HomeMy WebLinkAbout19594 ORD - 12/30/1986AN ORDINANCE
AUTHORIZING THE EXECUTION OF AN AGREEMENT WITH THE UNITED
STATES GEOLOGICAL SURVEY FOR A SEDIMENTATION STUDY OF LAKE
CORPUS CHRISTI; AND DECLARING AN EMERGENCY.
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF CORPUS CHRISTI,
TEXAS:
SECTION 1. That the City Manager is hereby authorized to execute an
agreement with the United States Geological Survey, Department of the Interior,
for a sedimentation study of Lake Corpus Christi, with the City's contribution
to be $145,307.40, and with other material provisions to be substantially as set
forth in the attached Exhibit "A."
SECTION 2. That upon written request of the Mayor or five Council
members, copy attached, to find and declare an emergency due to the need of
executing the abovementioned agreement at the earliest practicable date, such
finding of an emergency is made and declared requiring suspension of the Charter
rule as to consideration and voting upon ordinances or resolutions at three
regular meetings so that this ordinance is passed and shall talo effect upon
fir_
first reading as an emergency measure this the 30 day of
�Gein19 0
ATTEST:
—7dw'r-9
City Secretary MAYOR
APPROVED: a O DAY OF fi2c c9...d.vr-, 19 8--C
HAL GEORGE, CITY ATTORNEY
By
Ass" int City Attorney
01P.01O.01
THE CI Y OF CORPUS CHRISTI, TEXAS
19594 MICROFILMED
REQUEST FOR PROPOSAL
TO CONDUCT
SEDIMENTATION SURVEY
LAKE CORPUS CHRISTI
PROPOSE: To survey Lake Corpus Christi to determine the extent to which
sedimetation has reduced water storage capacity, to produce
area/capacity curves, and provide an appropriate report on the
findings.
SCOPE:
A. Conduct a field survey, of the entire lake•and Nueces River
to the northern point where Gildon Creek enters the Nueces River,
by continuous acoustical profiling, with boat location monitored
by a two or three -station radio location -finding apparatus.
B. Produce approximately 150 miles of cross-sections and
profiles to insure adequate coverage of the entire area. Make a
permanent record of the soundings and profiles and preserve for
future reference.
C. Update the Base Map prepared by McCaughan & Etheridge in
1972, to show the current lake outline at elevation 94.0' M.S.L.
and show the current bottom contours in relation to the 1972
contours.
D. Research the records of the Texas Water Development Board and
other agencies on sediment transport records since 1972 to see if
the findings correlate to the survey, and, if possible from the
available data make a prediction on the rate of sedimentation in
the future.
E. By calculations and actual field data, produce area -capacity
curves at 0.5' intervals to show current conditions as of the
date of the survey, down to elevation 60.0' M.S.L.
F. If possible, from current data and river conditions permit,
locate the point on the Nueces River where the bottom of the
river intersects the 94.0' M.S.L. plane, which is the northern-
most boundary of Lake Corpus Christi as recognized by the State
of Texas. The location should be marked with a permanent
monument.
CONDITIONS: It is desired that the actual field survey be conducted when the
lake is as near elevation 94.0' M.S.L. as possible. However, if
it becomes apparent that these conditions might not exist in the
foreseeable future then the USGS will consult with the City and
recommend a course of action.
DATA:
All current lake data, history and the 1972 Sedimentation Survey
conducted by McCaughan & Etheridge will be provided to the USGS
to assist in conducting the survey.
1
PROPOSAL: It is assumed that the USGS will provide all personnel, boats and
equipment to complete the proposed survey on a reimbursable
basis, with only incidental assistance provided by the City. It
is requested that USGS provide an estimate of the cost of the
survey on that basis.
2
Department of the Interior
U.S. Geological Survey
Joint Funding Agreement
FOR
THIS AGREEMENT is entered into as of the day of , 1986, by the
CITY OF CORPUS CHRISTI, STATE OF TEXAS, party of the first part, and the
GEOLOGICAL SURVEY, UNITED STATES DEPARTMENT OF THE INTERIOR, party of the
second part.
