The owners of a large Washington construction company instructed their secretary to perform work as part of his corporate responsibilities on a house being built for Teamster president Francis C. DeBrouse, the secretary testified yesterdy.

Robert P. Jenkins, corporate secretary of Excavation Construction Inc., said he arranged for structural plans for the house, drew up a propsed contrct and oversaw construction of the house.

At the time, Teamsters in DeBrouse's local were at work on projects involving millions of dollars to Excavation Construction.

The House in Davidsonville Md., was built by Lyon Buildres, Inc., whose president, John W. Lyon, owns half of Excavation Construction. Lyon and Larry A. Campbell, the other owner of Excavation Construction, directed Jenkins to wolk on the residential construction project.

DeBrouse paid about $150,000 less than the cost of the house which another witness described yesterday as "palatial."

DeBrouse is on trial for labor-management racketeering, extortion and tax fraud in federal court here in connection with more than $200,000 in goods and services the prosectuion contends he used his union position to obtain. Included in that figure is the money DeBrouse bever paid for the house.

Excavation Construction Inc. filed a civil suit to recover the money after some of the company's officials had been called before a federal grand jury to testify, prosecutors said.

Jenkins testified under a court order and under a grant of immunity which prevents anything he says from being used in legal proceedings against him except in the case of perjury. He was questioned extensively about two bills for structural plans for the DeBrouse house which prosecutor Robert A. r/ohrbaugh said had been altered.

"Isn't it correct to say you had that 'DeBrouse house' whited out and you wrote on the bottom of the statement 'E.C. Office Building, preliminary Drawing'?" Rohrbaugh asked.

"I don't recall doing that... I can't recall why I did that or for what reason... I can't recall doing it," Jenkins answered.

"I don't recall doing it," said Jenkins.

Also testifying today was Israel Cohen. president and chairman of the board of Giant Food. Cohen denied that DeBrouse had ever threatened the food chain with economic harm if it failed to deliver $7,000 worth of carpet DeBrouse had requested. Giant never sued DeBrouse when DeBrouse failed to pay the bill for the wholesale cost of the carpeting, he said. "In the real world you don't go around suing the president of a union. I don't think it makes good business sense," said Cohen. He called what Giant did for DeBrouse "an accommodations".