emphasizing slopes with inclinations greater than 40 percen
Because the failure style of nonearthquake-induced slope instabilities and landsliding WI
be similar to that of earthquake-induced failure styles, one slope stability map will b
prepared.
Task 1.8:
This will be a component of the engineering geologic materials maps and will take intc
consideration the susceptibility of coastal bluffs to both surface erosion and retreat duc
to wave action. Bedrock types, degree of fracturing, and slope stability will also bc
considered.
For the entire Carlsbad coastline, previous studies related to shoreline erosion and beact
retreat will be reviewed. An updated soil/coastal erosion map will be prepared b\
Leighton, indicating areas of increased historical erosion or areas of potential coasta,
erosion.
Task 1.9:
Areas of nonrippable materials will be mapped by Leighton. This will be an interpretative
map based on the identified geologic materials and their known ease or difficulty to
excavate.
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Soil and Coastal Erosion
Areas of NonripDable Material
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Task 1.1 0: Mudslides
Using the slope gradient determined from Task 3, and information on soil profile:
canyon margins, Leighton will outline areas along slopes in the City susceptiblc
mudslides. Such caution zones are designed to require a developer to conduct sedin
tranSpOfl studies to design debris basins and other debris and mudslide protec
devices,
Task 1.1 1 :
The engineering geologic materials maps will be used to derive expansive i
compressive units based on our experience and knowledge of the geologic units.
Task 1.1 2: Liauefaction Potential
As a first step in determining liquefaction potential, Leighton will identify saturat
cohesionless, Holocene sand and silt to demonstrate susceptibility of surficial depos
to liquefaction, a process describing the liquid like behavior of alluvium under grou
shaking. The City is dissected by a number of drainages containing Holocene sedimen
including Buena Vista Lagoon, Agua Hedionda, and Batiquitos Lagoon, and is bound
on the west by recent sands along the coast. Soil reports in CITY files, Regional Wai
Expansive and Compressive Soils
Quality Control Board information, and other available subsurface data will be ~~mp;h
for these areas to determine the following:
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Depth to perched and shallow ground water, up to 50 feet below the surface;
Texture (.01-.3mm) of the sediment and Standard Penetration Test (SPT) valuc
(N values of SPT between 0 and 25 blows); and
Thickness of the Holocene unit. 0
Leighton's maps of engineering geologic materials and shallow ground water will b
overlain to determine the distribution of alluvial areas susceptible to liquefaction, GIS dat
will be used to determine areas susceptible to liquefaction. GIS data wilt be used t5
determine areas of susceptible sediments that are shallow sloping (2 0.5 percent slope
to predict areas susceptible to more damaging liquefaction potential failure styles (flow!
and lateral spreading). Last, the ground motion data and thickness will be used tc
determine liauefaction potential and severitv. These factors take into account thc
probability that ground motion will be intense enough to initiate liquefaction, and the uni
thick enough to cause significant ground failure at the surface.
Task 1.1 3: Landslides
Existing landslides will be identified utilizing available aerial photographs, existing
landslide identification studies conducted by the California Division of Mines and Geology, ElRs prepared for the CITY, and other relevant studies. Per discussion with the CITY,
aerial photographs associated with the topographic base maps will be available for
analysis.
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Task 1.1 4: Subsidence
Coastal subsidence, particularly in low-lying lagoonal areas, can be initiated by a la
nearby earthquake, Leighton will investigate the pbtential for subsidence .
consequential inundation of near shore areas in Task 1.5 (Tsunami). The potentia
subsidence due to ground water withdrawal in areas of known existing wells will also
evaluated.
Task 2: Mineral Resources Inventow
Leighton will conduct a comprehensive review of available published and unpublished literati
to compile the location and type of commercial mining facilities which operate or have operat
in the City. The geotechnical database developed from Task 1 will allow Leighton and Associal
to identify potential mineral resources within the City and discuss their possible commerc
quality. Leighton will provide the following:
A. Identify and map type, location and quality of resources, including oil, gas and geothern
resources.
Map mineral resource areas classified or designated by the California Division of Minc
and Geology (CDMG). In addition, CITY files and County records will be reviewed f
evidence of mining operations or mineral resources.
Identify and map existing mining areas, including oil, gas and geothermal wells.
Preparation of one comprehensive map of the City showing the location of all know
mineral resources or mining operations.
B.
C.
D.
Task 3: SloDe Gradient Analvsis
Leighton will prepare a slope analysis map of the City. This map will identify slope areas in
mapped format that includes slope areas in excess of 40 percent, slopes that vary between 2
and 40 percent, and slope areas between 0 and 25 percent. Discussions with the CITY hav
determined the available digital topological data contains 3-D coordinates (X, Y, Z). Th
intermediate contour information has not been shown when the area between two index contour!
is too small to graphically show all of the contour information. Most of the areas of conflict, pe
CITY staff, appear to occur at a 40 percent or greater slope. A further review of the digita
topological data will be performed to determine the best course of action to generate the slopt
analysis.
David Evans and Associates will use the GIS to computer generate the slope analysis. The
computer-generated slope analysis will be accomplished using a Triangular Irregular Networkins
(TIN) process. The TIN process uses the contour data to generate a 3-D representation of the
City.
Task 4:
As part of this task, Leighton will develop catastrophic dam failure inundation maps. Information
will be obtained from various sources including the Division of Safety of Dams, Federal
Emergency Management Agency (FEMA) studies, and owners/managers of the Calavera Dam,
Catastrophic Dam Failure Analvsis
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Squires Dam, and San Marcos Dam. Based on this information, Leighton will present area:
potential inundation in a mapped format and data entered into the GIS system. Wh
information is not available, flooding will be modeled.
Existing and proposed land uses in the inundation path will be identified. A database
dependent or immobile populations and other critical facilities that currently lie in the path will
created for delivery to the CITY. Leighton will recommend incompatible land uses for futi
development proposed in such zones.
Task 5:
For the purpose of demonstration maps, DEA will provide the required GIS support services
Leighton and Associates. DEA will use in-house ARC/INFO systems to provide the requir
maps. DEA currently uses ARC/INFO on IBM 386 PC’s and Spare workstations. The followi
mapping exhibits will be generated,
Preparation of Demonstration Maps
0
0
0 Seiches
0 Tsunamis
0 Seismically Induced Dam Failure
0 Slope Instability
0
0 Areas of Nonrippable Soils
0 Mud Slides
0 Expansive/Compressive Soils
0 Liquefaction Potential
0 Landslides
0 Subsidence
0 Land-Use Compatibility Maps
0
0 Slope Analysis Maps
Known Active and Potentially Active Faults
Seismically Induced Ground Shaking and Surface Rupture
Area Subject to Soil Erosion, including Coastal Erosion
Inventory of Mineral and Soil Resources
0 Existing Mining Area Locations
DEA will work closely with the CITY and Leighton and Associates to generate the require
ARC/INFO mapping exhibits. The mapping portion of the project will consist of the followin
tasks:
0 Refine the mapping requirements
0
0
0
0
0
0
Review existing paper maps and digital topological data
Define a GIS database structure
Enter the required mapping information into the ARC/INFO system
Prepare and plot the mapping exhibits
Deliver plots and digital information to the CITY
Assist CITY staff to load digital data on their GIS
Leighton and Associates will perform the required analysis for the project except for the slopc
analysis, which will be generated by DEA. The digital topological data provided by the CITY wi
be entered into DEA’s GIs. DEA will provide Leighton and Associates with computer-generatec plots of the topological information showing roads, road names, contours, elevations, etc
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Leighton and Associates will highlight the specific information on the plots and provide DEA
a product ready to be entered into the GIs. The mapping information will be entered into the
using large digitized tables. GIs technicians will digitize the mapping information into
appropriate layers, ARCIINFO coverage. GIS specialists will concentrate on entering
attribute/textual information and generating the required mapping exhibits. This procedure
be used to generate all of the required map exhibits, except for the seismically induced gro
shaking and slope analysis.
Leighton and Associates will use a computer program to determine the induced ground shah
based on the bedrock types and earthquake magnitude, and provide DEA with a computer
containing the results. The results of the computer program will be entered into the GI$
graphically show the affected areas.
The final deliverables will include 1 inch = 1000-foot scale maps of each required mapp
exhibit and a magnetic tape and/or floppy disks of the ARC/INFO data. DEA will deliver the di
in standard drawing exchange format, DFX. However, since the CITY and DEA have direc
compatible ARC/INFO systems, the digital data could be delivered in ARC/INFO Export form
The Export format is the standard file structure used to transport digital information betwe
ARCIINFO systems. The Export format also permits all attribute information entered into the C
to remain intact. DEA will also assist the CITY in installing the generated digital mappii
information onto their GIs.
