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v <br /> Mr. William S. Johnson <br /> October 1, 1985 <br /> Page Three <br /> REMEDIAL ACTIONS- ALTERNATIVE I (continued) <br /> The unconfined groundwater table should be allowed to recharge during the <br /> upcoming rainy season. The recharging groundwater could then dislodge the <br /> soil-bound product from the soil's capillary or vadose zone. If or when <br /> } free product is detected in the monitoring wells, a sound decision can be <br /> made in the placement of a hydrocarbon recovery and groundwater restoration <br /> unit as described by Fox Environmental Services, Inc. in Appendix "A". It <br /> can only be "assumed" that a recovery system would be effective in extracting <br /> the product if it were installed at this time. <br /> REMEDIAL ACTIONS ALTERNATIVE II <br /> Through the weekly monitoring schedule, it has been determined that the free <br /> product detected in MW-8 has become soil-bound or suspended above the piezo- <br /> metric level of the groundwater in the capillary or vadose zone. Furthermore, <br /> i MW-8 is the only monitoring well which has detected free product throughout <br /> the course of this investigation. <br /> Therefore, an assumption can be made that the plume is concentrated near MW-8 <br /> and a hydrocarbon recovery and groundwater restoration unit as described in <br /> Appendix "A" can be installed in that vicinity. The groundwater would be <br /> depressed slightly to create a cone of influence and then be processed through <br /> the water treatment system described in Appendix "A". <br /> The groundwater restoration unit shall then discharge the effluent on site <br /> into a french drain type trench system as described in Appendix "B", The <br /> effluent shall then percolate through the soil to force the suspended product <br /> to the present groundwater level. The phased product can then transport to <br /> the recovery well for removal. <br /> Implementation of Alternative I shall begin immediately. If free product is <br /> detected during the weekly monitoring, in any of the groundwater monitoring <br /> wells, San Joaquin County Environmental Health District shall be notified of <br /> such. A permit shall then be secured to install a recovery well as proposed <br /> here. <br /> Sincerely, <br /> K, Williamson <br /> i <br /> ` rector - Environmental Affairs <br /> es 'Elder <br /> Elder Engineering, Inc. \ <br /> JKW/ca <br /> } <br /> cc: Ron Valinati r San Joaquin County Health District <br /> Thomas R, Pinkos - Central Valley Regional Water Quality Control Board <br /> Laurie LLCotull�ass- Scan Joaquin County Health Department <br /> Cr-or on.j,11ogg o Oliygom alleyhatianoolaWater Quality Control Board <br /> J. C. Chambers Y Conoco, Inc•, Houston g <br /> J. R. Fox - Fox Environmental Services, Inc. <br /> f <br />