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' Report-Pilot Remedial System Test Page 27 <br /> Former Manna Pro Site <br />' Project No 207 3 <br /> • July 31,2000 <br />' 5 oxygen Changes in dissolved ox en levels have not yet been detected in MW-6 From <br /> g <br /> calculations made based upon the spread of groundwater contaminants it is expected <br /> that if changes in dissolved oxygen levels are to be noted from the presence of ORC, <br /> it will be in following monitoring events <br /> 8.2 Recommendations <br /> It appears that sufficient engineering data has been collected to proceed with a feasibility <br /> study as originally proposed in the original Work Plan As described in the Work Plan, <br /> the feasibility study should evaluate the following approaches <br /> Natural Attenuation <br /> This remedial method would depend upon natural bio-degradation and groundwater <br /> monitoring to eventually reduce contaminant levels to acceptable levels to achieve site <br />' closure The data collected during the installation of the soil borings as well as the pilot <br /> test should further help to determine if this is a viable remedial option <br />' Soil Vapor Extraction <br /> Vapor extraction as a stand-alone remedial method should be evaluated As discussed <br /> above, for this method to have any real possibility of being effective, it will be necessary <br />' for groundwater levels to drop significantly <br /> SVE with Groundwater Pumping <br /> This is the remedial method proposed by GTI and was the focus of their pilot testing as <br /> documented in the GTI report of 1994 Their data as well as information collected from <br /> more recent groundwater monitoring events will be evaluated <br /> SVE with Air Sparging <br /> The work documented in this report was intended to provide an adequate basis to evaluate <br /> the engineering feasibility of this method in comparison with the other three remedial <br /> methods described above <br />�i Once the Feasibility Study is completed, a Corrective Action Work Plan should be <br /> submitted which addresses the specific measures and protocols necessary to adequately <br /> mitigate the contamination at the site In the mean time, groundwater monitoring should <br /> continue at the site to obtain additional monitoring information regarding groundwater <br /> conditions <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone(209) 569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />