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1988-0060923L NO &-QQJ~P AN ORDINANCE AUTHORIZING THE EXECUTION OF A CHANGE ORDER TO A CONTRACT BETWEEN THE CITY OF DENTON AND TONTO CONSTRUCTION, INC , AND PROVIDING AN EFFECTIVE DATE WHEREAS, on February 17, 1987, the City awarded a contract for the construction of certain improvements to the Water Treatment Plant Upgrade Phase II, Bid No 9657, and WHEREAS, the City Manager having recommended to the Council that a change order be authorized to amend such contract and said change order being in compliance with the requirements of Chapter 252 of the Local Government Code, NOW, THEREFORL, BE IT ORDAINED BY THE COUNCIL OF THE CITY OF DENTON in t the contract amount between the SECTION I That the change order City and Tonto Construction, Thousand Nine Hundred Seventy-eight Dollars and Twenty-five Cents (12,978 25) is hereby approved and the expenditure of funds therefor is hereby authorized SECTION II That this ordinance shall become effective immediately upon its passage and approval PASSED AND APPROVED this the 5th day of January, 1988 RAY rT HhNS, MAYOR ATTEST JE RI ER WALTERS, CI Y SECRETARY APPROVED AS TO LEGAL FORM DEBRA ADAMI DRAYOVITCH, CITY ATTORNEY BY ~/V DATE January 5, 1988 CITY COUNCIL REPORT TO Mayor and Members of the City Council FROM Lloyd V Harrell, City Manager SUBJECT CHANGE ORDERS # 5, 7, 9 - TONTO CONSTRUCTION BID# 9657 WATER TREATMENT PLANT UPGRADE PHASE II RECOM11ENDATION These change orders above are recommended to be approved by the staff and the Public Utilities Board SUMMARY The change orders are explained in full on the attached and represent only a small percentage of the overall contract price These change orders when approved will be paid from our purchase order 181945 The total cost of the three change orders is $12,978 25 BACKGROUND Detailed information on each change order with the information rom t ie ecember 16, 1987 Utility Advisory Board Meeting and Mr R E Nelson, Executive Director of Utilities PROGRAMS, DEPARTMENTS OR GROUPS AFFECTED City of Denton Utilities Water Expansion Project FISCAL IMPACT There is no additional impact on the General Fund Respectf ysuubmitted 4/ v/w Lloyd Harrell City Manager Prepared by 1 i1~ G12.~I~Cd~ ~f me J n J "Marshall, C P M Title -purchasing Agent Approved mei ohn J Marshall, C P M Titla` Purchasing Agent n~ CITY COUNCIL AGENDA ITEM TO MAYOR AND MEMBERS OF THE CITY COUNCIL FROM Lloyd Harrell, City Manager January 5, 1987 RE CONSIDER CHANGE ORDERS k5, M7, 8 M8, DENTON WATER TREATMENT PLANT UPGRADE ~ PHASE II, IN THE AMOUNT OF $12,978 25 RECOMMENDATION The Public Utilities Board, at their meeting of December 16, 1987, recommended to the City Council approval of Change Order M5, M7, $ N8 BACKGROUND Change Order 05 is to relocate power panel "PA" and to change all the grating from aluminum to fiberglass Power panel "PA" is being relocated from room 211 to the mezzanine level Relocating the power panel submitted by Tonto Construction will better utilize the available space and will result in a price reduction Changing the grating from aluminum to fiberglass will provide for greater resistance to corrosion caused by exposure to chemical substance Fiberglass was not originally specified because aluminum had been used in the past Change Order N7 is for revising the roof drain system This is required because the existing construction materials indicated on the as>built drawings were not as thick as those actually used In order to insure proper roof drainage, the drains were increased from three to four and relocated This also requires an increase in the amount of piping used Change Order N8 is for five miscellaneous items and for adding clean out unions on certain chemical lines The miscellaneous items are necessary to accomodate various changes in field conditions determined during demolition of the existing facilities These include adding three (3) 24" x 24" Milco style "K" doors in the ceiling of the chemical building, modifying the backflow preventer vault, deleting the raw water sample pump, revising the test procedures for the Allis°Chalmers pump, and deleting the 2" vacuum breaker from the sodium hydroxide tank Page 2 Unions and flange bolt connections are needed on the sodium hydroxide, ferric sulfate, flouride, and potassium permanganate lines to provide access points for cleaning The use of wyes, crosses and tees is prohibited because of limited space in the ceiling area and interference with other lines Quick disconnects in the heat tracing system will also be required at each union SUMMARY The City Council awarded the contract to Tonto Construction, Inc on February 17, 1987, in the amount of $3,592,000 With the previous change orders of $54,857 56 and these change orders for $12,978 2S, we now have a revised contract amount of $3,659,835 81, and a new completion date of July 5, 1988 Overall percent of change order is only 1 89% which is excellent Most projects run from 3 to 5% PROGRAMS, DEPARTMENTS OR GROUPS AFFECTED City of Denton, Denton Municipal Utilities, Freese & Nichols Inc , Tonto Construction, Inc , and the Citizens FISCAL IMPACT Budgeted Amount Original Contract Amount Change Orders Prior to this Date Current Contract Amount Change Order M5 Change Order M7 Change Order X8 Revised Contract Amount Total Amount of Change Orders to this Date Change Orders as a Percent of the Original Contract Amount Original Completion Date June 13, 1988 $4,000,000 00 3,592,000 00 54 857 $~G '"8STY '3 $1,253 85 3,204 25 8 520 15 $3,659:835 81 $67,835 81 1 89% Change in Time Due to Previous Change Orders 16 Days Change in Time Due to Change Orders N5, N7, $ N8 6 Days Revised Completion Date July 5, 1988 Page 3 Respectfully submitted, Lloyd Harrell, City Manager Prepared by C David Ham, D Drector Water/Wastewater Utilities Approved by It h Nelson, Executive Director Department of Utilities Exhibit I Change Orders M5, M7 f, k8 PUB Minutes of December 16, 1987 5235U 1~3 MNGE OR EXTRA IORR ORDER PROJECT: Denton Water Treatment Plant Upgrade - Phase 2 CONTRACT: No 9657 OWNER: City of Denton, Texas CONTRACTOR- Tonto Construction Co CHANGE ORDER NO.: Five (5) DATE. September 14, 1987 CEANGE OR EXTRA WORK TO BE PERFORMED 1 Relocate power panel "PA" from room 211 to the meszanine level of the shop as shown in the attached revision of Sheet 72 Amount to be Credited $1,408 98 2 Change all orating on the pro3ect from aluminum to fiberglass grating as described in the attached specification Section 06700 MISCELLANEOUS WOOD, PLASTIC, AND FIBERGLASS Amount to be Added $2,662 83 The compensation agreed upon in this Change or Extra Work Order is a full, complete and final payment for all costs the Contractor may incur as a result of or relating to this change whether said costs are known, unknown, foreseen or unforseen at this time, including without limitation, any cost for delay, extended overhead, ripple or impact cost, or any other effect on changed or unchanged work as a result or this change or Extra Work Order Previous Contract Amount $ 3,617,055 42 Net Increase in Contract Amount 1,253 85 Revised Contract Amount $ 3 618,309 27 Net Change in Contract Time of Completion No Change Revised contract time of completion June 29, 1988 Recommended by FREESE AND NICHOLS, INC By Approved by OWNER By Approved y CONTR By CHANGE 01 EXTRA N0RK 01DEI PROJECT: Denton Water Treatment Plant Upgrade - Phase 2 CONTRACT: No 9657 OWNER: City of Denton, Texas CONTRACTOR: Tonto Construction Cc CHANGE ORDER NO Seven (7) DATE November 9, 1987 CHANGE OR EXTRA WORK TO 09 PERPOR M Modify the roof drain system for the operations building as shown on the attached drawings Amount to be Added S 3,204 25 The compensation agreed upon in this Change or Extra Work Order is a full, complete and final payment for all costs the Contractor may incur as a result of or relating to this change whether said costs are known unknown, foreseen or unforseen at this time including without limitation, any cost for delay, extended overhead, ripple or impact cost, or any other effect on chanqed or unchanged work as a result of this Change or Extra Work Order Previous Contract Amount $ 3,648,111 41 Net Increase in Contract Amount 3,204 25 Revised Contract Amount $ 3,651,315 66 Net Chance in Contract Time of Completion No Change Revised contract time of completion June 29, 1988 Recommended by Approved by OWNER FREESE AND NICHOLS, INC ey BY ADprovpd by CONTO By CHANGE OR EXTRA WORK ORDER PROJECT: Denton Water Treatment Plant Upgrade - Phase 2 CONTRACT: No 9657 OWNER. City of Denton, Texas CONTRACTOR: Tonto Construction Co CHANCE ORDER NO. Sight (a) DATE November 17 190 CHANCE OR EXTRA WORK TO BE PERFORMED 1 Furnish and install three (3) 24" x 24" Milco style "K" access doors in the ceiling of the chemical building Amount to be added S 300 00 2 Modify backflow preventer vault and installation of backflow preventer as shown on attached copy of revised sheet CB-1 Amount to be added Days to be added 3 Delete raw water sample pump Amount to be credited $ 1,571 u5 s S jbl 00 4 devise test procedures for the Allis-Chalrers horizontal split-case pumping unit to have manutacturer witness pump test and provide certitied test curves for approval prior ro shippinq pump Test is to be oertormed with a factory calibrated test motor amount to ne credited $ 5U0 00 5 Delete 2 " vacuum breaker trom the dilution water line or the sodium hydro.cide tank Amount to be credited $ 175 00 6 Add unions, flange bolt connections and quick disconnects in heat tracing on chemical lines for sodium hydroxide, ferric sulsate fluoride, and potassium permanganate at bends as follows Union/Flange Size Number Unit Price Amount 4 inch 19 73 19 $ 1,390 61 2 inch 44 46 89 21063 16 1-1/2 inch 61 42 16 J,571 76 1 inch 5 35 57 177 85 Quick Disconnects 26 56 92 1 479 9.2 Amount to be added $7 683 30 Days to be added 3 The compensation agreed upon in this Chance or Extra Bork older is a full complete and rinal payment ror all costs the Contractor may incur as a result of or relating to this chance whether said costs are known unknown toreseen or unforseen at this time including without limitation any cost for delay, extended overhaad ripply or impact cost or any other ettect on chanced of unchanged work as a result of this Change or Extra Work Order Previous Contract Amount Net Increase in Contract Amount Revised Contract Amount Net Chance in Contract Time of Completion Revised contract time of completion Recommended by FREESE AND NICHOLS By _ Approved by CITY OF DENTON INC Date S s 651 J15 6b 6 5L0 15 $ J b5y ssS di b clays Jlly ~ 1`ldts Approved by TONTO CONSTRUC ON INC 1!e By - - - - - - Date PAGE 1 EXCERPT PUBLIC UTILITIES BOARD MINUTES December 16, 1987 6 CONSIDER CHANGE ORDER 547, & 8, DENTON WATER TREATMENT PLANT UPGR4DE - PHASE II, IN THE AMOUNT OF $121978.25 Ham presented this item with a short review of the change order requirements. Chew made a motion to recommend to the City Council approval of this change order Second by LaForte, all ayes, no nays, motion carried.