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Total petroleum hydrocarbons as diesel(TPH-d)was detected at concentrations up to 6,600 ppb from <br /> • four of five gi ab ground water samples analyzed fi om the western property boundary The subject <br /> ' property has no documented use of TPH-d <br /> Hydrocarbon-impacted water associated with the West UST was limited to vicinity of the former tank <br /> location, while diesel-impacted water was documented along the western edge of the property <br /> boundary <br /> ' On 01 December and 05 December 1997 a total of ten soil probe boring (P15 to P25) were <br /> established surrounding the East UST area Locations of the soil probe borings are illustrated on <br /> Figure 2 <br /> t TPH- BTE&X wei e detected in soil samples collected from the robe boring advanced in the area <br /> g� p p g <br /> ' of the East UST area at concenti ations as high as 2,100 ppm and 14 ppm (xylene), respectively <br /> Hydrocarbon-impacted soil associated with the East UST area appeared to be limited to the former <br /> dispenser area(southern edge of Lindsay Street) and to a depth of sixteen to seventeen feet in depth, <br /> ' in the saturated soil below ground water <br /> TPH-g was detected in six of eleven grab ground water samples collected from the East UST area <br /> ' at concentrations i anging from 53 to 100,000 ppb BTE&X were detected in eight of eleven samples <br /> analyzed at concentrations ranging from 0 55 to 1,700 ppb <br /> January 1998 _ Installation of Ground Water Monitoring Wells <br /> t In January 1998, four ground water monitoring wells were installed near the West UST area to <br /> quantify the hydrocai bon concentration in ground water and determine the do ection of ground water <br /> flow Results of the well installation and subsequent sampling delineated the dissolved hydrocarbons <br /> ' and indicated du ection of ground water flow generally towards the northeast Ground water <br /> monitoring enabled delineation of the dissolved hydrocarbon plume, with concern for the possible <br /> migiation of the plume away from the West UST <br /> Locations of the monitoring wells are illustrated on Figure 2 <br /> 1 <br />