CCP 01-23-2006 - Laserfiche WebLink

Home Browse Search

. . . URS MEMORANDUM Thresher Square 700 Third Street South Minneapolis, MN 55415 Phone: (612) 370-0700 Fax: (612) 370-13783 To: Michelle Wolfe/Arden Hills Kristine Giga/ Arden Hills Tom Moore/Arden Hills Frank Ticknor/URS File: 37951 005 Copy: From: Greg Brown, PE Date: January 17, 2006 Subject: PClIPMP Discussion Items Iutroduction The following is a discussion of the technical calculation of PC I values for street pavements, how those values are used in prioritizing street rehabilitation and the proposed Pavement Management Program for 2006-2016. A, Pavement Condition Index (PCI) Discussion Pavement Condition Indexes are calculated by computer program algorithm which uses input from visual field inspection performed by trained technical staff. The program catalogues input from the field which essentially includes three basic elements. Surface Distress type, Severity levels of each given distress and frequency of the distresses observed on the pavement. Surface distresses include Alligator Cracking, Block Cracking, Corrugation, Depressions, Edge Cracking, Bumps and Sags, Flushing, Patches, Transverse and Longitudinal Cracking, Polished Aggregate, Rutting, Shoving, Raveling, Potholes, Swelling/Frost Heave. I will bring an inspectors field manual to the meeting to help illustrate the distress types and severities. Attached to this memo is a typical data sheet used to collect information to be input into the program. We have also attached a spreadsheet summarizing the City street PCI's collected in 1999,2002 and 2005 as well as proposed and recent work completed. The computer program generates a PCI value for a given street segment between 0 and 100. PCl's between 80-100 reflect pavements in very good to excellent condition and no rehabilitation other than sealcoating on a regular basis is recommended. PCl's between 56-80 indicate pavements in good to very good condition. This is the critical zone for consideration of rehabilitation by overlay prior to falling in the next zone. PCI's between 0-55 indicate pavements in poor to failing condition. B, Rehabilitation ApproachIPrioritization for Arden Hills The prioritization of proposed pavement improvements throughout the City of Arden Hills is based upon the following general considerations: PCl values for neighborhood streets (1999, 2002 and 2005 ratings) Prioritization given to overlay candidate vs. reconstruction candidate streets Available State Aid and City funding Condition/effectiveness of existing surface drainage system (or lack thereof) Condition of underground water and sanitary sewer utilities, need for dig-up repairs