1. Demolition Debris Subarea (IR01)
This subarea comprises a demolition debris disposal area north of the IWTP overflow pond and
consists of upland habitat.
2. Northwest Dump Road Subarea (IR01)
This subarea includes part of the IR01 Undeveloped Area northwest of Dump Road and east of IR06.
This subarea was used historically as a waste disposal area. It is predominantly upland habitat
with a small wetland habitat in the northern portion of the subarea.
3. West Subarea (IR01)
This subarea includes levee roads and small portions of active and inactive
dredge ponds that are southwest of IR24, IR06, and the RCRA/facility landfill. The subarea
also includes roads and portions of ponds that are near those described and still within the
IR01 Undeveloped Area. The inactive dredge ponds west of IR06 and IR24 were historically used
for waste disposal. The subarea is predominantly upland habitat.
4. South Dredge Pond Subarea (IR01)
This subarea includes former dredge ponds in the eastern portion
of the IR01 Undeveloped Area. Most of this subarea is currently wetland habitat with the exception
of the levees separating the former dredge ponds.
5. North Wetlands Subarea (IR01)
This subarea includes a large area of wetland habitat in the northern
section of the IR01 Undeveloped Area. Two sections of the wetland are submerged part of the year,
forming shallow ponds. Levees bisect the subarea and run along the northern boundary. This subarea
was formerly used for dredge disposal.
6. Fire-Fighting Training Subarea (IR01)
This subarea includes the fire-fighting training area and a
section of the IR01 Undeveloped Area in the northern portion of IA H1 and consists predominantly
of upland habitat as well as a small wetland habitat.
7. Landfill Area (IR01)
This site includes the fenced area of the RCRA/facility landfill and surrounding
areas of levee. The area consists of upland habitat.
8. Waste Disposal Sump/Lead Oxide Storage and Disposal Area (IR02 and IR16-B1/B2)
This area includes IR02, IR16 B1/B2, and the portion of IA H1 that is northeast of the RCRA/facility
landfill. The eastern portion of the area includes the waste oil sumps and a battery storage area.
The western portion of the area includes a dumping area adjacent to the landfill. These two IRs were
not divided into separate areas because there appears to be significant overlap in the two data sets.
Both wetlands and upland habitat exist within this area.
9. Sanitary Sewage Treatment Plant (SSTP)/Surface Impoundment Area (IR06)
This IR06 site includes former IWTP surface impoundments, sludge processing equipment and tanks, and
Building 871. A large part of this area consists of buildings, unpaved roads, and the remnants of
waste treatment facilities. The remaining area is upland habitat.
10. Solid Waste Disposal/Lead Oxide Storage Area (IR16-B3/B5)
This area includes IR16 B3/B5 and an additional portion of IA H1 northwest of IR16 B3/B5. The
additional portion of IA H1 was included in this area to encompass investigations related to the
IR16 B3/B5 site. This area is predominantly upland habitat with a small wetland habitat in the
northwest portion of the area.
11. Industrial Wastewater Treatment Plant Area (IR24)
This site includes the former Industrial Wastewater Treatment Facility (IWTP) area, the location
of the removed digester tanks, the IWTP overflow pond, and the adjacent upland habitat to the northwest.
This area is predominantly upland habitat with a small wetland habitat.
12. IR05 Area
This area is the former ordnance disposal and burning area on the south side of Mare Island. IR05 occupies
a small portion (approximately 59 acres) of the former Concord Annex, which is located along the southern
shore of Mare Island. Between 1947 and 1975, IR05 was used for munitions handling and storage by Naval Weapons
Station, Concord (WPNSTA Concord) and then by Mare Island. IR05 is located adjacent to Carquinez Strait,
south of Tyler Road, between Dredge Pond 7, a tidal wetland to the west, and a mud flat to the east. A
chain-link fence immediately south of Tyler Road controls access to the site.
13. Western Magazine Area
TThe Western Magazine Area (WMA) comprises 137 acres and approximately one-half of the site consists of 22
magazines (A147 through A-152, A-155, A-166, A-170, A-172 through A-175, and A-178 through A-186) and a
former equine stable and saddle club.