The Navy will present options on possible ways to clean up 60 acres at Alameda Point slated for a regional park on Thursday night. The draft cleanup options for Site 32 represent the culmination of 25 years of groundwater and soil studies that began before base closure was announced. Only five acres have been flagged for cleanup, but uncertainty about what lies beneath the pavement and structures requires a conservative approach.
The site lies in the northwest portion of the old airfield along the Oakland Estuary and features open grassland, seasonal wetlands, runway, a large concrete bunker and two buildings. Input from the community and regulatory agencies on the cleanup plan will have a major impact on the design and use of the future park.Continue reading “Navy presents parkland cleanup plans”
The City of Alameda became the new owner of the Seaplane Lagoon at Alameda Point on April 13, 2016. It came from the Navy with a new condition that exceeds normal protocols for dredging in San Francisco Bay.
As with all cleanup sites, the Navy, city and regulators agreed to what areas needed to be cleaned up in the Seaplane Lagoon. The cleanup plan approved in 2006 was based on testing the sediment throughout the 110-acre lagoon. The problem areas were confined to about 10 acres at the northeast and northwest corners of the lagoon where storm sewers dumped contaminants prior to 1970s environmental laws. The agreed upon plan said that there would be no restrictions on the lagoon when cleanup was done.
After cleanup was completed, two years of discussions between the Navy, state and federal regulators, and the city led to an amendment to the official cleanup decision to include a detailed management plan for any future dredging in the Seaplane Lagoon. The city led the effort to create a sediment management plan. It stipulates that all dredge sediment brought to the surface will have to be spread out six inches thick on a drying pad and scanned for radium-226 radiation at a cost borne by the city.Continue reading “Radium safety enhanced at Seaplane Lagoon”
Navy environmental cleanup operations at Alameda Point ran the gamut during the summer and fall of 2014.
Operations included using bacteria to clean up groundwater, grinding radium out of a building floor, digging up lead-contaminated soil, constructing a metal shoreline waste barrier, digging up shoreline waste, preparing to install a 30-acre soil cover, constructing a new shoreline wetland, checking drain lines for contamination with cameras, and demolishing a several-acre temporary concrete drying pad near the old Control Tower.
The Navy began embedding a steel barrier along several hundred feet of the western shoreline of Alameda Point during the week of August 18. The purpose of the barrier is to contain contaminated ash and burn waste material that was bulldozed into the Bay some 60 years ago and is now overlain with silt. The area is where the Navy burned various waste materials.
The containment system is called a waste isolation barrier. It consists of 35-foot-long interlocking steel pilings that are hammered into the ground with a hydraulic vibrator suspended from a crane cable. Perpendicular steel walls behind the barrier add stability. The final elevation of the top of the waste isolation barrier will be approximately 10 feet above mean sea level.
Tests around the area were conducted in 2010, 2011, and 2012 to determine if any of the chemicals in the burn residue were entering San Francisco Bay. None were found to be entering the Bay. Nevertheless, the Burn Area’s proximity to the Bay requires that the contaminated waste either be removed or permanently isolated. Removing all of the waste from under the shoreline would have cost $40 million. The containment system costs $13 million.
The construction of the shoreline waste barrier is part of a larger Navy cleanup project on the adjacent 37 acres, called Site 1, which was once used as an underground waste disposal area. Much of the area is now covered by runway pavement that will remain in place. The entire 37 acres right up to the steel barrier will be covered with three feet of clean soil and seeded with native vegetation. A small wetland area will also be created along the shoreline.
When completed early next year, the area will be suitable for passive recreational use, including the Bay Trail.
The work can be observed from the Oakland side of the estuary at Middle Harbor Shoreline Park right next to the cranes.
The Seaplane Lagoon’s north side will be looking like its old self in a few months. The Navy has begun dismantling the waterproof concrete-walled containment system that was used for three years for dewatering and testing of soil dredged from the Seaplane Lagoon, marking a major cleanup milestone. Prior to that dredging work, much of the lagoon’s north frontage served as a staging area for replacement of storm drain lines contaminated with radium-226.
Construction of a new and improved soil cover over a waste disposal site concluded this spring, marking another milestone. The 110-acre site on the southwest corner of Alameda Point took 10 years of haggling about potential environmental impacts before a cleanup plan was adopted in 2010. Work began in early 2013. The dome-shaped soil cover required 500,000 cubic yards of barged-in soil to complete.
At the far northwestern corner of the Point, work is about to begin on another long studied and analyzed waste disposal site. In a few months, the Navy will be installing an interlocking steel retaining wall along 200 yards of the Bay shoreline to contain contaminated burned waste material that was bulldozed into the Bay more than a half century ago. Water dye tests showed no toxics are leaching into the Bay, but members of the Restoration Advisory Board (RAB) questioned whether the barrier would withstand a catastrophic earthquake. Partially covered by runway pavement, the entire 30-acre site will receive a three-foot soil cover. The work is expected to be completed in 2015. The area will be available for passive recreational use such as hiking trails when the city receives the land.
