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Stantec Consulting Services Inc. <br />733 Marquette Avenue, Suite 1000 <br />MinneapolisMN 55402-2314 <br />May 22, 2025 <br />Athanasia Lewis <br />Interim City Administrator <br />City of Centerville <br />1880 Main Street <br />Centerville, MN 55038 <br />Dear Ms. Lewis, <br />Reference:Brian Drive, Culvert Bridge 02J04 Analysis <br />We have completed an analysis of the potential options that the City may consider forCulvert Bridge 02J04, <br />carrying Brian Drive over Clearwater Creek, which is currently load posted and limiting access for <br />emergency vehicles. <br />1 Existing Conditions/Load Rating <br />The load rating previously performed by LHB, an engineering consultant,in 2022 resulted in the structure <br />being load posted. Stantec has conducted an independent load rating analysis to confirm these results. The <br />culvert was load rated using MnDOTÓs LRFR of In-Service Metal Pipe Structures Calculator spreadsheet <br />and was rated using the culvert geometry, material properties, and cover provided by the previous load <br />rating completed by LHB in 2022. For the analysis, theculvert is assumed to have a 9Ó-9Ñ x 6Ó-7Ñopening <br />with 3Ñx1Ñx12 gauge corrugationsand1Ó-9Ñ of cover, including 6Ñ of bituminous pavement. This information <br />was not independently verified, and we have assumed it to be correct for this independent load rating.A <br />survey of the roadway and culverts would provide a more accurate analysis.The most recently available <br />inspection report from 2024notes that theNBI Condition Rating for the culvert is a 5 with distortion, joint <br />separation, and small areas of section loss. The condition factor used to calculate the capacity of the culvert <br />was reduced accordingly. <br />2Culvert Analysis <br />Our review of the most recent load ratingconfirms that the culvert should remain load posted with the <br />current 1Ó-9" of assumed coverabove the culvert. We have analyzed four (4)potential options that could <br />increase the load rating and allow the bridge posting to be removed. <br />Two of the options are to increase the depth of cover over the existing culvert. At shallow covers, the load <br />rating is highly sensitive to increases in fill and pavement type.We assessed the current condition and <br />64 <br /> <br />