The Montgomery County Board of Appeals today will hear the following requests for variances and special exceptions to zoning laws. Hearings will begin at 9 a.m. in the third-floor hearing room of the Stella B. Werner Council Office Building, 100 Maryland Ave., Rockville. For more information, please call 279-1226. CHEVY CHASE

DE RUSSEY PKWY., 4620 -- A variance request by E. Karl Bastress to build an addition onto a house four feet from a side property line instead of the minimum seven feet required. DERWOOD

MUNCASTER RD., 19200 -- A variance request by Walter J. Gilford to allow a swimming pool to remain in the side yard. It is required to be in the rear yard. GAITHERSBURG

TURKEY FOOT RD., 14101 -- A variance request by Richard A. Heald to build and operate a private riding stable in a residential zone. ROCKVILLE

CATALPA CT., 17049 -- A special exception request by Marian F. Brooks to operate a day care center for up to 40 children in a residential zone.

MAZWOOD RD., 6220 -- A variance request by Jeffrey Rohlfs to build a detached garage in a front yard instead of in the rear yard as required.

SYCAMORE LA., 16111 -- A variance request by Ronald J. Lamburt to build a detached garage in a side yard instead of the rear yard as required.