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CASS COUNTY GOV 7012822226 05/10 '02 07:19 N0.676 04/11 <br /> <br />Proposed Scope of Services: Cass County <br /> <br />Braun Intertec proposes to provlde Cass County with the following: <br /> <br />Deflection testing with a Dynatest Model 8000E Falling Weight <br />Deflectometer (FWD) at fl~e rate of l 0 tests per mile (flexible <br />pavements) or 20 test per mile (ri~q.d pavements) on the roach select~ <br />by Cass County. The 20 tests for rigid pavements include 10 mid <br />panel tests and 10 mmsverse joint tests. Additional tests can be <br />requested. <br /> <br />For paved roach, the deflection data is analyzed to determine <br />reeonmaended spring axle load lift, ts or stiffness andjoinI analysis <br />(Option l), effective subgrade soil strength expressed tn CBR value or <br />modulus of subgrade reaction (Option 2% recommended overlay <br />thickness or improvement design thickness (Option 3% or detour route <br />evaluation (Option 4) in aconrdance w/th the Mn/DOT 1991 Detour <br />Management Study. <br /> <br />For aggregate surface roads, the deflection data is analyzed to <br />determine the effective subgrade soil strength(Option 2), Additional <br />analyses are available for each section tested to calculate the Effective <br />Structural Number (ESN) for the in-place materials and to recommend <br />overlay thickness (Option 3). <br /> <br />Pavement surface condition evaluation using a modified version of the <br />Corps of Engineers' PCI method is proposed for paved roadways. <br />Sampling will be at approximately 20%, which is S samples per mile, <br />end sample size will be 24 feet (or road width) by 200 feet. The PCI <br />data is analyzed to categorize pavement sections into general <br />main.tenanee categories (Option 5), Options are listed on the <br />following page. <br /> <br />5. Two copies of the report will be furnished to Cass County. The report <br /> will include: <br /> <br />· description of the work performed <br /> <br />· table summarizing information reported by the county <br /> <br />· tables summarizing results of the test/ag <br /> <br />· analysis and reeommendstions as requested by the eoonty <br /> <br />· aopies of the field data with analysis results <br /> <br /> profile plots of the analysis results. <br /> <br />Items to be provided by Cass County on the at~ached Data Analysis Form: <br /> <br /> 1. Sections to test including beginning ~d ending termini, and a map highliglatJng the <br /> sections. <br /> <br /> 2. Pavement structure (as built) and sub,fade soft ty~c, <br /> <br /> <br />