11 - Laserfiche WebLink

BACKGROUND The Pleasanton Public Library building was constructed in 1988 with a concrete tile roofing system. After recent regular reports of water leaking into the building during rain events, Interactive Resources, Inc. (IR) was hired to complete an assessment of the building's waterproofing systems. The assessment determined the original underlayment of the tile roof was at the end of its useful life and noted water intrusion around the upper clerestory windows. The roof access was also limited, impacting the ability to maintain the roof properly. Additionally, the assessment noted damage to several building components around the windows resulting from the water intrusion. On December 15, 2021, Staff authorized a task authorization for $91 ,663 under an on- call agreement with Dahlin Group to provide design services to correct the issues identified by IR, which included interior lighting and study room improvements. After preliminary cost estimates were received, two separate projects were created, dividing the roofing and window work and the lighting work. On January 5, 2022, Staff authorized a task authorization for $91 ,185 under an on-call agreement with Dahlin Group to provide design services for the library's lighting and interior improvements. At that time, the Library Lighting Improvements Project, CIP No. 23493, was not established, and $30,754 out of the $91,185 was charged to CIP No. 14408 as part of interior improvements. On June 21, 2022, the City Council awarded the project to Argo Construction, Inc. for $2,249,020 and authorized Staff to approve and execute contract change order(s) for a not-to-exceed project contingency amount of $337,000 (approximately 15 percent), for unforeseen yet necessary related work. On December 6, 2022, the City Council appropriated an additional $190,000 to the Library Roof Replacement Project, CIP No. 14408 and authorized the remaining $85,000 from the unincumbered project balance, to fund various required change orders due to unforeseen conditions discovered during construction, including the replacement of six additional gable windows. The City Council authorized the City Manager or designee to negotiate final costs and execute change orders for up to a not-to-exceed amount of $612,000, an additional $275,000 from the prior authorized amount of $337,000. DISCUSSION The Library Roof Replacement Project included the removal and replacement of the entire 35,500 square feet of the tile roofing system; the removal and replacement of 2,800 square feet of single-ply membrane roofing material, which is used in the flat areas of the roof and not visible from the ground; and replacement of the clerestory and gable windows with a new window system and improved tinting for thermal efficiency. The project made several improvements to the access and maintenance of the roofing system. New gutters with gutter leaf protection were installed to reduce maintenance. Roof anchors for a fall-protection system and walkable tiles were installed to allow maintenance personnel to safely and easily access and service the roof and clean the upper clerestory and gable windows. Dropdown access ladders were installed inside the library for more accessible roof and HVAC equipment access. Page of