The Loudoun County Board of Supervisors adopted an aggressive economic plan last month that calls for more commercial and industrial development in the Dulles corridor and will lure more business to the region.

"The growth will center in the region between the Dulles International Airport, Leesburg and the intersection of routes 7 and 28," said June Bachtell Wilmot, director of the Loudoun County Department of Economic Development.

"There won't be any extensive commercial or industrial development west of Leesburg, unless someone decides to put in water and sewage," she said.

The plan, which was prepared by the Department of Economic Development, aims to increase the business sector's share of the tax base to 25 percent. Last year, about 18.5 percent of Loudoun's tax base came from property taxes on business, up about 2 percent from 1984.

There is no intention of hurting county agriculture, Wilmot said; rather, the strategy is expected to provide the increased tax returns needed to preserve agriculture, which remains the county's largest industry.

"For example, if a farmer's land value is estimated at $4,000 an acre and his crops bring in $500 an acre, he is taxed on the $500. We need an increased tax base to support that program," Wilmot said.

Residents appear to be in favor of the plan, said Ann Kavanagh, a county supervisor who represents the Dulles district, where most of the growth will occur.

"I think people are becoming more educated about bedroom communities, where the burden of the taxes falls on them. With an increase in commercial development, the additional taxes help to keep the residential rates lower," Kavanagh said.

In the past, people have expressed opposition to sprawling residential communities that would generate a need for more schools, roads and stores and drive taxes upward, she added.

"In Loudoun County, we don't want overwhelming growth that would create a hodgepodge of industrial and commercial sites. We want growth in moderation. If developers respect our criteria for quality of life, then we welcome the opportunity to work with them," Kavanagh said.

Last year, twice as many businesses moved to Loudoun as in 1984, most of them locating around Dulles airport.

Nonresidential construction also has boomed, increasing 300 percent between 1981 and 1985, with 1.7 million square feet of vacant commercial space.

American Satellite Co. of Rockville signed an agreement last week with Long Distance USA of Honolulu that will enable the company to offer its first commercial line service to Hawaii this November.

Under the agreement, ASC will provide digital transmission capacity, operations and maintenance facilities to the Hawaiian company and will build and an earth station in Honolulu. The facilities will provide voice, data and video service to Hawaii. Long Distance USA is the major reseller of telecommunications services in Hawaii.

"We have had five dedicated government earth stations in the Hawaiian islands for some time, but the Honolulu site is our first station for commerial service to the area," said George P. Roberts, president of ASC.

Washington will be one of the six cities serviced by the Hawaiian link.

HAY Systems Inc. of the District, a division of The HAY Group Inc. until April, received a major Army contract and will open offices in Orlando, Fla., and Phoenix July 1, a company spokesman said.

HAY Systems broke off from The HAY Group, which is owned by Saatchi and Saatchi PLC of Britain, to obtain facility clearance from the government. The company provides "forecasting consulting," which is the forecasting of the number and skill level of employes needed to maintain and operate high-technology systems. Most of the company's work involves defense contractors.

The company received a $2.25 million contract from Automation Research Systems Ltd. in Arlington for an Army project. Under the contract, HAY Systems will teach the Army how to use the forecasting technology.

Second National Building & Loan Inc. of Maryland received regulatory approval last week to open its fifth branch in Delaware.

The branch will be located in Dover, Del. Second National became the first out-of-state thrift admitted to full-service banking in Delaware through a merger with Lewes & Rehoboth Building & Loan in 1984.

The Menesha Corp. of Neenah, Wis., once the world's largest producer of wooden butter tubs, will move its headquarters and manufacturing plant to Danville, Va., providing 125 new jobs for area residents.

The Danville facility will be the administrative, sales, marketing and manufacturing center of the business, and the SUS-RAP division will produce specialized packaging material. Menasha is interviewing prospective management employes.

The company reported sales of $300 million in 1985.

Stanley Works, a tool manufacturing company in Connecticut, will open a 148,000-square-foot distribution center for its hardware division in Henrico County, Va., by the end of next year.

The company plans to hire between 30 and 40 local employes to operate the center and is negotiating the purchase of the vacant Chrysler Corp. building for the facility. The price of the building was not disclosed. Last year, the company reported $1.2 billion in sales.

Stockholders of Guaranty Bank and Trust Co. of Virginia approved a 6 percent stock dividend and a 3-cent cash dividend per share outstanding. Stockholders of record last Friday will be issued six-tenths of a share for each 10 shares held and 0.3 cent for each share. This will increase the number of shares outstanding from 1.13 million to 1.2 million. The stock dividend will be issued on July 11.