Where else did you get in and what were your stats?
Before going too far down this path, you should know that CP SLO is a very difficult place to transfer into, unless you attend a local CC like Cuesta. Last year, they admitted just 1600 transfers and had an acceptance rate around 18% - vs 30% for freshman applicants.
https://admissions.calpoly.edu/prospective/profile.html
The transfer acceptance rate for Cuesta applicants is nearly 50%.
https://admissions.calpoly.edu/prospective/profile.html
This means the avg transfer GPA is diluted significantly by their Cuesta preference.