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JUN 1 n 1989 �. Mr. Hal Miller June 8, 1989 Page 3 The final drilling activities, during October-November, involved installation of four sonstalled to Thesel vapor extraction wells. prevent subsurfacehydrocarbon extraction wells were ins vapors from impacting business operations and to provide for preliminary soil remediation. In late 1986, groundwater pumping was being conducted from PW-1 pW-3, MW-4, and MW-12. Pumping rates were low (.25 to .75 gallons per minute (gpm) per well) and groundwater level monitoring data did not show a large impact on the groundwater the pumping activities. However, pumping flow system by of over 5oo-gallons activities in MW-4 allowed for the recovery ears end, of free product from the subsurface in 1966. At the y plume's horizontal ext the dissolved hydrocarbon ent was undefined and extended off-site in the up and down gradient ail�ction:�. Results of domestic well sampling continued to indicate that the drinking water aquifer beneath the site had not been impacted. 1387 In February, two additional monitoring wells theeinstalledere off- dissolved site to further define the lateral extent of hydrocarbon plume. Monitoring well MW-13 was installed across tic wells 1927 and 7 Thornton Road near domes912. Monitoring well MW-14 was installed upgradient of the site to investigate the possibility of an upgradient off-site source. Results of groundwater sampling from these wells showed detectable levels of dissolved hydrocarbons. system was started Also in February, the soil vapor extraction ed hydrocarbon vapors through activated with treatment of remov action system oPeaterd continuously carbon. The vapor extr continued through the year. Through 1987, groundwater pumping GROUNDW-TER TECN\OLOGY,I\C.