[0:00] the city of Chanhasson manages [0:02] approximately 119 miles of streets in [0:04] their upkeep We review and grade [0:06] sections every 3 years Based on funding [0:08] we prioritize what roads need work and [0:11] schedule construction and repairs This [0:14] is our pavement management [0:17] plan One technique the city uses to [0:19] rehabilitate our streets is a procedure [0:21] called mill and overlay Mill and overlay [0:23] is a road construction technique that [0:25] involves grinding off that top layer of [0:27] a road surface and installing a new top [0:29] layer of pavement This is a structural [0:31] improvement that extends a road's life [0:33] cycle We use this construction technique [0:36] when a road starts showing signs of [0:37] deterioration and scores somewhere [0:39] between the 60 to 80 range on the [0:41] overall condition index A 100point scale [0:43] we use to rate a road's health Although [0:45] we use the OCI to address road [0:47] rehabilitation keep in mind that other [0:49] engineering factors may play a role in [0:51] the selection process For more [0:53] information on the selection process [0:54] make sure to check out the first video [0:56] in our pavement management series Those [0:58] ranges indicate that the pavement is [0:59] starting to show signs of distress such [1:01] as cracking but the underlying aggregate [1:04] base and sub layer are still in good [1:06] condition The lower the score the deeper [1:08] we have to mill and the more that we [1:10] have to take off the top Regardless of [1:13] how much is mil just replacing that top [1:15] layer alone saves a ton of cash and [1:17] gives the road an approximate 15 to 20 [1:20] year boost in life expectancy That's [1:22] milling overlay a road construction [1:24] technique that replaces the top layer of [1:26] the road and extends its life cycle For [1:28] more information about why we choose [1:30] certain repair methods over others an [1:31] overview of the construction process and [1:33] more intensive construction techniques [1:35] make sure to check out the other videos [1:37] in our pavement management plan series [1:39] For more information about the projects [1:41] happening around Chanhassen make sure to [1:42] check out chanhassenm.gov/projects [1:46] [Music]