With an acceptance rate of 31%, I’d say URichmond fits into the Tier 1.
COA is a very self-selecting school (only major available is Human Ecologyhttp://talk.collegeconfidential.com/college-search-selection/572715-barrons-most-competitive-schools.html, fewer than 500 students) and subsequently has very weird admissions statistics. Their class rank and GPA are all over the place, their mid range ACT is 28-32 (same as, for example, Colgate), but their SAT scores are significantly lower. Princeton review gives them a selectivity rating of 91.
http://www.princetonreview.com/schools/1024147/college/college-atlantic
This thread a few years ago attempted to explain some of the weirdness.