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�Cvv0 <br /> T( <br /> A S S 0 C I A 7 E S I N C <br /> equipment and treatment compound, and operation and maintenance of the system The <br /> cost of this alternative is estimated to be between$120,000 and $180,000 <br /> ♦ Criterion 5 <br /> This alternative should effectively remediate subsurface contaminants to acceptable <br />' regulatory levels within 18 months of implementation <br /> ♦ Criterion 6 <br /> The long term effectiveness would be good depending upon the degree of contaminant <br /> removal Groundwater would be monitored periodically until soil and groundwater is <br /> remediated to ensure that petroleum hydrocarbons are biodegrading <br /> I <br /> ♦ Criterion 7 <br /> ' This alternative has some minor implementability problems due to the necessity of a pilot <br /> test and the time involved in obtaining permits from the San Joaquin Valley Air Pollution <br /> Control District (APCD) for the vapor extraction system Permitting could take as much as <br /> I180 days depending upon APCD work load,but is typically completed 1n 60 to 90 days <br /> ♦ Critei ion 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 /> ' 9.0 RECOMMENDATIONS <br /> Based on the soil and groundwater data compiled and included in this technical report, ATC <br /> Associates recommends passive remediation of the petroleum hydrocarbons beneath the site <br /> ATC Associates recommends performing quarterly monitoring events and analyzing <br /> groundwater samples for geophysical parameters in addition to the existing monitoring <br /> parameters The geophysical parameters should include dissolved oxygen, carbon dioxide, <br /> ' sulfate, alkalinity, ferrous iron, nitrate, and oxidation reduction potential Once four quarters of <br /> monitoring at the site indicate that natural biodegradation is occurring, ATC will recommend site <br /> closure from the appropriate regulatory agencies <br /> ' Upon regulatory concurrence of the preferred remedial action method, ATC Associates will <br /> begin analyzing groundwater samples collected during quarterly monitoring events for <br /> geophysical parameters <br /> w 1130991reportslsumwe11 doc 13 <br /> 1 <br />