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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 �—