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Home My WebLink About2007-09-11; City Council; 19154; Buena Vista lift station forcemain VC410 CITY OF CARLSBAD - AGENDA BILL \^|p5/ AB# 19,154 MTG. 9/11/07 DEPT. ENG AUTHORIZATION TO APPROPRIATE FUNDS FOR BUENA VISTA LIFT STATION FORCEMAIN (VC4) S^ DEPT. HEAD S) ®v$- CITYATTY. l^> CITY MGR. <r~l^>T*V RECOMMENDED ACTION: Adopt Resolution No. 2007-235 authorizing the appropriation of funds for the Buena Vista Lift Station Forcemain (VC4). ITEM EXPLANATION: Background - The forcemain, originally constructed in 1963, conveys wastewater from the Buena Vista Lift Station to a gravity interceptor sewer located west of Interstate 5. This forcemain is part of the Vista/Carlsbad Interceptor Sewer system, and is referred to as Reach VC4. The forcemain is jointly owned by the City's of Vista and Carlsbad. Through an agreement with the City of Vista, dated February 26, 2003, Carlsbad is responsible for operation and maintenance. The original forcemain was 16-inch diameter asbestos cement pipe (ACP) located entirely within Jefferson Street. When Interstate 5 was constructed around 1968, a new bridge overpass was built for Jefferson Street and a two barrel pipeline, consisting of 16-inch diameter ACP, was constructed in the bridge. The original forcemain was connected to one pipe barrel in the bridge. Around 1970, two 16-inch diameter reinforced plastic mortar pipes (RPMP) were constructed to replace the easterly-most portion of the original ACP forcemain because of a realignment of Jefferson Street. One of the RPMP pipes was connected to the original 16-inch diameter ACP forcemain. In 1975, a 24-inch diameter ductile iron pipe (DIP) was constructed in Jefferson Street in parallel to the original ACP forcemain. On one end, the 24-inch DIP connected to the other 16-inch RPMP pipe and the other end connected to the remaining 16-inch pipe barrel located in the bridge crossing Interstate 5. At that point in time, the forcemain consisted of two pipelines with one operating as a standby forcemain. Around 1982, the RPMP pipes were abandoned and a 24-inch diameter DIP was extended from the lift station west to the existing 24-inch DIP installed in 1975. A final modification to the forcemain occurred in 1996 with the installation of a wye connection with a plug valve to allow wastewater to be conveyed into the original 16-inch diameter ACP line. Forcemain Break - On April 1, 2007, a break occurred on the DIP portion of the forcemain constructed in 1982. The location of the pipe break is not in the lagoon, but follows the original alignment of Jefferson Street. FOR CITY CLERKS USE ONLY COUNCIL ACTION:APPROVED DENIED CONTINUED D WITHDRAWN D AMENDED D CONTINUED TO DATE SPECIFIC D CONTINUED TO DATE UNKNOWN D RETURNED TO STAFF D OTHER-SEE MINUTES D Page 2 The material specified for the pipe where the break occurred is 24-inch diameter ductile iron pipe (DIP) cement mortar lined, thickness class 51, with an 8-mil polyethylene encasement. An investigation into the pipeline break by a corrosion consultant indicates that the most probable cause of the break was due to external corrosion of the pipe at a hole in the polyethylene encasement which most likely existed at the time of construction. The iron corroded over a period of time, measured in years, down to the cement liner. The exposed area of the liner continued to grow in size as the supporting iron receded. The sewage was discharged when the membrane of cement liner, corrosion product, and supporting fill could not contain the pressure. Recommendation - Cathodic protection can be installed to halt further corrosion of the exterior of the existing forcemain. Although this would prevent further metal loss, there is still the possibility that there are similar areas along the forcemain where only the cement liner remains and, therefore, staff is recommending that the forcemain be replaced. The City has a future Capital Improvement Project (CIP) which calls for a parallel forcemain to be constructed to replace this existing pipeline. It is recommended that this CIP project be moved forward and staff begin the engineering design process. The project would consist of a parallel forcemain and also improvements to the existing forcemain including a slip liner, valve improvements, and redundancy features to enhance reliability of the forcemain delivery system. ENVIRONMENTAL IMPACT: This project is a Class 6 categorical exemption (information