SITE INFORMATION AND CORRESPONDENCE

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R Mr. Mike Hansen i -3- 18 September 1987 microorganisms tl at will support the biodegradation of th hydrocarbons, care must be taken in determiningthe rate of introduction to the system. 2- Have you :aconsidered the use of air sparging into the aquifer to provide the necessary oxygen? The system is designed with a series of injection and extraction wells that support the system. With the close proximity of the injection and extraction wells, air sparging may be an effective alternative to peroxide. 3- We agree with your use of computer model simulation to approximate the location of the injection/extraction system. It should be useful also in determining the rates of injection of the nutrient supply. R 4- It appears that your bacteriological studies indicate 'that the i digenous population should be adequate without the addition of bacteria. This should be monitored closely and enhanced if the need becomes apparen . 5- At what:' temperatures were your lab tests conducted:? Have you simulated seasonal field temperatures? If so, what were the results? 6- On page? 30, last paragraph, you state that "Solutions will be recovered through wells MW-19 and 26P.11s It shoull be 25P according to Table 6 and paragraph 2 on page 30. 7- New wells 22P, 23 , and 24P, scheduled to be monitor wells, shou d be drilled and completed as four inch wells as indicated so they may be converted to reinjection wells for control of the outer boundary of the plume. Table 5 shows that ' you planl1to redrill MW-17. MW-17 then could be used for the same purpose and effectively surround the site with a reinjection/containment system. 8- Tables 5sand 6 show three recovery wells, MW-19, MW-20, and 25P. T ese wells should be further apart to effecti ely cover the plume of contamination. 9- On page 34, paragraph 1, well 29P should be 28P (29P is part of post treatment program) . h _ l