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JUL-02-99 15:26 From:URS GREINER SF 4153981904 T-834 P 05/07 Job-959 — Figure 2:Carboxylic and • 100 • dicarboxyilc acids derived from FOMOWs Oxidation of organic 140 contaminants in groundwater at 120 ♦ Tetrachlor0athene a site contaminated by t� f Trichloroethene chlorinated solvents, primarily --- 1,11•trlchioroethene,and ac petroleum hydrocarbons (polycyclic aromatic 5 w hydrocarbons,primarily derived a 40 from diesel fuel).The project 9 !0 was a joint venture by Goo- Cleanse international Inc., R.F. b 0 Weston Inc.and the U.S.Army v 30 Corps of Engineers. 25 _` Chlorhle Ian Carboxylic acid Concentration ° 20 Performance Stearic acid 1200 m /L < ,s Demonstration Lauric acid 310 mg/L Tetradecanoic acid Trace to Hexadecanoic acid Trace Octadecanoic acid Trace 5 a 3n47 41/17 5/1/97 5/1197 71197 performance demonstration of in- Sample Date situ chemical oxidation of DNAPL was conducted by a joint venture of CCL the Westinghouse Savannah Figure 3: Average groundwater analytical results for the Savannah River Corp.,and the U.S.Dept.of River Site.The duration of the six day performance demonstration is Energy at the Savannah River Site Indicated by the shaded Interval.Tatrachloroethere and in Aiken,S.C.An estimated 1,600 trichloroethene destruction averaged 94 percent after the metric tons of solvents,primarily performance demonstration. Chloride ion,which is an oxidation tetrachloroethene and product of chlorinated solvents, increased dramatically. Post- trichlomethene,were discharged Injection rebound occurred due to dissolution of DNAPL from between 1958 and 1985. adjacent areas not treated during the performance demonstration. The performance demonstration was conducted directly adjacent to interval of the aquifer.Post-injection Anniston Army Depot:The the source area,encompassing a sampling indicated destruction of Anniston Army Depot in Anniston, volume of about 1,800 m3 at a depth about 253 kg of DNAPL,equivalent Ala.,closed a former unlined of 43 m below grade, ni ani iquifer to a 94 percent reduction. industrial waste lagoon in 1978. composed of native interbedded Dissolved chloride,an oxidation Hazardous wastes disposed in the and clay-rich sand.Free-phase product of tetrachloroethene and lagoon included petroleum DNAPL was observed and average trichloroethene,provides an hydrocarbons and chlorinated groundwater concentrations of effective measure of chlorinated solvents.After closure,much of the tetrachloroethene and solvent DNAPL destruction in lagoon sludge was excavated and trichloroethene were 119.5 and 21.3 groundwater.Significant chloride the lagoon was backfilled with mg/L,respectively,with an increases were recorded in addition native clay. estimated 269 kg of DNAPL within to large reductions in contaminant Significant contamination the treatment area. concentrations in groundwater.See remained,estimated at 32 metric A six-day performance figure 3,this page.Costs for the in- tons of total volatile organic demonstration was completed in situ chemical oxidation compounds,primarily April 1997,during which about performance demonstration was trichloroethene in a volume of 16,000 L of 50 percent hydrogen $183,000 for reagents and the about 10,500 m3 of both_ peroxide plus catalyst solution were injection program,excluding unsaturated and saturated soils.The delivered via four high-pressure consultant oversight and pre-and maximum Mchloroethene injectors spanning the contaminated post-injection characterization. continues on page 10» Soil&Groundwater Cleanup August/September 1998 8 a