HomeMy WebLinkAbout11091 ORD - 09/20/1972• JRR:Jkh:9- 19- 72;lst
AN ORDINANCE
AUTHORIZING THE CITY MANAGER TO ENTER INTO A CONTRACT
WITH McCAUGHAN & ETHERIDGE, CONSULTING ENGINEERS, FOR
THE PURPOSE OF CONDUCTING A SILT SURVEY OF LAKE CORPUS
CHRISTI, ALL AS IS MORE FULLY SET FORTH IN THE CONTRACT,
A COPY OF WHICH IS ATTACHED HERETO, MARKED EXHIBIT "A ",
AND MADE A PART HEREOF; AND DECLARING AN EMERGENCY.
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF CORPUS CHRISTI,
SECTION 1. That the City Manager be, and he is hereby, authorized
•
to enter into a contract, for and on behalf of the City of Corpus Christi,
with McCaughan & Etheridge, Consulting Engineers, for the'purpose of
conducting a silt survey of Lake Corpus Christi, all as is more fully set
forth in the contract, a copy of which is attached hereto, marked Exhibit "A ",
and made a part hereof.
SECTION 2. The necessity to enter into the aforesaid contract at
the earliest practicable date in order that a survey may be made of
the siltation of Lake Corpus Christi creates a public emergency and an
imperative public necessity requiring the suspension of the Charter rule
that no ordinance or resolution shall be passed finally on the date of
its introduction but that such ordinance or resolution shall be read at
three several meetings of the City Council, and the Mayor having declared
that such emergency and necessity exist, having requested the suspension
of the Charter rule and that this ordinance take effect and be in full
force and effect from and after its passage, IT IS ACCORDINGLY SO ORDAINED,
this the o-T day of September
ATTEST;
r ���
Ci y Secre a
APP VED:
DAY1 OF SEPTEMBER, 1972:
uiry AttoFne
I®91
•
THE STATE OF TEXAS x
COUNTY OF NOECES X
WHEREAS, in the years since the building of Wesley Seale Dam,
Lake Corpus Christi has been silting up at an unknown rate; and
WHEREAS, in order to accurately and adequately provide ample
supplies of water for the citizens of the City of Corpus Christi and
surrounding areas, it is imperative to determine the amount of siltation;
and
WHEREAS, such a survey is also necessary to investigate and
maintain the quality of the water supplied to the citizens of this area
and the survey is necessary to check water pollution with the end of
abating same; and
WHEREAS, the firm of McCaughan 6 Etheridge, Consulting Engineers,
is well able by training and experience to conduct said survey; and
WHEREAS, said firm on July 3, 1972, submitted a proposal for such
survey which is imminently sound and reasonable and such proposal is the
most feasible and represents the lowest cost survey plan presented to the
City of Corpus Christi:
NOW, THEREFORE, for and in consideration of the payments, under-
takings and covenants, herein do the City of Corpus Christi, a municipal
corporation and body politic, hereinafter called "City ", and McCaughan and
Etheridge, Consulting Engineers, hereinafter called "Contractor ", hereby
covenant, agree and contract as follows:
I
Contractor agrees to conduct a silt survey of Lake Corpus Christi
in accordance with their proposal presented July 3, 1972, which is attached
hereto as Exhibit "A" and made a part hereof by this reference the same
as if written herein. Said survey will use modern electronic equipment
and methods which are now available using sophisticated electronic equip-
ment for emission of sound waves and measurement of their return time and
bottom characteristics of the Lake. This equipment will measure bottom
depths and silt thickness by continuous acoustical profiling from a boat.
The boat location will be continuously monitored and recorded by radio
distance measurement from two (2) shore stations.
1 Zyg '�� It
•
II
Contractor agrees to produce for the City 125 to 175 miles of
cross - sections and profiles of said Lake with depth measurements with an
accuracy of plus or minus 0.3 feet and location spotting accurate within
five (5') feet. Contractor will also provide photographic samples of the
profile charts with interpretations. All of the profiles will then be
hand plotted on a map of the Lake and bottom contours plotted which will
give the Lake area- capacity relations as of now. Contractor will also
prepare an "isopac'.' map of the Lake showing sediment thickness. Comparisons
with the original cross - sections will be made where possible.
