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HomeMy WebLinkAboutItem 2e: Accept Work by JRN for Wildnerness Park Slope Stablization as CompleteDATE: March 2, 2010 TO: Mayor and City Council SUMMARY BACKGROUND STAFF REPORT Public Works Services Department FROM: Jason Kruckeberg, Assistant City Manager /Development Services Director Philip A. Wray, Deputy Director of Development Services /City Engineer Prepared by: Kevin Merrill, Senior Engineering Assistant SUBJECT: ACCEPT ALL WORK PERFORMED BY JRN INC. FOR WILDERNESS PARK SLOPE STABILIZATION AS COMPLETE AND AUTHORIZE THE FINAL PAYMENT TO BE MADE IN ACCORDANCE WITH THE CONTRACT DOCUMENTS Recommendation: Accept On June 16, 2009, the City Council awarded a contract to JRN, Inc. in the amount of $368,590 plus a 10% contingency for the construction of the Wilderness Park Slope Stabilization Project. The terms and conditions of this project have been complied with and the work has been performed to staff's satisfaction for a total project cost of $402,458.49. This amount reflects the original contract amount of $368,590 plus changes totaling $33,868.49 or 9.2% above the original contract amount. Staff recommends that the City Council accept all work performed by JRN, Inc. as complete and authorize the final payment to be made in accordance with the contract documents. During heavy rainfall in January 2005, a portion of the backyard slope at 2248 Highland Oaks Drive slid down onto the adjacent Wilderness Park Access Road. As a result of the slide, the property owner filed a lawsuit for damages caused by the slide. Subsequently, the City and the property owner entered into a settlement agreement whereby the City agreed to construct a retaining wall and rebuild a more stable slope to protect from further erosion. The project was included in the City's fiscal year 2008/09 Capital Improvement Program with a budget of $450,000. Plans and specifications were prepared in early 2009 and Staff Report March 2, 2010 Page 2 the project was bid in May. Bids were opened on May 26, 2009 with the lowest bid of $368,590 submitted by JRN Inc. On June 16, 2009, the City Council awarded a contract for the Wilderness Park Slope Stabilization to JRN Inc., in the amount of $368,590, and approved an additional appropriation of $50,000 from the Capital Outlay Fund. DISCUSSION Work began on September 8, 2009 and was completed by January 15, 2010. The project included construction of a retaining wall that consists of drilled concrete piles embedded with steel columns and wood lagging installed between the steel columns to a maximum height of 23 feet. In addition the slope was restored from behind the new wall to the existing rear yard and patio of 2248 Highland Oaks Drive. The sloped area above the retaining wall includes a perimeter chain link fence and concrete drainage ditches that connect to a new catch basin and subsurface storm drain system. The subsurface drain pipe collects runoff from the backyard drainage system of 2248 Highland Oaks Drive as well as the slope drainage ditches and outlets the flow onto the access road below. Overall, staff was very pleased with the contractor's performance relative to delivery and quality of work. There was one change order in the amount of $33,868.49, which increased the contract amount to $402,458.49. During construction, adverse slope conditions became apparent that were previously unforeseen. The design team determined that the wall alignment should be modified to better protect the eroded slope and to provide a better transition from manufactured to natural slopes. The original design was for the retaining wall to be located at the edge of the park access roadway with the very north and south ends turned inward and tapering up the slope to act as wing walls to hold the new fill material behind the wall. The modification was to the north and south ends to eliminate the inward segments and to continue the wall along the roadway edge. Although the change did not impact the cost of the wall, additional costs were required for fill material, special slope treatment, storm drain pipe and welded angle iron to retain the wood lagging. The one change order of $33,868.49 reflects an increase of 9.2% over the contract amount. FISCAL IMPACT This project was included in fiscal year 2008/09 Capital Improvement Program with a budget of $450,000. The City Council approved an additional appropriation of $50,000 from the Capital Outlay Fund on June 16, 2009 for a total budget of $500,000. The total construction cost was $402,458.49 and the total project cost including construction, design, inspection, survey, and construction administration is within the total budget. Staff Report March 2, 2010 Page 3 RECOMMENDATION That the City Council accept all work performed by JRN Inc. for the Wilderness Park Slope Stabilization Project as complete and authorize the final payment to be made in accordance with the contract documents. Approved by: P� JK:PAW:KM:pa Donald Penman, City Manager