[0:00] chanhassen is home to approximately 119 [0:03] miles of city-owned streets these [0:05] streets serve as a major form of [0:07] transportation for our 26,000 residents [0:10] 500 businesses and hundreds of daily [0:16] visitors our roads see a lot throughout [0:18] the year and they especially take a [0:20] beating in the winter when plows are [0:21] scraping and salting them in order to [0:23] ensure that our roads are in good [0:25] working condition the city's engineering [0:27] department utilizes a pavement [0:28] management plan what goes into this plan [0:31] how do we decide what roads are repaired [0:34] and how do we decide what kind of work [0:35] each road needs to start the city is [0:38] broken up into three geographical areas [0:41] each area is field reviewed every 3 [0:43] years one of the reviewing techniques [0:45] our engineers use to evaluate road [0:47] conditions is the overall condition [0:48] index or OCI the OCI is a series of [0:51] ratings that help determine what sorts [0:53] of repairs each road needs like with [0:56] school grades or bowling the higher the [0:57] score the [0:59] better generally if your road scores 90 [1:02] or higher it's in excellent shape and [1:04] just needs some minor maintenance and [1:05] maybe some monitoring if your score is [1:07] between 80 to 90 your road's in really [1:09] good condition just might need some [1:11] minor maintenance like some cracks [1:13] sealed or maybe some potholes filled 70 [1:15] to 80 means we might use a Milland [1:17] overlay rehabilitation method and 60 to [1:20] 70 means we definitely will 50 to 60 is [1:23] a decision between mill and overlay and [1:25] a full depth reclamation 40 to 50 is a [1:28] definite full depth reclamation and [1:30] anything 40 or lower is a full [1:32] reconstruction now although this is how [1:34] we use the rating system generally to [1:36] address road rehabilitation there are [1:38] other engineering factors that may play [1:40] a role in the selection process so what [1:42] does this all mean well a basic [1:45] maintenance technique is seal coating or [1:47] chip sealing this involves applying a [1:49] thin layer of oil and rock to the road [1:51] surface to prevent moisture penetration [1:53] and UV damage and extend the lifespan of [1:56] the road by approximately 7 years mill [1:58] and overlay takes us a little bit deeper [2:01] this involves removing or milling the [2:03] top layer of existing asphalt and [2:05] replacing or overlaying it with new [2:08] asphalt this process restores the [2:11] surface improves the ride quality and [2:13] extends the road's life by approximately [2:15] 15 years [2:17] full depth reclamation or FDR involves [2:20] pulverizing the existing asphalt as well [2:23] as some of the gravel layer beneath it [2:25] that debris is then recycled and [2:27] compacted to create a new durable base [2:30] for the road lace some new asphalt and [2:32] pow a new road this recycling technique [2:36…