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I <br /> . Mr Ron Rowe <br /> Page 4 of 5 <br /> • 1vME concentrations remain elevated in wells MW3, MW4 MTBE was detected in well MW4 <br /> for the twelfth consecutive quarter and in well MW3, located downgradient of MW4, for the tenth <br /> consecutive quarter <br /> Overall TPHg, BTEX and MTBE concentrations in the vicinity and downgradient of the former UST <br /> are within lower historical liiriits and generally stable <br /> Dissolved contaminants present in wells along the southern boundary of the site appear to be related in <br /> large part, if not entirely, to offsite releases <br /> VAPOR EXTRACTION SYSTEM ACTIVITIES <br /> VES Operation <br /> The soil vapor extraction system was shut down intentionally during the first quarter of 2000 pending <br /> direction from PHSIEHD regarding further operation of the system <br /> Vapor Sample Analytical Results <br /> No vapor samples were collected during the second quarter of 2000 <br /> RECOMMENDATIONS <br /> Develop Closure Criteria and Evaluate Current Conditions <br /> As proposed in our Workplan (09117199) and the addenda thereto (6127100, 9111100) we recommend <br /> drilling soil borings to evaluate the effect vapor extraction has had on residual soil contamination, and <br /> to further define the vertical limits of contamination Pending completion of those tasks, we <br /> recommend the following <br /> VES Operation <br /> System operation was suspended on January 3, 2000 <br /> Quarterly Groundwater Monitoring and Sampling <br /> We will perform groundwater monitoring and sampling for the fourth quarter in November 2000 <br /> Your office will be notified at least 48 hours prior to commencing field work <br /> • <br /> roeklgmr13QM2000 <br />