SITE INFORMATION AND CORRESPONDENCE_1993-2003

Home Browse Search

the harmful chemicals in carbon filters. This controls at Sharpe protect the public and the treatment technique was successful, and SVE environment by restricting the way land is used. In systems are no longer used at the depot. areas where soil is contaminated, any activities (such as construction and demolition) that could disturb soil Sharpe continues to monitor for the presence of are carefully reviewed and then limited to prevent contamination. In addition, Sharpe uses human exposure to the disturbed soils. Sharpe's "institutional land use controls" to make sure there Chief of Environmental Management is required to will be no disturbance to a few sites on the depot conduct an annual inspection of sites where where contamination remains in place. Land use institutional land use control is in place. Summary of the Five-Year Review Report The Five Year Review Report will take a close look at • The groundwater extraction and treatment systems the environmental concerns and the treatment at Sharpe are in place and operating, and they will systems at Sharpe. The cleanup actions that have continue operation until cleanup goals are met. been accomplished will be reviewed, and the report However, Sharpe now expects that it will take will evaluate how well the cleanup systems are longer than originally thought to achieve working. The purpose of the report is to confirm groundwater cleanup goals. Sharpe strives to whether the cleanup actions and systems in place at identify and use the best cleanup methods as new the depot are protective of human health and the technologies become available; the actual length of environment. The report will also recommend ways the cleanup will depend on the effectiveness of the to maintain that protection. methods that are used. • All planned soil excavations are now complete at The final version of the Five-Year Review Report is Sharpe. The regulatory agencies (U.S. EPA, DTSC, scheduled to be published later this year. Some and CVRWQCB) have approved leaving some soils review activities have already been completed. contaminated with metals (lead and chromium) in Although final conclusions will not be available until place at the depot. These soils are under the final report is published, the review activities to institutional land use controls to protect the public date report the following: and the environment. Land use is monitored by the Chief of Environmental Management. is Sharpe has succeeded in meeting the criteria for "construction completion." This means that Sharpe Schedule for the Five-Year Review Report: has completed the physical construction of all The Final DDJC-Sharpe Five-Year Review Report is cleanup actions; has addressed all immediate currently scheduled for publication in September hazards to the environment; and has brought all 2003. ■ long-term hazards under control. Sharpe will continue to look for ways to better control the movement of TCE and PCE in groundwater. The Five-Year Review Report provides details (about DDJC-Sharpe's environmental program. Table 4-1. Remedial Actions for DDJC-Sharpe You can review Operable Year _---__ the report at Unit Type of Action Started Nature of Action Status I Groundwater 1987 Groundw:tcrcxt� fotnndtreatment Operating the depot's Treatment m South Balloon A ca Q 1 Information Groundwater 1990 Groundwater extraction and treatment Operating - ` I 't rr Repository Treatment in North Balloon Area ycarN°• (see back Groundwater 1995 Groundwater extinction and treatment Operating ' O Treatment in Central Arca { page)- 2 Soil Removal 1994 Removal of and in Pesticide Mix Area Completed Ei{{ Soil Vapor 1998 Soil vapor extracma at Sites P-1 A, Completed j Extraction P-I B,P-IC P-1 E,and P4A Soil Removal 1998 Removal of soil at Sites Sd and 5-26 Completed Institutional Controls 2001 Land use controls at South Balloon Implememed Area south of South Crane Way DDIC Defense Diori irlion Depot San Joaquin Culifarnis 3