The URL can be used to link to this page

Home My WebLink AboutC2014-192 - 7/29/2014 - Approved r. CEIVED CHANGE ORDER Department of Engineering Services (City of Corpus Christi, Texas CHANGE ORDER NO: 4 FUNDING SOURCE: 4248-150725 Operating Department: Wastewater DATE: June 9, 2014 Name of Project: Allison WWTP New Mech. Bar Screen and Grit Removal Improvements City Project No. 7417 Contractor: R.M. Wright Construction Co. CHANGE ADD Deduct Add or Deduct the following items to the contract: See Attached Breakdown 1. East Aeration Basins cleaning and aeration system rehabilitation. $296, 169.09 2. Removal of excess grit from Grit Removal Unit. $49,034.80 3. Deduct unused quantities to adjust for final. ($12,865.00) 4. Add additional quantities for widening and extending driveway to New Mech. Bar Screen Unit and extending retaining wall. $16,559.00 E7417CWR$348,897.89 TOTAL ADD: $348,897.89 550910-4249-00000-150725 Why was this change necessary? (If left off the plans and specifications explain why?) W. Aeration rehab'd in original scope and E. Aeration needs the same. Between design and construction the grit basin filled with grit and contract did not account for the additional quantity. Staff requested wider and longer concrete driveway for better access to screenings containers. How can similar changes be avoided in the future? Unavoidable. Problems and issues not determined until construction was underway. A. CONTRACT PRICE $ 2,772, 662.00 B. TOTAL CHANGE ORDERS (inc. current) $ 509, 198.89 ■ C. NEW CONTRACT PRICE $ 3,281, 860.89 1/1. 4 D. THIS CHANGE ORDER $ 348, 897.89 - E. PERCENT TOTAL CHANGE (B/A) 18.40 Ail NMIt't Project Manage F. PREVIOUS TIME AUTHORIZED 76 C.D. ■ G. ADD'L CONTRACT TIME THIS CHANGE ORDER192 C.D. ■ H. TOTAL ADDITIONAL TIME 268 C.D. / CITY OF CORPUS CHRIST , TEXAS CONTRACTOR By: �a.�,64 1t TI 0•/// By: I►,J Director of E gi ering Services Title: D l,5/ , /,/mil - .u � ►, APPROVED�=',��/� Operating Department I,0 CettAICIL 411411,01,, Director of Management & Budg Legal Department F-. J 2014-192 - I • �� 7/29/14 ATTEST. ' ' �� M2014-100 REBECCA HUERTA INDEXED CITY SECRETARY R.M.Wright Construction Co. CHANGE ORDER NO.4 ATTACHMENT June 9, 2014 ALLISON WWTP MECH BAR SCREEN -CITY PROJECT NO. 7417 DESCRIPTION QTY. UNIT UNIT PRICE AMOUNT EAST AERATION BASIN IMPROVEMENTS 1. Bonds, Insurance, Labor, Overhead 1 LS $163,885.00 $163,885.00 2. Clean Six Existing Aeration Basins 1 LS $74,955.00 $74,955.00 3. Reinstall Missing Air Drops to Air Piping [1] 47 EA $176.85 $8,311.95 4. Provide New For Missing Air Drops[2] 15 EA $400.00 $6,000.00 5. Replace Air Drop Tees/Orifices with New 20 EA $150.00 $3,000.00 6. Provide New Lower Diffusers if Missing 20 EA $37.50 $750.00 7. Replace Air Drop Lower Clamp Supports 150 EA $26.67 $4,000.50 8. Reinstall Air Drop Lower Clamp Supports 75 EA $10.00 $750.00 9. Replace Existing Air Drop Lower Support Angle 426 LF $26.55 $11,310.30 10. Replace Existing Air Drop Wall Support Angle 66 EA $160.61 $10,600.26 11. Replace 8"Air Piping Couplings 24 EA $366.67 $8,800.08 12. Haul Off Solids from Aeration Basins 50 Tons $29.12 $1,456.00 13. Landfill Disposal Cost 50 Tons $47.00 $2,350.00 EAST AERATION BASIN REHAB SUB-TOTAL $296,169.09 [1]There are 47 air drops counted as missing. [2]Provide and install new air drops for those not found in tank or at the plant. REMOVAL OF EXCESS GRIT FROM GRIT REMOVAL UNIT 1. Equipment and Labor to Remove Excess Grit 1 LS $22,474.00 $22,474.00 2. Haul Off Excess Grit from Grit Removal Unit 340 Tons $31.12 $10,580.80 3. Landfill Disposal Cost 340 Tons $47.00 $15,980.00 EXCESS GRIT REMOVAL SUB-TOTAL $49,034.80 DEDUCT THE FOLLOWING BID ITEMS FROM THE CONTRACT 6. 4"Thick Sidewalk -123 SF $5.00 ($615.00) AAA2-4 Replace Air Drop Tees/Orifices with New -20 EA $200.00 ($4,000.00) AAA2-5 Replace Air Drop Lower Clamp Supports -150 EA $55.00 ($8,250.00) DEDUCTED QUANTITIES SUB-TOTAL ($12,865.00) ADD THE FOLLOWING BID ITEM QUANTITIES TOTHE CONTRACT 7. Lime Stablized Subgrade 61 SY $9.00 $549.00 8. 6"Thick Concrete Pavement 65 SY $60.00 $3,900.00 9. 