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• • reinjection wells and percolation ponds. Soil—Studies have found the following It appears the SVE technique has This effort has met with only limited chemicals in the soil at Sharpe: successfully removed most of the success because the location of the TCE from site soils. Sharpe percolation ponds allows the reinjection • TCE continues to sample the soils to wells to absorb only about 10 percent of • TPH confirm that TCE is no longer a the total plant effluent volume. The • Lead and chromium (from past concern. location of the percolation ponds was painting and abrasive blasting changed from the original design to operations) Future Environmental Activities accommodate construction of a new warehouse. Soil Treatment. During the past ten DDJC's approach to future years, most of the contaminated soil at environmental remediation efforts is Most of the treated groundwater is Sharpe has been excavated, removed, two-fold. First, we continually work discharged to the South San Joaquin and disposed in a permitted hazardous to get the best results from existing County Irrigation District Canal that waste disposal facility. treatment systems and techniques. borders the east side of the depot. In For example, we recently installed a addition, some treated groundwater is new groundwater extraction well at supplied to the EI Paso Merchant Energy Present Environmental Activities each of our three groundwater Company for industrial reuse. In the Groundwater—The three groundwater treatment plants. These three new future, DDJC may designate more of the treatment systems continue to be extraction wells should allow us to treated groundwater for reuse. effective at removing chemicals from increase the amount of groundwater the groundwater beneath Sharpe we treat each year. This could Sharpe's three groundwater treatment systems through the use of the air stripping enable us to meet our cleanup goals are working to remove harmful chemicals technique. more quickly. from the environment. Rath Road Figure 3 shows where TCE was Second, we review innovative new a detected in groundwater beneath processes that potentially could be N � Jed Sharpe in late 2000. According to used at Sharpe. DDJC is currently our most recent studies, the TCE- reviewing whether it may be possible Figure 3 Si contaminated groundwater plumes to use a new technique that may be WE- 2000 have moved very little during the able to speed the removal of TCE i past twelve years. The TCE from groundwater. This new North Balloon ••'•• plumes in the groundwater zone process, called Dynamic Groundwater nr— �i - nearest to the ground surface Underground Stripping/Hydrous Treatment System ill (the Zone") appear to have Pyrolysis Oxidation, was developed •� A Sharpe I p II been pulled back from beyond at the Lawrence Livermore National the depot's western boundary. Laboratory. It uses steam to increase Central Area This means the treatment systems the rate of TCE vaporization. The :r Groundwater are successfully capturing much of costs and effectiveness of this new Groundimarerrreatmenr ithe TCE. In addition, contaminant process are being evaluated. ■ Flow po-eSystemrron System concentrations have decreased. �•ll k� ISI Monitoring Well ? aare However, TCE is still present in Are You Interested in Learning More? 7 • , e groundwater at concentrations If you would like to learn more about higher than the MCL. Using the environmental program at the New Reside4hal Ii current treatment techniques, we r yl.• Sharpe site, you can: Developme estimate it will take many years to reduce TCE in groundwater at • Contact Doug Imbed, DDJC f Sharpe to levels below the MCL. Office of Command Affairs, at �I I (209) 839-4009, or Soil—Currently, DDJC is using a Linda Janssen, California Dept. of technique called soil vapor of Toxic Substances Control r `J� extraction (SVE) to remove TCE Public Participation Specialist, at remaining in the soil. SVE (916) 255-6683 11 South Balloon a •• ,L applies a vacuum to vaporize • Join our Technical Review Groundwater TCE. This changes TCE from a Committee. Contact the Treatment ` numbers above for more details. 'j liquid into a gas. The TCE System' vapor, or gas, is then collected in • Visit our web site at: Laihrop Road _ - •`" ' carbon filters. www.ddc.dla-mil/ddjc-env