Prince William County supervisor Kathleen Seefeldt was honored recently by the American Planning Association for what it called "her outstanding contributions to local planning." Seefeldt was selected by the Virginia chapter of the association after being nominated by county planning director Roger Snyder for "significant contributions to and support of land-use planning at the local government level." Snyder said he nominated the Occoquan supervisor because during her six-year tenure as board chairman Seefeldt led a successful effort to update the county's land-use plan, its zoning ordinance and its subdivision regulations. "It was Ms. Seefeldt's attention to process that sets her apart from other public officials and citizens who have also made contributions to planning," Snyder said.

A new ordinance requiring all gas stations in the county to display fuel prices becomes effective Sunday. Approved by the Board of Supervisors in February, the ordinance requires stations to display at least two but no more than three signs attached to posts or poles, as long as more than one kind of fuel is sold. According to county director of consumer affairs Hubert King, gas stations that do not comply could face misdemeanor charges punishable by a $100 fine.

In addition, County Executive Robert Noe said that in the event of a fuel shortage, all gas retailers must display large color-coded signs to signal fuel availability. Green would indicate all gas products are available, yellow that all but unleaded are available and red that there is no gasoline on hand. This will help motorists avoid long lines during a shortage, Noe said.

Seven Prince William County high school seniors are finalists in the National Merit Scholarship program, according to school spokeswoman Kristy Larson. They are Michael Rahilly of Brentsville High School, Brown Carpenter and Coleen Stumm of Gar-Field, A. Tedd Roseberry and Douglas Slothouber of Osbourn Park, Kimberly Whited of Woodbridge High and Earl Schoenborn of Thomas Jefferson High School for Science and Technology.

In addition, Gerald Cephas, William Hundley and Denise Peters, all Gar-Field seniors, are finalists in the National Achievement Program for Outstanding Black Students. Red Geranium Is Occoquan's Flower

The Occoquan Town Council last year declared the red geranium the official town flower and, in keeping with that, the Merchant's Association designated Saturday as the town's First Annual Geranium Day. Forty-five shops will display the bright blooms and participate in individual drawings for geranium filled hanging baskets. Residents and merchants will join in the display with 1,200 pots of geraniums in gardens, corner barrels, windows and the municipal park and around the Ebenezer Baptist Church. Drawings for the hanging baskets will be held Saturday evening; the winner does not have to be present, according to a spokesman. Dumfries to Celebrate Charter Day

The town of Dumfries will celebrate its Charter Day at 4 p.m. Sunday in Merchant Park. The town, which received its charter May 11, 1749, is the oldest incorporated town in Virginia operating under a colonial charter. According to Anne Flory of Historic Dumfries, Inc., the theme of the event is the bicentennial of the Virginia statute for religious freedom, drafted by Thomas Jefferson in 1777. Dr. Randolph Yaeger, a Woodbridge Baptist Church Sunday School teacher, will speak on the role of the statute's dissenters, who were primarily Baptists, Flory said. In addition, a community choir will sing and The Good Old Boys Marching Band will perform. Residents may bring a picnic lunch and spend a day at the park, Flory said. For information, call 221-3346.

Quantico Marine Band Concert Set

The Quantico Marine Band will present a John Philip Sousa concert Saturday in the new riverfront park at 7 p.m. For information, call 640-2741. Woodbridge Art Guild to Hold Arts Show

The Woodbridge Art Guild will offer its 16th annual fine arts show at Tackett's Mill from 10 a.m. to 6 p.m. Saturday and from noon to 6 p.m. Sunday. Call 494-3676 for information. FAA Approves Leesburg Airport Contract

The Federal Aviation Administration last week approved the amount of nearly $600,000 for a contract awarded by Leesburg officials to William Hazel Inc. Once the contract document itself is approved by the FAA, the company will pave two aprons and resurface a relocated parking lot at the Leesburg Municipal Airport. The facility, which now accommodates 140 airplane tie-downs, will accommodate 40 more, including corporate jets, when the work is finished, a spokesman said. Once the paving is finished, construction of hangers for the jets will begin. Bluemont Library Fund Raiser Draws 200

More than 200 people heard award-winning local authors Henry Taylor, Russell Baker and Jake Page read from their works at a benefit performance held recently to help the fledgling Bluemont Library buy books. The turnout was "unexpectedly large" and brought more than $600 to the facility's coffers, according to spokeswoman Jean Gray. The library will be located in the unused Bluemont schoolhouse, where the reading took place. It was, Taylor said, his first public appearance since winning his Pulitzer prize for a book of poems, "The Flying Change." Students to Dress up Water Tower

Art students from Loudoun Valley High School have designed the decor for Purcellville's new water tower, according to Mayor Ron Masters. The design includes the town's logo, on a blue background to "blend with the sky," and a yellow or green strip. It also says, "Home Of The Vikings," the name of Loudoun Valley's football team.

