Sector A: This Sector includes nineteen subsectors on the Lytle Creek Fan in and around the City of Fontana. Includes subsectors A-4-a, A-4-b, A-4-c, A-7-a, A-7-b, A-7-c, A-8-a, A-8-b, A-9-a, A-9-b, A-13-a, A-14, A-16-a, A-16-b, A-17-a, A-19-a, and A-19-b, The larger subsectors are north of Fontana; several smaller subsectors are scattered to the east and south of Fontana to the Santa Ana River.

Sector B: This Sector includes twelve subsectors covering the unurbanized portions of Lytle Creek Wash from north of Freeway 15, west to the downtown area of the City of San Bernardino. Includes subsectors B-1-a, B-1-b, B-5-a, B-5-b, B-5-c, B-6-a, B-7-a, B-8, B-9. B-10, B-14, and B-15.

Sector C: This Sector includes fourteen subsectors along the Cajon Creek Wash from the bend in the wash south of Lost Lake, southward to the confluence of Cajon Creek and Lytle Creek. Includes subsectors C-1-a, C-1-b, C-3-a, C-4-a, C-5-a, C-5-b, C-5-c, C-6-a, C-6-b, C-6-c, C-6-d, C-6-e, C-8, and C-10-a.

Sector E: This Sector includes fifteen subsectors in and along the Santa Ana River from Freeway 395, south and west to the town of Rubidoux. Includes subsectors E-1, E-2-a, E-5-a, E-9, E-10-a, E-10-b, E-13-a, E-13-b, E-14-a, E-17-a, E-19, E-20, E-22, E-23, and E-24-a Sector F: This Sector includes eighteen subsectors along the upper Santa Ana River and Santa Ana Wash and areas along smaller drainages merging with the Santa Ana Wash, including Warm Creek, City Creek, and Mill Creek. Includes subsectors F-2-a, F-3-a, F-6-a, F-6-b, F-9, F-14-a, F-14-b, F-15-a, F-15-b, F-15-c, F-16-a, F-17-a, F-18, F-20-a, F-23-a, F-23-b, F-32-a, and F-33.

Subsector G-1: This Sector includes subsectors G-1-a, G-1-b and G-1-c. These subsectors cover parts of the San Gorgonio River alluvial fan, east of the City of Banning, and extends from the mouth of Banning Canyon.

Subsector G-2: This Sector includes subsectors G-2-a, G-2-b, and G-2-c. These subsectors cover parts of the San Gorgonio River alluvial fan, west and south of the community of Cabazon.

Subsector J-1: This subsector is bounded to the southeast by the 15 Freeway and on the northwest by Lytle Creek Road. It is adjacent to Sector B-2 on the northeast.

Subsector J-2: This subsector is northeast of the 15 Freeway.

Subsector J-3: This subsector is bounded on the northwest by the 15 Freeway, on the east by Citrus Avenue, and on the south by Duncan Canyon Road.

Subsector J-4: This subsector is bounded on the southeast by a transmission line, on the northwest by the 15 Freeway, and on the west by Citrus Avenue.

Subsector J-5: This subsector is bounded on the south by a utility corridor, on the west by a transmission line, and on the northwest by the 15 Freeway.

Subsector J-6: This subsector is bounded on the north by a transmission line and utility corridor, on the west by Citrus Avenue, on the east by Sierra Avenue, and on the south by Highland Avenue.

Subsector J-7: This subsector is bounded on the south by a utility corridor, on the north by Duncan Canyon Road, on the east by Sierra Avenue, and on the west by Lytle Creek Road.

Subsector J-8: This subsector is bounded on the north by a utility corridor, on the south by a transmission line, on the west by Lytle Creek Road, and on the east by Sierra Avenue.

Subsector J-9: This subsector is bounded on the north by Summit Avenue, on the east by Citrus Avenue, and on the south by La Sierra Drive.

Subsector J-10: This subsector is bounded by Sierra Avenue on the west, by Windflower Avenue on the south, and by Mango Avenue on the east.

Subsector J-11: This subsector is bounded on the east by Alder Avenue, on the north by Summit Avenue.

Subsector J-12: This subsector is bounded on the east by Alder Avenue. The Mid-Valley Landfill Pit operated by Robertson's Ready Mix Concrete Company is in this Sector.

Subsector J-13: This subsector is bounded on west by Ayala Drive and on the south by Jerry Eaves Park.

Sector K: This Sector is north of Lake Elsinore, on the northeast corner of the Corona Freeway and Nichols Road. The area is the site of an active crushed-stone quarry operated by the Pacific Aggregates, Inc.

The following Sectors are identified by the State Geologist for termination of designation status due to high-value incompatible land use developments. These areas are shown on the accompanying Plates.

Subsector A-4: This Sector includes subsectors A-4-d, A-4-e, A-4-f, A-4-g and A-4-h which are now covered by housing developments, freeway and freeway interchange.

Subsector A-6: This Sector is north of Highland Avenue and is now covered by the State Route 210 Freeway.

Subsector A-7: Includes subsector A-7-d, which is now covered by housing developments, urbanization and freeway.

Subsector A-8-c: Most of this subsector is covered by housing development.

Subsector A-9: Includes subsector A-9-c, which is now covered by housing development.

Subsector A-13: Includes subsector A-13-b, which is covered by housing development.

