AN ASSISTANT BASEBALL COACH IN SALINAS HAS BEEN ARRESTED ON DRUG CHARGES. OFFICIALS SAY 55-YEAR-OLD RONALD STEVENS WAS CAUGHT BUYING COCAINE BEHIND NORTH SALINAS HIGH SCHOOL AROUND 4 P-M YESTERDAY (WED). THE ARREST WAS MADE AFTER A SEVERAL WEEK INVESTIGATION FOLLOWING REPORTS OF DRUG DEALS NEAR CAMPUS. THE ALLEGED DRUG-DEALER, 56-YEAR-OLD ALBERTO MANRIQUEZ, WAS ALSO ARRESTED.