The only thing Chico looks at is whether you completed the a-g matrix and your Eligibility Index. With a 3740, you should have no problem getting in there.
UCSC is a more nuanced puzzle. You GPA is a little low but, your test scores are well above average. Assuming a competent essay and typical ECs, you are a pretty solid candidate. A GPA closer to their avg of 3.88 would make you a virtual lock (though for UCs, there is no such thing)
From their web site here is what they consider - in rank order.
1 Grade-point average (GPA)
2 Test scores
3 Courses completed/planned (a-g only)
4 Honors courses taken and performance
5 Eligibility in the Local Context (ELC)
6 Quality of senior-year program of study
7 Quality of your senior-year program as measured by the type and number of academic courses in progress or planned.
8 Educational opportunities in high schools
9 Quality of your academic performance relative to the educational opportunities available in your high school.
10 Performance in academic subject areas
11 Outstanding performance in one or more academic subject areas.
12 Achievements in special projects
13 Outstanding work in one or more special projects in any academic field of study.
14 Improvement in academic performance
15 Special talents, achievements, and awards
16 Participation in educational preparation programs
17 Academic accomplishment within life experiences
18 Geographic location
All that gets stirred in and compared with other applicants. The items with the most impact on your admission are closer to the top of the list.
How much of a GPA or ACT deficit will an Olympic medal offset is hard to say.