08/29/2001 12:00AM



COLUMBUS, Neb. - Don Herber, fourth in the standings at Columbus with 10 wins, received a 30-day suspension last Friday for the presence of a controlled substance in his system, effectively ending his meet here.

Alejandro "Alex" Granda arrived from Canterbury Park last week and collected two wins over the weekend.

Jorge Collazo Jr. arrives this weekend from Prairie Meadows to boost a colony that has less than 15 active riders.

* Jerry Carkeek has taken control of the rider standings, moving out to a 30-19 lead over Armando Martinez. Carkeek padded his lead by riding the first four winners on last Saturday's eight-race card.