III
It is mutually agreed that Contractor will engage the services
of the Southwest Research Institute to perform the bathymetric and location
phases of the survey. Said phase shall be under the direction of Contractor,
who will also prepare the depth plotting, mapping and final report. None
of the other services of this survey may be subcontracted without the
specific approval of the City.
Fvi
The City agrees to provide access to its field books and records
and assist in obtaining access by the Contractor to the field books and
records of the Lower Nueces River Water Supply District. Both parties
mutually agree that part of the purpose of this survey is to maintain the
quality of water in the Lake and the City's water supply. For the purposes
of maintaining water quality and for the purpose of entering private
property under Sec. 21.353, Texas Water Code, Acts 1971, 62nd Legis.,
Chapter 58, and for those purposes only, the Contractor and its employees
are designated as agents of the City with full rights thereunder.
V
This contract is not for any stated period of time but is for
the performance of the silt survey as provided for herein and as more
specifically detailed in the herein incorporated Exhibit "A ". The services
of the Contractor are to commence as soon as practicable after the execution
of this Contract and shall be undertaken and completed in such sequence
-2-
r�
as to assure the expeditious completion of the study. In no event, however,
shall the study extend past , except for unusual
circumstances, in which the City may grant an extension of time in its
discretion. The parties hereto mutually agree that the City will monitor
and review the ongoing study.
VI
For and in consideration of said study, the City agrees to pay
the Contractor the sum of Twenty Thousand Dollars ($20,000), one -half of
which is to be paid upon receipt of a statement of completion of the hydro -
graphic work and the remainder upon completion and approval of the project
and approval by the City of the final report.
WHEREFORE, WITNESS OUR HANDS,.binding the respective parties,
this the day of , 1972.
CITY OF CORPUS CHRISTI
ATTEST:
City Secretary
APP�,tQJjID:
_DAY OF SEPTEMBER, 1972:
C'/'" ' Ae
Cit A
t�
By.
R. Marvin Townsend
City Manager
McCAUGHAN & ETHERIDGE
By.
ffffl }l}\\\\
�I
Orua L. L.r�r u�VrR. VL
MCCAUGHAN & ETHERIDGE
CLIMJULTrNO ER ❑iRLLR9
320 Wage. U.-I-0
CaRVus CHRISTI. TEXAS 70401
July 3, 1972
Mr. R. Marvin Townsend
City Manager
P. O. Box 9277
Corpus Christi, Texas 78408
Dear Mr. Townsend:
Mr. Atlee Cunningham has requested that we submit a proposal to
you for making a silt survey at Lake Corpus Christi. We therefore take
pleasure in submitting the following proposal for your consideration.
Prior to completion of Wesley Seale Dam numerous cross sections
of the future lake bottom were taken and reference points set near the ends
of these sections. It was the intent that future surveys could be made at
these same locations so that the amount of siltation could be determined
from time to time. During the approximately 20 years since these surveys
were made and since the lake has been filled, there has been a great deal
of development around the lake. It is not known how many, if any, of the
markers or reference points on these surveys can now be found.
The extensive field work required simply to re- establish the old
range lines would be time- consuming and costly, and the cross - sectioning
in the lake would be even more so. Results could be very misleading
because of the difficulty of determining location, uncertainty of bottom
depth when using weighted lines, and the impracticability of taking a large
number of measurements.
When Wesley Seale Dam was built, hand surveying was just about
the only means of accomplishing the cross - sectioning. Modern electronic
equipment and methods are now available, and we propose to do the project
in this manner. The bottom depths and silt thickness will be measured by
continuous acoustical profiling from a boat. This method uses sophisticated
electronic equipment for emission of sound waves and measurement of their
return time and bottom characteristics. The boat location will be continuously
'e -
'Y1,1181 ?
