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HomeMy WebLinkAboutR-78-0336RESOLUTION NO. 73 a 3 36 A RESOLUTION AUTHORIZING THE CITY MANAGER TO EXPEND AN AMOUNT NOT TO EXCEED $45,000.00 FOR SUBSURFACE INVESTIGATIONS IN CONNECTION WITH THE JAMES L. KNIGHT INTERNATIONAL CENTER PROJECT FOR THE PURPOSE OF ASCERTAINING THE FEASIBILITY OF UTILIZING MAT -TYPE FOUNDATIONS WITH CONSEQUENT COST SAVINGS AND AUTHORIZING THE CITY MANAGER TO NEGOTIATE AN AGREEMENT WITH LANGAN ENGINEERING ASSOCIATES, INC., FOR SUCH SUBSURFACE INVESTIGATIONS. WHEREAS, the City has entered into Agreement with MIAMI CENTER ASSOCIATES, LTD., (DEVELOPER) and MIAMI CENTER ASSOCIATES, INC. (CONSTRUCTION MANAGER) by Resolutions No. 77-820, dated 19 October 1977, and No. 78-74, as amended, dated 24 January 1978, to provide, among other things, construction management services for the James L. Knight International Center (PROJECT); and WHEREAS, the CONSTRUCTION MANAGER recommended that further subsurface investigations be conducted to determine the feasibility of employing mat -type foundations instead of pile type foundations as a cost savings item in the construction of the PROJECT; and WHEREAS, the funds are provided under the City of Miami Capital Improvement Program for the City of Miami/James L. Knight International Center; and WHEREAS, the firm of Langan Engineering Associates, Inc., submitted its proposal No. J-787, dated 2 May 1978, in response to the City's solicitations for specialized subsurface investiga- tions; and WHEREAS, the City Manager recommends acceptance of said proposals; NOW, THEREFORE, BE IT RESOLVED BY THEE COMMISSION OF THE i'OCU.MENTINDEX CITY OF MIAMI, FLORIDA: ITEM N `M.. L2.. ., r;; Section 1. The City Manager is hereby authorized to expend an amount not to exceed $45,000.00 from available funds, as enumerated on the above -mentioned Agreements, for the subsurface CITY COMMISSION MEETING OF MAY 1 9 1978 no - : .1 IMAM investigations; and Section 2. The City Manager is hereby authorized to enter into at Agreement with Langan Engineering Associates, Inc,, whereby the firm will provide subsurface investigations and related work in accordance with its Proposals No. J-787, subject to ratification by this Commission at a later date. PASSED AND ADOPTED THIS 19 day of MAY , 1978 MAURICE A. FERRE, MAURICE A. FERRE, MAYOR ATTEST: (:;;;:: 47/ (521 L H NGIE, CITY CLERK PREPARED AND APPROVED BY: -1 V C� TERRY . 11111.41 ASSISTANT C TY ATTORN APPRO S TO FORM AND CORRECTNESS: G'IRGE F. KNOX, CITY ATTORNEY 2- 78-336 Joseph R. Grassie City Manager V ,James J i' Gonnol ly i/Project�irector Convention Center May 9, 1978 James La Knight International Center soils and Foundation Investigations Enclosed are proposals from Langan Engineering Associates; Inc., and Dames & Moore, to provide consulting geotechnical services for the above referenced project. Both firms have had experience with investigating subsurface conditions of high rise structures in the Miami and South Florida area whereby foundations were constructed on mats instead of pilings and consequently the owners realized savings in the order of $500,000 or more. Both Morris Kaufmann and I reviewed both proposals and recommend that the City enter into an Agreement with Langan Engineering Associates, Inc., to provide the necessary consulting services. While both firms are highly qualified to provide the expected services, it was our opinion that Langan's proposal would result in a lower cost and also accomplish the work in a shorter period of time. The attached Resolution authorizes the City to expend funds from available funding sources in an amount not to exceed $45,000.00 for this investigation work and authorizes the City Manager to negotiate an Agreement with Langan that will be ratified later. Enclosures: 1. Proposals from each firm 2. Draft Resolution r78-336 I kik 3 t...L,Z4,= LANOAN ENOINLCItING ASSc CLAfi S, INC. 2 May 1.978 C-787 Morris I. Kaufmann City of Miami, Florida Office of the City Manager 3500 Pan American Drive P.O. F3ox 330708 Miami, Florida 33133 Re: Proposal for Consulting Engineering Services Miami Convention Center Dear mr. Kaufmann: We are pleased to submitt this proposal for consulting geo- technical engineering services for the proposed Miami Convention Center. The Convention Center is to be located North of the Miami River and East of Interstate Highway 95. We understand it will include an exhibition hall, ball room, auditoriums, and an L shaped 12 to 14 story hotel above the convention center. The following gives descriptions for the