1. The parties hereto agree that subject to the availability of
appropriations and in accordance with their respective authorities there shall
be maintained in cooperation in a Sedimentation Survey of Lake Corpus Christi,
State of Texas, hereinafter called the program.
2. The following amounts shall be contributed to cover all of the cost of the
necessary field and office work directly related to this program, but
excluding any general administrative or accounting work in the office of
either party. The field and office work and costs found in the attached Work
and Cost Statements, which is attached hereto and executed by the parties to
this agreement, are hereby incorporated in this contract and made a part
hereof.
(a) From city of Corpus Christi
$145,307.40 by the party of the first part during the period
Oct. 15, 1986 to July 31, 1987.
(b) $29,181.00 by the party of the second part during the period
Oct. 15, 1986 to March 31, 1987.
(c) Additional amounts by each party during the above period or
succeeding periods as may be determined by mutual agreement and set
forth in an exchange of letters between the parties.
3. Expenses incurred in the performance of this program may be paid by either
party in conformity with the laws and regulations respectively governing each
party, provided that so far as may be mutually agreeable all expenses shall be
paid in the first instance by the party of the second part with appropriate
reimbursement thereafter by the party of the first part. Payments to the
party of the second part by the party of the first part will be made quarterly
upon billing by the party of the second part or immediately upon signature.
Each party shall furnish to the other party such statements or reports of
expenditures as may be needed to satisfy fiscal requirements.
4. The field and office work pertaining to this program shall be under the
direction of or subject to periodic review by an authorized representative of
the party of the second part.
5. The areas to be included in the program shall be determined by mutual
agreement between the parties hereto or their authorized representatives. The
methods employed in the field and office shall be those adopted by the party
of the second part to insure the required standards of accuracy subject to
modification by mutual agreement.
1
6. During the progress of the work all operations of either party pertaining
to this program shall be open to the inspection of the other party, and if the
work is not being carried on in a mutually satisfactory manner, either party
may terminate this agreement upon 60 days written notice to the other party.
7. The original records resulting from this program shall be deposited
ultimately in the office of the party of the first part and become part of the
records of that office. Copies shall be furnished to the party of the second
part upon request.
8. The maps, records, or reports resulting from this program shall be made
available to the public as promptly as possible. The maps, records or reports
normally will be published by the party of the second part. However, the
party of the first part reserves the right to publish the results of this
program and, if already published by the party of the second part shall, upon
request, be furnished by the party of the second part, at cost, impressions
suitable for purposes of reproduction similar to that for which the original
copy was prepared. The maps, records or reports published by either party
shall contain a statement of the cooperative relations between the parties.
GEOLOGICAL SURVEY
UNITED STATES
DEPARTMENT OF THE INTERIOR
By
ATTEST: CITY OF CORPUS CHRISTI
By
Armando Chapa Craig A. McDowell
City Secretary City Manager
APPROVED: DAY OF" , 19
HAT• GEORGE, CITY ATTORNEY
By By
Jimmy Bray James K. Lontos
Assistant City Attorney Assistant City Manager
2
SEDIMENTATION SURVEY, LAKE CORPUS CHRISTI
Work Statement
Introduction
Lake Corpus Christi is formed by the Wesley Seale Dam across the Nueces River
in south Texas (fig. 1). Lake Corpus Christi is owned by the Lower Nueces
River Water Supply District and is operated by the City of Corpus Christi.
However, effective August 1, 1986, ownership of the lake and dam will be
transferred to the City of Corpus Christi as a result of legislation passed by
the Texas Senate and House of Representatives and signed by Governor White.
Municipal and industrial water supplies for Corpus Christi and several
smaller, adjacent cities of the Coastal Bend come principally from Lake Corpus
Christi and, in lesser amounts, from water wells. From 1948 until 1982,
drainage from the Nueces River and two tributaries, the Frio River and the
Atascosa River, flowed into Lake Corpus Christi (fig. 1). In 1982, the Choke
Canyon Dam was completed on the Frio River upstream from Lake Corpus Christi,
thereby limiting the inflow from this tributary into the Nueces River.
Water usage from the Choke Canyon Lake cannot begin until there has been a
significant accumulation in the reservoir, which may be a few years in the
future, depending on rainfall in the Frio River watershed.
Water demands placed on Lake Corpus Christi are rapidly approaching its annual
dependable yield. Also, the water storage capacity of Lake Corpus Christi is
being reduced by sediment deposition. The amount of sediment deposited
through 1972 is reported in a sedimentation study for the City of Corpus
Christi by McCaughan and Etheridge Consulting Engineers, with the assistance
of Southwest Research Institute. Similar information is needed for the period
1972-1985. Consequently, the Water Division, Department of Public Utilities,
City of Corpus Christi, has requested the U.S. Geological Survey (USGS) to
conduct a sedimentation survey of the lake. For the purpose of the USGS
survey, the northern -most boundary of Lake Corpus Christi, which is also the
boundary recognized by the State of Texas, is the point where the bottom of
the Nueces River intersects the 94.0 foot M.S.L. (mean sea level) plane.
Objectives
The USGS proposes to conduct a sedimentation study of Lake Corpus Christi to
accomplish a set of objectives outlined by the Water Division. These
objectives are: (1) to determine the extent to which sedimentation has
reduced water storage capacity; (2) to produce area/water capacity curves;
and, (3) to provide a report on the results of the study.
The field survey will be conducted when the water level in Lake Corpus Christi
is as near to 94.0 feet M.S.L. as possible. However, if it becomes apparent
that these conditions might not exist in the foreseeable future, then the USGS
will consult with the appropriate Water Division officials to determine a
course of action.
1
Figure 1. Map showing Lake Corpus Christi — Choke Canyon
Lake areas and outline of aerial photography area.
USGS Program
The USGS program has six elements that are designed to achieve the objectives
of the Water Division.
1. Lower Lake Corpus Christi sedimentation survey
(a) A data collection survey will be made to lower Lake Corpus Christi
from the Wesley Seale Dam to where Gildon Creek enters the Nueces
River (fig. 1), or to the northernmost point navigable by the survey
vessels..
(b) Navigation and surface locations for the survey will be provided by
land survey, transit satellite receivers, GPS satellite receivers or
radio frequency tri-lateration systems to insure complete coverage
of the lake and river areas.
(c) Laboratory and field calibration will be performed on all bathymetry
and navigational equipment before data collection begins. Bar
checks of the bathymetry equipment will be made on a daily basis to
insure accurate depth measurements.
(d) Bathymetric, navigational, and seismic profiling data will be
collected along lines in a grid over the lake and river area,
wherever possible. Survey lines will be spaced 1,000 feet apart on
the lower part of the lake below a line from Indian Point to Sleepy
Hollow (fig. 1). On the northern part of the lake, the data line
spacing will be 2,000 feet apart. A minimum of 150 line miles of
data will be collected. Shallow water depths and submerged
vegetation may restrict boat movement and data collection in some
areas. On the northern part of the lake, on the Nueces River, and
in small coves, data will be collected on single or zig-zig lines
because of limited space for maneuvering the survey vessels.
(e) Subject to availability, the data acquisition and processing
equipment to be used for the survey are:
GPS satellite receivers
Transit satellite receivers
Maxiran positioning system
Integrated data acquisition system - operating at 500 kHz, will
provide accurate bathymetry measurements
Datasonics subbottom profiler - operating at dual frequencies of
200 kHz and 12 kHz, should provide measurements on sediment fill
EPC graphic recorder
The Datasonics subbottom profiler and EPC Recorder will be mounted on a large
boat that will also serve as an observation vessel for a smaller boat that
will survey the very shallow and remote areas that would be inaccessible with
the larger boat.
2. Upper Lake Corpus Christi - Nueces River survey
Data will be collected on the Nueces River northward of the entrance of Gildon
Creek, provided river currents and conditions permit, to determine the
geographic location of the northern boundary of Lake Corpus Christi. Data
3
acquisition equipment and procedures, as previously described, will also be
used in this phase, except that data will be collected in straight or zig-zag
lines because of the narrow width of the river.
