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Mr. Scott Hooton <br /> July 15, 1996 <br /> Page 2 <br /> There are more reliable scientific bases and technical criteria that may be used for evaluating <br /> plume stability rather than the mass of hydrocarbons calculated from chemical contour maps. <br /> Based on our experience, monitoring of indicator parameters such as dissolved oxygen and <br /> the by-products of bioattenuation provides more reliable data in evaluating the stability of <br /> dissolved hydrocarbon plume. <br /> For the above reasons, we do not recommend using chemical contour maps to calculate the <br /> mass of petroleum hydrocarbons in the groundwater as a means of evaluating plume <br /> behavior or stability. <br /> Please call if you have questions or comments. <br /> Sincerely, <br /> ALISTO ENGINEERING GROUP <br /> Al Sevilla, P.E. <br /> Principal <br /> i Developing a Healthy Disrespect for Numbers, p. 49 <br /> A►LISTO ENGINEERING GROUP <br />