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AILs <br /> C._! <br /> /.._. -.� A S S D C I A T E S I N C <br /> s}5 <br /> 1% <br /> ♦ Criterion 5: <br /> subsurface contaminants to acceptable regulatory <br /> This,alternative should effectively remediate <br /> levels within 18 months of implementation- <br /> Criterion 6: <br /> =j <br /> The long term effectiveness for soil remediation would be good depending upon the degree o <br /> contaminant removal. Groundwater would be monitored periodically until soil and <br /> groundwater is remediated to ensure that petroleum hydrocarbons are biodegrading. <br /> ♦ Criterion 7: <br /> >, This alternative has some minor implementability problems due to the necessity of a pilot test <br /> and the time involved in obtaining permits from the APCD for the vapor extraction system, <br /> permitting could take as much as 180 days depending upon APCD work load, but is typically <br /> 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 /> 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 groundwater <br /> samples for geophysical parameters in addition to the existing monitoring parameters. The <br /> geophysical parameters should include dissolved oxygen, carbon dioxide, sulfate, alkalinity, <br /> �. <br /> ferrous iron, nitrate, and Eh. <br /> - Upon regulatory concurrence of the preferred remedial action method, ATC Associates will begin <br /> analyzing groundwater samples collected during quarterly monitoring events £or geophysica <br /> parameters. <br /> z, <br /> Ieta <br /> w:195122keportslparcap.doc 13 <br />