three phases of the work identified in your 26 April 1978 letter, together with our estimates of cost. Phase 1-Analysis of Existing Soil Test Data Existing soil test data is understood to consist of the logs of 30 to 40 borings drilled to depths of 70 to 80 ft below ground surface. We have examined the Logs of five of these borings and have been informed they are reprc3entative of conditions found in •'v 07013 i 1201) 4 2-< _CO -2- the other borings. Split :spoon samples were taken and Standard Penetration 'DestS were Made at 1,5 ft to 5 ft depth intervals in each boring. The togs show NX site cores wete taken between Depths of 48 ft and 55 Et in four of the borings. The materials are described as Silica Sand, titnesand and Limestone. Analysis of these data will include preparation of geologic profiles showing the subsurface materials and results of the Standard Penetration Tests. The samples will be examined and if necessary, mechanical analyses will be :made. The data will be evaluated with respect to the density, thickness and uniformity of the sand and limestone layers. Particular attention will be given to the location, sizes, and patterns of loose sand pockets and voids that may be present within the limestone hecause of the proximity of the site to the Miami River. In addition, the locations of the borings with respect to planned shear wall and column locations will also be evaluated. The subsurface conditions at other sites in the Miami area including Omni International Miami Complex, will be compared with the conditions at the Convention Center and the extent of additional investigation will be determined. Phase 2 - Additional Soil Test ?ased on t:he results of ' ase 1, :e will develop a program of additional investigation. In addition, it is our intention to have discussions qith the e,t:ruc:tural engineer concerning the :,I.irmer in :alch the l'ui ldings are Lo be connected and :but one another. At this time we anticipate the additional investigation will include check-orings with S:'."i; lard 7eneLr:':ticn Tests and Static Cene :'f:ne- f:ration :)rt;be b. For estie.ating purp".os we have :s:'Ui.?d L. NGAN -3- f�' borings and twenty static cone penetration probes will be made. The boring would be drilled to about sixty feet ih the area of the proposed hotel and in other areas whore existing data indicate uncertain or marginal conditions. The major portion of the static cone tests would also be made iti the hotel area. They would be made to depths of 40 to 50 ft. The Static Cone Penetration Probes will give an essentially continuous profile of cone resistance in t/ft2 versus depth. This type of data gives a direct indication of the strength and compressibility of the underlying ;material. We have a considerable amount of static cone penetration data from other Miami area projects that would be used in evaluating the results obtained at the convention center site. Phase 3 - Mat Foundation Feasibility Study We would evaluate the feasibility of supporting the hotel structure on a mat foundation. In addition, we would examine the possibility of supporting the other structures on shallow spread or strip footings. The study would utilize the results of the subsurface investigation and our experience with other mat supported high rise structures and foundation conditions in the Miami area. We would determine whether or not preloading would be required. Other high rise structures in the Miami area have been constructed on mat foundations without preloading, however, there has been measurable total and differential settlements of significant magnitude. This study would consider the interaction of the different structures within the Convention Center Complex, the magnitudes LANGAN ENGINEERING ASSOCIATES, INC and locations of potential total and differential settlements, and the amount and type of site preparation that may be needed. if a ;flat foundation proves feasible we would estahlish t:h? modulus of subgrc,de reaction needed to determine the .sat thickness and the moments and shear forces in the mat. The results of our study would be transmitted in the form of a report of our analysis of the subsurface data, our conclusion concerning appropriate foundation systems for the center, and appro- priate design criteria for computerized design of mat foundations and/or shallow foundations. Estimated Fees Our fee is haseed on the Schedule of Fees in Attachment A. Our current estimate of the man days and costs for each phase of work is as shown in Attachment B. The estimate totals $26,000. .:e would also anticipate there would be additional fees for consultation with the structural engineer during the foundation design phase. Our Pxper fence has been that our engineers may be needed to assist in the computer input and analysis, or our work may be limited to review of design details. We would also need to prepare technical specifications for any Ipecial site pre prat'.