Task 6: Land-Use Compatibilitv Matrix
This task will be formulated utilizing the geotechnical data base developed in Task 1 and tt
manual of guidelines for review of development proposals which will be prepared as part of Taz
8. The land-use compatibility map and matrix will identify and rate potential areas of geotechnic
risk and assign appropriate levels of investigation with respect to the type of developme1
planned.
Task 7: Review and Recommend Chanqes to Existinq Geotechnical Policies, Ordinance:
as well as the Geotechnical Portion of the Safetv Element of the General Plan
Leighton will review all pertinent existing ordinances, codes, policies and guidelines for adequac
in meeting State Law as well as meeting the needs of the City. Leighton will meet with City sta
to discuss the issues and will then prepare a report recommending revisions and additions tc
the City’s existing geotechnical policies, ordinances, as well as the geotechnical sections of thc
Safety Element of the General Plan. These recommendations will address developmen
standards for projects along faults, areas of unstable soil conditions, areas of known minera
resources, and areas subject to coastal erosion, etc. Revisions will be submitted in a formal
whereby deletions are lined through and additions are in bold typeface. The first draft will bs
submitted to City staff, the development community and other interested parties. The draft wil
be revised once with agreed upon changes. The recommended revised ordinances and revisec
General Plan Element sections will be delivered to the City in City of Carlsbad Ordinance and
General Plan format,
Task 8:
This task is supportive and integral to the success of the development standards. Without a
competent technical review, even the most stringent development standards are rendered
ineffective. Preparing a manual for the CITY to use in the review of technical development
studies will standardize that process and provide a basis from which to regulate professional
7
Manual of Guidelines for Review of Development Proposals
a e
practice, and ultimately enhance public safety. To prepare the manual, Leighton will format tl City of Carlsbad manual in a similar manner to that of the City of San Diego, including extensi
graphics and additional issues such as blasting. Development standards for coastal bluff are
will be formulated. The manual will also include the types of filed studies which the City shot
require for evaluating development proposals faced with each geotechnical risk factor; t
submittal requirements for each study; set out standard alternative mitigation techniques to ab:
nonrippable soils and establish standards and programs for blasting within areas of habitat
buildings, areas with structures of any type, and areas devoid of structures.
In addition to the review manual, Leighton will prepare a small information-oriented booklet. TI
booklet will explain the geologic conditions of Carlsbad, how they impact the homeowner, dang
signals, and mitigation techniques of which a property owner should be aware. This brief book'
entitled The Geologic Story of Carlsbad; What Does it Mean for You?", will be written
nontechnical terms, will be well illustrated, will include seismic risk and safety tips, and may I
distributed over the counter.
Task 9: Deliverable Products
existing or potentially adverse conditions, The manual will also address the blasting
Task 9.1 : First Draft
Upon completion of the above tasks, Leighton and Associates will compile and subn
the first draft of the geotechnical portions of the Zoning Ordinance. The first draft repc
would contain the demonstration maps and all supporting analytical statements describt
in the scope of work. The first draft submittal will include the following:
A. Individual and combined reproducible mylar maps at 1 inch = 1000 foot scale, 1
the following:
0
0 Seiches
0 Tsunamis
0 Seismically induced dam failure
0
0 Existing mining area locations
0
Known active and potentially active faults
Inventory of mining area locations
Slope analysis indicating 40% slopes with City boundaries.
B. Individual and combined reproducible mylar maps at 1 inch = 400 foot scale, (
the following:
0
0 Slope instability
0
0 Areas of nonrippable soils
0 Mud slides
0 Expansive/Compressive Soils
0 Liquefaction pot en t i at
0 Landslides (developed and undeveloped areas)
0 Subsidence
Seismically induced ground shaking and surface ruptures.
Areas subject to soil erosion, including coastal erosion
8
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',
0 Land-use compatibility
0 Slope analysis of slopes 0-15%, 25-40%, and 40+%
.C. Land-use compatibility matfix
D.
E.
F.
G.
H.
Analysis of flooding due'to dam failure
Geotechnical portions of the Zoning Ordinance
Manual of guidelines for review of development proposal
The Geologic Story of Carlsbad
Digital files of the following items, in ARC/INFO format:
0
0
0 Seiches
0 Tsunamis
0 Slope lnstability
0
0 Areas of Nonrippable Soils
0 Mud Slides
0 Expansive/Compressive Soils
0 Liquefaction Potential
0 Landslides
0 Subsidence
0 Land-Use Compatibility Maps
0
0 Existing mining Area Locations
0 Slope Analysis Maps
Known Active and Potentially Active Faults
Seismically Induced Ground Shaking and Surface Ruptures
0 Seismically Induced Dam Failure
Area Subject to Soil Erosion, including Coastal Erosion
Inventory of Mineral and Soil Resources
Task 9.2:
Subsequent to the CITY'S review of the first draft report, Leighton and Associates E
DEA will work closely with the CITY to incorporate the desired revisions and comme
into the second draft submittal. We anticipate only minor revisions will be necessary a
the CITY'S review of the second draft. As such, Leighton and Associates has budge
fees to prepare two drafts prior to the submittal of the final product. Provided the C
reviews are conducted in a prompt manner, we anticipate that all work will be comple
within approximately six months.
Second Draft and Final Product
Task 10: Reproduction Work
With the exception of the reproduction costs to prepare and review all draft docume
prepared by Leighton and Associates, specific funds have not been allocated in i
Leighton and Associates Contract for final document reproduction work. Costs for.
9
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reproduction of final maps, final reports, the recommended revised geotechnical port of the Zoning Ordinance, the guidelines manual, and the information booklet have bt
estimated herein for budgetary purposes only. The actual reproduction work will be dc
by the City's vendor of choice.
Section 10.1
A.
Deliverable Products to the Ci+q
The following documents are to be provided in Wordperfect format (or translatal
format) on a 3.50, disk and one (1) camera-ready master hard-copy, for black a
white copies:
1.
2. Appendices to above document.
3.
4.
Final draft of the geotechnical portions of the Zoning Ordinance.
Guidelines manual to be used for the review of technical developmc
standards, submittal requirements, and mitigation techniques.
Information booklet (The Geologic Story of Carlsbad; What Does It Me
For You?)
AML:rvo:lh:?
Leighscp.1
-
10
e 0 H''Hb-' tl
LEIGHTON AND ASSOCIATES INC.
Geotechnical and Environmental Engineering C
April 26, 1991
(Revised July 22, 1991)
Project No. 89 10296
To: City of Carlsbad
Planning Department
2075 Las Palmas Drive
Carlsbad, California 92009-4859
Attention: Ms. Adrienne Landers, Senior Planner
Subject: Revised Cost Proposal
Geotechnical Hazard Analysis and Mapping Study
Carlsbad, California
In accordance with your request, we are herewith submitting our revised cost proposal for
Geotechnical Hazard Analysis and Mapping Study. This cost estimate has been based on the revi:
scope as discussed with you on July 16. 1991. A copy of that scope will be included as part of
contract documents. The cost €or each individual task is summarized below.
Task Description cost
1 Identification and Hazard Mapping $16,250.00
2 Mineral Resources Inventory 1,592.00
3 Slope Gradient Analysis 3,572.00
4 Dam Inundation Analysis 2,692.00 '
5 Preparation of Demonstration Maps 17,192.00
6 Land-Use Compatibility Matrix 7,168.00
7 Geotechnical Policies and Ordinances 8,245.00
8 Development Guidelines Manual 13,295.00
9 Deliverable Products 23,425.00
Total Cost* $93,431.00
Supplies will be billed on a cost plus 15 percent basis and will
be billed separately from this contract.
*
3934 MURPHY CANYON ROAD, SUITE 8205, SAN DIEGO, CALIFORNIA 92123 (619) 292-8030 (800) 447-
FAX (619) 292-
e e 8910292
e
A breakdown of the estimated costs for each individual task is attached as Figure 1.
With regard to the City of Carlsbad Standard Contract, we have reviewed these documents and ai
to the terms and conditions.
We are looking forward to working with the City on this challenging and rewarding project and
prepared to commence work immediately upon receiving authorization to proceed. If you have
questions, please contact this office.
Respectfully submitted,
LEIGHTON AND ASSOCIATES, INC. I4- Michael R. Stewart, CEG 1349
Chief Geologist
/lL-
Stan Helenschmidt, GE 2064
Chief Engineermanager
Attachment:
Distribution: (2) Addressee
Figure 1 - Project Cost Schedule
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