The URL can be used to link to this page

Home My WebLink About05/03/2011, C 4 - HIGHLAND STORM DRAIN REPAIR AND REPLACEMENT, SPECIFICATION NO. 91035 council " 6jDiMay3,2011 j, acEnaa mpoat a� CITY OF SAN LUIS OBISPO FROM: Jay D. Walter, Director of Public Works OW Prepared By: Manny Guzman, Engineer II SUBJECT: HIGHLAND STORM DRAIN REPAIR AND REPLACEMENT, SPECIFICATION NO. 91035 RECOMMENDATIONS 1. Approve plans and specifications for the Highland Storm Drain Repair and Replacement Project,a Measure - `/z cent sales tax funded project, Specification No. 91035. 2. Authorize staff to advertise for bids and authorize the City Manager to award the contract if the lowest responsible bid is within the Engineer's Estimate of$355,000. DISCUSSION Background A large portion of the City's storm sewer pipeline infrastructure is comprised of corrugated metal pipe (CMP). In the 1960s and 1970s CMP was the industry standard due to its inexpensive material cost, ease of installation and projected 50-year design life. In the City's experience, CMP has proven to have a design life of 20 to 30 years. CMP typically fails by friction from the action of flowing water with rocks'and sediment, corrosion or both. Once the integrity of the pipe has been compromised, the pipe's surrounding soil becomes susceptible to piping(soil picked up by flowing water and carried away) and the pipe will eventually collapse. The proposed project will address a failing CMP drain system on Highland and in easements over private property at 549 and 557 Highland. The proposed project will abandon and relocate portions of the existing storm drain system that runs through the 549 and 557 Highland private property into the public Right of Way on Highland, Cuesta and Felton, as well as slip line other portions. The new storm drain system will connect into an existing drainage channel near 492 Felton. A hydraulic analysis has been done to ensure that the channel on Felton has the capacity to accept the additional drainage. . The new storm drain system includes the installation of one catch basin and approximately 900 linear feet of 18 and 24-inch storm drain pipe. The rerouting will allow the removal of public drainage facilities from beneath private property. The existing easements are inadequate to get construction equipment into to do pipeline replacements, and should the drains fail completely, the property improvements could be impacted. Abandonment of the existing CMP will be done by plugging the ends and filling the pipe with slurry. This is a common technique used in the industry to abandon CMP and prevent any future settlements of the ground surface above the pipe. After construction is complete staff will pursue an agreement from each affected property owner to abandon the current drainage easements. C4-1 Highland Storm Drain Repair and Replacement Page 2 CONCURRENCES This project is exempt from environmental review and a Notice of Exemption has been filed through the Community Development Department. FISCAL IMPACT There is currently $300,828 in the Master CMP Replacement account to support this request for $438,750. Additional funding of$350,000 is proposed in the 2011-13 Financial Plan to continue CMP replacements. If approved, this additional funding will bring the total funding available to $650,828. The project will not be awarded until after the start of the new fiscal year, 2011-12. By the time bids are received, Council will have concluded the budget process. If Council has funded the 2011-13 Master CMP Replacements Capital Improvement Project at the time of contract award, a Budget Amendment Request will be generated to transfer funding from the Master CMP Replacement account to the Highland Storm Drain Replacement project's account for construction. If the Council has not funded at least $150,000 for CMP replacements in the 2011- 13 Financial Plan, staff will return to Council with an alternative funding recommendation for the amount needed to award, or recommend the rejection of all bids. This project will be 100% funded through Measure Y, the half-cent sales tax measure approved by the City's residents. STRII--ET & FLOOD CAPITAL }Master CMP Replacement (90742) e� Highland Storm Drain Repair and Replacement(91035): J Construction:j $355,000 Construction Contingencies:! $36,000 CM Servicesd $45,000 Material Testing:1 $2,000' P rinting:i $750, JTotal Cost of Project $438,750 .---- ---_---------. -..._-..__------------ Current Funds in CMP Master Account. 5300,828 Funds Anticipated after July 1, 2011: $650,8281 ATTACHMENT Vicinity Map C4-2 Highland Storm Drain Repair and Replacement Page 3 AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE Plans and Specifications i.4 .rR�r a .YY.�r yyl" fV':<•, ' \\chstore4\Team\Counci1 Agenda Reports\Public Works CAR\2011\CIP\91035 Highland Storm Drain Replacement\91035 CAR Advertise.doc C4-3 ATTACHMENT WEF�STMONT WESTMONT PROJECT MARL ENE LOCATION-oo DALY ooG w -o �iL �J'� NEW DRAINAGE 0 9 SYSTEM Li IGHLAND oz UTH EXISTING DRAINAGE. SYSTEM ARREN TOLOSA HIGHLA. r- DONNA Q FET N o SN D Q Tq RAIL Q 2 OMAULDO Q z " CERRO ROMAULDO z OHO Dy��2 `q O FOOTHILL FOOTHILL FOOTHILL RAMONA `� D Q ROUGEO DEL MAR Q Q w RAMONA MEINECKE a Q � TALINA LUNETA Q UNETA oz 0 0 0 o z Sm m MURRAY ERRANO CDcw = z WEST a o Q J c Q s o z Of a_ � MISSION r VENABI-E M HIGHLAND STORM DRAIN REPAIR AND REPLACEMENT SPECIFICATION NO. 91035