If you look at 11 USC 1182(a)(2)(B),
Quote Quoting (B) Multiple criminal convictions
Any alien convicted of 2 or more offenses (other than purely political offenses), regardless of whether the conviction was in a single trial or whether the offenses arose from a single scheme of misconduct and regardless of whether the offenses involved moral turpitude, for which the aggregate sentences to confinement were 5 years or more is inadmissible.
Also, See 8 USC 1227(a)92)(A)(ii):
Quote Quoting (ii) Multiple criminal convictions
Any alien who at any time after admission is convicted of two or more crimes involving moral turpitude, not arising out of a single scheme of criminal misconduct, regardless of whether confined therefor and regardless of whether the convictions were in a single trial, is deportable.
Consistent with that, it is my understanding that the USCIS will apply the petty offense exception to multiple petty offenses arising out of a single incident of misconduct.

If you want, you can talk to your lawyer about negotiating to have your plea deal for one of the charges set aside with an outright dismissal substituted for the conditional dismissal, although that generally takes a sympathetic judge and prosecutor.