6" Block Curb 4 LF $15.00 $60.00 10. Retaining Wall 5 LF $250.00 $1,250.00 AAA2-3 Reinstall Missing Air Drops to Air Bridges 14 EA $150.00 $2,100.00 AAA2-6 Reinstall Air Drop Lower Clamp Supports 174 EA $50.00 $8,700.00 ADDED QUANTITIES SUB-TOTAL $16,559.00 CHANGE ORDER NO.4 TOTAL $348,897.89 S:\Projects\15000UP\16445\8100\CONSTRUCTION\Change Orders\CO#4-E.Aeration&Grit\CO#4 Cost Prop.rev1 06.09.14.xls Page 1 of 1 w L._ I, 7 1 u RBAN Job No. 16445.B1.00 ENGINEERING I .kale 12,2014 TRANSMITTED VIA EMAIL ;---, .. _ _ ,_�_� AND ORIGINAL MAILED Mr.Abed Pardo, P.E. City of Corpus Ctwisti 4917 Hay Rd i' i Corpus Christi,.Tx 78411 ;.: ` 1� 7�' ..__ Subject Allison IIMWTP Bar Screen 8 id Grit Removal Improvements City P�roiec _No.741_7 Dear Mr. Pardo; Attached please find fair(4) sets of Change Order No. 4 for the subject project. Each has been signed by the contractor and myself. This change order involves the following: 1. East Aeration Basins: Draining and deaning completely all five basins and rehabilitating the aerations system. The amount of solids in the existing basins is unknown. The Contactor will be paid for the actual amount of tons hauled and disposed of. 2. Excess Grit Removal: During the design phase the Grit Basin was drained and there was some grit observed in the bottom but the hopper bottom was not full. The Contract Documents did not indicate that the Contractor would have to deal with more than normally expected amount of grit in the basin. When the Grit Basin was taken out of service it was found that the hopper bottom was completely full and the grit stacked halWay up the rertkiklifla basin (approx. 8' deep above the hopper). It took them more than a week to remove all the grit to the send drying beds. We calculated the total volume of grit remixed to be approx.. 400 tons and have deducted 60 tons for the hopper bottom that the cox*ador would have had to take we. That leaves 340 tons above what was anticipated. The Contractor ctor wil be paid for the actual amount of tons hauled and disposed of: 3, Deduct Unused Quantities: There are some quarties that were not used on this project. 4.. Add Quantities:. Items 7 to 10 were added quantities at the request of the Wastewater Dept. (at the time)to widen and extend the concrete driveway that provides access to the debris containers located tinder the New Mechanical Bar Screen structure. AAA2-3 and AAA2-6 were additional quantities necessary to complete the motion of the West Aeration Basin aeration system (they were done instead of items AAA2-4 and AAA2-5 noted in Item No.3 above). Not included in Item No. 3 its$883.93 remaining in the Utility Allowance. We have left that as available in ces a there we in minor issues that arise from the East Aeration Basin work. ovigiNatoit 27215.SWANT1 DR..•CORPUS Mil ISk TEXAS 78404 FAX OM 4401 w . >ite'E Fkm#t4 niPtS Firm#10032400 • A 1L t L P. AIM 12,2S T 2 We at the additiorml time naiad at the change order based on what we believe is the oil*misfire contract time as provided in the*Amin ttt aind Told COrdract Tae. 455 Calendar Days AddiiioiM TIme by Ctnnpe Order: -ZtrelifillOSEDIre Total Time Aulhorizet 531 Calendar Days (hough Charge Order No.3) November 5,2012= Contract Time Started Apt 200 2014: Contract Time Ended(atter 581 C.D.$) Anticipating Canon approval by July 22,2014 and three months for construction(through Oct 20,2014)amounts to 192 a611Sonal calendar days. Total additional days, including previous change orders.is than 268 Calendar Drys. Should you have any questions please cal me. Anyl i g we can do to expedite the charge order Wand be appreciated. The Contractor has finished his original scope of veark and he has left his equipment on site antidpati'Ki approval cilia East Aeration Basin work Snow*, URBAN ENGINEERING ibt•A- Mark Maroney, P.E irlt Enclosure xc kirk Guerra,P.E.—Construction Services Wend.vie enrol Janes H.nis.P.E.--Capital Pnoprams wend.vie unwal Daniel Deep.P.E.-Capitol Programs Wend.via enrol Raft VMOtel,liM Moat Construction via enrol