You're lucky! When I got laid off last spring I found out that in CO if you take ANY job you lose all your benefits. I found out about the layoffs about 5 months in advance and thought about picking up a second job...cashier at the grocery store, etc, to stockpile some savings and was warned not to do that. If I had, even though I was being laid off by the job that was paying the bills and had insurance, CO wouldn't have approved me for unemployment!!!
This statement is not completely true. It may have depended on the circumstances. I work for unemployment in Colorado. If you get laid off from a job than you are eligible to collect unemployment as long as the company you were working for paid unemployment taxes. I am assuming that you would have continued working for the company you were going to be laid off from and then found a 2nd part-time job. If that was the case, then you should have still been able to collect unemployment.
In Colorado you can earn up to 25% of your Weekly Benefit Amount without being penalized. Anything that you make over that 25% is then deducted dollar for dollar from your weekly pay. For example, if your weekly benefit amount is $400, you can make $100 a week at a part-time job and still collect the full $400 from unemployment. If you make $105 on the part-time job you would still get $395 from unemployment. The only time you wouldn't get any money from unemployment is if you make more than your weekly benefit amount. So if you make $400 at the part-time job, then you will receive nothing from unemployment.
Of course, this is all assuming that you are meeting all of the other requirements in terms of continuing to search for a full-time job and being able and available to start one if it were offered to you.