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1 <br /> 14kTC <br /> A S S O C I A T E S I N C <br /> • Criterion S <br /> This alternative is estimated to effectively remediate subsurface contaminants to acceptable <br /> regulatory levels within 18 months of implementation <br /> • Criterion 6 <br /> ' The long term effectiveness for soil remediation would be good depending upon the degree of <br /> contaminant removal <br /> Criterion 7 <br /> This alternative has some minor implementabilrty problems due to the necessity of a pilot test <br /> and the tune involved to obtaining pernuts from the San Joaquin Valley Unified Air Pollution <br /> Control District (APCD) for the vapor extraction system Permitti ig could take as much as <br /> 180 days depending upon APCD work load, but is typically completed in 60 to 90 days <br /> ' • Criterion 8 <br /> Impact to the businesses during installation and other site activities will be moderate This <br /> method has been shown to be effective in similar soil types and regulatory acceptance is <br /> expected <br /> 7_3 Small Community Well Destruction and Replacement <br /> • Criterion I <br /> The small community well destruction and replacement alternative has no immediate health <br /> based risks The existing small community well would be pressure grouted with a <br /> concrete/bentomte slurry so the possibility for exposure to humans by volatilization, dust, or <br /> dermal contact with impacted sort is nunimal, with little or no fire or explosion hazard <br /> Criterion 2 <br /> This alternative would reduce the existing levels and volume of impacted soil over time by <br /> natural degradation and attenuation, but the rate of reduction is not known The possible <br /> ' nugratnon of petroleum hydrocarbons in soil caused by surface water flushing contaminants into <br /> the groundwater is mu imal due to the asphalt and concrete surface on site The groundwater <br /> gradient direction has been consistently southeast which makes it unlikely that if groundwater <br /> ' becomes impacted the plume will migrate off site in the short term <br /> • Criterion 3 <br /> This alternative would not immediately remediate soil to levels acceptable to regulatory <br /> agencies Natural degradation of residual hydrocarbons would occur over tune with no <br /> potential receptors located within a one-third mile of the site <br /> W W43041repoiU\c1oswe doc 9 <br />