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1. Demolition Debris Subarea (IR01)
This subarea comprises a demolition debris disposal area north of the IWTP overflow pond and
consists of upland habitat.
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The Demolition Debris Subarea is an undeveloped area located within the north-central portion of IA
H1 that covers approximately 8 acres of upland habitat. The area is a historical demolition debris
disposal site north of the IWTP overflow pond where demolition debris was disposed of between 1959
and 1983. Records describing the exact type and volume of debris are not available but debris appears
to have been primarily construction waste (concrete, rebar, etc.).
This photograph taken in 1995 illustrates the Demolition Debris Subarea much as it exists
today (lighter mottled areas in the center of the photograph represent demolition debris fields).
The area remains undeveloped as illustrated by the photo below of exposed construction debris still
visible on the surface in 2003.
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.
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The Northwest Dump Road Subarea consists of predominantly upland habitat and covers approximately
14 acres within the central portion of IA H1. The subarea includes part of the IR01 Undeveloped
Area northwest of Dump Road and east of IR06. The site was historically used as a waste disposal
area and is predominantly upland habitat with a small drainage ditch along the northern portion.
Dump Road, which runs through the southern portion of the subarea, was built on fill consisting of
soil, construction debris, and large rock fragments and was historically sprayed with oil to control
dust. Most wastes generated by the Shipyard were trucked along Dump Road for ultimate disposal in
the landfill area. Approximately 1,160 linear feet of the Industrial Waste pipeline, which carried
liquid waste from the Shipyard for treatment at the Industrial Waste Treatment Plant, passes through
the area. Inert ordnance scrap (inert 20 mm cartridge cases) and other ordnance related debris was
identified within the area in 1995 during excavation of an 8-foot deep trench. Construction debris,
such as wood, glass, concrete, and asphalt is visible in the area. Free product has been observed in
several monitoring wells and soil borings within the area.
The photograph shows a 1995 aerial view of the Northwest Dump Road 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.
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The West Subarea covers approximately 10 acres along the west edge of IA H1 and includes levee
roads, the southern end of inactive Dredge Pond 1, portions of the eastern levee of Dredge Pond
2N adjoining the RCRA/facility landfill, and a central triangular shaped area between the two
ponds at the west end of Dump Road. The areas were filled during sporadic disposal activities
with waste similar to that disposed of in the historical disposal areas. The area contains both
wetland and upland habitat.
The photograph shows the West Subarea in 1995.
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.
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The South Dredge Ponds Subarea consists of approximately 66 acres along the southern boundary of
IA H1. Although many parts of IA H1 were used as a historical disposal site for Mare Island, there
is no evidence that the South Dredge Ponds Subarea was ever used as a disposal area. Most of the
area is wetland habitat with the exception of the levees separating the former dredge ponds.
Nontidal Wetland B and Wetland C make up approximately 90% of the area. Construction debris may
be present along portions of the eastern perimeter of the wetland areas.
The figure is a recent (1995) aerial photograph of the South Dredge Ponds Subarea.
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.
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The North Wetlands Subarea is located along the northern edge of IA H1 and covers approximate 45
acres of nontidal wetland habitat in the northern section of the IR01 Undeveloped Area. Two sections
of the area are submerged part of the year forming shallow ponds. Wetland A and Wetland D, dominated
by pickleweed, are located within the subarea and are separated by a dirt road running northwest to
southeast. The area was reclaimed from San Pablo Bay by the Navy during the early 1900's by using
dredge material to create the present wetlands. Levees subdivide the area and run along the northern
boundary. Although a large portion of IA H1 was used as a historical disposal site for Mare Island
waste, there is no evidence that the North Wetlands Subarea was ever used as a disposal area.
The photo shows the North Wetlands Subarea as it appeared in 1995.
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.
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The Fire-Fighting Training Subarea consists of approximately 6.5 acres located in the north-central
portion of IA H1. The subarea includes the fire-fighting training area and a section of the IR01
Undeveloped Area and consists predominantly of upland habitat as well as a small wetland habitat.
The site was established by the U.S. Navy in 1942 to conduct fire fighting training activities.
The remains of three of the four concrete storage tanks used to store fuel oil and fire suppression
foam in support of facility operations have never been located. Two other smaller underground storage
tanks associated with the facility have also never been located. The subarea is not considered to be
a waste disposal area since other areas within IA H1 were clearly identified as disposal areas during
the time the fire-fighting facility was being developed.
This photo shows a 1995 aerial view of the Fire-Fighting Training facility.
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.
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The RCRA/Facility Landfill Area covers 30 acres adjacent to Dredge Ponds 2N and 4N and is located approximately 1,700 feet from San Pablo Bay and 4,400 feet from Mare Island Strait. The site consists of upland habitat and includes the fenced RCRA/facility landfill and surrounding area of levee. The Landfill Area originated in the mid 1960's when levees were constructed to define a rectangular waste disposal area within the dredge spoils ponds. The original landfill (the "Facility Landfill") operated from 1965 until 1977. The Facility Landfill was extended southward in 1970 to its current size of approximately 30 acres. The landfill covered an area previously occupied by tidal flats that had been filled with dredge sediments from Shipyard operations in Mare Island Strait.
Although wastes disposed of in the landfill were not documented, they are assumed to include garbage, spent abrasives, scrap metal, shipboard waste, waste paint, solvents, acids, caustics, cleaning fluids, freon, corrosives, waste oil, grease, infectious wastes, lead-acid batteries, asbestos, construction debris, and mercury wastes. PCB contaminated transformer oil was sprayed on the roads at the disposal area to control dust until 1972. When the facility landfill reached capacity in 1978, a new landfill area (the "RCRA Landfill") was established on top of the western half of the facility landfill. The RCRA landfill accepted RCRA wastes from 1980 until 1989 when the facility was closed after the RCRA Part B permit application was denied by the State of California.
The figure below is a more current (1995) photograph of the site.
The photograph shows the landfill as it appeared in 1985 with the RCRA landfill to the left of the
structures; active disposal activities are visible along the western (left) edge of the landfill.
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.
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The Waste Disposal Sump/Lead Oxide Storage and Disposal Area consists of approximately 25 acres located northeast of the Landfill Area. The area includes the former waste oil disposal sumps (IR02), battery storage and disposal area (IR16 B1/B2), and a portion of IA H1 northeast of the RCRA/facility landfill. Both wetlands and upland habitat exist within the area. A former asbestos disposal site known as Wetland X is located between the oil sumps and the Landfill Area.
The first known oil sump was constructed just south of Dump Road in the early 1940's, followed by a series of sumps developed during the 1940's and 1950's that ranged in size up to 120,000 square feet. The types of waste oils disposed of in the unlined sumps are suspected to include petroleum waste oils, engine lubrication oils, hydraulic oil, and cutting oil. The oil sumps can be noted as the dark areas on the photograph on the right taken in 1954. The sumps were subsequently filled with soil in the late 1960's and early 1970's and the areas used for the indiscriminant disposal of solid wastes, including spent lead-acid batteries, sand blast abrasives, and asbestos material.
The oil sumps can be noted as the dark areas on the photograph on the right taken in 1954.
The photograph below shows waste oil infiltrating into a 2002 test excavation located in the oil sump
area along the boundary of the Wetland X disposal 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.
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The SSTP Area occupies approximately 8.5 acres in the west central portion of IA H1 and includes the former sanitary wastewater processing facility, the site of removed digester tanks, and overflow pond. The area is predominantly upland habitat with a small wetland habitat to the northwest. The facilities were constructed in 1957 as a Sanitary Sewer Treatment Plant (SSTP) and between 1972-76 a portion of the SSTP was converted into an Industrial Wastewater Treatment Plant that treated hazardous wastewater from the Shipyard through the early 1990's. Much of the facility structures and equipment have been removed during a series of demolition activities performed between 1990 and 2002.
The photograph below shows the facility as it existed in 1985.
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.