-)r procedures. Thus we anticipate an additional $2,000 to $6,000 in fees subsequent to Phase 3. Schedule We estimate the Phase 1 ,:irk will require 2 weeks. s. The 2 �'�1.d 1-quire 3 `:.o 4 eeks, aud :hale ,e 3, 2 we.2%s with n r!r l.tp -5- of Phase 2 by 1 week. Thus the total time for out final report would be 8 weeks after authori2ation4 buring this period we would keep you advised of out findings and preliminary foundation designs could be rude with related cost studies. She Look forward to participating in this project and welcome the opportunity to discuss this proposal with you at your convenience. Very truly yours, LANGAN ENGINEERING ASSOCIATES, INC. BFL/DJL:cr Bernard F. Langan, P.E. a (1 -/ 1 _ /rv Dennis J. Le,-lry, P .E. L. 'JGAN 1:NC:;,i LP. NG ASSOC:AI ES, if.0 S(`I i1-D1-iLE 01= 1=11-TS Dfr'ctive !January 1978 Engineering and InTection Services The fee for profe.sional staff is hosed on their payroll costs multiplied by 2,5 to 3.0 depending on the sire and complexity of the project. Unless indicated to the contrary multiplier of 2.5 will be used. Payroll rests include salary end benefits, The payroll costs for the various categories of pt_rso:inel are es follows: Senior Project Engineer $ ?6.f0/hr. Project Engineer ?0.00/hr. Assistant Project Engineer 3,50/hr. Senior Staff Engineer 2.00/hr. Staff Engineer 1.00/hr. Assistant Engineer/Engineering Technician 0.00/hr. Senior Inspector 0.00/hr. Design Draftsmen 0.00/hr. Inspector 8.80/hr. Draftsmen 8.80/hr. Typing 6.00/hr. 2. Laboratory Tests 11. Laboratory i:'sting will he billed (it unit rotes d;'7v_nc-ling on the type of test. A schedule of unit prices for standard laboratory tests is available upon request. Special Field Equipment Special field equipment such as nuclear densometers, Toad test equipment, surveying equipment, etc. will be pilled on a daily rote. Subcontract !terns Subcontracted work such as borings, lest pits, report reproduction, surveying, etc. will he billed at rost plus 10 n. 5. I1Xr)(nses All expenses incurred by us such ors: cur rlMenge, special supplies, long distance cornrnunic(rtions, travel, rind subsistence will he L:Ilar(ied at cost phis 10 v. INVOICES I f=D 1,"MO;NI-I 1l_Y d Jt) Al- l7 DUE_ WI 11 ;IN 30 DAYS. t r.c;rryirlg chnrge of 1`.�:, per month will he (i(lc!ed to ell outstc,ncling invoices. ,TEACH EN P 3 1STI!•it'CED COSTS c r,OTEC11;,1TcAL t;?7CTN ERtI1c SERVIcr]8 Mt7.ii CONVENTION tiENTP,A PhaSE 1 Senior Project Engineer 2 lays @ $520/day = $ 1040 Staff Engineer 6 days @ $220/day = 1320 Draftsman 3 r'ays @ $176/day = 528 Subtotal $ 2338 Phase 2 Senior Project Engineer 2 days @ $520/day = $ 1040 Project Engineer 4 days @ $400/day = 1600 S-.nior In.pector 15 days @ $200/day = 3000 Draftsman 3 days @ $176/day = 528 Travel, Subsistence, etc. 1500 Subtotal $ 7668 Subcontractor Cost Static Cone Penetrometer Probes 900 1.f. 2.$3. 50/ft = $ 3150 Borings 240 1.f. @ $6.00/ft = 1440 Mobilization = 400 Subtotal $ 4990 Phase 3 Senior 2roject ".ng i,;:?er 10 .'.;ys $520/day $ 5200 Project Engineer 5 day.; @ $400/day = 2000 Staff Ent iner 12 $22O ay = ".610 Dr.-� t....,�,n 2 '. ys 3 ; 1. ; :,/,i:�y = 52 qubtot:31 Tot'1 ti•.lt A Ccst $1 0l 92 $257?8 April 25, 1.978 City of Miami 65 S,W. First Street Miami, Florida 33130 Attention: Mr, Morris I. Kaufmann Assistant to the City Manager Proposal Foundation Investigation Proposed Convention Center and Hotel James I. Knight International Center Miami, Florida City of Miami ___________ _ _ Gentlemen: As you requested, we submit this proposal to perform a foundation investigation for a convention center and hi -rise hotel proposed to be constructed on a parcel north of the Miami River and west of Brickell Avenue. The convention center will cover an area about 200 feet by 300 feet, to a height of about 60 feet; the hotel will be an "L".shaped structure, wi th each wing about 120 feet long and with its apex at the south end of the complex, planned to be about 12-14 stories over the convention center. A program of subsurface investigations is in progress and indicates a shallow soil cover (about 5 feet) over Miami 0olite and other coralline limestone formations. The purpose of our investination would he to