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HomeMy WebLinkAboutUtilities 2007-08-08 Item 3D - Change Order #1 - Westfield Shoppingtown North Sewer Repair with Construct CompanyINFORMATION MEMO To: Mayor Mullet From: Public Works Director Date: July 30, 2007 Subject: Westfield Shoppingtown North Sewer Repair Project No. 06 -SW04 Change Order Number 1 and Budget Shortfall attachments: Exhibits A and B ISSUE Change Order Number 1 in the amount of $120,000 brings this project over budget. BACKGROUND The Notice to Proceed for Contract No. 07 -063 with Construct Co. of Sumner, WA was issued on May 14, 2007. This project repaired the sanitary sewer line on the north side of Westfield Mall. A section of the City-owned sanitary sewer line near Macy's had settled which caused a low spot in the sewer line. The Developer's Agreement required that the City repair the sanitary sewer before the sewer could be turned back to the Mall for ownership and maintenance This 20- calendar day contract was supposed to be substantially completed on June 3, however, due to massive utility conflicts the substantial completion was not achieved until July 3, 2007. Change Order Number 1 has been negotiated at $120,000.00 to cover the resolution of considerable utility conflicts and will be paid as Force Account (time and materials). The entire week of night work between Sunday May 20 and Monday May 28 was spent potholing and analyzing the extensive concrete encased power conduits found to be placed over the existing sanitary sewer. The power conduits were found to be secondary power, which was not located by PSE. Westfield was not aware of the location and did not know they were responsible to locate the power conduits. The sanitary sewer alignment had to be re- designed away from the power conduits. See Exhibit A (as -bid design) and Exhibit B (re- design). After potholing again for utility conflicts on the re- designed alignment on May 31, work began on the new alignment on Friday night, June 1 and the manholes and pipes were successfully installed June 7. The following week was spent re- connecting the side sewers to the mall, grouting manholes and cleaning up. ANALYSIS While this change order amount is very high, the amount of re -work and extra work was extraordinary. The change order includes additional compensation for: standby time waiting for the new design (the average daily standby rate for this amount of labor and equipment was $3,000); extended bypass pumping at over $4,100, the additional asphalt patching was almost $9,000; and the seven nights of potholing averaged $8,000 for each night. The Developer's Agreement with Westfield does not require Westfield to locate utilities for the City's repair work. However, the Agreement requires that Tukwila repair the sewer in order to accept all of the water and sewer system. This turnover will eliminate several days of maintenance per year. The contract award amount was $100,559.62 plus 10% contingency for a total of $110,615.58. The budgeted amount is $150,000. The final total contract amount is expected to be around $221,000.00 and the contract will be closed out after final payment. The $71,000 budget shortfall will be taken out of the ending fund balance for the sewer fund (402.02). RECOMMENDATION Authorize the Mayor to sign Change Order No. 1 for $120,000. \tuk2 volt \PUBWORKS\PROJECTS1A- SW Projects \061wO4 Westfield North Sewer Repaa\Jnfo Memo Westfield Change Order 1 Budget Overruadoc I+ c w G m ENTRANCE TO MAGY'S 23 NORM, RANGE 26 1-QWNSHIP OR MARH1 X10 C SEC-\O 1 A KING 6,oU�1 o� CM of EXISTING FORCE MAIN FROM PUMP STATION EXISTING MN 0 PUMP DISCHARGE P OINT TO M1-10 97 RIM =9 EXISTING B NvERT. UGPM T� PAsS ITHE 4 T iNG PROP TPUT IS 400 OU pL G MH AND P pBMEN coRE D G MH TO HOLE FOR 1�0EMAIN IN PLACE PI CORE DRILL MAN UM T THE EI LINE REPLA N SEWER PS 0 b 0 m 0 s Q C) X, FIRE VAULT EXTRUDED CONCRETE CURB O BUILDING VENT O ''ti° �j BUILDING VENT IN LINE EXISTING SIDE SEWER EXISTUJG 10 STORM ORA 10" PVC 0 I. PROPOSED 245�LF 12 p 'CLOCK s$D O 10 LINED COQ OT EXI SEWER CU RB LINE KISTING SIDE PROVIDE WYES 05 N 5 12 O'CLOCK SHAD 4,NE. MATCH ON_ TO THE FOOD COURT. SNcaeWER O _..��c t0 MALLAND_._ JOHNNIE ROCKETS RESTAURAs City of Tukwila OF TUKWILA STD. STD `DETAIL DS -14B NOIII 10" DIA. SDR INSTALLATION SALL BE INSTALLED PER P CITY OF TU WINAGE DURING 1. LL OR SOR S UMPG O OR HIS OR G THE LE •A EGNEER F ARKINGS DISTRU EECTL A pR &NMNNUS RUSO THE MA. TOR F `5/ D URII 15 HURS IGGG O CH SHALL BE BACK TED AND PINNED CORE DRILLING PL. 7 THE TREN SPHALT OF SEWER LINE. 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