1
All-. It. 1118 1'\1111 A In'6 Pal a
July 3, 197.'. '
•
monitored and recorded by radio distance measurement from two shore
stations. Depth measurements should have an accuracy of plus or minus
0. 3 feet, which could probably not be equalled by hand line. Location
spotting will be accurate within 5 feet. Depths and locations will be charted
automatically by the equipment. Using this procedure, we expect to produce
125 to 175 miles of cross - sections and profiles. We will provide photo-
graphic samples of the profile charts, with interpretation. All of the pro-
files will then be hand plotted on a map of the lake, and bottom contours
plotted, giving the lake area - capacity relations as of now. We will also
prepare an "isopac" map of the lake, showing sediment thicknesses. We
will make comparisons with the original cross - sections where possible.
Some field surveying will be required for the establishment of the
radio control network and other control work. Access through private
property will be minimized, however. To handle the project effectively we
will need full access to the field books and records of the Lower Nueces
River Water Supply District. We further request that the City provide
right of entry on private property as needed, and afford us legal protection
equivalent to that provided in Par. 51. 136 of the Texas Water Code.
It is our intention to engage Southwest Research Institute to perform
the bathymetric and location phases of the survey, under our direction, with
depth plotting, mapping, and final report to be prepared by our staff. The
"design" of the mapping and reporting phases of the presentations will
determine its usefulness for the City's immediate needs and will provide
the basis for future follow -ups at less expense.
A period of several weeks will be required for organization, gathering
of available data, pre- mapping, and scheduling of boat and equipment. In
addition to the time needed for this pre - planning, Mr. Etheridge will be
keaving July 15 to attend courses at the River Mechanics Institute at Colorado
State University, returning August 15. River and reservoir siltation will
be among the topics, and the information he brings back will surely be of
help toward producing a survey of more value to you.
We expect to accomplish the boat work either in the latter half of
August or the latter half of September. Plotting, mapping, analysis and final
report preparation would then require two to three months, or until some time
in November or December. We propose to do the work as outlined above for
a fee of $20, 000. 00, payable one -half on completion of the hydrographic work
and one -half on completion of the project.
Very truly yours,
McCAUGHHAN & ET�HERIIDDGE
By_C/ //
Cc: Mr. Atlee Cunningham F. A.' McCaugh,>t, P. E.
Mr. Bob Schneider
4
2
CORPUS CHRISTI TEXAS
DAY OF 19 z z
TO THE MEMBERS OF THE CITY COUNCIL
CORPUS CHRISTI TEXAS -
FOR THE REASONS SET FORTH IN THE EMERGENCY .CLAUSE OF THE FOREGOING
ORDINANCE, A PUBLIC EMERGENCY AND IMPERATIVE NECESSITY EXIST FOR THE SUSPEN-
SION OF THE CHARTER RULE OR REQUIREMENT THAT NO ORDINANCE OR RESOLUTION SHALL
BE PASSED FINALLY ON THE DATE IT IS INTRODUCED AND THAT SUCH ORDINANCE OR
RESOLUTION SHALL BE READ AT THREE MEETINGS OF THE CITY COUNCIL; I, THEREFORE
REQUEST THAT YOU SUSPEND SAID CHARTER RULE OR REQUIREMENT AND PASS THIS ORDI-
NANCE FINALLY ON THE DATE IT IS INTRODUCED, OR AT THE PRESENT MEETING OF THE
CITY COUNCIL. -
PECT LLY,
e
YOR
THE CITY OF COR HRISTI,• TEXAS
THE CHARTER RULE WAS SUSPENDED BY THE FOLLOWING VDTEL
RONNIE SIZEMORE
CHARLES A. BONNIWELL
ROBERTO BOSQUEZ, M.D.
- - - REV. HAROLD.T. BRANCH
,. THOMAS V. GONZALES
GAGE L02AN0, $R. '
' V. HOWARD STARK
THE ABOVE ORDINANCE WAS PASSED BY THE FOLLOWING VOTE:
- RO NNIE SIZEMORE —
CHARLES A. BONNIWELL - --
- ROBERTO BOSQUEZ, M.D.
REV. HAROLD T. BRANCH
THOMAS V. GONZALES Q -•-�,� -
GAGE LOZANOp SR.
J. HOWARD STARK �—