One of the longest-running and most problematic cleanup sites is at the old Naval Air Rework Facility (NARF), also known as Building 5, covering nearly one million square feet. Radium paint used for aircraft dial painting, and chemicals associated with engine repair work led to contamination that is still being remediated. The entire floor area will be scanned again for radiation in 2015, following up on at least three prior scanning surveys of walls, ceilings, pipes, and ducts. The year 2015 will also see the Navy returning to the site for a final round of groundwater cleanup treatments targeting contamination remaining after an intensive cleanup effort a decade ago.
Next door to the Bladium Sports Club on West Tower Avenue, another previously treated groundwater cleanup site will be treated again. Workers have already begun boring holes in the pavement for a network of hoses that will be used for introducing contaminant-eating bacteria into groundwater along with a bacteria food source.
On Saturday, July 12, the Navy’s annual cleanup site tour visited four of the cleanup areas. The most impressive stop was the 110-acre landfill site mentioned above. For the first time in over 15 years, members of the public were allowed to walk around and enjoy the magnificent views from the embankment that is closer to San Francisco than to city hall. The fencing is all gone, and with it the radiological warning signs. The Navy replaced an aging metal culvert that connects the site’s North Pond to San Francisco Bay with a concrete culvert.
Tour participants were able to see the area’s expanded wetland with a new tiny island. Caspian Terns started nesting on the island a few months ago, another type of milestone. “The last time Caspian Terns were seen in that area nesting was in 1999 when only one nest was detected,” said Alameda wildlife biologist and Alameda Point bird surveyor Leora Feeney. The 79-acre soil cover on the landfill will be seeded with flowering native grasses later this year. The vegetation mix was chosen by the RAB.
According to the Navy’s environmental cleanup coordinator, Derek Robinson, $513 million has been appropriated to date for Alameda Point cleanup, although some of it remains to be spent on upcoming work. His office, the Base Realignment and Closure Program, estimates another $80 million will be needed by the time remaining projects and follow-up monitoring are completed.
Later this year, the Navy is expected to transfer to the city the 33-acre North Housing site and seven-acre former Island High School site that sit next to Alameda Landing and Estuary Park, marking another milestone on the long and winding cleanup road to civilian use.
Update notes: Subsequent criticism of the Navy as to the necessity of a security fence by members of the public and regulatory agencies led to the removal of the security fence from the final work plan design. The Navy also agreed to shorten the soil gas vents to two feet, since only trace amounts of methane gas are now emitted from the landfill waste, most of which is industrial and did not produce methane in the first place. Additionally, the Navy agreed to examine the aging metal culvert that connects the North Pond of the West Wetland to San Francisco Bay. The culvert provides the water lifeline for the North Pond habitat and was at risk of collapse and being stopped up with debris. The Navy replaced the metal culvert with a concrete culvert (see photo above) and debris screen.
Thirty-five years after the Navy stopped disposing of toxic waste in unlined pits next to San Francisco Bay on Alameda Point’s southwest shoreline, the final actions to comply with state and federal laws are finally being implemented this year.
Decades of wrangling between the Navy and regulatory agencies over how to handle the West Beach Landfill, dubbed Site 2, were finally ironed out this spring. The U.S. Environmental Protection Agency (EPA), the Regional Water Quality Control Board (Water Board), and the California Department of Toxic Substances Control (DTSC) have agreed to a plan that calls for leaving the estimated 1.6 million tons of industrial waste in place and adding more soil to the existing soil cover.
The Navy began dumping waste in the area in 1952, four years before they surrounded the area with a seawall. The dump was closed in 1978, but early efforts to comply with state environmental laws for landfill closure were not to the satisfaction of the Water Board.
In its May 2012 draft engineering work plan for the landfill, the Navy cited a decade of groundwater monitoring along the shoreline that proved the toxic chemicals of concern are not migrating toward the Bay. Instead, the chemical concentrations are either stable or declining. The contents have been sitting in water-saturated subsurface soil since the disposal program began 60 years ago.
Radiological hotspots of debris and soil, including a small storage building, were removed after an earlier scan of Site 2. Before the current two feet of clean soil is put in place, the soil will again be scanned down to a depth of one foot, and elevated concentrations will be removed. Radium-226 paint waste was disposed of in the landfill.