explore the feasibility of supporting the proposed facilities on a mat foundation(s), and, if so, to recor.;;nend design criteria for same and to estimate settlement behavior thereof. We would then also provide recommendations regarding the soils aspects of construction and design details of the work, including dewatering/waterproofirig, earthwork, and the like. To accomplish the purpose outlined above, we propose the following scope of work: 1. To drill 6 borings, to depths of 100 feet, within the area of the proposed hotel foundation, and 5 borings to depths of 50 feet within the remaining convention center area. The City of Miami .pri 1 25, 1978 Pane Two approximate location of these proposed borings is 'shown on the attached plan, Past experience with drilling techniques in the materials en- countered at the site indicates that the ':t.andtird sampling techniques (i .F?. , ....`Muting a split spoon by hemmer, or small diameter rock coring) produce severe distuchance of their skeletal structure. In order to assure that the samples obtained From the borings are enuinely representative of the actual subsurface conditions, .'e propose to drill into the coral i ine lii::estane for %,tion(s) .rith a lar''e diameter core barrel and to obtain, thereby, an essentially undisturbed sample of the materials. Past e}.per'iLnce indicates that larce diameter core recovery may be in the r;lnne of 75 to 90 percent, and that the materials will be a very porous coral l i ne l iestone honeycombed with small voids (on the order of inch to 1 inch diameter) containing some loose coral l i ne sands. The limestone is ;expected to be a very low density rock, but will p roh. bly have an unconfined compressive strength of . 0 p0'.inds per square inch or more. 2. To perform laboratory trysts on selected cores to assess the strength ;and co:; pressi bi l i ty of the undisturbed materials. It is pro` -,able that the data i''jm the strength tests would e utilized t0 essess 1,oth `,_r:. e ters (strength and cU':'ii)ress- i bi l i ty ), h nas:: uch as eonventi c'nal CQhsol i dati on testing For soils would be ir'practical for the ❑iaterials anticipated. 3. To perform engineering analyses that would yield the technical basis for our estimates of allowable hearing pressure and u l ti; a to settlement, as well as our recommendations for the dowiterinq/r:-lterproofing system and other soils related aspects of the project. We propose to consider such analytical nI; thndologies as may he appropriate in estimating settlei:;ents including_ elastic vlethods, c{ilpirir_al methods, and the Finite [1:.,nt 4. To prepare a report ';'.immari z i rig our work and presenting our conclusion and recou;:endations. e e(ol l !coin .;iir field ..t:r k .:1 ".(illl :::0 ..ee;.5 of receipt of ;our !Tiff f ii'':i_ll n (i ,;i plc .d, old 'i Le Hat the rigid .:»lr•h; ,i"d ,n C to 7 i:S. :iltlld Crt ,lni.'.f UI' ,'or: t0 ..void int: r- frlri!ic ,lien .r(: -il,}`11c:i tii;ltion rr`.,.. in ;irr''lress, 'Tut a 1 �/ r .byVother�1 {1 . h:>re .�t.1 i� t�.c no ,rr:l a, ,: u;r:d that or an, Tiff ,:Hoff; (e ,.Qlllli t i Toll: !Ito' !il'1 11 .!17 i 1:11; „'!li ..i re r. :c'?scar'y t0 .void 'i ,''r' .ri l ill :I 0i -•tilt :tl our City of Miami April 25, 1978 Page Three laboratory and engineering studies within 3 weeks of completion of the field exploration, and would submit a draft of our final report to you two Creeks after completion of the engineering studies. Our final report would be submitted within two weeks of receipt of your comments. We propose that our fee for this work be based upon the attached Schedule of Charges and General Conditions. We estimate, on this basis, that total charges for all services, including subcontracted drilling (using Warren George of Hoboken, 'te►•. Jersey, although we could make arrangements to utilize the services of local drilling contractors if these are available) would be about 55,000 to 60,000 dollars. We request you authorize the sum of 60,000 dollars as a maximum not to be exceeded without a change in conditions and without your written permission. We look forward to being of service to you on this interesting and challenging project. If you have any question, please call us. Yours very truly, DAMES & M iOORE Carl W. Ga rbe Partner Attachments: Plan Schedule of Charges ENE ..(HEIL LE OF ( II \ \ND (-2ENE R ( ()4It. • IONS D siAi ADA rite compen•ation to Dorm..., N. `ainoto for our toolt:‘,1••t:ols..tvit I r.e•I Ily the dk. merits, \%hielf are Lornputed ‘et forth Pi:RSONNEL. 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