According to Town Manager William Dennis, the Town Council has approved a $3,000 feasibility study to determine if Purcellville can afford to build a new dam to increase its water supply. The study will begin this week. Officials have said that, effective July 1, water rates may increase from $1 per 1,000 gallons to $2.90 per 1,000 gallons. The council will vote on the measure next week. Dennis also said the council will consider a new policy that will require customers to pay a minimum deposit to ensure payment of bills. Currently, Dennis said, if a customer refuses to pay a bill the town has no official policy on how to collect the money. Hamilton Well to Begin Operation

Hamilton's new well, located on the Hamilton Acres development, is expected to begin operation this week, according to Mayor Harold Lowry. This will bring to nine the number of wells operating in Hamilton and will allow officials to lift an in-town moratorium on new hookups, which has been in effect since last August. Officials said the moratorium was adopted because of a steady drop in water levels in the other eight wells. Round Hill Water Line Contract Approved

The Round Hill Town Council recently awarded a $48,000 contract to the Dewberry & Davis engineering firm to do the design work on its in-town water line replacement project. According to Mayor Jeff Wolford, the firm will complete its work in August, and bids for construction on 85 percent of the town's water lines will go out in October. The project will be paid for with a $700,000 state community grant and $105,000 from the town budget. Goose Creek Herb Guild to Hold Sale

The Goose Creek Herb Guild will hold its annual herb plant sale tomorrow from 10 a.m. to 2 p.m. at the Middleburg Community Center on Rte. 50. The guild will offer more than 2,000 plants of both well known and lesser known herbs; among the varieties on sale will be marjoram, basil, thyme, savory, lemon verbena and Lady's Mantle. Interested persons may tour the herb garden, which is cultivated and maintained by the guild at the community center. Spokeswoman Carol Lackey said the guild will also cultivate an herb garden next to the Loudoun Museum in Leesburg. Sharon Kearns, guild president, said guild membership costs $7.50 a year and includes speakers, workshops and field trips to learn more about cultivating and using herbs. The guild has meetings from March through November, on the third Thursday of the month, at 10:30 a.m. at the community center. Call 777-8420 for information. Book Sale at Oatlands Plantation

Oatlands Plantation, on Rte. 15 six miles south of Leesburg, will hold its annual used book sale Friday and Saturday from 10 a.m. to 4 p.m. and Sunday 1 p.m. to 4 p.m. in the Carriage House. Proceeds will be used to maintain and restore the mansion's antique furnishings. Used books, with the exception of textbooks and magazines, may still be delivered to the Carriage House, according to spokeswoman Nan Giles. All donations are tax deductible. For information, call 777-3174. Hospital Week at Loudoun Memorial

In recognition of National Hospital Week May 11-17, Loudoun Memorial Hospital has scheduled special events for employes and the public based on the theme "Hospitals Make Healthy Neighbors." The hospital will offer tours of the cardiac treatment center, stress lab, mental health unit and mammography unit. In addition, there will be a demonstration of Lifeline, an emergency response system. Visitors are also welcome to tour the rehabilitation center. For information on days and times call 703-771-2850 or 478-1801, Ext. 2620, toll free from Washington.

Participants in the Loudoun Road Races sponsored by the hospital, slated for 8 a.m. Saturday at the Catoctin Elementary School, may register tomorrow from 6:30 p.m. to 9 p.m. at the hospital, or Saturday from 6:30 p.m. to 7:30 p.m. at Loudoun County High School. Events will include 10-mile, 5-mile and one-mile races and a "tot trot" for children under 7. Entry fees are $7 for individuals and $15 for families. Parking, showers and lockers will be available at the high school. For information call 771-2850 or the metroline 478-1801, Ext. 2620, which is toll free from Washington.