Tier 1 cookies are used for technical purposes to improve users' experience and to allow users to more easily navigate the website.
Urchin software collects aggregate statistics of website visitor characteristics, traffic, and activity. This information is used to assess what content is of most and least interest, determine technical design specifications, and identify system performance or problem areas. The software records a variety of data, including IP addresses (the locations of computers or networks on the Internet), unique visits, page views, hits, referring websites, and which hyperlinks have been clicked . Tier 2 cookies are used to distinguish between summary statistics for users who have been to the site before and those that are visiting the site the for the first time. USACE does not gather, request, record, require, collect or track any Internet users' PII through these processes.