HomeMy WebLinkAbout1987-04-14; City Council; Resolution 9022"4
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RESOLUTION NO. 9022
A RESOLUTION OF THE CITY COUNCIL OF THE
CITY OF CARLSBAD, CALIFORNIA, APPROVING
REIMBURSEMENT AGREEMENT BETWEEN CITY OF
LOS ANGELES AND CITY OF CARLSBAD FOR THE PRELIMINARY STUDY OF THE BATIQUITOS LAGOON ENHANCEMENT PLAN.
WHEREAS, City of Los Angeles acting by and through the
Board of Harbor Commissioners (BOARD) and the City of Carlsbad
(CITY) intend to pursue a proposed project identified as the enhancement
of Batiquitos Lagoon (PROJECT) as mitigation for Los Angeles harbor
fills requiring an Environmental Impact Report (El R) and Environmental
Impact Statement (EIS); and
WHEREAS, in order to adequately scope the EIR/EIS and to
determine whether the lagoon enhancement project is feasible, preliminary
engineering design and related technical studies and cost estimates must
be completed, and
WHEREAS, BOARD and CITY will be parties to an Agreement
( ''MOAg1) with various federal and state agencies which will establish
procedures and responsi bi I i ties for design, construction and maintenance
of the Project; and
WHEREAS, BOARD desires to fund the amount necessary to
carry out the preliminary engineering studies prior to and until said
MOA has become effective;
NOW, THEREFORE, BE IT RESOLVED as follows:
1. The above recitations are true and correct.
2. The attached agreement entitled "REIMBURSEMENT
AGREEMENT" between the City of Los Angeles and City of Carlsbad
is hereby approved.
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3. Mayor is hereby directed to sign agreement on behalf
of City of Carlsbad.
PASSED, APPROVED AND ADOPTED at a regular meeting of
the Carlsbad City Council held on the 14th day of April , 1987
by the following vote, to wit:
AYES: Council Members Lewis, Kulchin, Pettine, Mamaux, and Larson
NOES: "-Le
ABSENT: None
ATTEST :
ALETHA L. RAUTENKRANZ, City Cle\k
(SEAL)
CLAUDE A. LEWIS, Mayor
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REIMBURSEMENT AGREEMENT
REIMBURSEMENT AGREEMENT BETWEEN THE CITY OF CARLSB AND THE CITY OF LOS ANGELES FOR THE PREPARATION OF THE PRELIMINARY ENGINEERING DESIGN AND RELATED TECHNICAL STUDIES FOR THE BATIQUITOS LAGOON ENHANCEMENT PROJECT
THIS AGREEMENT is made this y* day of bhj , 1987, between the CITY OF CARLSBAD, a municipal corporation of the State of
California, hereinafter referred to as CITY, and the City of Los Angeles
acting by and through the Board of Harbor Commissioners hereinafter referred
to as BOARD.
RECITALS
WHEREAS, BOARD and CITY intend to pursue a proposed project
identified as the enhancement of Batiquitos Lagoon (Project) as mitigation for 10s Angeles harbor fills requiring an Environmental Impact Report (EIR) and
Environmental Impact Statement (EIS) ; and
WHEREAS, in order to adequately scope the EIR/EIS and to determine
whether the lagoon enhancement project is feasible, preliminary engineering
design and related technical studies and cost estimates must be completed; and
WHEREAS, BOARD and CITY will be parties to an Agreement ("MOA") with
various federal and state agencies which will establish procedures and responsibilities for design, construction and maintenance of the Project; and
MHEREAS, BOARD desires to fund the amount necessary to carry out the
preliminary engineering studies prior to and until said MOA has become
effective;
NOW, THEREFORE, in consideration of the covenants and conditions, it
1. CITY will engage the firm of CHEM Hill hereinafter referred to as CONSULTANT to perform the necessary prel iminary engineering for that area more particularly depicted upon a site map attached as Exhibit "A" - Batiquitos Lagoon Enhancement Plan.
is agreed as follows:
2. It is understood that CONSULTANT'S services shall conform to the
To carry out these eighteen tasks specified in the Scope of Work attached as Exhibit B and made a part of this agreement. tasks, Consultant shall :
(a) Conduct field explorations;
(b)
(c) Write reports; and
Communicate weekly with the CITY staff;
(d) Perform such other work as necessary to properly evaluate
the proposed Project.
3. It is understood that Exhibit B - Scope of Work pertains only to
the preliminary engineering and related technical studies
necessary to determine the estimated project costs and engineering feasibility and to adequately scope the work required
for an EIR/EIS.
BOARD, CITY and CONSULTANT for the preparation of the EIR/EIS. Separate agreements may be entered into by
4. BOARD shall pay to CITY the actual cost of CONSULTANT'S services provided these costs shall not exceed $392,000.00 without prior written approval of BOARD plus actual CITY administrative costs, not to exceed $50,000.00. Such cost shall be based on the fees set forth in Exhibit B and shall be payable as Consultant completes and bills for work performed on each of the eighteen
tasks .
CONSULTANT'S invoices, in accordance with Section 5 of the
engineering agreement between CITY and CONSULTANT, shall be forwarded monthly to BOARD for direct payment to CONSULTANT by BOARD in a timely manner. Monthly invoices for actual CITY administrative costs, shall be paid by BOARD in a like manner. Said invoices shall be fully documented by CITY.
5. It is understood that CONSULTANT shall be an independent
contractor of CITY.
6. It is understood that BOARD shall provide CITY with a Project
Manager to assist CITY in carrying out the preliminary engineering studies. The Project Manager shall report to and take direction from CITY, through the City Manager or his designee, provided however, that CITY agrees that it will at all times consult with BOARD if BOARD expresses any concerns regarding the Project and will implement all requests of BOARD unless it expressly finds such requests are unreasonable. The Project Manager shall comply with all laws, rules and policies of CITY and may be removed by BOARD or the CITY, after consultation with BOARD, if his/her performance is in any respect
unsatisfactory. The Project Manager shall be provided appropriate office space and facilities, if available, (phone,
copier, files, etc.) by CITY.
7. It is understood that, since BOARD is advancing funds for
preliminary engineering work which may be accomplished and paid for in accordance with Sections 5 and 9 of said MOA, BOARD shall be reimbursed for the actual amount of its payments to CONSULTANT and CITY from the Escrow Account established under the terms of the MOA, upon written request by BOARD. right to terminate the work of CONSULTANT at anytime for any reason as long as BOARD reimburses the CONSULTANT and CITY for costs incurred to date. Such termination shall be accomplished by BOARD providing CITY a written notice and CITY terminating the CONSULTANT'S Agreement as provided in that Agreement.
BOARD shall have the
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8. The work product of CONSULTANT shall be owned jointly by CITY and BOARD. CONSULTANT are proprietary information which have an economic value to a person restoring the lagoon. does not proceed with the project, it agrees that CITY may use the plans developed by CONSULTANT to itself restore the lagoon.
CITY agrees that if any other person wishes to restore the lagoon and use such plans, that BOARD shall be entitled to be reimbursed from such person the value of the plan to the extent BOARD funds have paid for the work of the CONSULTANT.
CITY and BOARD agree that the plans developed by
If for any reason BOARD
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IN WITNESS WHEREOF, the parties hereto have executed this agreement on the day and year first above written.
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CITY OF CARLSBAD, a Municipal Corporation of the State of California
BY
CITY OF LOS ANGELES, a Municipal
Corporation of the State of Cal i forni a
ATTEST :
APPROVED AS TO FORM:
Assistant City Attorney
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APPROVED AS TO FORM:
1P7 JAMES K.'/AHN City Attorney
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Assistant
VEH: lm
3 /24 /8 7 CSc3-5387
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EXHIBIT 8
111. SCOPE OF WORK
CHZM HILL
BATIQUITOS LAGOON ENHANCEMENT PLAN PREDESIGN
Revised August 13, 1986
Revised-February 5, 1987
Revised February 18, 1987
Revised February 22, 1987
TASK PI--LAGOON INSTRUMENTATION TO CALIBRATE MODEL
08 JECTIVE
Determine the water levels and current speeds and directions
in each of the three Batiquitos Lagoon basins under the
influence of real ocean tides and to ascertain the friction
factor at the three choke points and the east basin to
calibrate the hydrodynamic computer model and observe the
sediment transport process at the entrance.
METHODOLOGY
The east, central, and west basins of the lagoon will be
instrumented with four current meters and four tide gages.
The mouth of the lagoon will be opened by bulldozing the
sand and gravel sill aside, The instruments will record
water levels and circulation currents in the deeper parts of
the three basins for 10 days, A cross-section at the opened
inlet will be surveyed three times in the 10 days.
The client will arrange for any permits needed to conduct
this task. Consultant will furnish a description of the
planned opening and instrumentation.
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PRODUCT
Tabulation of tides, water levels, current speeds and
directions as a function of time to be used as input into
RMA2 .
TASK PZ--MODEL CIRCULATION OF PREFERRED ALTERNATIVE
OBJECTIVE
Using water elevation records and current data from the
lagaon instrumentation task, and lagoon geometry from
the fathometer survey task and digitizing map task,
model RMA2 will be run to evaluate circulation, mixing,
flushing, and tidal prism propagation in the'lagoon assuming
implementation of the preferred alternative.
METHODOLOGY
The hydraulic analysis will be done using the Corps of Enqi-
neers' two-dimensional flow model called RMA2 (or TABS2,
which is an integrated combination of RMA2, RMA4 and SED4).
This model will be run for the preferred alternative (Plan 1).
The results will be compared to the establikhed goal and
objectives for compliance.
PRODUCTS
A calibrated hydrodynamic model of Batiquitos Lagoon and a
series of maps (figures) showing circulation patterns in
Batiquitos Lagoon for the Preferred Alternative.
input data for RMA4 will be generated.
Also,
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TASK P3--MODEL CIRCULATION OF TWO DEVELOPMENT OPTIONS
OBJECTXVE
The circulation, mixing, flushing, and tidal prism
propagation in Batiquitos Lagoon for Plans 2 and 3 will be
evaluated.
METHODOLOGY
Lagoon geometry for Batiquitos Lagoon conforming to Plans 2
and 3 will be developed and modeled.
evaluate circulation, mixing, flushing, and tidal prism
propagation.in the lagoon.
the project goals and objectives for compliance.
RMA2 will be run to
The results will-be compared to
PRODUCT
A series of maps (figures) showing circulation patterns in
Batiquitos Lagoon and input data for RMA4 will be generated
for Plans 2 and 3.
TASK P4--EXISTING DATA
OBJECTIVE
Obtain all pertinent information and data on Batiquitos
Lagoon to assist in engineering design aspects and prevent a
duplication of study efforts.
METHODOLOGY
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Existinq data will be gathered on such items as:
0 Bridge plans from CalTrans
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Contour maps of lagoon
Bench mark identification and horizontal and ver-
tical coordinates
Right-of-way surveys
Easements
Vpland erosion and sedimentation rates
Plans for existing utilities and gas line
Test holes data from bridge investigations and
other studies
Stream flow hydrographs
Tide and tidal current data
Littoral drift
Previous modelling efforts
Previous beach profiles
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Traffic counts and traffic patterns
Noise measurements
Dredging records of other California tidal inlets
Air quality analyses
Water quality data
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o Copies of city, state, and federal engineering
standards
The data will be reviewed to identify gaps in the required
information.
to project engineers and preparers of the EIR/EIS.
Copies of the data will be assembled and sent
PRODUCT
Sets of information and data to assist in initiating such
activities as computer modeling, preparation of master map,
grading plans, inlet design, and dredging and disposal plan.
TASK PS--BATHYMETRIC SURVEY
OBJECTIVE
There are no survey data for the deeper sections of
Batiquitos Lagoon west of 1-5.
provide data to fill this gap in the lagoon geometry.
A bathymetric survey will
METHODOLOGY
A bathymetric survey consisting of a series of tracklines
on a 100-foot grid across the lagoon west of 1-5 will be
conducted. Bathymetric records will be reduced and contours
generated for the unmapped sections of the lagoon.
PRODUCT
A contour map at 1"=100' scale, with 1-foot contour
intervals will be produced to supplement the existing
contour map.
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TASK P6--SOILS AND LABORATORY ANALYSIS
OBJECTIVE
The soil/sediment analysis will be undertaken to resolve the
question of whether the soils in the east end of the lagoon
are contaminated with pesticide residues or toxic materials
identified in'the testing described below, The information
resulting from the analysis may be used to apply for permits
for dredging, Section 404 inwater disposal, and ocean dumping.
METHODOLOGY
Soils conditions in the western portions of the lagoon have
been evaluated for structural purposes to some extent, but
soils in the eastern portion require additional sampling and
mechanical analyses. There appear to be anomalies in the
lagoon depositions, which will require analysis sufficient
for engineering dredging and disposal, grading designs, cost
estimating, and structural uses on- and offsite, No chemi-
cal testing of soils has been done, We have not had access
to any of the boring logs or test results from previous
sampling efforts: therefore, our proposed sampling/testing
effort contains a degree of uncertainty.
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From a recent conversation with a representative of the
,Corps of Engineers, South Coast'District, it appears than an
accurate estimate of bioassay/bioaccumulation studies neces-
sary for the Enhancement Plan design cannot be made without
knowledge of the chemical characteristics of the lagoon
sediments. For ocean disposal, the Corps requires bioassays
on three particular species (zooplankton and invertebrates)
in both the solid phase and the liquid phase, According to
the Corps representative, a proposed bioassay program must
be submitted to the Corps for approval: the proposed program
should be based on knowledge of the sediment chemical char-
acteristics.
provide enough information to develop a bioassay program for
Corps approval. However, a bioassay is not included in this
scope ,
Our proposed chemical sampling program will
Sampling for potential contamination and permitting purposes
will be required. Possible contamination from offsite activ-
ities has been raised as a concern, due to agriculture and
other upland uses. Potential contamination must be deter-
mined for construction purposes (health and safety, air
quality, etc.) and for disposal options analysis (i-e., will
there be limitations to disposal siting) .
There will be soil samples taken from five locations for
chemical and physical sampling, and 20 locations for physical
sampling throughout the lagoon.
either hand-driven coring or float mounted vibra-core equip-
ment,
mudline of 10 feet, or an elevation of -8 feet (MSL).
Samples will be taken with
Each hole will be cored to a maximum depth below
The samples for the chemical testing will be taken adjacent
to the creek mouths and the nursery area and at certain
drainage points around the lagoon. Samples will be composited
and undergo elutriate tests for the following: metals, cya-
nide, total phenol, acid extractables, base/neutral extract-
ables, pesticides/PCB's, chlordphenoxy herbicides, and
volatiles. In addition, each will undergo a bulk sediment
analysis to meet the Corps of Engineers criteria. The
sampling program is designed to resolve the issue of contami-
nated soils and to provide the information necessary for
dredging pennits and development of a bioassay program for
Corps approval. A two-page summary of the methods proposed
will be submitted to the client for their coordination with
EPA and the Corps of Engineers,
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L Twenty test holes will be cored for determination of physical
characteristics of the proposed dredged material.
taken would be subjected to laboratory classification
(including grain size analysis). The cores will be from
throughout the lagoon and we propose using coring equipment
as mentioned above. Samples from each test hole will be
placed into plastic jars for grain size laboratory analysis.
Samples
CHZM HILL will conduct both the sampling and the laboratory
analyses unless another local EPA certified laboratory
demonstrates it can be as expeditious. CHZM HILL has two
EPA certified labs in Redding, California and Corvallis,
Oregon .
Any permits required and/or access permission needed will be
acquired or arranged by the client.
PRODUCT
Results of soil sampling and testing will be included in a
Forty Percent Predesign Report. Maps of test hole sites,
boring logs, and physical and chemical laboratory test re-
sults will be included in the Preliminary Design Report.
TASK P7--TIDAL INLET ANALYSIS
AND PRELIMINARY DESIGN
OBJECTIVE
The purpose of this task is to develop the preliminary design
of a self-maintaining tidal entrance to the Batiquitos Lagoon.
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METHODOLOGY
This task will be performed in the following manner:
o Collect and analyze current and historical data on
the physical and geological processes relating to
the lagoon outlet and its adjacent coastal and
nearshore region.
be reviewed including the Coastal Conservancy's
Enhancement Plan, the previous reports by the
Scripps Institution of Oceanography, comments by
Waterways Experiment Station (WES) and local
interests,
Relevant literature will also
o Perform a bathymetric and sub-bottom profile survey
of the offshore sea bed surrounding the lagoon
outlet in order to obtain high-resolution informa-
tion of the site-specific boundary condition in
support of the entrance design. A total of seven
survey transects will be deployed within 300 feet
upcoast and downcoast of the outlet, extending to
a depth of 30 feet.
o Perform a conceptual, functional design of the
tidal entrance,
the supporting rationales as well as estimates of
silting rates in the .lagoon and closure frequencies
in consideration of tidal fluctuations, storm
frequencies and regional coastal sediment budget.
The design will.be accompanied by
o Perform a preliminary, structural design of the
tidal entrance, accompanied by the provisions for
jetties or no jetties, channel dimensions and
configurations, specification or armor types for
the channel and the jetty, and preliminary design
drawings ,
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o Analyze potential impacts of the proposed entrance
design, with special reference to possible disrup-
tion to the longshore sediment transport, and alter-
ation of water circulation and quality in the
adjacent oceanfront area which might adversely
affect surfers, swimmers and other beach users,
'0 Evaluate construction methodologies, construction
scenarios, schedules, and costs, and provide pre-
liminary estimates and specs on labor, material
and -equipment.
o Develop maintenance methodologies, schedules and
costs .
PRODUCTS
The Preliminary Design Report will summarize the rationale,
the preliminary design, the construction methods, the esti-
mated costs for construction and maintenance, and the main-
tenance procedures.
TASK P8--WATER QUALITY ANALYSIS
OBJECTIVE
The purpose of this task is to examine how the lagoon cir-
culation of the preferred alternative affects water quality,
specifically salinity and temperature. The hydrodynamic
analysis is assumed to provide sufficient circulation data
for water quality assessment in the lagoon on a seasonal
basis.
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METHODOLOGY
The sensitivity of the preferred alternative lagoon config-
uration will be examined for its impact on lagoon water
quality. This evaluation will provide assessments of the
design to maintain acceptable water quality and habitats for
each of four seasonal conditions. Seasonal projections are
necessary due' to the physical, habitat , environmental, and
climatological changes experienced throughout the year.
The specific tidal hydraulic information developed during
the Enhancement Plan studies will be used to provide the
data required to evaluate water quality characteristics.
The results of RMA-2 circulation model will feed into a sec-
ond Corps model (also two-dimensional) called RMA-4, which
models water quality. With RMA-4, we can model dissolved
oxygen, temperature, biological oxygen demand, and salinity
in the lagoon askuming a purely advection-dispersion mass
transport without detailed kinetic relationship. RMA-4 has
the potential to handle one or two conservative substances
in addition to the parameters listed above: we will
determine which, if any, should be modeled based on input
from our biologists,
The sensitivity of Batiquitos Lagoon to climatological con-
ditions, circulation patterns, and runoff water quality is
integrated into the water quality analysis. We will permit
examination the seasonal variations of water quality.
Existing data and analytical techniques will be utilized for
this effort, and are assumed to be sufficient for,the
required analysis.
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PRODUCTS
The water quality assessment of the Enhancement Plan will be
summarized in the Preliminary Design Report complete with
data, assumptions, methods, results, and conclusions.
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The product will include a recommendation and/or confirma-
tion of continued water quality monitoring and analysis,
sedimentation monitoring, and closure/erosion process data
near the mouth. Because certain estuarine processes are
difficult to project accurately, this data collection and
monitoring program concept may be necessary for reevaluation
of lagoon operations in the future.
TASK P9--PRELIMINARY ENVIR0"TAL REVIEW
OBJECTIVE
The objective is to review early design concepts to
determine if the resulting enhancement project will provide
suitable habitat for biota.
An important aspect of the engineering proqram is inter-
action between engineers and biologists to ensure that the
project design fulfills the biological goals of the concep-
tual plan considering the data already developed as part of
the HEP. Our approach involves an iterative feedback pro-
cess. The results of the circulation and water quality
model are reviewed by biologists to determine how well they
meet the criteria for fisheries and bird habitat. If
necessary, the biologists suggest modifications which can be
used to refine the grading plan and remodel circulation and
water quality. The process may require up to three adjust-
ments to achieve a good fit between engineering design and
biological requirements.
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PRODUCT
Minor adjustments will be made in design concepts to better
accommodate biological needs.
TASK P10--DIGITIZE MAPPING
OBJECTIVE
Contour maps of the existing and proposed topography of
Batiquitos Lagoon will be prepared to provide base maps,
develop the grading plan, and determine the volume of
material tg be dredged.
METHODOLOGY
Topography for the existing lagoon, the recommended
(preferred) plan and one alternative, will be digitized
using CADD. Maps will be prepared at a scale of 1"=100'
with 1-foot contour intervals in the areas to be dredged.
Topographic and bathymetric data collected under the fathom-
eter survey task will be digitized to complete the existing-
condition and preferred-plan maps. Volume differences will
be computed.
PRODUCT
Three contour maps will be produced. The dredge volumes
will be surmnarized in the Preliminary Design Report.
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TASK Pll--DREDGING AND DISPOSAL PLAN
OBJECTIVES
The purpose of this task is to prepare:
o A lagoon dredging plan to create 220 acres of sub-
tidal habitat, 170 acres of intertidal habitat,
and 135 acres of supertidal habitat.
o An alternative dredging plan to the one above.
o A plan, schedule, and cost estimate to properly
dispose of approximately 3 million cubic yards of
sand and mud (wet silts and clays).
METHODOLOGY
The conceptual plans for the dredged configuration will be
coordinated with the circulation studies to optimize flush-
ing and conform to the Enhancement Plan. Design criteria
will be supplied by the client.
Results of the soil testing will be reviewed to determine if
any contaminated sediments are present. If -contaminants are
present, those areas will be delineated for special handling
procedures. This could include 'locating approved disposal
site(s), surveying potential haulers, and initiating the
permitting process for dredging, hauling, and disposing of
toxic materials. If no contaminated soils are found, the
entire dredging process is simplified.
Grain size results will be reviewed to delineate homogeneous
soil types. A list of potential dredging contractors and
disposal sites will be developed. A telephone survey will
be conducted to assess contractor interest, equipment
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available, equipment rates, and scheduling. Disposal site
operators will be queried as to ability to take 3 million
yards of material, site location, transportation available,
and costs.
Reasonable and proven methods of excavation will be ex-
plored.
be identified; work capacities estimated, handling require-
ments catalogued, and costs estimated, Adequate dredging
schemes and techniques will be documented.
Proper sizes and types of dredging equipment will
A set of dredging plans (contours and/or slope grades) will
be drawn up for each of the alternatives using our CADD sys-
tem.
ground contours and dredging quantities computed.
The dkedging plans will be compared to the existing
The amount and character of sediments to be removed will be
reviewed to schedule when and from what part of the lagoon
the different soil types will be removed. Sa'nd will be eas-
ier to handle and will be more valuable (as commercial
aggregate, for beach nourishment, or as structural fill)
than the muds. Once the various layers have been identified
an@ tagged as to haul method and destination, a schedule (in
flow chart fashion, similar to CPM) will be drawn up to
optimize the disposal, avoid delays due to traffic
conflicts, and put the disposal site facilities on notice to
receive the material.
Habitat requirements of the least tern will be supplied by
the client. Provisions for protection of least tern nesting
and foraging will be included in the Preliminary Design
Report.
A cost estimate will be prepared which will include engi-
neering and administrative costs, hauling of the material to
the disposal site (whether by truck, slurry pipeline, *barge,
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ship, or train), spreading of the material at the disposal
site, and any post-disposal costs (such as grading or plant-
ing the disposal site(s), marking and/or fencing the
disposal site(s), renting the disposal site(s) for a number
of years, or turning the disposal site(s) into special habi-
tats).
Beach nourishment as a means of disposal is discussed else-
where,
PRODUCTS
A set of preliminary dredging plans consisting of new con-
tours (dark,) for each of the preferred plan and Phase I
superimposed on the existing contours (screened). A dredge
disposal plan consisting of schedule, locations, haul
methods and routes, flow charts, and cost estimates, All
will be included in the Preliminary Design Report,
TASK PlZ--GAS LINE RELOCATION
OBJECTIVE
At least one gas line is known to cross thedlagoon and will
require relocation. The existing line will be located and a
relocation scheme developed,
METHODOLOGY
The Southern Cities Gas Company will be queried as to the
exact location of their gas pipeline across Batiquitas
Lagoon, Relocation schemes will be developed, discussed
with Southern Cities Gas Company and Caltrans, and a pre-
ferred relocation scheme selected. Conceptual drawings of
the preferred relocation scheme will be prepared,
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PRODUCT
A discussion of the relocation scheme and drawings will
appear in the Preliminary Design Report.
TASK P13--SEDIMENT CONTROL PLAN
OBJECTIVE
The purpose of this task.wil1 be to examine and evaluate the
proposed sediment control plan and to integrate the resul-
tant net sedimentation to the Batiquitos Laqoon with a sedi-
ment transpdrt model of the lagoon. This will be performed
for the preferred plan and one alternative. Estimates of
net sediment movement to the lagoon area from'both upland
loadings and ocean loadings will be developed to evaluate
potential maintenance requirements.
These analyses will be determined for the hydrologic condi-
tions used in the Preferred Plan.
METHODOLOGY
The upland erosion and sedimentation rates for the drainage
areas surrounding Batiquitos Lagoon will be examined using
the available data. Where data on sediment yield in the
basins are lacking, correlation estimates will be used for
similar drainages nearby which have sediment load data. The
design storm used will be the one anticipated to yield the
greatest sediment deposition.
Grain size distributions of both suspended sediment data and
bed material data in the study area will be used to estimate
the effectiveness of the proposed sediment basins. Sample
streambed sediment data will be collected in the major
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drainages to better estimate the bed material deposition
mechanics.
Analytical methods for bed sediment transport and sediment
basin performance will be required to confirm the sediment
yield to the lagoon, both suspended and bed material.
Estimates of suspended sediment concentrations and loads
will be made 'from available data.
in the bottom sediments of the present lagoon suggest a
substantial fraction of the net sediment yield to the lagoon
is suspended sediments. This suspended material is not
easily trapped.
The silt and clay layers .
Major percentages of the total sediment yield to the site
are probably carried during high runoff events. These storm
conditions are usually accompanied by high waves and tides
along the coast. Both of these conditions are linked
together through the inlet hydraulics and conditions at the
boundary of the lagoon.
The potential for the lagoon to transport, circulate, scour,
and deposit these sediment materials will be examined by
coupling the estimated sediment loads with the hydrodynamics
of the lagoon.
As noted, the hydraulic analysis of the Preferred Plan and
alternatives will be done using the Corps model RMA-2. The
results of RMA-2 will be used for input to a second model,
if needed, to examine sediment movement. This 2-D model
called SED4 uses the various sediment loads from the tribu-
taries, the initial bed formation characteristics, and the
hydraulics (2-0 velocity field) to estimate the transport,
scour and deposition in the lagoon,
Net sediment deposition within the Batiquitos Lagoon will be
estimated from changes in bed layer depth versus the total
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loads defined at the boundaries of
will provide information to better
configurations, areas of excessive
the lagoon. These data
assess lagoon design
sediment build-up, and
general estimates of maintenance that may be required.
A prediction of when the lagoon would fill up with sediment,
assuming no control, will be made for use in the EIR/EIS No
Action Alternative. This will be based on sedimentation
rates; no modeling will be done.
The integration of the basin runoff hydrology, sedimentation
characteristics and yield, lagoon hydrodynamics, and pro-
posed control facilities will best address the overall
Sediment Control Plan. The resultant analysis and evalu-
ations will then be used to develop a complete impact
assessment of the proposed Sediment Control Plan including
possible changes.
PRODUCT
The Preliminary Design Report will include the data used to
confirm and develop sediment loading rates for the drainages
to the lagoon, trapping efficiencies for the sediment
control facilities, assumptions, baseline hydrology,
estimated maintenance requirements , and schedules.
In addition, the sediment transport analysis of the Bati-
quitos Lagoon will be included to show the expected nature
of material movement throughout the area. Estimated quan-
tities of sediment build-up or depletion will be shown along
with bottom contours for the design hydrologic condition.
Model assumptions and data will be presented for complete
understanding of the details and limitation of the analysis.
Sediment control traps will be designed for the two creeks
and upland drainage paths. The traps will conform to the
City of Carlsbad and Caltrans standards.
TASK P14--(TASK DELETED)
. TASK PlS--BEACH NOURISRMENT
OBJECTIVES
The objectives of this task are to prepare preliminary
design data for the preferred plan as follows:
o Prepare background information on site-specific
coastal processes to support evaluation of beach
nourishment options.
o Develop optional schemes and compare their rela-
tive merits and demerits.
o Assess possible adverse impacts of the beach nour-
ishment work on the adjacent shorelines.
0 Determine a feasible beach nourishment scheme with
the optimum combination of technical and economic
merits and minimum adverse impacts.
METHODOLOGY
To develop the background information, we will conduct the
following tasks:
o Interview the engineers at the SGbE Encino plant
to assess and reappraise their biannual beach
111-20
nourishment records since 1954 (thus far at least
13 nourishment operations).
0 Interview local and adjacent coastal residents on
factual information on the behavior (namely,
seasonal changes, extreme events) and history of
the beaches.
0 Investigate factual data from literature and ar-
chives on the history of shoreline and beach pro-
file, their changes and equilibrium conditions,
seasonal and extreme events.
Using the background information described above, we will
develop varions schemes for sand placement strategy and will
evaluate innovative concepts which will .enhance the local
residence tine of the placed sand to the maximum possible
extent. The concepts to be evaluated will include: (a) soft-
armor (qeotextile fabric material) mattresses containing
cobbles to serve as stationary permeable underlayer to arrest
the placed sand aqainst wave agitation: (b) "perched" or
terraced beach configuration using retained cobble deploy-
ment with soft-armor technology (i.e., to minimize offshore
loss); (c) horizontal soft-armor retention devices made with
geotextile tailored mattresses containinq cobbles or sand
(i.e., to minimize loncrshore loss); (d) graded cobble dis-
tribution to serve as permeable underlayer for the placed
sand, with no structural retention: (e) "headland" shoreline
concept using redistributed cobble piles with soft-armor
retention. We will conduct the following tasks:
0 Determine volumetric allocation of sand placement
along the shoreline.
11r-21
I
0 Investigate timing and schedule of the nourishment
operations to maximize the project benefits while
minimizing possible adverse impacts.
o Evaluate the useful project life of each alterna-
tive scheme, with and without maintenance.
0 Derive preliminary cost estimates.
All of this information will be used to evaluate and campare
the technical merits and disadvantages of the alternative
schemes.
Potential adverse effects will be assessed, including the
following:
0 The implications of an increased presence of beach
sand on the silting potential at the Ratiquitos
. entrance.
0 The enhanced turbiditv and its spatial distribu-
tion durinu the nourishment operation as a func-
tion of timing, duration, and placement methods.
0 bossible enhancement of sediment “entrainment into
the Aqua Hedionda lagoon.
0 Possible adverse local recreational and aesthetic
impacts .
From this information, we will synthesize the technical mer-
its and impacts of the various schemes and will determine
the best alternative in light of the siqnificance of the
technical merits and adverse impacts, regulatory constraints
and permit requirements, and desires of the City of
Carlshad, the Port of Los Angeles, and the general public.
1x1022
PRODUCTS
The Preliminary Design Report will discuss the various
beach nourishment schemes evaluated, their technical merits,
and their adverse impacts. The report will recommend the
best plan and present reasons for the recommendations.
TASK P16--PRELIMINARY ENGINEERING REPORTS
1. FORTY PERCENT PREDESIGN REPORT
Fifteen copies of a Forty Percent Predesiqn Report will
be delivered to the client. This report will summarize
the results of preliminary investigations and modeling.
The intent of the 40 percent Predesiqn Report is to
allow an early review of initial design concepts and
the overall direction of the project. Consequently,
the report will be terse and will include rough graphic
illustrations.
as tables rather than text.
Much of the material may be presented
The report will cover these topics:
o Results of Initial field work and testing
- Sediment quality by grain size class
- Sediment quality (contaminants found)
- Elutriate test results
- Offshore survey data
111-23
0 Suitable excavation method
0 Dredging depths and boundaries
0 Tidal Inlet
Tidal hydraulics -
- Inlet design options
o Lagoon circulation and flushing (FWA-2 Model-
ing results)
o Lagoon Water Quality (W4?1-4 Modeling results)
0 Resulting habitats
0 Revisions to qrading planlinlet desisn to
improve ha b it a ts
2. PRELIMINARY DESIGN REPORT
Ten copies of a Draft Preliminary Design Report (PDR)
will be submitted for client review.
we will revise the Draft and deliver 20 copies of the
Final PDR.
The PDR will expand the Forty Percent Predesign Report
to include:
0 Results of soil borings
0 Volume of dredged materials by type
0 Dredged materials disposal sites
0 Dredged materials disposal methods
111-24
0 Beach nourishment
o Final grading plan
0
o Sediment traps
0 Cos t estimates
Utilities relocation
TASK' P17--PRELIMINARY ENGINEERING MEETINGS
The consultant will attend and participate in meetinqs and
other meetings during the course of the preliminary enqi-
neering, as requested by the client, up to a total of
16 man-meetings.
include:
It is anticipated that these meetings will
o Two periodic proqress and coordination meetings
with the client to present interim findings.
o One agency meeting to present/discuss the
alternatives and the Forty Percent Predesign
Report.
o Two city council meetinqs; one to present/discuss
the alternatives and the Forty Percent Predesign
Predesign Report,
Report, and one to present a summary J of the
TASK P18--?1ANAGEMENT khfn ADMINISTRATZON
OF PRELIMINARY ENGINEERING
CHZM HILL will provide a Project Director who will be
responsible directly to the client and will manage the
overall activities of the consulting and suhcansulting
staff. He will also be responsible for project
administration,
111-25
Day-to-day engineer,ng tasks will be directed by the lead
engineer.
Management and administration will extend over the 5-month
period of active project work.
TASK PlS--AVIFAUNA SURVEYS
OBJECTIVE
Documen% avifaunal activity within the lagoon.
METHODOLOGY ’
Conduct monthly, l-day field surveys of Batiquitos Laqoon
for five consecutive months.
species numbers and abundance, habitat utilization and acti-
vities of birds present in and immediately adjacent to
Batiquitos Lagoon.
The field surveys will record
PRODUCT
Data compilation will consist of transcribing recorded notes
onto a master species list, with abundance, activity
(e.g., feeding, nesting, resting) and habitat (e.g., open
water, nearshore vegetation, mudflat, etc.) recorded for
each taxon.
BC/001
. 111-26
BATIQlJITOS LAGOON ENHANCEMENT PLAN PREDESIGN
Calendar Days
0
25
45
45
75
(21)
21
SCHEDULE
Milestone
Notice to Proceed (including permitting to open lagoon mouth)
From notice to proceed, completion of
Task P1, laqoon instrumentation to calibrate model
From completion of Task P1 (or from permission to access property, if later), completion of field work and data collection
From completion of previous milestone, submit Fortv-Percent Predesign Report
Completim of client review of Forty Percent
Predesiqn Report
Following receipt of client comments, submit Draft Predesign Report (DPDR)
Client review of DPDR
. Following receipt of client review of DPDR, submit Predesign Report
( ) Numbers in parenthesis desiqnate client review time.
. BC/002
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EXHIBIT 8 SCOPE COST
6ATIQUITOS LAGOON PRELIMINARY ENGINEERING
COST ESTIMATE SIMMARY
FEBRUARY 22, 1987
Task
P1 Lagoon Instrumentation P2 Model Circulation
P3 Model Circulation
- P4 Existing Data
P5 Bathymetric Survey
P6 Soils Analysis *
P7 Tidal Inlet
P8 Water Quality
P9 Environmental
P10 Mapping
P11 Dredging
P12 Gasline P13 Sediments
P15 Beach Nourishment
P16 Engineering P17 Meetings
P18 Administration
P19 Avifauma
- Fee -
$37,000 42,000
26,000 6,000
12,000
44,000
43,500
22,000 4,000
10,000 30, 000
4,200
41,000
29, OOO
16,000 10,000
10,000 5,500
AL: $392,200
Approx.
Days to Finish
30 180
180 30 30
60
200
200
45
100
200
270
200
260 230
270 130
270
im
-