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1 <br /> ' Appendix A <br /> . Page 3 of 3 <br /> ' Total petroleum hydrocarbons as diesel (TPH-d) was detected at concentrations up to 6,600 [ig/l <br /> from four of five grab ground water samples analyzed from the western property boundary The <br /> ' subject property has no documented use of TPH-d <br /> Hydrocarbon-impacted water associated with the West UST was limited to the vicinity of the former <br /> tank location,while diesel-impacted water was documented along the western edge of the property <br /> boundary <br /> ' On 01 and 05 December 1997 a total of ten soil probe boring (P15 to P25) were established <br /> surrounding the East UST area Locations of the soil probe borings are illustrated on Figure 2 <br /> ' TPH-g and BTEX constituents were detected in soil samples collected from the probe boring <br /> advanced in the area of the East UST area at concentrations as high as 2,100 mg/kg and 14 mg/kg <br /> (xylene),respectively Hydrocarbon-impacted soil associated with the East UST area appeared to be <br /> limited to the former dispenser area(southern edge of Lindsay Street) and to a depth of sixteen to <br /> seventeen feet in depth, in the saturated soil below ground water <br /> tTPH-g was detected in six of eleven grab ground water samples collected from the East UST area <br /> at concentrations ranging from 53 to 100,000 µg/l BTEX constituents were detected in eight of <br /> �. eleven samples analyzed at concentrations ranging from 0 55 to 1,700 gg/l <br /> ' January 1998 - Installation of Ground Water Monitoring Wells <br /> In January 1998, four ground water monitoring wells were installed near the West UST area to <br /> ' quantify the hydrocarbon concentration in ground water and determine the direction of ground water <br /> flow Results of the well installation and subsequent sampling delineated the dissolved hydrocarbons <br /> and indicated direction 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 /> migration of the plume away from the West UST Locations of the monitoring wells are illustrated <br /> on Figure 2 <br /> 1 <br /> 1 <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />