Two alleged heroin drug dealers have pleaded not guilty after arrests following a threemonth investigation by the East Ventura County Narcotics Street Team and the Simi Valley Police Department's Narcotic Unit.

Van Nuys residents Wilfredo Chavarria, 24, and Osmar Robles, 27, were arrested Sept. 16 for allegedly selling heroin to various buyers in Thousand Oaks and Simi Valley.

They were charged with felony possession of a controlled substance and felony transporting to sell a controlled substance.

About 50 grams of heroin and $2,500 was seized during the investigation, authorities said.

Robles and Chavarria were booked into the main jail in Ventura. A bail of $50,000 was set for Robles. A $250,000 bail was set for Chavarria.

"We are still investigating and more arrests are expected," said Sgt. Bob Thomas of the Thousand Oaks Police Department.

Both men were arrested in Van Nuys, Thomas said— Chavarria outside his apartment and Robles at a shopping center.

The 50 grams of heroin was packaged in small quantities, with about 1 gram in each bag. Each of the bags sells for about $100, bringing the total 50 grams to about $5,000 in value, Thomas said.