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HomeMy WebLinkAboutItem 3g: Accept Work by Downing Construction for Water Main Transmission Extension on Colorado Street as Complete OF AID 4 1 '.4,0' C.) "119111 II7 `re:"' i t7:110 oo\ i�6 44'4n«Ynit STAFF REPORT Public Works Services Department DATE: December 6, 2011 TO: Mayor and City Council FROM: Tom Tait, Public Works Services Director Prepared by: Ken Herman, Deputy Public Works Services Director Mark Rynkiewicz, Associate Civil Engineer SUBJECT: ACCEPT ALL WORK PERFORMED BY DOWNING CONSTRUCTION, INC. FOR THE WATER TRANSMISSION MAIN EXTENSION ON COLORADO STREET PROJECT AS COMPLETE AND AUTHORIZE THE FINAL PAYMENT TO BE MADE IN ACCORDANCE WITH THE CONTRACT DOCUTMENTS Recommendation: Approve SUMMARY On May 17, 2011, the City Council awarded a contract to Downing Construction, Inc. in the amount of $223,287 for the construction of the Water Transmission Main Extension on Colorado Street. The terms and conditions of this project have been complied with and the work has been performed to staffs satisfaction for a total project cost of $228,118.56. This amount reflects the original contract amount of $223,287 plus one (1) contract change order totaling $4,831.56 or 2.2% above the original contract amount. Staff recommends that the City Council accept all work performed by Downing Construction, Inc. as complete and authorize the final payment to be made in accordance with the contract documents, subject to retention of $22,811.86. DISCUSSION Recommendations made in the 2008 Water Master Plan Update included identifying areas in the City's water distribution system that reduce system pressure losses and improve fire flow demands. On Colorado Street between Baldwin Avenue and the City limits is an area that meets theses requirements. Adding a section of water main in this area will provide a more even distribution of water in the distribution system and help to reduce system pressure losses. The transmission main extension project on Colorado Street involved the installation of a twelve inch (12") ductile iron pipe along Colorado Street from Altura Road to Vaquero Road and a tie-in to the existing eight inch (8") water main on Catalpa Road. Mayor and City Council December 6, 2011 Page 2 During the excavation phase of work, the contractor encountered asphalt paving that was thicker in some areas than was anticipated on the plans. Although Colorado Street was potholed during the design phase to determine the asphalt thickness, the actual thickness varied and was not known throughout the entire length of the project. The extra work to cut, remove and dispose of the extra asphalt was covered in one (1) contract change order. The following reflects the change order associated with the project: CCO # Description Amount 1. Compensation for additional asphalt work due to $ 4,831.56 additional asphalt thickness that was not anticipated Total Change Orders $ 4,831.56 Staff recommends that the City Council accept all work performed by Downing Construction, Inc. as complete and authorize the final payment to be made in accordance with the contract documents, subject to retention of $22,811.86. This amount reflects the original contract amount of $223,287 plus one (1) contract change order for $4,831.56 or 2.2% above the original contract amount for a total contract amount of $228,118.56. ENVIRONMENTAL IMPACT This project consists of minor alteration of an existing public utility system with no expansion of the system and therefore qualifies as a Class 1 categorical exemption per 15301 (b) of the California Environmental Quality Act. FISCAL IMPACT Funds in the amount of $320,000 have been budgeted as a part of the 2010-11 Capital Improvement Program for the Transmission Main Extension on Colorado Street Project. RECOMMENDATION 1. Accept all work performed by Downing Construction, Inc. for the Water Transmission Main Extension on Colorado Street project as complete. 2. Authorize final payment to be made in accordance with the contract documents, subject to retention of$22,811.86. Approved by: ,, ,`P,2w, Don Penman, City Manager TT:KH:MR Attachment: Location Map— Exhibit"A" Page 2 of 2 TRANSMISSION MAIN EXTENSION ON COLORADO STREET 1, s � " rACL IN ,G • 0 NORTH Z \G'`�,y CITY OF ARCADIA ri f' ELKI`S GRAND VIEW -1-,.., __( :,, ♦•:",, PROJECT LOCATION °P COLORADO ST. BETWEEN sIE_ •DREBL a =.° ALTURA RD. &VAQUERO RD. b y e W A itORANGE GROVE ,.� ° •• . : • .............., ___ _ _ mg : ____ old* i � tt ..; � � - 1 C., MA K �.•� \R_sSW O PARK ■ -®� 1 - _I gir '(i•, 1y F titi Irdill r / F:T�...� _ ' oo• oaA6E I u. ¢ ¢ RD y D UA0.TE z o Oa 111111111 N + z¢ 1u•• REAL ¢ CAMINO REAL\1 a O IIE• J teLONGD ;r : . . __ TUNAS DR �� � I • 1® t` .11%,p4 • 5• D 5•• LOCATION MAP NOT TO SCALE