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Feasibility Study Report <br /> t1140 W Hammer Lane, Stockton, CA <br />' Criterion 9 Communay acceptance <br /> Since minimal activity would be conducted at the site, the impact on the community would be very <br />' minor and not disruptive to the businesses located on the site and nearby <br /> 7.4 Alternative 4—Natural Attenuation <br /> Criterion I Overall protection of human health and the environment <br /> IThe natural attenuation alternative has no immediate health based risks The impacted media exists at <br /> depths greater than 35 feet so the possibility for exposure to humans by volatilization, dust, or dermal <br /> contact with impacted soil is minimal, with little or no fire or explosion hazard This shallow aquifer is <br /> currently classified as a drinking water source but is not generally used as such <br /> Criterion 2 Compliance with,ARARs <br /> The natural attenuation approach has met ARARs at similar sites, but is generally evaluated on a case <br /> by case basis <br /> Criterion 3 Long-term effectiveness <br /> The long term effectiveness of thus alternative is ultimately good This alternative would reduce the <br /> toxicity and volume of the contaminants in the soil by natural biodegradation, but the rate of reduction <br /> is not known <br /> Criterion 4 Reduction of toxicity, mobility, or volume through treatment <br /> IThis alternative would reduce the existing levels and volume of impacted groundwater over time by <br /> natural degradation The rate of reduction is not known <br /> Criterion 5 Short-term effectiveness <br /> IThis alternative would not immediately remediate soil or groundwater to levels acceptable to <br /> regulatory agencies <br /> Criterion 6 Im lementabiht <br /> Of all the alternatives the passive remediation approach is the easiest to implement The required <br /> I p Pp p q <br /> G \DatMOROUNDMICNOWi.ES HAM\R1;i'ORTS\Fmmhdd}R�port dux. <br /> 17 <br />