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Home My WebLink About16571 ORD - 09/30/1981sp;9/28/81;lst AN ORDINANCE AUTHORIZING THE CITY MANAGER TO ACCEPT THE PROPOSAL SUBMITTED BY TRINITY ENGINEERING TESTING CORPORATION FOR A GEOTECHNICAL INVESTIGATION AT THE FLOUR BLUFF WASTEWATER TREATMENT PLANT; APPROPRIATING $4,013.25 OUT OF THE NO. 250 SANITARY SEWER BOND FUND APPLICA- BLE TO PROJECT NO. 250-77-19, LAGUNA MADRE (FLOUR BLUFF) PLANT EXPANSION; AND DECLARING AN EMERGENCY. BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF CORPUS CHRISTI, TEXAS: SECTION 1. That the City Manager be and he is hereby authorized to accept the proposal submitted by Trinity Engineering Testing Corporation for a geotechnical investigation at the Flour Bluff Wastewater Treatment Plant. SECTION 2. That there is hereby appropriated $4,013.25 out of the No. 250 Sanitary Sewer Bond Fund applicable to Project No. 250-77-19, Laguna Madre (Flour Bluff) Plant Expansion. SECTION 3. That upon written request of the Mayor or five Council members, copy attached, to find and declare an emergency due to the need of investigating the subsurface soil so that the expansion of the Flour Bluff Wastewater Treatment Plant can proceed on a timely basis, 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 take effect upon first reading as an emergency measure this day of September, 1981. ATTEST: Ci Secretary nA�,PED: `DAY OF SEPTEMBER, 1981 Bruce Rycock, C ty Attorney MAYO THE CITY OF CORPUS CHRISTI, TEXAS SEP 9,7 �9A4 MICROFILMED September 4, 1981 TRINITY ENGINEERING TESTING CORPORATION 5002 31493094000 3001 P. 0. 90* 4203 00520* CH31071. TEXAS 70403 5121054.4774 City of Corpus Christi Engineering and Physical Development P. 0. Box 9277 Corpus Christi, Texas 78408 Attention: Mr. Gerald Smith, P.E. Subject : Flour Bluff Wastewater Treatment Plant Corpus Christi, Texas Gentlemen: In response to your recent request, I am pleased to submit the attached Professional Services Estimate for a Geotechnical Investigation for the above referenced project. Details of the investigation are discussed in the following paragraphs. Field Investigation: After examining the plot plan, boring locations and boring depths, it became quite obvious that, though the number of borings was adequate, the depths of -the borings were insufficient for this type of construction. Additionally, it has been our experience that the sands in the coastal areas of the Encinal Peninsula and Mustang Island increase in density (and, hence, allowable bearing capacity) to a certain depth (generally, 10-20 feet) then dramatically decrease in density. If the zone of influence of the foundations to be constructed extends into these_ loose sands, then the design criteria for these structures may have to be based on the loose sands at the deeper depths rather than the shallower denser sands. Because of the above mentioned subsurface anomaly, deeper borings are recommended and are presented below in Table A: TABLE A PROPOSED BORING DEPTHS Boring No. Depth, feet 1 15.0 2 15.0 3 30.0 4 30.0 5 30.0 6 30.0 7 30.0 IK`1 „11', City of Corpus Christi September 4, 1981 Page 2 These recommended depths have been discussed with the prime consultant. The drilling procedure will be as follows: The soil will be sampled con- tinuously by thin-walled sampling tubes (ASTM D-1587) until refusal is reached. When refusal is met, the boring will be advanced using water as a drilling fluid and testable samples or Standard Penetration tests (ASTM D-1586) will be taken at 5.0 -foot intervals. The Standard Penetration test will also be conducted in granular deposits should such deposits be en- countered. The borings will be observed for groundwater prior to using drilling fluid to advance the borings. At one of the boring locations, a slotted P.V.C. pipe will be installed for future groundwater observations. Variations in soil types may require drilling procedures other than those described above. The unit price shown on our estimate form reflects the more expensive and preferred form of drilling (continuous coring); there- fore, our field operations reflect a maximum cost. Laboratory Testing: Atterberg Limits tests (ASTM D-423, ASTM D-424) and minus 200 -mesh sieve tests (ASTM D-1140) will be performed