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City of Arden Hills <br /> Project BL-12-05201 <br /> September 28, 2012 <br /> Page 2 <br /> Table 1—Summary of Borings <br /> Reported Reported Reported <br /> Boring Bituminous Aggregate Base Subgrade(<5 ft) <br /> Number Street/Location Thickness(in) Thickness(in) Material(s) <br /> F A3 Asbury Avenue,south of 3.5 — Silty Sand over Sand with Silt <br /> Glenhill Road <br /> Ridgewood Road,south of Silty Sand over Sandy Lean <br /> A4 Glenhill Road 3'0 Clay over Silty Sand <br /> Asbury Avenue,south of Clayey Sand over Sandy Lean <br /> B13 Edgewater Avenue 4.0 Clay <br /> Edgewater Avenue, <br /> B14 between Asbury Avenue 6.0 0 Clayey Sand over Sandy Lean <br /> and Ridgewood Road Clay <br /> Glenhill Road, between Silty Sand over Sand with Silt <br /> B15 Asbury Avenue and 5.25 — <br /> over Silty Sand <br /> Ridgewood Road <br /> B16 Ridgewood Road,north of 3.75 19.25 Silty Sand over Organic Clay <br /> Glenhill Road over Sandy Lean Clay <br /> Average 4.25 <br /> The geologic materials encountered were classified by Element Materials Technology and were not <br /> reviewed by Braun Intertec. According to the logs,groundwater was not reported in any of the borings. <br /> No laboratory testing was included on the logs or in the subsurface exploration information provided to <br /> US. <br /> Aggregate base was noted in only two of the borings; B14 on Edgewater Avenue noted 7 inches of <br /> aggregate base and B16 on Ridgewood Road noted 19 1/4 inches of aggregate base. <br /> Pavement Condition and Proposed Maintenance <br /> In providing our geotechnical opinion for the proposed maintenance options,we reviewed historical <br /> data from the City's ICON pavement management system. This included a review of past pavement <br /> condition surveys,as well as historical project information. Results from the pavement condition <br /> surveys included observation of various distresses, such as raveling, longitudinal and transverse <br /> cracking, patching and alligator cracking. <br /> Typical bituminous pavements last 20 to 25 years,depending on various factors such as thickness <br /> design,environmental conditions,traffic loading, and drainage conditions. Pavement life is also <br /> dependant on maintenance treatments applied throughout the life of the pavement. <br /> BRAUN <br /> I NT TC <br />