ARCHIVED REPORTS_XR0006880- CASE 2

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' Total petroleum hydrocarbons as diesel(TPH-d)was detected at concentrations up to 6,600 ppb from four of five grab ground water samples analyzed from the western property boundary The subject ' property has no documented use of TPH-d Hydrocarbon-impacted water associated with the West UST was limited to vicinity of the former ' tank location,while diesel-impacted water was documented along the western edge of the property boundary ' On 01 December and 05 December 1997 a total of ten soil probe boring (P15 to P25) were established surrounding the East UST area Locations of the soil probe bonngs are illustrated on Figure 2 TPH-g,BTE&X were detected ins it samples collected from the probe boring advanced in the area ' of the East UST area at concentrations as high as 2,100 ppm and 14 ppm (xylene), respectively Hydrocarbon-impacted soil associated with the East UST area appeared to be limited to the former dispenser area(southern edge of Lindsay Street)and to a depth of sixteen to seventeen feet in depth, ' in the saturated soil below ground water TPH-g was detected in six of eleven grab ground water samples collected from the East UST area ' at concentrations ranging from 53 to 100,000 ppb BTE&X were detected in eight of eleven samples analyzed at concentrations ranging from 0 55 to 1,700 ppb • January 1998 - Installation of Ground Water Monitoring Wells ' In January 1998, four ground water monitoring wells were installed near the West UST area to quantify the hydrocarbon concentration in ground water and determine the direction of ground water flow Results of the well installation and subsequent sampling delineated the dissolved hydrocarbons ' and indicated direction of ground water flow generally towards the northeast Ground water monitoring enabled delineation of the dissolved hydrocarbon plume,with concern for the possible migration of the plume away from the West UST Locations of the monitoringwells are illustrated on Figure 2 �' 1