One of the major concerns about leaving this landfill in place is the consequence of a major earthquake. The Navy responded to a comment from a DTSC engineer by acknowledging that in the event of a maximum credible earthquake, the riprap boulders forming the “seawall is conservatively assumed to be non-existent, instantaneously whisked away and replaced with a 25-foot vertical face of liquefiable sand subject to plastic flow without being constrained by a rigid shell (sea wall).” The Navy’s earthquake model predicts that the earthen embankment above the seawall at the perimeter of the landfill, composed of clay and not sand, will glide into the Bay and “will not be overtopped by the waters of San Francisco Bay and freeboard of about 5 feet above mean sea level will remain, and so the refuse will remain isolated.”
The Navy removed a perimeter security fence from their plans following objections from regulators and the public. “Navy’s design and [Superfund] requirements for this project do not preclude future use of the site for limited public access or passive recreational purposes,” said the Navy. Simple “Habitat Restoration Project” and “Stay on trail” signs were deemed adequate.
In an unusual move, the Navy offered the Restoration Advisory Board the opportunity to select the new vegetation that will anchor the 60 acres of clean soil. In the fall of 2013, the Navy will seed the new soil with 13 native grasses, most of them flowering. The Navy has permanently removed the 12-foot high embankment on the eastern, inland side of the landfill site, which will make the grassland visible from the mixed-use area.
The 30-acre wetland area on Site 2 was not contaminated, but will receive improvements to the quality of several acres. The culvert connecting the wetland to San Francisco Bay will be regularly inspected and permanently protected.
Cleanup activity at Alameda Point in 2012 started where it left off in 2011 — at the Seaplane Lagoon. The northwest corner of the lagoon was the site of the second and final phase of lagoon dredging, which targeted sediment that had been contaminated near storm drain outfalls. With dredging completed by spring, the sight of Americas Cup racing yachts arriving at their temporary dock in the lagoon seemed to be a harbinger of the approaching end of the Superfund era at the Point.
Just outside the Seaplane Lagoon, another dredging operation was started and finished at one of the maritime ship piers where the Cape Orlando had been docked. By November, the massive ship was back at dockside, hull lights glowing at night.
In one of the most complicated and contaminated areas to the east of the Seaplane Lagoon, cleanup work began at an area 30 feet below ground where a cleaning solvent used on aircraft parts had seeped into the groundwater. After driving a series of metal bars down to the contaminated area, the soil, groundwater, and solvent were heated to just below simmering by means of electricity. This turned the water and solvent into vapor, which was then vacuumed out into a filtering system through a series of pipes.
At the far end of Alameda Point on the northwest landfill, the Navy relied on chemicals, rather than heat, to do the cleanup on a small portion of the site. Dozens of hoses snaking around the site to the injection wells delivered an oxidizing mixture of neutralizing chemicals into a pocket of solvents. Without this remediation, the solvents had the potential to reach the Bay.
The year ends with a cloud of controversy over the Navy’s plan for leaving drain pipes under the old Naval Air Rework Facility — Building 5. Letters from both the Restoration Advisory Board (RAB) and the city call for the complete removal of any lines containing radium paint waste. The Navy ruled out a more costly alternative that would remove all the contaminated pipes. The city challenged this decision, in part, on the ground that the Navy’s cost estimates for a thorough job are inflated and have asked that they reconsider.
Also in Building 5, plans to remove above-ground radium contamination from floors, walls, and ceilings in the mezzanine area will get underway within weeks. This area is where aircraft dials and markers were painted with radium paint that provided visibility in the dark. A final scanning investigation to detect radium, using sophisticated equipment employed in the decommissioning of nuclear power plants, found dozens of pie-sized irregular areas where radium dust had embedded in the surfaces. This project will conclude two decades of scanning and radium removal efforts in Building 5 and other buildings. Around $50 million has already been spent replacing drain lines leading to the lagoon under the surrounding tarmac, and dredging the lagoon, due to the disposal of radium paint and other chemicals down storm drains.
2013 will see the long-awaited final soil cover installed on the waste disposal site called Site 2 on the southwest corner of the wildlife refuge. It will be the largest engineering project since the runways were expanded in the 1950s, with over 200,000 cubic yards of clean soil being barged in from Decker Island in the Sacramento River. It will be seeded with California native flowering grasses selected by the RAB. This is the controversial dump that led the US Fish & Wildlife Service to balk at accepting the land for a wildlife refuge ten years ago. Since then, this dump has seen numerous reviews and a new plan that the US Environmental Protection Agency, regional Water Board, and state Department of Toxic Substances Control will be signing off on shortly.
2013 will end with commencement of a similar soil covering operation on the nearby landfill on the northwest corner of Alameda Point called Site 1. Both landfill areas will be safe for open space recreational activities when completed, but will be limited to hiking trails rather than mowed playing fields in order to maintain soil-stabilizing vegetation.