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HomeMy WebLinkAbout1994-005e:\wpdocs\ord\chgorder.o ORDINANCE NO. 7 -� AN ORDINANCE AUTHORIZING THE EXECUTION OF A CHANGE ORDER TO A CONTRACT BETWEEN THE CITY OF DENTON AND GRACON CONSTRUCTION COMPANY; PROVIDING FOR AN INCREASE IN THE CONTRACT PRICE; AND PROVIDING AN EFFECTIVE DATE. WHEREAS, on July 21, 1992, the City awarded a contract for the construction of certain improvements to Pecan Creek Wastewater Treatment Plant in the amount of $8,647,000.00; and WHEREAS, the City Manager having recommended to the Council that a change order be authorized to amend such contract with respect to the scope and price nsaid change compliance with ther qui ements ot Chapter252of order being theLocal Government Code; NOW, THEREFORE, THE COUNCIL OF THE CITY OF DENTON HEREBY ORDAINS: SECTION I. That the change order increasing the amount of the contract between the City and Gracon Construction Company, a copy of which is attached hereto, in the amount of Forty-six Thousand Dollars ($46,000), is hereby approved and the expenditure of funds therefor is hereby authorized. SECTION II. That this ordinance immediately upon its passage and ap''' PASSED AND APPROVED this the ATTEST: JENNIFER WALTERS, CITY SECRETARY BY: APPROVED AS TO LEGAL FORM: DEBRA A. DRAYOVITCH, CITY ATTORNEY BY: shall become effective DATE: JANUARY 4, 1994 CITY COUNCIL REPORT TO: Mayor and Members of the City Council FROM: Lloyd V. Harrell, City Manager SUBJECT: CHANGE ORDER # 19 FOR WASTEWATER TREATMENT PLANT (GRACON CONSTRUCTION -- P.O. # 26052A) RECOMMENDATION: Council approve change order #19 in the amount of $46, 000.00 to Gracon Construction Inc. for the Wastewater Treatment Plant Improvement contract. SUMMARY: This change order is for the installation of two (2) grinders, one on each grit pump at the suction pipe. These grinders cut into fine pieces any debris which clogs the grit pumps and degritter equipment. (See Public Utilities Board Agenda Item memo dated 12-15-93 for more detailed information) . BACKGROUND: Public Utilities Board Item Memo, Change Order #19. PROGRAMS DEPARTMENTS OR GROUPS AFFECTED: Wastewater Treatment. FISCAL IMPACT: The project cost to date including Change Order #19 is still 19.7% under the total budget for the plant upgrade and expansion. 4Ll�espect llyoyd V . Harrell City Manager Approved: Name: Melanie Harden Title: Buyer aganda.442 CHANGE ORDER [CO] Page 1 of 3 PROJECTi Pecan Creek wNTP Imarovameats PMROae=C-�_.'T aMV9ty) OWNER: CITY OP DBN'PON. TEXA@ ENGINEER: Alap P}tom �" sad Anooiatoa xna._ Engineeri457-0425 (APAII CONTRACTOR: G aeon „goaetrua tion Comnanv CoDates DOO 91, 1993 CHANGE ORDER: 19 _ Date: - - F pansation agreed upon in this Change Order is a full, complete and final payment for whaall g to rs]a�own�ntractor incUrs an a unknownforeseen orresult of ualoreseanrat thisntime,tincludinis gewithouter said onnahanged orsunahaage8for yworkta�dadr�� lteoi�thi�ple or ahangeimpa0t cost, or any other CHANGE ORDER WORE TO BE PERFORMED P,Yonoeed Ccntraat u..n=qa«_ion Time ar«ens±on/Dave Amount1. REFERENCE PCM NO - This Proposed Contract Modification is for two (2) grinder pumps in auction Pipes Of two (2) grit PUMPS at the Flow 8plitter/Grit Removal j structure. Theca two (2) grinder pampa will Solve the problem of stringy debris in raw sewage stopping up these pipas 0 $46,000.00 and degritter equipment. TOTAL 0 Calendar