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DDRV-Tracy OU #1 Chemicals of Concern <br /> Chemical of Concern Minimum Frequency Remedial Decision Rationale <br /> Detection Detected <br /> Concentration Versus <br /> Versus Frequency <br /> Maximum Ag/L Analyzed <br /> Carbon Tetrachloride No on-Base source identified. Off-Base <br /> trace/6.8 4/190 source a possibility. Decision to set <br /> aquifer cleanup standard will be addressed <br /> in Comprehensive RI/FS ROD. <br /> 1,2-Dichloroethene 3/83 Aquifer Cleanup level of 6 gq/t (California <br /> MCL) is established in this ROD. <br /> Chloroform 2/43 5/210 <br /> Dieldrin 0.02/0.4 12/200 <br /> simazine 0.5/2.07 19/190 <br /> Tetrachloroethene 0.5/411 6/190 <br /> Trichloroethene 0.5/560 Aquifer Cleanup level of 5 ASA (federal <br /> MCL) is established in this ROD. <br /> Arsenic 3/25 Aquifer Cleanup level of 5 Ng/L (federal <br /> MCL) is established in this ROD. <br /> Barium 6/188 <br /> Boron 100/1800 <br /> Chromium 20/190 <br /> Lead 10/140 <br /> Manganese 50/880 <br /> Mercury 1/3.3 <br /> Nickel 30/340 <br /> Nitrate 90/18800 <br /> Vanadium 4/28.9 <br /> 25. Section 4.1.2 <br /> The text in this section indicates that the present IRM may direct treated <br /> groundwater into the storm water holding pond, which on occasion can overflow to <br /> an off-Base irrigation system. However, this is not one of the disposal mechanisms <br /> included in the selection of the CERCLA remedy. <br /> Corrective Action: Delete the text which reflects that the disposal to the storm water <br /> holding pond is an option. <br /> EPA/R9 June 7, 1993 7/40 <br />