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' Site Background Information Five <br /> g Star Marina <br /> 1 Page 3 of 3 <br /> Impacted water associated with the West UST was limited to vicinity of the former tank location, <br /> while diesel-Impacted water was documented along the western edge of the property boundary <br /> On 01 and 05 December 1997, a total of ten soil probe boring (P16 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 were detected in soil samples collected from the probe borings at concentrations <br /> ' as high as 2,100 mg/kg and 14 mg/kg(xylenes),respectively Hydrocarbon-Impacted soil associated <br /> with the East UST area appeared to be limited to the former dispenser area(southern edge of Lindsay <br /> ' Street), and to a depth of 16 feet to 17 feet bsg, in the saturated soil below the ground water table <br /> TPH-g was detected in six of eleven grab ground water samples collected from the East UST area <br /> ' at concentrations ranging from 53 µg/1 to 100,000 µg/1 BTEX was detected in eight of eleven <br /> samples analyzed at concentrations ranging from 0 55 µg/1 to 1,700 41 <br /> ' Results of soil and grab ground water samples from site Investigations are summarized in Tables Al, <br /> A2, A3, and A4 of this appendix <br /> 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 ofthe well installation and subsequent sampling delineated the dissolved hydrocarbons <br /> and indicated direction of ground water flow to be generally toward 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 area Locations of the monitoring wells are <br /> Illustrated on Figure 2 <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />