HomeMy WebLinkAboutLos Angeles, City of / Bd of Harbor Commissioners; 1987-04-08; 1419% uuK DEPARTMENT
REIMBURSEMENT AGREEMENT 0
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l T REIMBURSEMENT AGREEMENT BETWEEN THE CITY 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 day of , 1987, between the CITY OF CARLSBAD, a municipal corporation of California, hereinafter referred to as CITY, and the City of 10s Angeles acting by and through the Board of Harbor Commissioners hereinafter referred to as BOARD.
RE C I TAL S
WHEREAS, BOARD and 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 (EIR) and Environmental Impact Statement (EIS) ; and
WHEREAS, in order to adequately scope the EIR/EIS and to determine whether the 1 agoon enhancement project is feasible, prel iminary 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
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, in consideration of the covenants and conditions, it is agreed as fol lows:
1. CITY will engage the firm of CH2M Hill hereinafter referred to as CONSULTANT to perform the necessary prel imi nary engineering for that area more particularly depicted upon a site map attached as Exhibit "A" - Batiquitos Lagoon Enhancement Plan.
It is understood that CONSULTANT'S services shall conform to the eighteen tasks specified in the Scope of Work attached as Exhibit B and made a part of this agreement. To carry out these tasks, Consultant shall :
(a) Conduct field explorations;
(b)
(c) Write reports; and
(d)
2.
Communicate weekly with the CITY staff;
Perform such other work as necessary to properly evaluate the proposed Project.
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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.
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.
contractor of CITY.
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.
prel iminary 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.
P
T
Separate agreements may be entered into by
5. It is understood that CONSULTANT shall be an independent
6.
7. It is understood that, since BOARD is advancing funds for
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.
P CITY and BOARD agree that the plans developed by
T
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.
Y
CITY OF CARLSBAD, a Municipal
Corporation of the State of Cal i fornia
BY
CITY OF LOS ANGELES, a Municipal
Corporation of the State of
California
ATTEST:
APPROVED AS TO FORM: APPROVED AS TO FORM:
BY
Assistant City Attorney Assistant
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EXHIBIT I I- e 0
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1 111. SCOPE OF WORK
CH2M HILL
BATIQUITOS LAGOON ENHANCEMENT PLAN PREDESIGN
Revised August 13, 1986
Revised February 5, 1987
Revised February 18, 1987
Revised February 22, 1987
TASK Pl--LAGOON INSTRUMENTATION TO CALIBRATE MODEL
OBJECTIVE
Determine the water levels and current speeds and directioi
in each of the three Batiquitos Lagoon basins under the
influence of real ocean tides and to ascertain the frictioi
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 t
the three basins for 10 days. A cross-section at the open'
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 t
Tabulation of tides, water levels, current speeds and
directions as a function of time to be used as input into
RMA2.
TASK P2:-MODEL CIRCULATION OF PREFERRED ALTERNATIVE
OBJECTIVE
Using water elevation records and current data from the
lagoon 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 assum
implementation of the preferred alternative.
METHODOLOGY
The hydraulic analysis will be done using the Corps of En
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 (Pla
The results will be compared to the established goal and
objectives for compliance.
PRODUCTS
A calibrated hydrodynamic model of Batiquitos Lagoon and
series of maps (figures) showing circulation patterns in
Batiquitos Lagoon for the Preferred Alternative. Also,
input data for RMA4 will be generated.
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i TASK P3--MODEL CIRCULATION OF TWO DEVELOPMENT OPTIONS
OBJECTIVE
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
and 3 will be developed and modeled. RMA2 will be run to
evaluate circulation, mixing, flushing, and tidal prism
propagation in the lagoon. The results will-be compared t
the project goals and objectives for compliance.
PRODUCT
A series of maps (figures) showing circulation patterns ir
Batiquitos Lagoon and input data for RMA4 will be generate
for Plans 2 and 3.
TASK P4--EXISTfNG DATA
OBJECTIVE
Obtain all pertinent information and data on Batiquitos
Lagoon to assist in engineering design aspects and preveni
duplication of study efforts.
METHODOLOGY
Existinq data will be gathered on such items as:
0 Bridge plans from CalTrans
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k Contour maps of lagoon
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0 Bench mark identification and horizontal and ve
tical coordinates
o Right-of-way surveys
0 Easements
o Upland erosion and sedimentation rates
o Plans for existing utilities and gas line
o Test holes data from bridge investigations and
other studies
0 Stream flow hydrographs
0 Tide and tidal current data
0 Littoral drift
0 Previous modelling efforts
0 Previous beach profiles
0 Traffic counts and traffic patterns
0 Noise measurements
o Dredging records of other California tidal inlt
o Air quality analyses
o 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. Copies of the data will be assembled and sen
to project engineers and preparers of the EIR/EIS.
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 pla
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,
generated for the unmapped sections of the lagoon.
PRODUCT
Bathymetric records will be reduced and contou
A contour map at l"=lOO' scale, with I-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 t
question of whether the soils in the east end of the lagoo
are contaminated with pesticide residues or toxic material
identified in'the testing described below, The informatio
resulting from the analysis may be used to apply for permi
for dredging, Section 404 inwater disposal, and ocean dump
METHODOLOGY
Soils conditions in the western portions of the lagoon hav
been evaluated for structural purposes to some extent, but
soils in the eastern portion require additional sampling a
mechanical analyses. There appear to be anomalies in the
lagoon depositions, which will require analysis sufficient
for engineering dredging and disposal, grading designs, co
estimating, and structural uses on- and offsite. No chemi
ea1 testing of soils has been done, We have not had acces
to any of the boring logs or test results from previous
sampling efforts: therefore, our proposed samplingltesting
effort contains a degree of uncertainty.
From a recent conversation with a representative of the
Corps of Engineers, South Coast District, it appears than
accurate estimate of bioassay/bioaccumulation studies nece
sary for the Enhancement Plan design cannot be made withou
knowledge of the chemical characteristics of the lagoon
sediments. For ocean disposal, the Corps requires bioassa
on three particular species (zooplankton and invertebrates
in both the solid phase and the liquid phase. According t
the Corps representative, a proposed bioassay program must
be submitted to the Corps for approval: the proposed progr
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i should be based on knowledge of the sediment chemical cha
acteristics. Our proposed chemical sampling program will
provide enough information to develop a bioassay program
Corps approval. However, a bioassay is not included in t
scope.
Sampling for potential contamination and permitting purpo
will be required. Possible contamination from offsite ac
ities has been raised as a concern, due to agriculture an1
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,, w
there be limitations to disposal siting),
There will be soil samples taken from five locations for
chemical and physical sampling, and 20 locations for phys
sampling throughout the lagoon. Samples will be taken wi
either hand-driven coring or float mounted vibra-core equ
ment.
mudline of 10 feet, or an elevation of -8 feet (MSL).
The samples for the chemical testing will be taken adjace<
to the creek mouths and the nursery area and at certain
drainage points around the lagoon, Samples will be compo
and undergo elutriate tests for the following: metals, c'
nide, total phenol, acid extractables, base/neutral extra(
ables, pesticides/PCB's, chlorophenoxy herbicides, and
volatiles. In addition, each will undergo a bulk sedimen.
analysis to meet the Corps of Engineers criteria.
sampling program is designed to resolve the issue of cont
nated soils and to provide the information necessary for
dredging permits and development of a bioassay program fo
Corps approval, A two-page summary of the methods proposc
will be submitted to the client for their coordination wi
EPA and the Corps of Engineers.
Each hole will be cored to a maximum depth below
The
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t Twenty test holes will be cored for determination of physi
characteristics of the proposed dredged material. Samples
taken would be subjected to laboratory classification
(including grain size analysis).
throughout the lagoon and we propose using coring equipmen
as mentioned above.
placed into plastic jars for grain size laboratory analysi
CH2M HILL will conduct both the sampling and the laborator
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,
The cores will be from
Samples from each test hole will be
Oregon.
Any permits required and/or access permission needed will
acquired or arranged by the client.
PRODUCT
Results of soil sampling and testing will be included in i
Forty Percent Predesign Report.
boring logs, and physical and chemical laboratory test re-
sults will be included in the Preliminary Design Report.
Maps of test hole sites,
TASK P7--TIDAL INLET ANALYSIS
AND PRELIMINARY DESIGN
OBJECTIVE
The purpose of this task is to develop the preliminary de
of a self-maintaining tidal entrance to the Batiquitos La
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< METHODOLOGY
This task will be performed in the following manner:
o Collect and analyze current and historical data
the physical and geological processes relating
the lagoon outlet and its adjacent coastal and
nearshore region. Relevant literature will a-Is
be reviewed including the Coastal Conservancy's
Enhancement Plan, the previous reports by the
Scripps Institution of Oceanography, comments b
Waterways Experiment Station (WES) and local
interests.
0 Perform a bathymetric and sub-bottom profile su
of the offshore sea bed surrounding the lagoon
outlet in order to obtain high-resolution infor
tion of the site-specific boundary condition in
support of the entrance design. A total of sev
survey transects will be deployed within 300 fe
upcoast and downcoast of the outlet, extending
a depth of 30 feet.
0 Perform a conceptual, functional design of the
tidal entrance. The design will be accompanied
the supporting rationales as well as estimates
silting rates in the lagoon and closure frequer
in consideration of tidal fluctuations, storm
frequencies and regional coastal sediment budge
0 Perform a preliminary, structural design of the
tidal entrance, accompanied by the provisions !
jetties or no jetties, channel dimensions and
configurations, specification or armor types fc
the channel and the jetty, and preliminary des:
drawings.
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o Analyze potential impacts of the proposed entrz
design, with special reference to possible disz
tion to the longshore sediment transport, and a
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, constructi
scenarios, schedules, and costs, and provide pr
liminary estimates and specs on labor, material
and -equipment.
o Develop maintenance methodologies, schedules an
costs.
PRODUCTS
The Preliminary Design Report will summarize the rational
the preliminary design, the construction methods, the est
mated costs for construction and maintenance, and the mai
tenance procedures.
TASX P8--WATER QUALITY ANALYSIS
OBJECTIVE
The purpose of this task is to examine how the lagoon cir.
culation of the preferred alternative affects water quali.
specifically salinity and temperature. The hydrodynamic
analysis is assumed to provide sufficient circulation dati
for water quality assessment in the lagoon on a seasonal
basis.
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METHODOLOGY
The sensitivity of the preferred alternative lagoon confic
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
each of four seasonal conditions. Seasonal projections a.
necessary due' to the physical, habitat, environmental, anc
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 s
ond Corps model (also two-dimensional) called RMA-4, whic
models water quality. With WA-4, we can model dissolved
oxygen, temperature, biological oxygen demand, and salini
in the lagoon as&ming a purely advection-dispersion mass
transport without detailed kinetic relationship. RMA-4 h
the potential to handle one or two conservative substance
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 co
ditions, circulation patterns, and runoff water quality i
integrated into the water quality analysis. We will perm
examination the seasonal variations of water quality.
Existing data and analytical techniques will be utilized
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
summarized in the Preliminary Design Report complete with
data, assumptions, methods, results, and conclusions.
The product will include a recommendation and/or confinna-
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 reevaluati
of lagoon operations in the future.
I
TASK Pg--PRELIMINARY ENVIRONMENTAL REVIEW
OBJECTIVE
The objective is to review early design concepts to
determine if the resulting enhancement project will providl
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 0.
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 the:
meet the criteria for fisheries and bird habitat. If
necessary, the biologists suggest modifications which can 1
used to refine the grading plan and remodel circulation an{
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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s PRODUCT
Minor adjustments will be made in design concepts to bett
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 to be dredged.
METHODOLOGY
Topography for the existing lagoon, the recommended
(preferred) plan and one alternative, will be digitized
using CADD,
with 1-foot contour intervals in the areas to be dredged.
Topographic and bathymetric data collected under the fathc
eter survey task will be digitized to complete the existi]
condition and preferred-plan maps. Volume differences wi:
be computed.
Maps will be prepared at a scale of 1"=100'
PRODUCT
Three contour maps will be produced,
will be summarized in the Preliminary Design Report.
The dredge volumes
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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 SUI
tidai habitat, 170 acres of intertidal habitat,
and 135 acres of supertidal habitat.
An alternative dredging plan to the one above. o
o A plan, schedule, and cost estimate to properly
dispose of approximately 3 million cubic yards 01
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
any contaminated sediments are present. If contaminants a!
present, those areas will be delineated for special handlii
procedures. This could include locating approved disposal
sitets), 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 homogeneoi
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. Proper sizes and types of dredging equipment will
be identified; work capacities estimated, handling require
ments catalogued, and costs estimated, Adequate dredging
schemes and techniques will be documented,
A set of dredging plans (contours and/or slope grades) wil
be drawn up for each of the alternatives using our CADD sy
tem. The dredging plans will be compared to the existing
ground contours and dredging quantities computed.
The amount and character of sediments to be removed will bc
reviewed to schedule when and from what part of the lagoon
the different soil types will be removed. Sa'nd will be ea
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 identifil
and tagged as to haul method and destination, a schedule (
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 1
receive the material.
Habitat requirements of the least tern will be supplied by
the client. Provisions for protection of least tern nestii
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 t
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 plan
ing the disposal site(s), marking and/or fencing the
disposal site(s), renting the disposal site(s) for a numbe
of years, or turning the disposal site(s) into special hak
tats) .
Beach nourishment as a means of disposal is discussed elsc
where.
PRODUCTS
A set of preliminary dredging plans consisting of new con-
tours (dark) for each of the preferred plan and Phase X
superimposed on the existing contours (screened). A dredg
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 P12--GAS LINE RELOCATION
OBJECTIVE
At least one gas line is known to cross the lagoon and wi
require relocation. The existing line will be located an(
relocation scheme developed.
METHODOLOGY
The Southern Cities Gas Company will be queried as to the
exact location of their gas pipeline across Batiquitas
Lagoon,
with Southern Cities Gas Company and Caltrans, and a pre-
ferred relocation scheme selected. Conceptual drawings o
the preferred relocation scheme will be prepared.
Relocation schemes will be developed, discussed
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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 will be to examine and evaluate tk
proposed sediment control plan and to integrate the resul-
tant net sedimentation to the Batiquitos Laqoon with a sedj
ment transport model of the lagoon. This will be performec
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 drainag
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. T
design storm used will be the one anticipated to yield the
greatest sediment deposition,
Grain size distributions of both suspended sediment data i
bed material data in the study area will be used to estim:
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 sedimen
basin performance will be required to confirm the sedimen
yield to the lagoon, both suspended and bed material.
Estimates of suspended sediment concentrations and loads
will be made ‘from available data. The silt and clay laye
in the bottom sediments of the present lagoon suggest a
substantial fraction of the net sediment yield to the lag(
is suspended sediments. This suspended material is not
easily trapped.
Major percentages of the total sediment yield to the site
are probably carried during high runoff events. These st
conditions are usually accompanied by high waves and tide
along the coast. Both of these conditions are linked
together through the inlet hydraulics and conditions at t
boundary of the lagoon.
The potential for the lagoon to transport, circulate, sco
and deposit these sediment materials will be examined by
coupling the estimated sediment loads with the hydrodynam
of the Lagoon.
As noted, the hydraulic analysis of the Preferred Plan an
alternatives will be done using the Corps model RMA-2. T
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 trib
taries, the initial bed formation characteristics, and th
hydraulics (2-D velocity field) to estimate the transport
scour and deposition in the lagoon.
Net sediment deposition within the Batiquitos Lagoon will
estimated from changes in bed layer depth versus the tota
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loads defined at the boundaries of the lagoon. These data
will provide information to better assess lagoon design
configurations, areas of excessive sediment build-up, and
general estimates of maintenance that may be required.
A prediction of when the lagoon would fill up with sedimen
assuming no control, will be made for use in the EIR/EIS N
Action Alternative. This will be based on sedimentation
rates: no modeling will be done.
The integration of the basin runoff hydrology, sedimentati
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 includinc
possible changes.
PRODUCT
The Preliminary Design Report will include the data used
confirm and develop sediment loading rates for the drainat
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 natur
of material movement throughout the area. Estimated quan
tities of sediment build-up or depletion will be shown a1
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 analys
Sediment control traps will be designed for the two creek
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and upland drainage paths.
City of Carlsbad and Caltrans standards.
The traps will conform to the
TASK P14- (TASK DELETED)
- TASK P15--BEACH NOURISHMENT
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 beact
nourishment options.
Develop optional schemes and compare their rela-
tive merits and demerits.
o
o Assess possible adverse impacts of the beach no1
ishment work on the adjacent shorelines.
o Determine a feasible beach nourishment scheme w
the optimum combination of technical and econom
merits and minimum adverse impacts.
METHODOLOGY
To develop the background information, we will conduct th
followinq tasks:
o Interview the engineers at the SG&E Encino plan
to assess and reappraise their biannual beach
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nourishment records since 1954 (thus far at leas1
13 nourishment operations).
0 Interview local and adjacent coastal residents 01
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 various schemes for sand placement strategy and wi
evaluate innovative concepts which will .enhance the local
residence time of the placed sand to the maximum possible
extent. The concepts to be evaluated will include: (a) s
armor (qeotextile fabric material) mattresses containing
cobbles to serve as stationary permeable underlayer to arr
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 offshor
loss); (c) horizontal soft-armor retention devices made wi
geotextile tailored mattresses containinq cobbles or sand
(i.e., to minimize lonsshore loss): (d) graded cobble dis-
tribution to serve as permeable underlayer for the placed
sand, with no structural retention; (e) "headland" shore11
concept using redistributed cobble piles with soft-armor
retention. We will conduct the following tasks:
0 Determine volumetric allocation of sand placemei
along the shoreline.
. 111-21
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0 Investigate timing and schedule of the nourish
operations to maximize the project benefits whi
minimizing possible adverse impacts.
0 Evaluate the useful project life of each altern
tive scheme, with and without maintenance,
0 Derive preliminary cost estimates.
All of this information will be used to evaluate and comp
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 be
sand on the silting potential at the Ratiquitos
. entrance.
0 The enhanced turbiditv and its spatial distribt
tion durinu the nourishment operation as a func
tion of timing, duration, and placement methods
i
0 Possible enhancement of sediment entrainment ir
the Aqua Hedionda lagoon.
0 Possible adverse local recreational and aesthel
impacts.
From this information, we will synthesize the technical r
its and impacts of the various schemes anti will determinc
the best alternative in light of the siqnificance of the
technical merits and adverse impacts, regulatory constra:
and permit requirements, and desires of the City of
Carlshad, the Port of Los Angeles, and the general public
111-22
.L* e e
PRODUCTS
The Preliminary Design Report will discuss the various
beach nourishment schemes evaluated, their technical merit!
and their adverse impacts.
best plan and present reasons for the recommendations.
The report will recommend the
TASK P16--PRELIMINARY ENGINEERING REPORTS
1. FORTY PERCENT PRYDESIGN REPORT
Fifteen copies of a Forty Percent Predesiqn Report wi
be delivered to the client. This report will summari
the results of preliminary investigations and modelin
The intent of the 40 percent Predesign 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 graph
illustrations. Much of the material may be presented
as tables rather than text.
