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ArR-20-2000 THU 04.50 PM <br />RMC <br />Ms. Lori Potter <br />April 20, 2000 <br />Page 3 <br />FAX NO <br />ID:3036656959 A~20'00 <br />P, 10 <br />16.32 Na.010 P.04 <br />Inc <br />been impacted by releases from the West Pit. Well M-26 is located less than 500 feet further <br />downgradient from the West Pit than well M-11 R. BMRI oNers no data or analysis to support their use <br />of well M-26 as an "unaffected" well. Without this analysis, BMRI should not represent downgradient <br />alluvial well chemistry as "unaffected". <br />6. Sedio r~.2 pgge t;, first aaraeranh first sentence <br />See Comment No. t. The conclusion that the hydrologic model proposed in TR-026 is still applicable <br />must be substantiated. <br />?. Section 2.2 pa,~_7 fiat loll nar~-n / t t'i2fence <br />Without providing the estimated and observed travel time data and alculations, it can not be verified <br />that these are similar. <br />8. Section 23r ins r a"d & last tenfence of second oaru.~ h In this section <br />What 'geochemical reactions" other than the 'dissolution of secondary sulfate salts' discussed earlier <br />in Section 2.3, govern the distribution of water quality in the West Pitt <br />4. fiction 2.3. R3~8. first fr31(naraeinh <br />No water quality data for well PC-2 is provided in the report. Because PC-2 water quality is referenced <br />throughout TR-028, the document must provided these data. In the "conceptual geochemical model <br />presented in 7R-026," inflow to the West Pit derived from the Precambrian bedrock aquifer was <br />estimated to be less than 150 gpm, while inflow from the Rito Seco alluvial aquifer was estimated to <br />be about 60 gpm (see TR-026 5ettion 3. t,4). BMRI should provide analyses to demonstrate that these <br />estimates are consistent with the data generated during the initial phase of water treatment. Also, TR- <br />026 should discuss the potential impact of the Plnk Gneiss Pit groundwater quality on water quality <br />deteMed at PC-Z and the West Pit. <br />10. ~ecflon 2,3, p-+789. cantinuedparaaraph, second ful-sentence <br />Dilution could also explain some of the decrease in manganese concentrations observed at well M- <br />17 R. TR-029 should provide an analysis demonstrating that manganese is not conservative in the <br />alluvium. <br />T t. Secoon 3.0, tract 10, fief oanrraDh. fast sentence <br />A figureltable illustrating the relaz[ve contribution of the individual sources to the overall, long-term pit <br />chemistry would be most useful. Specifically, BMRI must present their geochemical model for the <br />posttlosure time period. <br />