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Arden Hills, MN Pavement Condition Assessment and Analysis 4. IMS Quality Control (QC) —The IMS project manager then does a review of the data and works with the QC team lead to address any issues that may be identified. 5. IMS Quality Assurance (QA) — The IMS project QA Manager independently reviews the rated data and works with our Project Manager and QC team to correct any issues observed. 6. Client QA — The IMS Project Manager reviews the findings of the pavement condition data with City staff before beginning any analysis activities. IMS will present the pavement condition data in a Client Review Spreadsheet (CRS) along with maps illustrating pavement conditions for the client to independently review. Rutting and Roughness IMS' LCMS-2 systems detect rutting on asphalt roadways using laser measurements of transverse profiles that are collected continuously as the vans drive at normal traffic speed. With more than 4,000 measurement points collected per transverse profile and sub -millimeter vertical accuracy, the LCMS-2 can define transverse profiles with a high level of precision, accuracy, and repeatability. Once all the transverse profiles are collected for a 415000 roadway, IMS uses the Brazilian Method, which is an industry standard method, to determine the rut area and the deepest (or maximum) rut depth for the 414000 profiles. These values, as well as width of rut and color coding, can be seen in the LCMS-2 laser image to the right. Orange represents high severity rutting, 413000 while yellow represents moderate severity rutting. The severities are determined based on maximum rut depth thresholds that are specified in ASTM D6433. 41za0o Pavement roughness is evaluated by measuring the accumulated difference in the vertical displacement of a road surface, independent of chassis response, over a prescribed road length (longitudinal profile). This roughness is typically reported via the International Roughness Index (IRI). IRI data is calculated in real time from continuous longitudinal profile data collected by the LCMS-2's 3D profile 411000 410000 0 500 1000 1500 2000 2500 3000 3500 4000 Rut area and severity levels shown on the LCMS-2 composite image. device. To determine the road profile, data is simultaneously obtained from three devices: a pulse transducer -based distance -measuring instrument (DMI), high-speed 3D laser sensors operating at 112 MHz, and an accelerometer in compliance with ASTM E 950. The LCMS-2 unit conforms to a Class I profiling device, and it can also "pause" over non - valid roadway sections such as localized maintenance activities, railroad crossings, speed bumps, and brick inlays and not affect the IRI value. IMS Infrastructure Management Services, LP