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OBOLTON & MENK Real People. Real Solutions. August 1, 2024 David Swearingen, PE Public Works Director/City Engineer City of Arden Hills 1245 W Highway 96 Arden Hills, MN 55112 Attachment A RE: Engineering for 2024 PMP Street & Utility Improvements Project Amendment 2 - Additional Construction Services Dear David: Ph: (952) 890-0509 Fax: (952) 890-8065 Bolton-Menk.com Through the construction phase for the City of Arden Hills' 2024 PMP Street & Utility Improvements Project, there have been a number of unanticipated site conditions and delays which have led to additional consulting fees being accrued. Below is a list of the items that required additional construction services, including topographic survey, staking, construction administration, and construction observation: The beginning of construction required a higher level of effort to complete construction observations on subsurface utility installations. As such, we were trending over budget half way through the project. Therefore, we reached out to city staff in mid -June to let you know of our concerns and ask how to proceed with our services moving forward. Being that the majority of the remaining work was street/surface work, we agreed to lower our average weekly construction observation hours moving forward as much of this work could be inspected after the fact, if necessary. Identifying this early allowed us time to make a change and keep the project engineering fees on budget (and actually allow for additional weeks of construction services under the original budget). It was determined in the field that the park improvements completed last fall did not align with the proposed street improvements, and particularly the parallel parking bumpout area, on Royal Lane. The designs matched up horizontally but did not align vertically due to the improvements being completed after topographic survey was completed in the area for the project design. As a result, we had to complete additional topographic survey of the area including the new park improvements, re -design the parallel parking bumpout area/curb and gutter/pavement crown transition, and re -stake the improvements to make them constructable. It was determined in the field that the subbase materials on Royal Hills Drive were too soft to complete grading work and support the identified street rehabilitation method. This resulted in additional construction administration time to investigate the issue, identify possible solutions, and coordinate a change order to properly address the issue. In the end, an innovative cement stabilization method was successfully implemented and will serve as an example that could potentially be utilized elsewhere in the city in the future. • The construction schedule is taking the contractor longer than anticipated due to significant rain delays causing additional construction work earlier in the season and due to other unanticipated H:\ARDH\0T1130168\0_2024 PMP Street & Utility Improvements\A_Project Management\Z_Contracts\Amendments\Amendment 2.2\130168_2024 PMP Street & Utility Improvements Amendment 2_20240801.docx Bolton & Menk is an equal 0000rtunity emolover.