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Mr George Takemon Project OF90-002 04 <br /> March 8, 1996 <br /> Page 5 <br /> northeast EMCON prepared two hydrograph maps (see Figures 5 and 6) for wells <br /> MW-13 and MW-14 Based on the hydrograph maps, it appears that dissolved <br /> hydrocarbons have decreased with time Therefore, it is EMCON's opinion that the <br /> combination of natural biodegradation and air sparging has decreased dissolved <br /> hydrocarbon concentrations in the groundwater <br /> The remediation system was operational for an average of 78 percent and removed <br /> approximately 570 pounds of TPHG during the fourth quarter The cumulative mass of <br /> TPHG removed to date is approximately 3,008 pounds The concentrations of TPHG and <br /> benzene are decreasing, indicating that SVE has been effective in removing hydrocarbons <br /> from the soil <br /> In addition, EMCON recommends the addition of nutrients (phosphorus, nitrogen, and <br /> potassium) into impacted wells to facilitate nucrobial degradation of petroleum <br /> hydrocarbons <br /> WORK IN PROGRESS <br /> Monthly operation and maintenance of the remediation system will be temporarily <br /> discontinued With declining influent concentrations and increased microbial activity, <br /> EMCON will evaluate the effectiveness of intrinsic bioremediation Teichert will continue <br /> to perform quarterly groundwater monitoring The next sampling event is tentatively <br /> scheduled for the last week of February 1996 <br /> It is EMCON's understanding that Teichert will submit a workplan to abandon monitoring <br /> wells MW-1, MW-3, MW-4, and MW-5 Once the workplan is approved, Teichert will <br /> contract a licensed well driller to abandon the wells <br /> DOCUMENT DISTRIBUTION <br /> We recommend copies of this status report to be forwarded to the following <br /> Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> SAC\N 1PJ010F9010F900020 4FS-951dms 1 <br />