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} <br /> Mitigation Work Platz <br /> Beacon Station #3-492, Manteca, California AGS86102-2P <br /> May 26, 1987 <br /> hydrocarbons. The use of a vapor venting system is particularly <br /> suitable for use in withdrawing volatile compounds in sandy <br /> soils. Our preliminary Plans call for installation of four wells <br /> completed within the vadose zone. All four wells will be <br /> completed such that they can be used as a"r inlet wells, Irapor <br /> recovery wells, or for subsurface air pressure monitoring. 'The <br /> wells will be installed within the tank cavity, on both sides of <br /> the repaired diesel storage tank, at the north and south ends of <br /> .. the cavity. The distribution of contaminants indicated by. <br /> Previous soil sampling s4ggests that contamination is <br /> connentrated In the southern part of the cavity, and that the <br /> northern two vadose wells will be most suitable for use as air <br /> .inlet or pressure -nozAtcring wells. Monitoring well MW-2 :will be <br /> t retrofitted for use as an air inlet well. <br /> vadose zone wells will be drilled to a total depth of <br /> approximately 14 feet below the ground surface. Hand augering <br /> equipment may be used for the borings. The augers will be steam- <br /> s <br /> cleaned prior to;use and between borings in order to minimize the <br /> --possibilityofidowr.-hole or cross hale contamination. Sail <br /> samples will be collected and described at thetime of drilling. <br /> The samples will be:C011ected at five-foot intervals from the <br /> - 5 <br />