3. Data processing
Datasonics subbottom soundings with 200 kHz and 12 kHz signals should provide
measurements of the top of the sediment fill and the top of the pre -lake
surface, respectively. These data soundings will be played back into seismic
profiles over at least 150 line miles of coverage. Cross sections will also
be constructed in the areas of the lake where there is significant sediment
fill. The Datasonic soundings, seismic profiles and cross sections will be
preserved for future references.
4. Maps
(a) An aerial photographic survey will be flown by a contract company to
provide photographic coverage of the area from below Wesley Seale
Dam to the east end of Choke Canyon Lake (fig. 1). This area of
photographic coverage will include the northern -most point of Lake
Corpus Christi, where the bottom of the Nueces River intersects the
94.0 foot M.S.L. plane, which has never been mapped and the
confluences of the Frio, Atascosa, and Nueces Rivers. Photographic
mosaics of the lower and upper lake will be developed to serve as
horizontal control in preparing maps and for use in establishing
surface elevations.
(b) The base map prepared by McCaughan & Etheridge in 1972 will be
revised to show (a) the current lake outline at 94.0 feet M.S.L.
and (b) the current bottom contours relative to the 1972 contours.
(c)
A map of Lake Corpus Christi will also be constructed showing, where
possible, the areas and the amounts of sediment fill on the pre -lake
surface.
5. Rate of sedimentation
The amounts of suspended sediments transported into and out of Lake Corpus
Christi (monthly, yearly, and 1972-1985 water years) will be computed or
estimated from available data to determine or to estimate the sediment
deposition in the reservoir. The rate of future sedimentation in Lake Corpus
Christi will be predicted, if possible, on the bases of flow -duration data.
Sediments transport records of the Texas Water Development Board and USGS will
be compiled on five stations. These five stations are: (1) Frio River,
Calliham Station; (2) Nueces River, Cotulla Station; (3) Atascosa River,
Whitsett Station; (4) Nueces River, Three Rivers Station; and, (5) Nueces
River, Mathis Station.
These data will be analyzed and will be used to define historical relations
between streamflow and suspended sediment transport. Future sedimentation
rates will be estimated from monthly flow duration data. The median flow
value for each month will be used to estimate monthly suspended sediment loads
at appropriate locations. The resulting relations and regression equations
4
will be used to estimate monthly, annual, and 1972-1985 period suspended
sediment transport into and out of Lake Corpus Christi.
Sediment deposition in Lake Corpus Christi will be estimated by determining
the difference between inflow and outflow suspended sediments. No attempt
will be made to include those sediments which may be transported along the
river bottom and which are commonly called "bedload sediments".
Tables will be prepared summarizing monthly, annual, and 1972-1985 period of
sediment transport into and from Lake Corpus Christi. Supporting figures,
including curves showing relationships between streamflow and sediment
concentration, will be plotted. An estimate of the future sedimentation rate
will be prepared, based on regressions and on historical flow—duration data.
6. Area/water capacity curves
Area/water capacity curves will be calculated at 1.0 foot intervals from
actual field data to show the current conditions as of the date of the survey
down to an elevation of 60.0 feet M.S.L.
Final report
The USGS will submit a final report to the Water Division within six months of
completion of the data acquisition. The final report will include, but not be
limited to, a narrative description of the data acquisition, an analysis of
the sediment fill in Lake Corpus Christi, and curves, cross sections, profiles
and other information acquired as part of this program.
Water Division contributions
The USGS program is based upon the provision that all current lake data,
history, and the 1972 Sedimentation Study by McCaughan & Etheridge will be
provided to the USGS to assist in the program. It is assumed that Water
Division personnel assigned to the Wesley Seale Dam and to Lake Corpus Christi
will be available to provide incidental assistance to the USGS. The Water
Division will reimburse the USGS for expenses as set forth in the section
entitled, Cost Statements, and in the Joint Funding Agreement.
Cost Statements
The USGS proposes to provide all personnel, boats, and data collection and
processing equipment to complete the survey proposed herein.