on selected samples to establish grain size characteristics and to aid in the classi- fication of the soils. All soil classifications will be made according to the Unified Soil Classification System. Estimated strength evaluations of the cohesive soils will be made with a pocket penetrometer or a Torvane. Unconfined compression tests (ASTM D-2166) will be performed to establish more specific strength characteristics of the cohesive soils. Unit dry weight and moisture content tests will be performed to measure density and water content characteristics of the cohesive soils. If swelling soils are encountered, an absorption pressure and swell test will be performed to measure volume change characteristics. If compressible soils are encountered, a consolidation teat will be performed to evaluate the compressibility charac- teristics of soils and generate time -settlement estimates. The resins of the subsurface exploration and laboratory testing program will be utilized in engineering studies to determine desirable foundation types, depths and unit loading intensities. These results will be reported in a formal, bound report. Five copies of the report will be provided unless otherwise directed. Estimated Cost and Schedule: The services discussed in the preceding para- graphs will be performed at the unit prices shown on the attached estimate form. Please inform us by phone as soon as authorization to proceed is granted so that the necessary scheduling plans can be arranged. We are looking forward to working with you on this project. If you have any City of Corpus Christi September 4, 1981 Page 3 question regarding our estimate, please call. Respectfully submitted, TRINITY ENGINEERING TESTING CORPORATION (TETCO) Robert H. Holloway, P.E. Geotechnical Engineering Division RHH:mm Attachment September 4, 19 81 PROFESSIONAL SERVICES ESTIMATE FOR: GEOTECHNICAL INVESTIGATION FLOUR BLUFF WASTEWATER TREATMENT PLANT SERVICE QUANTITY UNIT PRICE TOTAL Field Operations: Mobilization 25 mi. $ 1.85 Core Drilling and Sampling 180 1.f. 10.00 Field Penetration Tests and/or Unconfined Compression Tests Groundwater Monitor Well Field Subtotal Laboratory Investigations: Classification Tests a. Atterberg Limits Tests b. Minus 200 -Mesh Sieve Tests Volume Change Tests a. Absorption Pressure -Swell Test b. Consolidation Test Laboratory Subtotal $ 46.25 1800.00 57 ea. 17.00 969.00 1 ea. 50.00 50.00 4 ea. 10 ea. $ 2865.25 30.00 $ 120.00 15.00 150.00 1 ea. 75.00 75.00 1 ea. 150.00 150.00 ' Engineering Analysis and Report Preparation: Geotechnical Engineer_(P.E.) 10.0 hrs. Report Preparation (Drafting and Typing) 9.0 hrs. Xerox Reproduction and Postage 5 repts. Engineering Subtotal $ 495.00 45.00 $ 450.00 17.00 153.00 10.00 50.00 $ 653.00 We estimate that these services will cost approximately $ 4013.25 This cost includes our regular fees for the basic services listed above. Variations from the outlined program, Including additions or deletions, will be adjusted at our regular fees. In the case of core borings, the client is to provide right -of -entry on property and truck access to boring locations. Accepted by: R. Marvin Townsend, City Manager APPROVED: DAY OF SEPTEMBER, 1981 Respectfully submitted, Trinity Engineering Testing Corporation By Robert H. Holloway, P.E. Geotechnical Engineering Division CITY OF CORPUS CHRISTI, TEXAS CERTIFICATION OF FUNDS (City Charter Article IV Section 21) September 21, 1981 I certify to the City Council that $ 4,013.25 , the amount required for the contract, agreement, obligation or expenditures contemplated in the above and foregoing ordinance is in the Treasury of the City of Corpus Christi to the credit of: Fund No. and Name Project No. No. 250 Sanitary Sewer Bond Fund 250-77-19 Project Name Laguna Madre (Flour Bluff) Plant Expansion frau which it is proposed to be drawn, and such money is not appropriated for any other purpose. (TETCO Testing) 4u 6 FIN 2-55 Rrsed 7/31/69 q.0 Corpus Christi, as £a day of , , 1981 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, Council Members MAYO THE CITY OF CORPUS CHRISTI, TEXAS The above ordinance was passed by the foll.wing vote: Luther Jones Betty N. Turner Jack K. Dumphy Bob Gulley Herbert L. Hawkins, Jr. Dr. Charles W. Kennedy Cliff Zarsky 16571