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The Solid Waste Disposal/Lead Oxide Storage and Disposal Area is located east of the Landfill Area and cover approximately 16 acres. The site includes two lead oxide sites (IR16 subsites B3 and B5) and the surrounding area that included two spur tracks and a rail line that extended south to the former Ammunition Depot. The rail lines were removed in 2002 as a precursor to remediation of the site. The area is predominantly upland habitat with a small wetland habitat in the northwest portion of the area.
Historical maps indicate that the site was used as a solid waste disposal area between 1942 and 1966. Subsites B3 and B5 were identified as battery disposal sites in 1985 although no historical information is available regarding the exact dates and locations of battery storage and disposal operations. The presence of staining and battery fragments along the rail lines suggest that the sites may have been used as transfer stations or storage areas for submarine and forklift batteries associated with Shipyard operations.
The photo shows the Solid Waste Disposal/Lead Oxide Storage and Disposal area in 1985.
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.
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The Industrial Wastewater Treatment Facility (IWTP)/ Surface Impoundment Area covers approximately 4 acres adjacent to the SSTP Area. The area includes the former IWTP surface impoundments, sludge processing equipment and tanks, and the Building 871 wastewater processing facility. A large part of the area consists of buildings, unpaved roads, and the remnants of waste treatment facilities; the remaining area is upland habitat. The IWTP and associated facilities have not been used since the installation closure in April 1996. The four surface impoundments were constructed in 1972 when the treatment facility was converted for the treatment of industrial and hazardous wastewater from the Shipyard. Originally unlined, the impoundments were upgraded with reinforced concrete and PVC liners in 1981-82. The impoundments were eventually removed from service in 1988 and covered with soil in 1989.
The photograph shows the four impoundments and associated treatment facilities behind them as they
appeared in 1985.
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.
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The site has three subareas: an upland subarea, a lowland subarea, and a tidal wetland subarea. Most of the upland subarea is unpaved. The exception is some asphalt-paved access roads and small asphalt-paved areas of varying condition. A series of nearly parallel dirt mounds are present in the upland subarea. There are 33 dirt mounds that range from approximately 40 to 180 feet long and 20 to 50 feet wide and average 5 feet in height. One former UST (IR05-2) was removed from the upland subarea, near the border of the lowland subarea. No buildings are currently present within IR05; however, one magazine (A-169) is within the IA I boundary immediately east of Tyler Road and IR05.
Only one operating utility system, a stormwater pipeline, is associated with the site. The stormwater pipeline drains the north half of the upland subarea and discharges into the tidal ditch that runs parallel to Tyler Road. However, all portions of the pipeline that were constructed of corrugated metal were removed during the OE removal action. A dredge pipeline, formerly used to transport dredge materials, traverses the northernmost portion of the site, discharging via an outfall in Dredge Pond 7. Two ponds in the lowland subarea are connected to Carquinez Strait by narrow inlets; the western pond is surrounded by an 8-foothigh soil berm. Dike 12, which is composed of wooden pilings, large rocks, and concrete riprap, runs along the shoreline of IR05. The tidal wetland subarea is located on the western side of IR05.
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.
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The magazines and adjacent roadways are in the area designated by the Onshore ERA as "upland" habitat. The remaining 50%of the site consists of wetlands located primarily between Ribeiro and Weyraugh Roads. A portion of this area has been referred to as inactive Dredge Ponds 8 and 9, which are currently functioning as wetland areas. As will be discussed, it is likely that these ponds were never operated as dredge ponds or were only operated very briefly as dredge ponds. The majority of the WMA is designated for reuse as open space, including the wetlands; however, a portion of the WMA near Magazine A-166 is designated for use as a portion of a regional park.
Eight of the magazines in the northeastern portion of the WMA are embedded into the hillside while 14 are constructed on fill material on the western portion of the WMA. The magazines are all constructed similarly: floors and walls are concrete; ceilings have a steel structure; and, no sumps or floor drains exist. A grid of concrete pilings supports each structure and creates a 3-foot-high subsurface crawl space. The crawl spaces constructed on fill material are easily accessible from all sides; those constructed in the hillside are not. Unpaved, bare soil surrounds the magazines. A system of roads provides access to the magazines.
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