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City of Arden Hills 2028 Pavement Management Project Proposal QTB221496 September 4, 2025 that the City permit will not include a work hour restriction for this work (i.e., an 8:00 AM to 4:00 PM normal work hour will apply). Traffic Control Based on aerial images from Google Earth we anticipate performing the borings and pavement cores mainly in low volume residential roads in existing drive lanes. We are including fees for warning signs to alert motorists to our work within the roadway. For Stowe Avenue and Pine Tree Drive/Harriet Avenue, we are including fees for our subcontractor, Safety Signs of MN, LLC, to perform traffic control (flagging) for the pavement cores in these locations. We are including fees for up to 2 days of flagging in our scope of services. Ground Penetrating Radar We understand that the streets are proposed to be rehabilitated via a mill and overlay or full -depth reclamation (FDR). To help with filling in pavement section thicknesses between the proposed boring/pavement core locations, we propose to perform ground penetrating radar (GPR) prior to performing our borings and pavement cores. The GPR testing would be proposed in both travel directions along the planned roadways. The GPR data will provide a continuous estimate of pavement layer thicknesses along the roadways that is correlated to the thickness of the physical pavement core samples to provide a more complete estimate of the overall in -place. The GPR measurements obtained will be tied to GPS coordinates for mapping and reference purposes. An air -coupled GPR unit can be expected to penetrate approximately 2 feet under ideal conditions and is capable of detecting differentiation between bituminous pavement layers and underlying aggregate base layers if present. The GPR can take 4 to 5 measurements per linear foot, so for a 1-mile-long alignment it can produce 20,000 to 25,000 thickness measurements for each direction of travel with the GPR. The GPR is a very efficient way of collecting additional pavement thicknesses measurements for estimating purposes. Figure 2 in our soil borings section shows the proposed GPR locations. Pavement Coring We propose to perform 40 pavement cores for the project, 4 of those locations will be at soil boring locations. The coring will be performed with a 4-inch diamond -toothed core barrel fitted on a mechanically operated rotary drill. The coring will extend down through the existing bituminous section. Upon completion of each core, we will extend a manually operated hand auger through the aggregate base section to a depth of 2 to 4 feet into the underlying subgrade. The thickness of the cores will be measured to the nearest 1/4-inch, and the aggregate base will be measured to the nearest 1-inch (depending on the underlying soil type and past mixing of the aggregate layer). If groundwater/frost is encountered, we will note their presence on the boring logs. We will photograph the pavement cores and attach in a core photo log. The pavement cores will be retained for up to 60 days, unless otherwise noted. Braun Intertec Page 3