The report will cover these topics:
0 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 a
\
0 Suitable excavation method
0 Dredging depths and boundaries
0 Tidal Inlet
- Tidal hydraulics --
- - Inlet design options
o Lagoon circulation and flushing (RMA-2 Mod(
ing results)
o Lagoon Water Quality (WA-4 Modeling resulf
0 Resulting habitats
0 Revisions to qradinq planlinlet desisn to
improve habitats
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 Predesiqn Repor
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
e 0
\
0 Beach nourishment
0 Final grading plan
0 Utilities relocation
0 Sediment traps
0 Cost estimates
TASK- P17--PRELIMINARY ENGINEERING MEETINGS
The consultant will attend and participate in meetings anc
other meetings during the course of the preliminary engi-
neering, as requested by the client, up to a total of
16 man-meetings. It is anticipated that these meetings w
include :
0 Two periodic proqress and coordination meetings
with the client to present interim findings.
0 One agency mee%ing to present/discuss the
alternatives and the Forty Percent Predesiqn
Report.
0 Two city council meetinqs; one to present/discu
the alternatives and the Forty Percent Predesig
Report, and one to present a summary of the
Predesiqn Report.
TASK P18--?IANAGEMENT AND ADMINISTFWTION
OF PRELIMINARY ENGINEERING
CHZM HILL will provide a Project Director who will be
responsible directlv to the client and will manage the
overall activities of the consulting and subconsulting
staff. He will also be responsible for project
administration.
111-25
LC 0 0
\ Day-to-day engineering tasks will be directed by the lead
engineer.
Management and administration will extend over the 5-month
period of active project work.
- TASK P19--AVIFAUNA SURVEYS
, OBJECTIVE
Document avifaunal activity within the lagoon.
METHODOLOGY
Conduct monthly, l-day field surveys of Batiquitos Lagoon
for five consecutive months. The field surveys will recorc
species numbers and abundance, habitat utilization and act
vities of birds present in and immediately adjacent to
Batiquitos Lagoon.
PRODUCT
Data compilation will consist of transcribing recorded notc
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
0 0
t .
BATIQIJITOS LAGOON ENHANCEMENT PLAN PREDESIGN
SCHEDULE
Calendar Days Milestone
0 Notice to Proceed (including permitting tc
open lagoon mouth)
25 From notice to proceed, completion of
Task P1, laqoon instrumentation to calibr-
model
45 From completion of Task P1 (or from
permission to access property, if later),
completion of field work and data collect
45 From completion of previous milestone, su
Fortv-Percent Predesign Report
(21) Completim of client review of Forty Perc
45 Following receipt of client comments, sub
Predesign Report
Draft Predesign Report (DPDR)
(21) Client review of DPDR
21 Following receipt of client review of DPD
submit Predesign Report
( ) Numbers in parenthesis designate client review time
BC/OO2
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EXHIBIT B
SCOPE COST
BATIQUITOS LAGOON PRELIMINARY ENGINEERING
COST ESTIMATE SJMMARY FEBRUARY 22, 1987
Appr ox.
Days to Fee Finish - Task
P1 Lagoon Instrumentation $37,000 30 P2 Model Circulation 42,000 180 P3 Model Circulation 26,000 180 . - P4 Existing Data 6,000 30 P5 Bathymetric Survey 12,000 30 P6 Soils Analysis 44,000 60
-
P7 Tidal Inlet 43,500 200
P8 Water Quality 22,000 200
P10 Mapping 10,000 45 P11 Dredging 30,000 100 P12 Gasline 4,200 200
P15 Beach Nourishment 29,000 200
P9 Environmental 4,000 1 90
P13 Sediments 41,000 270
P16 Engineering 16,000 260
P17 Meetings 10,000 230
P18 Administration 10,000 270
130 PI9 Avifauma 5,500
AL: $392,200 270
-