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Feasibility Report TKDA Project No. 18196.000 City of Arden Hills Page 6 Arden Oaks Existing Conditions: Streets Conditions: The majority of properties located within the Arden Oaks residential neighborhood were platted in the mid to late 1980s. According to the City’s CIP and city records, the last major maintenance task was a mill and overlay in 1996. Since then it appears the street section has been treated with chip seals, crack seals, hot patching, and partial overlays several times in the years since. The most recent maintenance appears to be a street overlay in select areas coating the outside edges of the roadway with a 1” to 1.5” lift of bituminous. According to the CIP, the Arden Oaks neighborhood is scheduled for major maintenance in 2022. Many factors have accounted for roadway deterioration including the following: x Time and weather (freeze/thaw cycle) x Underlying soil conditions x Traffic volumes x Roadway pavement section x Heavy vehicle loading x Surface and subsurface water drainage The City completes pavement ratings for local streets and has noted the ratings for the streets in this neighborhood were in the low 30s out of a 100-scale rating. During the field inspection of the neighborhood, many roadway deficiencies were noted including large frost cracks (through both curb and street sections), fatigue cracks, pot holes, and minor drainage issues. The rideability is also very poor. It was also noted many defects have been patched or filled recently. Additionally, it has been observed seasonal ground water is discharged from sump pumps or is seeping from the ground behind the curb. Although the geotechnical report did not explicitly note high ground water in the area, there are signs of it from field observations. The geotechnical report completed by WSB found that the pavement section in the Arden Oaks neighborhood ranged from 5 to 6-1/2 inches in depth. Additionally, suitable aggregate base material was found over the entire area of the Arden Oaks neighborhood ranging in depth from 5 to 13 inches. Underlain soils were typically sandy lean clay with gravel. The geotechnical report is located in the appendix in Exhibit 7; additionally the typical cross sections for the Arden Oaks neighborhood can be found under Exhibit 3. Figure 1. Recent Bituminous Overlay on Arden Oaks Drive Figure 2. Bituminous Patching, May 2019 Arden Oaks Drive