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4707 Pacific Ave <br /> Page 2 <br /> Within the last quarterly status report, GeoStrategies included a summary of the <br /> observed vacuum and the estimated radius of influence was depicted on Figure 2. <br /> As you must be aware, Figure 2 included two vapor extraction wells, VW4. Please <br /> correct this figure as only one VW4 exists. The radius of influence depends on <br /> many factors relating to lateral and vertical permeability, the extent of soil <br /> heterogeneity and the construction of the vapor extraction wells. In the annual <br /> report, please provide a description of the field methodology used to estimate the <br /> radius of influence and how the radius of influence is affected by soil <br /> heterogeneity. You may wish to consider collecting soil samples for the purpose of <br /> evaluating the progress of site remediation when equipment is mobilized to install <br /> monitoring wells. <br /> Also, tables that summarize the operation of the vapor extraction system should <br /> clearly include information regarding the amount of time that the system is in <br /> operation during a reporting period. <br /> If you have any questions, please contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental <br /> �Health <br /> �Division �n <br /> Mary Meays, Senior REHS Margam Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> MM\4707PAC <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Greg Gurss, GeoStrategies <br />