Days $46,000.00 Distribution: 457-0425 D.22 497-0420 D.22 Joe Graves Gracon Construction Ron Janson Gracon Construction Dave Ram Consultant Purchasing City of Denton Finance City of Denton R.E. Nelson City of Denton Lee Allison City Of Denton xhibit I CHANGE ORDER [CO] 2 Page of 3 Ilan Plummer and Associates Engineer's Estimate $11,000.000.00 Original Contract Amount (Gracon Construction Co.) $8,647,000.00 New Increase or Decrease <> in Contract Amounts: Previous Change Order No. 1 <$ 6,125.00> Previous Change Order No. 2 <$ 9,640.97> Previous Change Order No. 3 $ 2,982.00 Previous Change Order No. 4 <$ 4,950.83> Previous Change Order No. 5 $ 71,187.00 Previous Change Order No. 6 $ 9,980.00 Previous Change Order No. 7 $ 6,196.00 Previous Change Order No. 8 $ 34,424.00 Previous Change Order No. 9 $102,000.00 Previous Change Order No. 10 $ 5,790.00 Previous Change Order No. 11. $ 8,194.00 Previous Change order No. 12. $ 4,726.00 Previous Change Order No. 13. $ 4,628.00 Previous Change Order No. 14. $ 4,740.00 Previous Change Order No 15 $ 9,545.00 Previous Change Order No. 16 $ 4,900.00 Previous Change Order No. 17 $ 3,490.00 Previous Change Order No. 18 $ 9,785.00 This Change Order No. 19 $ 46,000.00 Total of Change Orders $307,850.20 Revised Contract Amount $8,954,850.20 Net Change in Contract Time 0 Calendar Days Revised Contract Completion Time 720 Calendar Days Percent Change Orders per Original Contract Amount 3.56% Attached: PCM 106 CHANGE ORDER [CO] xecotmended by Approved by Contractor Consulting Engineer: g3.Z� f fo'- � f acan Coastruct_on Inc -- and Associates, Inc. Date: Approved by Engineering Administrators By �.xa■ for ity of Denton, Approved by Purchasing Agsat Hy for City of lantea, Texas Approved by Director at Water Engineering and Operations By for City of Denton, Texas Approved bycutiv Dire r of Utilities BY to City of Denton, Texas AEtc Aci ty Cc 8 WI 3 Page of 3 ($5,001 - $19,999) City Manager and above) James L. Ahstaener, P.E. Aim Plummer John H. Cook, P.E. Peggy W. Glass, Ph.D. mid Associates, Inc. Alan H. Plummer, Jr. P.E. Richard H. Smith, P.E. ENVIRONMENTAL/CIVIL ENGINEERS 457-0420/2 December 2, 1993 Mr. Gerald P. Cosgrove, P.E. Water/Wastewater Utilities City of Denton 901-B Texas Street Denton, Texas 76201 Re: Pecan Creek Wastewater Treatment Plant Grit Structure Grinders Dear Mr. Cosgrove: During the operation of the new Grit Structure, the grit pump check valves and grit cyclones have several times become entangled with rags and other stringy material passing the bar screen and, the piping and equipment has to be taken apart and cleaned. Previously these solids were collected at other locations on - site such as the primary sludge pumps, the gravity sludge thickeners, and the anaerobic digesters, and have caused maintenance problems at these locations. The original design of the grit structure had all of the grit washing water being discharged into an existing sewer line on the plant site. All rags and other stringy material removed in the grit units were returned to the front of the plant. The material then had to repass through the bar screens where some of it could be removed. However, the existing sewer line would at times backup flow into the foreman's offices due to the additional flows from the grit structure. The grit washing water was repiped to discharge back into the front of the grit structure. This has inadvertently