collection) and is therefore exempt from environmental review pursuant to Section 15306 of the California Environmental Quality Act (CEQA). A Notice of Exemption will be filed by the Planning Director upon project approval. FISCAL IMPACT: The Engineer's Estimate for the first phase costs of the Buena Vista Lift Station Forcemain Improvement Project is shown in Table 1. TABLE 1 ?V . - ' -:_, PROJECT Preliminary Design Report, Environmental Review and Permits Final Design, Plans and Specifications PROJECT .TOTAL, COST CURRENT APPROPRIATION ADDITIONAL APPROPRIATION REQUIRED ESTIMATED COSTS $200,000 $300,000 $500,000 -4&NONE $500,000* FUNDING SOURCE Sewer Replacement Funds *. s " - The actual cost will be split between the Cities of Vista and Carlsbad; 89.6% and 10.4%, respectively. Carlsbad will invoice Vista for their share of the work. The budget includes only the cost for the preliminary design report, environmental review, permits and final design. This project is not in the current Fiscal Year 2007-2008 CIP Program. Staff is requesting that an appropriation from the Sewer Replacement Fund be approved at this time to perform the work listed above. Sufficient funds are available in the Sewer Replacement Fund to accommodate the cost for the first phase of this project. Any recommended improvements for construction will be appropriated in the future based on the results of the preliminary design report. PageS From the agreement with the City of Vista, their share of the Preliminary Design Report for Reach VC4 of the Vista Carlsbad Interceptor Sewer system is 89.6 percent and Carlsbad's share is 10.4 percent. In accordance with Section 6.1 of the agreement between Vista and Carlsbad, a Preliminary Design Report is first required on a project detailing the improvements to be made and their associated cost. Upon acceptance of the findings in the Preliminary Design Report, a Project Agreement shall be prepared to identify specific improvements, including cost sharing. The Project Agreement must be approved and accepted by each agency before final design can begin. Staff at the City of Vista has indicated that they are in agreement with proceeding on this project at this time and will be making a recommendation to their City Council for full project funding. A Request for Proposal has been prepared for preparation of the Preliminary Design Report EXHIBITS: 1. Location Map. 2. Resolution No. 2007-235 authorizing the appropriation of funds for the Buena Vista Lift Station Forcemain (VC4). DEPARTMENT CONTACT: William Plummer, (760) 602-2768, bplum@ci.carlsbad.ca.us LOCATION MAP SITE NOT TO SCALE SITE PROJECT NAME BUENA LIFT STATION FORCE MAIN (VC 4) EXHIBIT 1 DRAWN BY: SCOTT EVANS. CARLSBAD ENGINEERNG DEPT. 8/30/07 C:\CAPITAL\AHLES\BUENA LIFT STATION FORCE UAIN.DWG 1 RESOLUTION NO. 2007-235 2 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF 3 CARLSBAD, CALIFORNIA, AUTHORIZING THE APPROPRIATION OF FUNDS FOR THE BUENA VISTA LIFT STATION FORCEMAIN (VC4). 4 WHEREAS, the City Council has determined it necessary and in the public interest to 5 prepare a preliminary design report, and appropriate funds for the Buena Vista Lift Station 6 Forcemain Improvement Project; and 7 WHEREAS, funds totaling $500,000 are needed at this time to begin this project. 8 WHEREAS, funds in the Sewer Replacement Fund are sufficient for the project; and 9 WHEREAS, an Agreement dated February 26, 2002, titled "Agreement for Ownership, 10 Operation and Maintenance of the Vista/Carlsbad Interceptor Sewer" calls for the City of Vista's share in the cost of the Preliminary Design Report to be 89.6 percent and Carlsbad's share to be 10.4 percent. 13 NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Carlsbad, California, as follows: 1. That the above recitations are true and correct. A O 2. That the Finance Director is authorized to appropriate $500,000 from the 17 Sewer Replacement Fund to cover the cost of a Preliminary Design Report, Environmental 1ft Review, Permits and Plans and Specifications for the Buena Vista Lift Station Forcemain 19 Improvement Project. 20 /// 21 /// 22 /// 23 /// 24 /// 25 /// 26 /// 27 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 PASSED, APPROVED AND ADOPTED at a Regular Meeting of the City Council of the City of Carlsbad on the 11th day of September 2007, by the following vote to wit: AYES: Council Members Lewis, Kulchin, Hall, Packard, Nygaard NOES: None ABSENT: None ATTEST: LORRAINE (SEAL) / , City Clerk