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Feasibility Report TKDA Project No. 18196.000 City of Arden Hills Page 8 The cul-de-sac east of Snelling Avenue appears to have consistent ground water along the south curb line. Upon the field inspection, several drain tile and sump pump discharges were noted in the cul-de-sac area extending down the street towards Snelling Avenue. Several residents explained the drainage issues they had in this area as well. It was noted that water comes from the back yards in between the houses to the street on the south side of Arden Oaks Drive. Arden Oaks Neighborhood Proposed Improvements: Streets: Considering the existing condition, deterioration factors, and geotechnical investigation, a full depth pavement reclamation is proposed for the streets within the project area. Other improvement options were investigated, but with pavement ratings below 45 out of 100, a mill and overlay only provides limited benefit. Seeing that the underlying base and pavement materials have deteriorated, cracking would reflect to the new bituminous overlay almost immediately. Full reconstruction was also evaluated, but because the majority of utilities and concrete curb is in fair condition this option is not economically feasible. A full depth reclamation emerged as the recommended street improvement to provide the neighborhood with a uniform street section and longer lasting results than superficial improvements with a lower cost than full reconstruction. Full depth reclamation will provide a new structural aggregate base and disrupt the existing frost heaving that has breached the existing aggregate base and bituminous surface. This improvement will provide a new paving surface that should last 30 to 40 years (with future maintenance and mill and overlay improvements). Table 1 provides the coring information gathered from the geotechnical report coring log (Exhibit 7) and forensic pavement report (Exhibit 1). Table 1: Coring Logs Core Bituminous (in) Aggregate Base (in) Total (in) Subgrade Soil Type Mill & Overlay Depth (in) Reclaim Depth (in) A 5 12 17 Sandy lean clay *NR 12 B 5.5 8 13.5 Sandy lean clay *NR 12 C 6 6 12 Sandy lean clay 2 12 D 5 8 13 Fill: Sandy lean clay 2** 12 E 6 5 11 Sandy lean clay 2 12 F 6.5 7 13.5 Sandy lean clay 2 12 G 5.5 5 10.5 Fill: Sandy lean clay 2 12 H 6 13 19 Fill: Sandy lean clay 2 12 *NR – Not recommended by report ** Potential area subject to raveling after milling To make room for the new bituminous section, the reclaimed material will be graded and compacted to a depth of 5” below finish grade after reclamation and excess material removed. A leveling layer of 1” of class 5 will be added under a 4” bituminous pavement section placed over the new roadway base in two lifts across the width to provide a smooth new surface. A proposed typical section for Arden Oaks Drive and Arden Oaks Court is shown in Exhibit 3. Figure 5. Ground Water from May 2019 Arden Oaks Drive Figure 6. 2020 Street Reclamation Project from White Bear Township Street Project