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04/01/1588 <br /> M E M O R A N D U M <br /> TO: Laurie Cotulla <br /> FROM: David Carls <br /> SUBJECT: 909 W Hammer Lane - Exxon <br /> Following is a brief site history for the 909 W Hammer Lane Exxon <br /> Station. <br /> 1) (4) Single walled carbon steel tanks were installed in 1967 of the <br /> fallowing capacities and uses.- <br /> 1 ) <br /> ses:1 ) 8000 gal . U. L. <br /> 2) 8000 gal . regular <br /> 3) 8000 gal . premium leaded <br /> 4) 550 gal . waste oil <br /> ::) Product line leak in November 1985 (no estimate on amount ) - <br /> Static_n closed. Tanks removed, contaminated sails removed. <br /> -�'- <br /> 3) E. A. Engineering report (Vapor probe study conducted) indicates <br /> that the sails are clean to 20 feet . <br /> 4) S. T. I . installed 5 monitoring wells on site (all have showed some <br /> level of contamination at some time) recent water samples only show <br /> contamination in M. W. 3 and M. W. 4 located at the former tank <br /> excavation. <br /> 5) Groundwater is at 47 feet as of February 1988 though water level <br /> has been as high as 52 feet . <br /> 6) Groundwater Gradient is to the Northeast <br /> 7) E. A. latest report (dated 3/23,188 suggests that since latest round <br /> of sampling shows a dramatic drop-off in levels of contamination in <br /> all the monitoring wells, the site be considered clean and no <br /> future site work: will be necessary. Latest sampling still shows <br /> benzene @ 300 ppb, toluene @ 270 ppb, ethyl benzene @ 13 ppb xylene <br /> @ 260 ppb and TPH @ 2. 1 . ppb in M. W. 1 . M. W. 4 still shows slight <br /> contamination (0. 2ppb TPH) as of the February 88 sampling. <br /> Conclusion: Further sampling should be required since the State Action <br /> level for benzene and toluene is still being exceeded and plume is not <br /> yet defined. <br />