The scenic $1 million golf course the Northern Virginia Regional Park Authority proposes to build on Mason Neck with views over Pohick Bay received unanimous support from a crowd of about 40 persons at a public hearing last night.

The only concerns were about possible increases in traffic on Gunston Road, estimated to rise about 6 percent when the golf course opens in late 1980, and possible harm to the 18th century Lebanon Plantation house by using it as a golf clubhouse.

Park authority board member and Mason Neck environmentalist Elizabeth Hartwell said of the house, "it's not a mansion... like (nearby) Gunston Hall... just a farm house, a nice old farm house," she said. It will be restored and better preserved by being used, she said.

The Park Authority has yet to give final approval for the golf course, although funds have been approved in Park bond referendums.

Several residents asked that horseback riding trails be included in the large 460-acre site and a bicycle trail along its front on Gunston Road.

The Park Authority proposed the golf course as a means of preserving the Lebanon Plantation and the marshes around it while opening them to limited public recreation.