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City of Santa Ana Pavement Management Program Update RFP No. 19-070 August 6, 2019 Prior to the kick-off meeting, NCE will prepare a detailed agenda, which will be sent to City staff for review. In addition, NCE will schedule additional meetings with City staff at appropriate milestones to review the work performed, survey progress, and to address any questions or issues that arise. NCE is also available upon request of the City's staff to assist with preparing materials and presentations for City Council meetings or any public meetings. 2.2 — Pavement Condition S NCE will perform walking pavement condition surveys on the City's MPAH pavement network, approximately 105 sections centerline miles. In addition, NCE will perform walking surveys for complete Local network will be performed on 317 centerline miles (approximately 3,992 segments) of streets Like many Southern California communities, the distresses present are reflective of the traffic levels, as well as the local environment and climate. Common distresses include alligator cracking, rutting, distortions, patches and utility cuts, as well as weathering and raveling (examples shown left). There are three types of distress surveys that agencies and consultants have performed for pavement management programs, and each has its advantages and disadvantages. Briefly, these are: Walking Surveys — These are performed with one -person crews (for high volume streets like expressways or major arterials, two -person crews may be needed for safety). The major advantage of this survey method is that it is highly accurate, since cracks and all other pavement distresses are measured and recorded. However, walking surveys are more labor-intensive and are thus more expensive than windshield surveys. OCTA recommends this method for the MPAH. Windshield Surveys — These are performed with two -person crews in a vehicle traveling at low speeds (under 15 mph). The major advantage is that 100% of the roadway is surveyed, and it can be accomplished very quickly, safely and inexpensively. However, the disadvantage is that the data collected tends to be of variable quality. In particular, low -severity distresses are typically not visible from a moving vehicle. This results in a higher than expected condition rating of the streets, and consequently, a lower estimate of the backlog and pavement M&R needs. OCTA accepts windshield surveys for local roads. Automated Surveys — These are typically performed with a customized vehicle that is equipped with a video or digital camera and/or laser bars. The major advantage is thatthey are equipped to perform surveys very quickly and safely. However, post -processing time can offset cost -savings in the field, and the quality of the data can be variable depending on light conditions (e.g., tree -lined streets with contrasts in light and dark) because shadows can mask some distresses. Typically, only the outer travel lanes are surveyed, and for most residential streets, only one lane is surveyed. No parking lanes are included, which eliminates Page 118 25D-31