resulted in all the rags and other stringy material being continuously recycled through the grit structure until the piping and grit cyclones became clogged. After evaluating many options for remedying this problem, we recommend that two grinders be installed in front of the grit pumps to grind the rags into such small particles as not to create additional problems. The grinder blades will likely require replacement every 12 months or so. This option is less expensive than installing a new drain line from the grit structure to the raw sewerage lines into the plant. We have reviewed the various options available and our recommendation with the plant operation staff and engineering staff, and they concur with this approach. Please let us know if you have any questions or require any additional information on this matter. Sincerely, ALAN PLU�ER AND ASSOCIATES, INC. A. Lee Head, III, P.E. ALH:mds cc: Mr. David Ham, P.E., Consultant, City of Denton Mr. Lee K. Allison, City of Denton Mr, Howard Martin, City of Denton Mr. Clete Martin, Resident Project Representative, Alan Plummer and Associates, Inc. File 457-0425 C.2 File 457-0420 C.2 457042Ww sr »Jte 210 West Sixth Street • Suite 400 • Fort Worth, Texas 76102-4803 0 (817) 332-4085 • Metro (817) 429-9567 • FAX: (817) 338-4626 `v'' Alan Plummer ally AS$ockiltesls hw. ENVIRONMENTAL/CIVIL ENGINEERS December 3, 1993 Mr. Ron Janson Project Manager Gracon Construction, Inc. P.O. Box 850756 Mesquite, Texas 75185-0756 James L. Ahstaetter, P.E. John H. Cook, P.E. Peggy W. Glass, Ph.D. Alan H. Plummer, Jr. P.E. Richard H. Smith, P.E. Re: City of Denton Pecan Creek Wastewater Treatment Plant Improvements Job No. U102 PCM No. 106 - Grit Structure Grinder Dear Mr. Janson: Please price the purchasing and installation of two (2) grinders on the suction side of the grit pumps and valves at the grit structure consistent with the piping configuration and electrical/instrumentation controls attached. Coordination and work from other trades, including painting, will be required. Please sign, date, and return the attached PCM form along with a cost breakdown for this work. Sincerely, ALAN PLUMMER AND ASSOCIATES, INC. Cletus R. Martin Resident Project Representative CRM:sm Attachment cc: Mr. Dave Ham, P.E., Consultant Mr. A. Lee Head III, P.E., Alan Plummer and Associates, Inc. File 457-0425 D.20 File 457-0420 D.20 3CM102.wp 210 West Sixth Street • Suite 400 0 Fort Worth, Texas 761024803 0 (817) 332-4085 • Metro (817) 429-9567 0 FAX: (817) 338-4626 DEC 02 '93 02:35PM CP&A DALLAS P.2i3 Chiang, Patel and Associates, Inc. 7j Consulting Engineers December 2, 1993 Mr. Clete Martin, P.E. Alan Plummer & Associates, Inc. 210 W. 6th Street, Suite 400 Port Worth, TX 76102 RE: Pecan Creek Water Reclamation Plant Electrical and Instrumentation requirements for Grinder Installation. Dear Clete: In regard to the above mention the following items should be included in the PCM for operation of the proposed grinder system. Grit Pump starter modifications, removal eagle timer, provide a 0-5 second time delay relay to energize in such away that the grinder will be started, it will send a start signal to the grit pump, after a time delay (3 second) the grit pump will start. Grinder Power, shall be from MCC-GR cubicles, GR-D1R and GR-D2R spare 20A/3P breakers. Provide 2-1" conduits from MCC to south wall of enclosure overhead, route down inside of wall, then thru wall at floor. Route conduits exposed on concrete, then concrete encased underground to grit structure. Conduits shall then be route exposed to grinder control panels. Each conduit shall contain 3#12,#12g. power, 2#14 to grit pump, 6#14 to termination panel for SCADA system. Grinder Pump Starter, shall be manufacturer's standard NEMA 4X panel, except provide a Hand -Off -Auto switch, a remote start contact from the SCADA system in the Auto position, 2 normally open run contacts, one for monitoring to the scada system one for start/stop of the grit pump, one normally open malfunction contact for remote monitoring to the SCADA system. Mount control panels on aluminum switchracks. btstramentation modifications, provide 4 digital input points for grinders run and malfunction status, 2 digital output points for grinder start/stop control from the Belt Press Building LPU. The graphic screen shall be change to include these grinders as well as a timer function, operator will select a amount of time to run every hour. CDE91 i6dD/CMARIND.bTRIKSM REGAL CENTER I, 8828 STEMMONS FREEWAY, SUITE 410, DALLAS, TEXAS 75247 - 1,.. P.3/3 DEC 02 '93 02:3EPM CP&A DRLLRS Mr. Clete Martin, P.E. December 2, 1993 Page 2 Please call if you should have any questions concerning this matter, Sincerely yours, CHIANG, PATEL AND ASSOCIATES, INC. A Patrick N. Moseley, P.E. Project Engineer PNM/rsm ITE9115.1UiCM ftIIJD.LTkRfhhl Alan Plummer and Associates, Inc. ENVIRONMENTAL/CIVIL ENGINEERS JOB NAME_ JOB NO. CALCULATED BY. VERIFIED BY_ MS-7-Dj To SSE GhKI�GES SHoWTs 6�-��.J l� U f�GCon►�IC>URE FN46Tl06- ('11�I�U5► Au- �11f1►�lrs � IIf1Lt1ES 6��IA, 11 flew vmfY (.ENefti DF rtw- SfML- nee ® P2a/ID� PIPE z�E4wP, sorP�is Ir5 Rev. pt,O& VftLVF,5 a (� 6,R1NDEF, ME 'A 4/� TYP. 201 N J40 46. / 1- im \ 1 16.4' TYP L e C G F C D 6" E H F G O� /- #5@12"c /c /I E.W.. E.F. v OVERHEAD SEAL WATER LINE TO PUMPS COLUMN F7 _ 6' ER, _= W W v 6„ lbi El M 8!-6" R. _202 TYP. i � PROPOSED CONTRACT MODIFICATION [PCM]7-7 OWNER CITY OF DENTON I.PROJECT No, PROJECT PECAN CREEK WWTP IMPROVEMENTS OWNER U102 CONTRACTOR GRACON CONSTRUCTION INC. CONTRACTOR ENGINEER ALAN PLUMMER AND ASSOCIATES, INC. ENGINEER 457%-0425 RESIDENT REPRESENTATIVE CLEl'E MARTIN pCM No 1� NOTIFICATION TO CONTRACTOR, R� WE ARE CONSIDERING MAKING THE CHANGE TD THE CONTRACT DESCRIBED IN THE ATTACHED MATERIALS AND REQUEST THAT YOU TAKE THE FOLLOWING ACTIONt ❑ NOTIFY US THAT YOU CONCUR THAT THIS CHANGE GOES NOT REQUIRE A CHANGE IN CONTRACT TIME OR AMOUNT. A FIELD ORDER WILL BE ISSUED. �a)BMIT A PRICE PROPOSAL WITH DETAILED COST BREAKDOWN AND REVISED SCHEDULE FOR PERFORMING THE THE DESCRIBED CHANGE. ❑ A CHANGE ORDER WILL BE ISSUED FOR PAYMENT AT THE UNIT PRICE an / © PRO D TIME AND MATERIALS PROVISIC 3 OF C1 ,0 0 f7RACT. BY: DATE: CONTRACTOR'S RESPONSE: WE RESPOND TO YOUR REQUEST AS FOLLOWS ❑,/WE CONCUR THAT THIS IS A NO COST OR TIME CHANGE. ISSUE FIES.D ORDER. L1 WE SUBMIT THE ATTACHED PRICE PROPOSAL 'MTH COST BREAKDOWN AND IRE"M!D" sE FOR PERFORMING THE DESCRIBED CHANGE ❑ WE ARE PRW=INO WITH THE CHANGE AT THE UNIT PRICE BID. ❑ WE ARE PROCEEDING WITH THE CHANGE UNDER THE TIME AND MATERIALS PROVISIONS OF THE CONTRACT. BY: o n � DATE: H Z- z- 43 ACTION TAKEN: ❑ PROPOSED CONTRACT MODIFICATION REJECTED. CONTRACTOR NOTIFIED NOT TO PROCEED. BY: DATE: © FIELD ORDER ISSUED: N0. � DATE: BY: ANCE ORDER ISSUED: NO. �.LJ-- DATE: 9Y rpm —PN P�lCB �prHDr, y(v) DOD. ego