USGS expenses reimburseable by Water Division
Data collection and processing
Equipment rental
Transit satellite receiver, 6,500.00
MX1502
Intergrated bathymetry system 4,500.00
Maxiran positioning system 3,900.00
Datasonic subbottom profiler 9,650.00
Portable electric generator 1,010.00
Boat rental 1,500.00
Shipping 1,000.00
Expendable supplies 500.00
5
$32,510.00
Computer and software,
Hydris is processing
MX1502 tape processing
2,250.00
1,700.00
5,500.00
6,000.00
13,768.00
4,500.00
2,250.00
Labor costs 32,018.00
Contract operator for MX1502
Contract operator for intergrated
bathymetry and Golf III
USGS - Electronic Technician
John West 88 days
Per diem
3 men, 30 days, $50/day
MX1502 operator expenses
30 days, $50/day
Sub -total 64,528.00
Assessment @ 5% 3,226.40
Total for data acquisition and processing $67,754.40
Data analysis and map and report preparation
Contract aerial photography 15,000.00
Rates of sedimentation study 14,300.00
Salaries 36,960.00
Consultant 4,000.00 Harry Boryhill
80 hours @ $50.00/hr.
Geophysicist 9,200.00
90 days
Geologist 6,320.00
60 days
Project Chief & Senior Geophysicist 16,060.00 Bell
80 days
Typist 1,380.00
20 days
Contract drafting — 352 hours @ $12.50/hr. 6,600.00
Miscellaneous expenses 1,000.00
Printing and reproduction 700.00
Expendable supplies 300.00
Subtotal
Assessment — 5%
Total for analysis, map and report preparation
Total reimbursement by Water Division
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73,860.00
3,693.00
$77,553.00
$145,307.40
USGS non—reimbursable expenses
The USGS will contribute personnel, supplies, and equipment to the survey, at
no cost to the Water Division, as follows:
Personnel
Electronic Technician, 30 days
Per diem, 30 days @ $50/day
Data collection and processing
Equipment
Recording fathometer
Graphic recorder for
subbottom profiler
Magnetic tape recorder
Radio communications
Small boat and motor for
Nueces River work
Transit satellite receiver
Pickup
Preliminary survey, Nueces River
Expendable supplies
$4,641.00
1,500.00
2,250.00
1,800.00
3,000.00
1,800.00
1,000.00
10,300.00
1,000.00
$6,141.00
21,150.00
1,000.00
890.00
Total contribution by USGS $29,181.00
Key Personnel
Professional Affiliations:
Wifred Hasbrouck — Geophysicist
Education: Colo. Sch. Mines, D. Sc. 1964
Experience:
Seismic crustal studies development of magnetic methods, and geophysics
and development of high resolution seismic techniques with emphasis on
shear waves.
Publications:
Over 50 including recent summary of research on use of shear waves.
John West - Electronic Technician
Education: Penn State Univ. Electronics, 1964 - 1966
Univ. of Nev., Las Vegas Geology, 1968 — 1969
Government and industry electronic training
schools and symposia.
Experience:
Geological and geophysical data acquisition in marine
areas (Gulf of Mexico, offshore California, Alaska),
on lakes (Lake Corpus Christi, Great Salt Lake), and
rivers (Colorado River). Equipment used includes
multichannel and high resolution analog and digital
seismic recording and playback systems, side—scan
sonar, precision and long range navigational systems,
deep and shallow water bathymetric systems and others.
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Publications:
High resolution seismic data acquisition and seismic
stratigraphy.
Corpus Christi, Texas
3o day of mb r , 198go
TO THE MEMBERS OF THE CITY COUNCIL
Corpus Christi, Texas
For the reasons set forth in the emergency clause of the foregoing ordinance
or resolution, an emergency exists requiring suspension of the Charter rule
as to consideration and voting upon ordinances or resolutions at three
regular meetings; I/we, therefore, request that you suspend said Charter rule
and pass this ordinance or resolution finally on the date it is introduced,
or at the present meeting of the City Council.
Respectfully, Respectfully,
MAYOR
99.045.01
Council Members
/ AK
7w5
THE CI OF CORPUS CHRISTI, TEXAS
The above ordinance was passed by the following vote:
Luther Jones 041
Dr. Jack Best
David Berlanga, Sr.
Leo Guerrero
Joe McComb
Frank Mendez
Bill Pruet
Mary Pat Slavik
Linda Strong
Qi
19594