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The City of Arden Hills is seeking professional engineering and construction
<br />services to assist with the 2024 PMP Street and Utility Improvements
<br />project. We have reviewed in detail the full request for proposals (RFP),
<br />proposed project improvements maps, storm sewer field inspection notes,
<br />and the Pavement Evaluation Report. Additionally, we have conducted
<br />our own field site visit to better understand the project area and identify
<br />potential unique project considerations.
<br />We understand the project area includes Keithson Drive from Highway 96
<br />W to the south 800 feet, Royal Hills Drive from Snelling Avenue N to Arden
<br />View Drive, Arden Vista Court, McClung Drive, Colleen Avenue, Colleen
<br />Circle, Briarknoll Circle, Briarknoll Drive, Norma Avenue from Dawn Circle to
<br />Colleen Avenue, James Avenue, and Royal Lane. The major project elements
<br />are anticipated to include roadway improvements, select storm structure
<br />reconstructions, select watermain upgrades, and pond dredging. The project
<br />area does not include any parallel sidewalks or trails; it is assumed that no
<br />ADA improvements/design will be necessary.
<br />The 2024 PMP Street and Utility Improvements project is identified within
<br />the City of Arden Hill's current Capital Improvement Plan for construction
<br />in 2024. The project area is generally bounded by Snelling Avenue N to the
<br />west, Hamline Avenue to the east, County Road 96 W to the north, and Floral
<br />Drive to the south. The project area contains rolling topography and has
<br />a high point near County Road 96 W and Hamline Avenue which generally
<br />slopes downhill to the southwest. The project area is primarily residential,
<br />made up from 10 developments identified in the RFP as having been
<br />completed between 1976 and 1986. During development, the public utilities
<br />were constructed with polyvinyl chloride (PVC) sanitary sewer, ductile iron
<br />pipe (DIP) watermain, and included stormwater management ponds.
<br />The city has indicated that staff have all record drawings available for
<br />the project area, with the exception of the stormwater ponds. Since the
<br />infrastructure's initial construction, city pavement management records
<br />indicate the most recent structural pavement improvement projects include
<br />• Keithson Drive —1994 Reconstruction
<br />• Royal Hills Drive, Arden Vista Court, McClung Drive, Colleen
<br />Avenue, Colleen Circle, Norma Avenue, and James Avenue —1997
<br />Reconstruction
<br />• Briarknoll Circle, Briarknoll Drive, and Royal Lane — 2007
<br />Reconstruction
<br />The current pavement condition index (PCI) ratings for the proposed project
<br />streets range from 20 to 45 which indicates the pavement is beyond its life
<br />cycle and in need of rehabilitation. The City of Arden Hills enlisted Braun
<br />Intertec to complete a Pavement Evaluation Report on the residential
<br />project streets in June of 2022. The report made recommendations for the
<br />rehabilitation method of each street.
<br />The first rehabilitation method recommended is a mill and overlay which was
<br />identified for Arden Vista Court, McClung Drive, Colleen Circle, Briarknoll
<br />Circle, Briarknoll Drive, Royal Lane, and James Avenue. Braun recommended
<br />milling the existing pavement to a minimum depth of 2 inches and repaving
<br />with new bituminous pavement (SPWEA230B).
<br />The second rehabilitation method recommended is a pavement reclamation
<br />which was identified for Keithson Drive, Royal Hills Drive, Norma Avenue,
<br />and Colleen Avenue. Braun recommended performing a 9-inch full -depth
<br />reclamation (FOR) without any pre -milling of the pavement. The excess
<br />reclaim material is then stockpiled, redistributed, or hauled offsite as
<br />necessary to construct the new pavement sections to the proper grade
<br />(typically about 4 inches of depth would be removed). After the roadway
<br />section is cut to grade, the top of the reclaim material would be evaluated
<br />to determine if additional subgrade improvements are necessary. The
<br />reclaim material would then be scarified, moisture conditioned, and surface
<br />compacted to at least 100 percent of standard Proctor density and a test
<br />roll would be performed to identify any non -conforming areas that need to
<br />be addressed. Braun recommended verifying at least 5 inches of reclaim
<br />material remains as aggregate base and repaving 4 inches of bituminous
<br />pavement (SPWEA230B) in two lifts.
<br />After Braun's report was completed, the city conducted additional reviews
<br />of the subsurface utilities and concluded that the watermain on James
<br />Avenue requires replacement to upgrade approximately 650 feet from 6-inch
<br />to 8-inch diameter. This will include the replacement of all water services
<br />to the ROW. Due to this additional excavation work, James Avenue will
<br />not be conducive to the mill and overlay rehabilitation method previously
<br />identified, and will instead require a reconstruction of the roadway after the
<br />watermain work is completed. It is likely that storm sewer replacements
<br />may be necessary to accommodate the watermain replacement work. This
<br />reconstruction area would be constructed to the city's standard residential
<br />pavement section. Additional soil borings will be conducted on James
<br />Avenue to verify the proposed pavement section is suitable.
<br />A parking area to accommodate approximately five parking stalls will
<br />be added at Floral Park along the east side of Royal Lane (north of the
<br />basketball court and west of the tennis court). It is assumed that 90 degree
<br />pull -in parking stalls will be added in this space and will be designed to
<br />drain back to a valley gutter along the existing curb line to manage drainage.
<br />Sanitary sewer improvements will be limited to the replacement of castings
<br />and rings on sanitary structures and repairs to select residential sewer
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