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Mr.James L.L. Barton <br /> February 18,2004 <br /> Page 2 of 3 <br /> RECOMMENDED ACTIONS AND TREATMENT SYSTEM MONITORING PROGRAM <br /> Ground Zero recommends the following modifications to the groundwater treatment system: <br /> 1. Install low-profile, multiple tray, air stripper, influent sump, and appurtenances in series lead treatment <br /> prior to the GAC units; <br /> 2. Remove the 4,800-gallon temporary storage tank and allow direct discharge to the ground surface <br /> pursuant to the existing WDRs; <br /> 3. Install additional groundwater extraction wells as necessary to increase the flow through the system. <br /> Based upon the expected increase in carbon efficiency Ground Zero proposes modify the monitoring <br /> program as follows: <br /> Influent Monitoring <br /> Constituent Fre uene Rationale <br /> TPH Gasoline Monthly Standard frequency for Order No. R5-2003-0044 <br /> BTEX Monthly Standard frequency for Order No. R5-2003-0044 <br /> MTBE, TBA, DIPE, ETBE, Monthly Standard frequency for Order No. R5-2003-0044 <br /> TAME <br /> Ethanol, Methanol Annually Has never been detected in any treatment system sample <br /> or from any monitoring well. <br /> 1,2-DCA, EDB Monthly Standard frequency for Order No. R5-2003-0044 <br /> Na thalene Monthly Standard frequency for Order No. R5-2003-0044 <br /> PAHs Annually Although detection limits are elevated, no carcinogenic <br /> PAHs have been detected in any influent sample. In <br /> addition, no carcinogenic PAHs have been detected in <br /> any effluent or GAC sample. <br /> Effluent Monitoring <br /> Constituent Frequency Rationale <br /> Flow Monthly Standard frequency for Order No. R5-2003-0044 <br /> Specific Conductivity Monthly Standard frequency for Order No. R5-2003-0044 <br /> H Monthly Standard frequency for Order No. R5-2003-0044 <br /> Total Dissolved Solids Annually Specific Conductivity is a measure of dissolved solids in <br /> groundwater and TDS levels have remained low and <br /> stable in all treatments stem samples <br /> TPH Gasoline Monthly Standard frequency for Order No. R5-2003-0044 <br /> BTEX Monthly Standard frequency for Order No. R5-2003-0044 <br /> MTBE, TBA, DIPE, ETBE, Monthly Standard frequency for Order No. R5-2003-0044 <br /> TAME <br /> Ethanol, Methanol Annually Has never been detected in any treatment system sample <br /> or from any monitorin well. <br /> 1,2-DCA, EDB Monthly Standard frequency for Order No. R5-2003-0044 <br /> Na thalene Monthly Standard frequency for Order No. R5-2003-0044 <br /> PAHs Annually No carcinogenic PAHs have been detected in any <br /> treatments stem sample. <br /> Chloride, sulfates, nitrates Eliminate Treatment system samples collected to date have <br /> remained low and stable and these constituents are not <br /> G:IGROUNDZE1TULEBURG\Reportslbarton_sysmod2.doe <br />