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II <br /> s <br /> 'F <br /> I� <br /> Ms. Linda Turkatte <br /> f December 21, 1995 <br /> Page 2 <br /> li <br /> i <br /> The macronutrients required by the microorganisms are carbon, nitrogen, and phosphorus. <br /> The optimum carbon to nitrogen to phosphorus (C:N:P) ratio is 100:10:1. Based on the <br /> latest monitoring data and certain assumptions (depth of impact is 20 feet;and porosity is <br /> 25 percent), the carbon content (from petroleum hydrocarbons) remaining in the aquifer is <br /> estimated to be less than 3 pounds. Thus, less than .1 pound of nitrogen and phosphorus <br /> will be required for complete metabolism of the hydrocarbons. <br /> ii <br /> In conclusion, the components of gasoline are known to be biodegradable, and, in fact, the <br /> I <br /> mere,soluble-co_mponents,,which-are the m_ost_toxic._and mobile, are the most biodegradable f <br /> fraction. Biodegradation of gasoline in situ is a proven and widely practiced method of <br /> treatment for this contaminant. EMCON's opinion is that the proper application of <br /> bioremediation techniques will result in cleanup of the site groundwater' to acceptable <br /> levels within a reasonable time frame, especially considering that the majority of the 4 <br /> contaminants have been removed. <br /> If you have questions, please do not hesitate to call. <br /> Sincerely, <br /> EMCON <br /> Jimmy Wong 'Matt Turner <br /> Project Engineer oject Manager i <br /> i <br /> cc: Mr. George Takemori, Teichert <br /> ii <br /> i <br /> c <br /> iI <br /> 0 <br /> SACN OF900020.4ES-9S%V:2 <br /> i! <br /> � h <br />