Subsector A-15: This subsector is in an area south of Foothill Boulevard, east of Beech Avenue, north of Arrow Route, and west of Lime Avenue, and is covered by industrial development.

Subsector A-16-c: This subsector is now mainly covered by industrial development.

Subsector A-17: Includes subsectors A-17-b and A-17-c, which are now covered by Industrial development.

Subsector A-18: This subsector is south of Arrow Boulevard and north of the Burlington Northern-Southern Pacific Railway Line, between Beech and Lime Avenues. Industrial development now covers this Sector.

Subsector A-19-c: This subsector, on the northwestern corner of Citrus Avenue and the Burlington Northern-Southern Pacific Railway Line, is now covered by industrial development.

Subsector A-23: This subsector is south of Freeway 10, north of Slover Avenue and east of Sierra Avenue. Urban and industrial development now covers this Sector.

Subsector A-24: This subsector is south of Slover Avenue and north of Santa Ana Avenue, between Spruce and Cactus avenues. Housing development now covers the Sector.

Subsector A-27: This subsector is south of Santa Ana Avenue and north of Jurupa Avenue, between Lilac and Cactus avenues. Housing and industrial development now covers this Sector.

Subsector A-28: This subsector is between Hall Avenue and South Riverside Avenue, and northwest of Agua Mansa Road, is now covered by housing development.

Subsector A-29-b: This subsector is between Hall Avenue and South Riverside Avenue, and northwest of Agua Mansa Road, is now covered by housing development.

Subsector A-30: This subsector is between Hall Avenue and South Riverside Avenue, and northwest of Agua Mansa Road, is now covered by housing development.

Subsector B-2: The northern and northeastern part of the subsector, south of Freeway 210 and west of Brampton Avenue is now covered by housing development.

Subsector B-5: Includes subsectors B-5-d, B-5-e, B-5-f, B-f-g, B-5-h and B-5-i: The northern and northeastern part of the Sector, south of Freeway 210 and west of Brampton Avenue is now covered by housing development.

Subsector B-6-b: The northern and northeastern part of the subsector, south of Freeway 210 and west of Brampton Avenue is now covered by housing development.

Subsector B-7-b: The northern edge of the subsector is now covered by the State Route 210 Freeway.

Subsector B-12: This subsector is now covered by industrial development.

Subsector B-16: This subsector is now covered by industrial development.

Subsector B-17: This subsector is now covered by industrial development.

Subsector C-3-b: The subsector east of Little League Drive is now covered by urban development.

Subsector C-4-b: The subsector east of Little League Drive is now covered by urban development.

Subsector C-10-b: The subsector east of Cable Creek is now covered by housing development.

Subsector D-2: This subsector is now covered by industrial development.

Subsector D-3: This subsector is now covered by industrial development.

Subsector D-4: This subsector is now covered by industrial development.

Subsectors D-5: This subsector is now covered by industrial development.

Subsector D-6: This subsector is comprised of two subsectors, D-6-a and D-6-b, which are now covered by industrial development.

Subsector E-2-b: This subsector is now covered by industrial development.

Subsector E-4: This subsector is now covered by industrial development.

Subsectors E-5: This subsector is comprised of two subsectors, E-5-b and E-10-c, which are now covered by industrial development.

Subsectors E-10: This subsector includes three subsectors, E-10-c, E-10-d and E-10-e, just east of South Riverside Avenue and north of the Santa Ana River which are now covered by industrial development.

Subsector E-13-c: The subsector along the south side of Pellisier Road is now covered by industrial development.

Subsector E-14-b: The subsector along the south side of Pellisier Road is now covered by industrial development.

Subsector E-17-b: This subsector in and along the Santa Ana River from Freeway 395, south and west to the town of Rubidoux, is now covered by industrial development.

Subsector E-24-c: This subsector, along Crestmore Road, is now covered by housing development.

Subsector F-1: This subsector is mostly covered by urban development.

Subsector F-2-b: This subsector is now covered by housing development.

Subsector F-3-b: This subsector is now covered by housing development.

Subsectors F-4-a, F-4-b, F-4-c, and F-14-d: These subsectors are now covered by housing development.

Subsector F-5: This subsector is now covered by housing development.

Subsector F-6: This subsector includes subsectors F-6-c, F-6-d and F-6-e which are now covered by industrial development.

Subsector F-12: This subsector is now covered by industrial development.

Subsectors F-14-c and F-14-d: Parts of these subsectors are now covered by housing development.

Subsector F-15: This Sector includes subsectors F-15-d, F-15-e, F-15-f, F-15-g and F-15-h, which are now covered by housing and other urban development.

Subsector F-16-b: This subsector is now covered by industrial development.

Subsector F-17-b: This subsector is now covered by industrial development.

Subsector F-20-b: This subsector is now covered by industrial development.

Sector F-23: This subsector includes subsectors F-23-c and F-23-d, which are now covered by industrial development and a bridge.

Sector F-32-b: This subsector is now covered by industrial development and a bridge.

Sector G: This Sector includes three subsectors, G-1-d, G-1-e and G-1-f, covering parts of the San Gorgonio River alluvial fan, northeast of the City of Banning, and extends from the mouth of Banning Canyon. These subsectors are now covered by housing and other urban development.

Sector H: This Sector is now depleted.

Sector I: This subsector is now covered by housing and other urban development.