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i <br /> Ms Margaret Lagono <br /> Page 5 of 6 <br /> ' VAPOR EXTRACTION SYSTEM ACTIVITIES <br /> ' VES Operation <br /> The soil vapor extraction system was shut down intentionally during the first quarter of 2000 <br /> ' pending the results of confirmation borings and direction from PHS/EHD regarding further <br /> operation of the system <br /> ' Vapor Sample Analytical Results <br /> No vapor samples were collected during the fourth quarter of 2000 <br /> RECOMMENDATIONS <br /> ' Evaluate Current Conditions <br /> ' As proposed in our Workplan (09117/99) and the addenda thereto (6127100, 9111100) we <br /> recommend drilling soil borings to evaluate the effect vapor extraction has had on residual soil <br /> . contamination, and to further define the vertical limits of contamination The amended workplan <br /> ' was approved by PHS/EHD on October 31, 2000 Drilling is scheduled to occur within the next <br /> month Pending completion of this work, we recommend the following <br /> tVES Operation <br /> ' System operation was suspended on January 3, 2000 We recommend leaving the thermox <br /> system on standby until the results of the confirmation soil borings have been evaluated <br /> ' Quarterly Groundwater Monitoring and Sampling <br /> We will perform groundwater monitoring and sampling for the first quarter in February 2001 <br /> 1 Prior to conducting the fieldwork and based upon the results of the confirmation borings we may <br /> recommend a reduction in the sampling frequency and/or analytical suite for some wells <br /> i <br /> i <br /> ' roek4nr4QM2000 <br />