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Hull & Associates Inc. <br />Page 6 <br />in PRB-1 based on groundwater concentrations present, therefore, soil absorption correction is <br />moderate to low (IET has assumed the value to be 5%). <br />The Freundlich equation is an adsorption isotherm that relates the concentration of a solute on <br />the surface of an adsorbent to the concentration of the solute in a liquid. The Freundlich <br />equation is used to determine the theoretical mass of contamination adsorbed to the soil. The <br />mass of contaminant in the soil was determined using the soil adsorption correction (item 1). <br />The K constant is a figure relating the capacity of the adsorbent for an adsorbate and the 1/n <br />constant is a function of the strength of adsorption (American Water Works Association, Water <br />Quality and Treatment, 1999 ). The Freundlich equation is listed below: <br />qe=KCel/n <br />The theoretical values of K and 1/n are found in the following references: (Dobbs and Cohen, <br />1980/Faust and Aly, 1983). <br />MNA and Enhanced Attenuation (MNAJEA) <br />'"-�'. irM"�.� Cha.+u+� axanaot(nn: oycat axeni.utwr• tiyWy.:a <br />thfiury rmiwN +bb+Petld altl6lle /ulIY1W <br />WSW et.xaioat •.AtIW.._eYgntlalldn •Mwax'm� ��� <br />Cerk.ntnaM <br />DRu�://un. bsrtWr _ n4�artn� <br />J % C9f6em M1xi <br />! <br />Flur rodnatan a.e <br />/ <br />14 Raalfa� <br />k®tlq Mn.wP <br />FMit xtm aowta <br />�'rv�"'{Mkhl <br />aylaainti pYnMI <br />Mlnanl <br />RsYalcel e <br />•l%Q4alan <br />• edwcelan <br />PRB-B <br />PRB-B encompasses approximately an area of 10,048 square feet. This area will be treated with <br />a 25 foot vertical contaminated zone from 20-45 feet below ground surface (bgs). An injection <br />radius of 20 feet is proposed to treat the area. Based on the area to be treated and the injection <br />radius, 8 injection points would be required to treat the area with 5 injection intervals at 23-25, <br />28-30, 33-35, 38-40 and 43-45 feet bgs. Soil concentrations are assumed to be moderate to low <br />in PRB-2, based on groundwater concentrations present, therefore, soil absorption correction is <br />low to moderate to low (IET has assumed the value to be 5%). <br />