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operation of extraction wells located to the north and northeast <br /> of the investigation area. <br /> 6. 0 Conclusions <br /> Based on the analytical data, petroleum hydrocarbon compounds <br /> exist within the soils and shallow groundwater at the site in <br /> excess of typical cleanup levels. These levels indicate that <br /> considertion of site remediation is warranted. <br /> 7 .0 Remedial Alternatives <br /> Site remediation can be accomplished through the implementation <br /> of several different methods. Several viable alternative <br /> remediations methods were examined by WESTON for implementation <br /> at the Simplot site. These methods can be grouped into two <br /> types: 1) In-situ remediations and 2) Non in-situ remediations. <br /> In-situ remediation are those which can be accomplished by <br /> treating contaminated soils in place. Non in-situ remediations <br /> require soil and groundwater removal prior to treatment and <br /> disposal. In addition to the two categories of remedial actions <br /> examined, a no action alternative was also examined. Each of the <br /> remedial actions reviewed is presented in Table 4 . 'These actions <br /> were reviewed for feasibility of implementation based on known <br /> site conditions. Those remedial actions which appear to be <br /> feasible for implementation at the Simplot site are summarized in <br /> the following sections_ The summary also includes estimated <br /> costs for implementation. These costs are rough estimates to <br /> provide a range from which an evaluations of the feasible alter- <br /> natives may be made. <br /> 7. 1 In-situ Remedial Alternatives <br /> 7 . 1. 1 In-situ Volatilization ISV <br /> Petroleum products are complex mixtures which contain hundreds of <br /> distinct hydrocarbons. The varying composition of these products <br /> results in differing chemical and physical properties that make <br /> some products more amenable than others to removal by in-situ <br /> volatilization. Generally, compounds with higher vapor pressure <br /> and lower solubility in water are more efficiently removed or <br /> stripped. Hydrocarbon compounds in the unsaturated zone can <br /> volatilize and diffuse both to groundwater and to the surface as <br /> well as be directly transported to the groundwater. Possible <br /> transport mechanisms include 1) volatilization of unsaturated <br /> zone pore fluids to vapor and diffusion to the surface and 2) <br /> volatilization from the surface of soil particles and subsequent <br /> diffusion. <br /> The controlling mechanisms for vapor and chemical diffusion must <br /> be evaluated on a site specific basis. These factors fall into <br /> two categories, Soil and Chemical. <br /> - 10 - <br />