This is a summary of selected contracts awarded by the federal government to companies and other vendors in Virginia, Maryland and the District.

Orkand Corp. in Silver Spring won a $26,603,939 contract from the Department of Energy for data collection, systems programming, analysis and reports.

ARC Professional Services Group Inc. in Rockville won a $9,596,234 contract from the Army to operate and maintain a government facility.

Raytheon Service Co. in Virginia Beach won a $5,616,721 contract from the Navy to repair components of the NATO Sea Sparrow and Tartar systems.

Arinc Research Corp. in Annapolis won a $3.4 million contract from the Air Force for expert and consultant services.

Callas Contractors Inc. in Hagerstown, Md., won a $2,203,709 contract from the Army to replace underground storage tanks at various buildings in Fort Ritchie, Md.

The International Science and Technology Institute in Washington won a $1,645,996 contract from the Agency for International Development for technical assistance in family planning management information for Africa and Latin America.

Westinghouse Electric Corp. in Hunt Valley, Md., won a $1,273,958 contract from the Air Force for engineering technical services for the F-16 fire control radar system and associated weapons control systems.

Photocraft Inc. in Gaithersburg won a $1,217,929 contract from the Navy for photographic lab support services.

Comsat Systems Division in Clarksburg, Md., won a $991,493 contract from the Air Force for national transportable telecommunications capability services.

Scientific and Commercial Systems Corp. in Alexandria won a $962,597 contract from the Environmental Protection Agency for support for the Office of Air and Radiation.

C.B.C. Enterprises Inc. in Norfolk won a $924,000 contract from the Navy to repair 84 family housing units.

Glenn E. Waltz Plumbing and Heating Inc. in Frederick, Md., won an $819,147 contract from the Army for air conditioning for two buildings at Fort Ritchie, Md.

Blueridge General Inc. in Norfolk won an $808,000 contract from the Navy for structural and electrical repairs to the Longbird Bridge.

Elrich Contracting Inc. in Capitol Heights, Md., won a $670,980 contract from the Army to renovate a building at Fort Belvoir.

International Shelter Systems Inc. in Baltimore won a $639,908 contract from the Navy for movable office space for several departments.

Systex Inc. in Beltsville, Md., won a $554,805 contract from the Navy for system-programming support services.

Israel Military Industries Services in Chevy Chase won a $499,900 contract from the Navy to supply IMI 60mm cannon spare parts.

Artic Energies Ltd. in Severna Park, Md., won a $498,366 contract from the Navy to investigate the feasibility of converting energy sources for use in small submersibles.

Richmond Ambulance Service in Newport News won a $486,940 contract from the VA Medical Center for ambulance services.

Angel Systems in Chesapeake Beach, Md., won a $484,151 contract from the Navy for pest control services.

Advanced Resource Development Corp. in Columbia, Md., won a $481,517 contract from the Navy for signal-feature analysis using neural networks and psychoacoustics.

International Science and Technology Institute Inc. in Washington won a $470,863 contract from the Agency for International Development for research support services to black colleges and universities.

Systems Support Inc. in Great Falls won a $404,555 contract from the Navy for research.

Arinc Research Corp. in Annapolis won a $400,000 contract from the Air Force for expert and consultant services.

Arinc Research Corp. in Annapolis won a $400,000 contract from the Air Force for engineering services.

E.C. Campbell Inc. in Woodbridge, Va., won a $356,061 contract from the Air Force for a mechanized material handling system.

United Industrial Services Inc. in Beltsville won a $267,322 contract from the Navy to construct prefabricated buildings.

Valentine Electric in Hagerstown, Md., won a $265,200 contract from the Army to replace a heat plant and install air conditioning in family housing.

Elrich General Contractors Inc. in Forestville won a $263,777 contract from the Air Force to repair dormitory latrines.

Waters Craftsmen Inc. in Front Royal, Va., won a $243,462 contract from the Army to restore a stained glass window at a chapel in West Point, N.Y.

Kopflex Corp. in Baltimore won a $240,000 contract from the Navy to refurbish a clutch.

Martin Surfacing Inc. in Cockeysville, Md., won a $239,994 contract from the Navy to replace synthetic floors in the Halsey Field House in Annapolis.

Mid Atlantic Contractors in Olney won a $237,944 contract from the Army for interior painting and maintenance to family housing units at the Walter Reed Army Medical Center.

PAR Enterprises Inc. in Clifton, Va., won a $218,930 contract from the Navy for pilot scale demonstrations at Pensacola, Fla.

J&D Installation Contractors Inc. in Monrovia, Md., won a $191,409 contract from the Navy for renovations.

R&N Contractors Inc. in White Plains, Md., won a $189,000 contract from the Navy to enclose the rear porch of a building.

Harwel Construction Co. in Cockeysville, Md., won a $189,000 contract from the Veterans Administration Medical Center to replace air conditioning units.

G.W. Mechanical Contractors Inc. in Upper Marlboro won a $181,669 contract from the Air Force to replace air conditioning.

Building Systems Contractors Inc. in Cabin John won a $177,322 contract from the Air Force to construct a mechanical room and replace the air conditioning in a building.

Science Applications International Corp. in McLean won a $161,373 contract from the Navy for experimental, development, test and research work.

MAX of D.C. in Alexandria won a $159,000 contract from the Navy to upgrade two buildings.

O'Donnell Construction Co. in Washington won a $152,000 contract from the Army to supply dumpster pads.

Humrro International Inc. in Alexandria won a $139,969 contract from the Navy for studies and analyses in support of the Defense Department selection program.

Booz Allen & Hamilton Inc. in Bethesda won a $139,298 contract from the IRS to measure the comprehension levels of tax form instructions.

Defense Technology Inc. in Arlington won a $123,262 contract from the Navy for systems engineering services.

ST Systems Corp. in Lanham won a $115,654 contract from the Navy for display and animation systems for the looping of satellite imagery.

Union Express in Washington won a $107,310 contract from the Labor Department for courier services.

Mechanics Inc. in Springfield won a $104,460 contract from the Navy to repair a building.

John G. Kolbe Inc. in Richmond won a $102,350 contract from the Marine Corps for services and trade equipment.

National Academy of Sciences in Washington won a $100,000 contract from the Navy for information technology services.