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Record of Decision System (RODS)

USN PHILA NAVAL SHIPYARD

Abstract

Site Name:  USN PHILA NAVAL SHIPYARD
Address:  BLDG 993 BROAD ST 
City & State:  PHILADELPHIA  PA  19112
County:  PHILADELPHIA
 
EPA ID:  PA4170022418
EPA Region:  03
 
NPL Status:  Not on the NPL
Non-NPL Status:  Removal Only Site (No Site Assessment Work Needed)
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/108
ROD Date:  12/30/1998
Operable Unit(s):  01
 
Abstract:  The Girard Point Management Area (GPMA) is a peninsula located in the northwest area of the Philadelphia Naval Base at the confluence of the Schuylkill and Delaware Rivers. This flat, vegetated 25-acre site includes two landfills- Installation Restoration Program (IR) Sites 4 and 5, a former transformer storage area (IR Site 3), a former Resource Conservation and Recovery Act storage facility, and the former Girard Point incinerator. The GPMA was historically used for the treatment, storage, and disposal of solid wastes generated at the Philadelphia Naval Base. Portions of the area were created by land filling associated with these waste management activities. Evidence of land filling activities is
supported by soil borings and test pit excavations which have confirmed the presence of construction debris, incinerator ash, suspected foundry slag/sand, blasting grit used for paint removal, and miscellaneous municipal waste as well as soil and fill materials (river dredge materials).

To accelerate cleanup of the GPMA the Girard Point Management Plan was developed in 1995 using the EPA directive "Presumptive Remedy for CERCLA Municipal Landfill Sites." One of the objectives of the presumptive remedy strategy is to shorten the Feasibility Study (FS) process by targeting remedial options considered during the screening of alternatives and detailed analysis. Treatment and/or removal of the landfill material were considered impractical due to the heterogeneity and volume of the landfill material, therefore the primary remedial components are source control and containment. According to the presumptive remedy strategy, landfills with a content of more than 100,000 cubic yards
would normally not be considered for excavation and removal. Landfill covers or caps address source control and containment under the presumptive remedy strategy.

The following early removal actions were implemented to focus investigations and remediation on the most critical areas of concern, and to facilitate source control and containment: bank stabilization along the shoreline of IR Sites 4 and 5, storm-water sewer engineering survey including line cleaning, underground storage tank removals and implementation of the presumptive remedy strategy.

The 1-95 Girard Point Bridge, spanning the Schuykill River, passes directly over and bisects the site. Two federally listed endangered species are known to inhabit the area at or near the GPMA. The peregrine falcons have nested on the I-95 Girard Point bridge and the shortnose sturgeon are known to inhabit the Delaware River near Philadelphia and are probably present at the mouth of the Schuykill River. The nearest civilian residential population, a section of south Philadelphia, is located approximately 1-1/2 mile to the northeast. Also located to the northeast are public golf park and a city park, Roosevelt Park. The park and golf course are located within 1/2 mile of the site.

The site was marshlands until it was covered with fill material between 1940 to 1970. The general land area surrounding the GPMA is densely populated within one mile to the northeast and heavily industrialized within one mile to the north with oil refining and petrochemical plants. The 100 year flood elevation line is 10 ft. above mean sea level (msl) referenced to the National Geodetic Vertical Datum of 1929. Elevations of the riverbank along the GPMA range from 15- 18 ft above msl along the southwest portion of the GPMA at IR Site 4 to 10-12 ft. msl along the south portion of the GPMA at IR Site 5. In 1994, wetlands were delineated at the Philadelphia Naval Base. Wetland locations were identified along the northwest corner of GPMA during a 1994 study.

Operable Unit (OU 1)
In order to evaluate the nature and extent of the constituents of Potential Concern (COPC) at the site and the risks posed to potential receptors, GPMA was divided into two zones: Zones A and B. Zone A, which is the landfill that contains municipal-type wastes, consists of IR Site 4 and IR Site 5. This zone covers an area of 11.2 acres and includes approximately 280,000 cubic yards of fill.

IR Site 4 comprises a landfill area of approximately 6 acres. Site history and aerial photography reviews indicate waste disposal activities occurred between 1940 and 1970. Construction of the Girard Point Incinerator (Building 668) at the eastern border of IR Site 4 in the early 1940s marked the beginning of waste management operations within GPMA.
 
Remedy:  The selected remedy for Zone A is Alternative 3. The remedy includes a of a permeable cover, which consists of a geotextile/permeable liner and a vegetated soil cover. The installation of the permeable cover will consist of the following activities: The existing storm-water sewer system will be upgraded. Catch basins and manholes will be cleaned and repaired as necessary. The inlet of catch basins will be raised to the ground surface. Enlargement of the inlet collecting surface area of the catch basins may also be required. Temporary sediment control
measurements around the catch basin will be installed to minimize sediment transport into the existing sewer system. Temporary staging areas will be constructed and vegetation, cover material (asphalt, concrete, etc.) and/or debris will be removed, as necessary for design. A geotextile/permeable liner will be placed over the existing soil. This liner will be covered by a minimum of 24 inches of soil suitable for supporting vegetation. The site will be graded and a vegetative cover (i.e., grass seeding and trees) will be added. Institutional controls will consist of placing legal notification of site conditions and limit on-site activities and minimize deterioration of site conditions. The institutional controls that will be implemented include the following: Groundwater withdrawn from wells shall not be used or made available for human consumption (Base-wide institutional control). GPMA shall not be used or developed for any permanent residential users (Base-wide institutional control). Any construction or development of an outdoor childcare playground will include the placement of 2 ft. of clean fill material, or other cover as approved by the State, between underlying soil and the surface of the childcare playground prior to commencement of any use of the outdoor area as a playground (Base-wide institutional control). Excavation shall not be accomplished without prior written approval of the State. In addition, a long-term shallow groundwater monitoring program will be implemented.

The liner will mark the location of the water, but not eliminate infiltration of water. The cover will consist of two feet of soil, which will be vegetated with native grasses and shrubs. This remedy prohibits exposure with the soil to protect human health and the environment. It also provides a vegetated buffer between the Schuylkill River (ant it's ecology) and the area adjacent to the Girard Point Management Area, which is proposed for heavy industrial reuse in the City of Philadelphia's Reuse Plan dated September 1994. The selected remedy for Zone B is Alternative 4. This remedy consists of paving the area returns, the area to its former use as a parking lot and prohibits exposure with the soil to
protect human health and the environment. The removal of soils and decontamination of the incinerator remove possible source areas and eliminate exposure to there areas.

Institutional controls, five-year reviews, and long term monitoring plans will ensure that the remedy will continue to be protective of human health and the environment. Based on current information, this alternative appears to provide the best balance of the nine evaluation criteria specified by the EPA.

Estimate Capital Cost: $2,278,000
Estimated Annual O&M Cost: $167,000 (first two years) and $117,000 (remaining 28 years)
Estimated Total O&M Cost: $3,610,000
Estimated Present Worth Cost: $4,429,000
 
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