Attorney Art Kaminsky, who is attempting to form a group of investors to keep the Capitals hockey team in Washington, is due in town either today or Wednesday for talks with club owner Abe Pollin.

A source familiar with the Capitals' situation indicated that Kaminsky's group apparently represents the only ongoing negotiation that would keep the team in Washington.

Kaminsky told The Washington Post last week that he represented a group of New York businessmen interested in purchasing the Capitals.

He also indicated his group, which he declined to identify, wanted to keep the team in Washington. Neither Pollin nor Kaminsky was available to comment yesterday.

Former Capitals coach Gary Green also had been working to put together a group, and an unidentified Los Angeles businessman had expressed interest as well. The status of their efforts could not be determined.

Meanwhile, the Save the Caps Committee continued its belated attempt to produce a sufficient groundswell of local interest to persuade Pollin to retain ownership of the team.

"Losing sports teams is becoming a habit we can ill afford," stated a flyer distributed by the committee and referring to the loss of the baseball Senators and soccer Diplomats.

The committee, according to spokesman Larry White of Olney is asking hockey fans to pledge purchases of season tickets with the aim of influencing Pollin's intentions.

"I talked with Mr. Pollin and he promised to rethink his position . . . ," White said. "We know we haven't much time. But I just can't think of losing the Caps, no matter what the reasons behind it. I first went to a game four years ago and I fell in love with it and bought four season tickets. Since then, seven of my employes have become fans who never saw hockey before.

"I know hockey will succeed here, if it is promoted properly. But this isn't the time to talk about the mistakes that have been made in the front office. We just want to keep the team."

Diane Jackson, a longtime Capitals fan once voted NHL fan of the year, is attempting to organize a Save the Caps Day, with fans flooding TV studios and newspaper offices with calls on a designated day. However, she cited the short time available for organization of any campaign.

"If we had been told in March or April that things were this serious, we would have had an easier time getting things going," Jackson said. "But until a couple of weeks ago, we all felt that Mr. Pollin's statement about the Caps being here until the year 2000 settled things."

For further information, call 924-4092 or write to Larry White, Chairman, Season Ticket Sales, Save the Caps Committee, 18329 Village Mart Dr., Olney, Md. 20832.