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Site Background Information Five Star Marina <br /> g a ma <br /> Page 3 of 3 <br /> boundary The subject property has no documented use of TPH-d <br /> To determine the lateral extent of the hydrocarbon impact to soil and ground water associated with <br /> the West UST, and the potential impact from the Texaco facility to the subject property, soil probe <br /> ' borings were advanced at the site under the supervision of the EHD <br /> Hydrocarbon-impacted water associated with the West UST was limited to vicinity of the former <br /> ' tank location, while diesel-impacted water was documented along the western edge of the property <br /> boundary <br /> iOn 01 December and 05 December 1997, a total of ten soil probe boring (P16 to P25) were <br /> established surrounding the East UST area Locations of the soil probe borings are illustrated on <br /> ' 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(xylene), 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 to 17 feet, in the saturated soil below the ground water table <br /> lie TPH-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 was detected in eight of eleven samples <br /> ' analyzed at concentrations ranging from 0 55 to 1,700 µg11 <br /> Results of soil and grab groundwater samples from site investigations are summarized in Tables A 1, <br /> A2, A3 and A4 <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 /> Advanced GeoEnvironwentai,ine <br />