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Mr. Maurice Benson <br /> May 1, 2003 <br /> Page 3 <br /> year to achieve remedial action cleanup levels is closer to 2033 rather than <br /> 2014. Please discuss in the report how the additional 19 years of operation <br /> and maintenance will increase the remedy's originally planned costs. <br /> Additionally, please discuss in the report how the extended cleanup time will <br /> affect the existing RAOs, and if there is a need to modify the RAOs or the <br /> remedy to account for the unplanned operation and maintenance of the <br /> treatment systems for an additional period of 19 years. <br /> Specific Comments: <br /> 1.) Page 4-1, section 4.1.1.1, first sentence; Please identify in the report the third <br /> action taken in 1987 besides the two non-time critical removal actions taken <br /> in the North/South Balloons in the same year. <br /> 2.) Page 4-3, section 4.1.2.2, third sentence; Please correct the formatting issue <br /> with the break between the paragraphs in the report. <br /> 3.) Page 4-3, section 4.1.2.3, second sentence; The sentence states that <br /> discharge to the percolation ponds negatively affected plume capture in the <br /> CA. Please discuss in the report how the planned installation of the <br /> percolation pond in the North Balloon (NB) will affect plume capture. <br /> 4.) Page 4-8, section 4.1.2.11; Please discuss in the report the benefits, <br /> applicability, and costs associated with implementing a phased aggressive <br /> pump-and-treat approach in both the CA and NB. The aggressive pump-and- <br /> treat approach has been proposed as an option several times in various <br /> ground water reports by DLA/DDJC, but never adequately addressed the <br /> regulatory teams past comments regarding implementation of such a system. <br /> 5.) Page 4-31, section 4.4.7; Please indicate in the five-year review when the first <br /> report containing the annual inspection forms for the South Balloon's <br /> institutional control sites will be released to the regulatory agencies. <br /> 6.) Page 6-2, section 6.2.4; Please specify in the report the number of people <br /> that comprise the "community contacts mailing list" and "all the addresses <br /> surrounding the depot." <br /> 7.) Page 6-2, section 6.2.6; In the report, please specify whether the next <br /> Community Update Forum will occur before the end of the five-year review <br /> period which ends in August 2003, so the community members may have an <br /> opportunity to comment on the review process. <br /> 8.) Pages 7-4, 7-5, 7-6; MWs 417B, 418C, 437B/C, 4438, 445B/C, 437B/C, <br /> 5088, 511C, 517B, 521B and 522C are showing significant increasing TCE <br /> trends. With so many monitoring wells showing increasing trends, please <br /> state in the report whether the remedy is still protective of human health and <br />