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• In response to the question seven, we have not determined the ages for all <br />occurrences of this type of stripping. We have however, noted that the stripping <br />occurs in certain areas, where presumably the pavement is of approximately <br />same age and sealing is also conducted at the same time (sealing is performed <br />on an area basis). We seal streets on an 8-year cycle, and do not perform "early <br />sealing" on new pavement after 2-3 years as some cities do. This program was <br />initiated in the early 80s. We have started to examine the practice of early <br />sealing, and would like to determine whether this would be more effective for our <br />City. <br />• We think this is occurring in pavements put down in the early 1990's where they <br />first started to use RAP in the mix. <br />• Just a quick glance revealed two areas with most noticeable stripping were built <br />around 1994- 1999 and mostly likely had two seal coat applications to date. Also <br />these are areas of clay soils. <br />• Most problems appear where there are just thin overlays. <br />• One of the segments is approximately 15 years and the problem is pretty much <br />continuous for the 10 mile segment. The problem is occurring in the center of <br />lane and appears as a stripping problem created in the original mix placement. <br />Possibly a segregation problem created by the paver during placement. <br />A-9 <br />