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City of Arden Hills Proposal QTB210666 February 21, 2025 Page 7 ▪ Sediment subcontract laboratory testing – typically within 2 weeks after field sampling. ▪ Preliminary results – within 2 weeks after completion of pavement coring and soil boring field exploration; within 2 to 3 weeks after collection of sediment samples. ▪ Draft report submittal – within 3 weeks of after completion of field exploration. ▪ Final report submittal – within 5 days of receiving comments on the draft report and depending on the complexity of the comments. If we cannot complete our proposed scope of services according to this schedule due to circumstances beyond our control, we may need to revise this proposal prior to completing the remaining tasks. OPTIONAL – 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 as an optional item, 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. Fees We will furnish the services described in this proposal for a lump sum fee of $34,725. Table 2 provides a breakdown of the proposed fees. If the optional ground penetrating radar scope of service is wanted, please elect the optional scope by checking (electing) the box by the signature line.