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of treatment plant #2 were operating during the fourth quarter 1998. For clarity, please revise the Report to resolve this discrepancy. 6. Section 5.9.i.2, Pave 5 2. The Repe-t state- that f0m the AbOue Uppef ,Tile on Fimcjnxe 5.3 i do not sajgest captaxe of tile observed ±'T 2Q98." -airsairm is- _ -" _ _ _____ the __ 11ot ind±calte vqhY 7. Section 5.3.3.6, Page 5-3: The Report states that "DDJC-Tracy should consider shutting down EW003, EW004AU, and EW008A since the water pumped from these wells is diluting the water entering the stripper tower. . . It should be noted that dieldrin was detected in EW003 and EW004AU; however, carbon units are not installed at these wellheads to treat dieldrin." Appendix E shows that dieldrin has been detected at 0.107 ug/1, 0.100 ug/l, and 0.0985 ug/1 (ACL is 0.05 ug/1) at EW003 and at less than the method reporting limit and at 0.0695 ug/l at EW004AU. Since dieldrin continues to be detected above the ACL at EW003 and in the last sampling round at EW004AU, groundwater contaminated with dieldrin requires further treatment. Please revise the Report to address how dieldrin in groundwater at these wells will be treated should EW003 and EW004AU be shut down. One possible solution is to install carbon units at the wellheads to treat dieldrin and to route the treated water such that it bypasses the stripper tower to join the effluent from the stripper tower before discharge to the infiltration gallery or the chimney drain. 8. Table 5.3-2: The table shows that EW009B had a flow rate of 0 gallons per minute (gpm) and that EWO10AU had a flow rate of 22 gpm. However, Figure 5.3-7 shows influent concentration data for EW009B for 4Q98 and 2Q99. In addition, the figure does not show data for EWO10AU. It appears that the data for these two wells were switched. For clarity, please revise the Report to resolve this discrepancy. 9. Table 5.3-2: The table does not show data for EW040AU through EW044AU, although these wells are shown on Figure 5.3-7. For clarity, please revise the Report to resolve this discrepancy. 4