Item 19 - Agreement for Pavement Managment Program Update

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o' CTA &GO Countywide Pavement Management Plan Guidelines Local Tax Dollars at Work OCTA allows windshield, walking, and calibrated automated surveys. It is recommended that windshield surveys be supplemented with walking surveys. In a windshield survey, the inspector travels in a vehicle at slow speeds (5 to 10 mph) and observes the pavement condition from within the vehicle. The entire length of the pavement section is driven and observed. A driver is required for safety reasons, with the inspector/recorder in the passenger side of the vehicle. The inspector should have a list of street sections to be surveyed and a planned route. The entire pavement section is surveyed, and the distress data are estimated and recorded. In situations where the distresses need closer examination, or where there are difficulties in observation, the inspector should stop the vehicle and walk the pavement section to verify the distresses observed from the vehicle. All field data collection procedures should conform to the local agency's safety practices and should be included in the QA/QC Plan (see Appendix A). When walking surveys are used, the following procedure should be followed: 1. Each pavement section must be inspected using sample units. Individual sample units should be representative of the pavement section conditions and may be marked or identified to allow easy location for quality control purposes. Paint marks along the edge or sketches with locations connected to physical pavement features are acceptable. The figure below illustrates the definition of a pavement section and a representative sample unit. Pavement section Representative sample unit Zft 1000 ft 2. The area of AC sample units should be 2500±1500 square feet, and for PCC sample units, this should be 20±8 slabs. The total inspected area or slabs for a pavement section must be at least 10% of the total pavement section area or slabs. This is an exception to the procedure described in ASTM D6433. For example, a pavement section 950 feet long and 32 feet wide must have at least one sample unit (typically 100 feet long x 32 feet wide = 3200 sf). Longer sections will require multiple sample units. 3. Additional sample units are to be inspected only when non -representative distresses are observed. Typically, these will be distresses that are localized in nature and not representative of the entire pavement section e.g. high severity alligator cracking found near bus pads, rutting in intersections, distresses due to landscape watering/ponding etc. Effective March 2024 2-3