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Site Background Information Five Star Marina <br /> Page 3 of 3 <br /> while diesel-Impacted water was documented along the western edge of the property boundary <br /> 1 <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 <br /> Lindsay Street),and to a depth of 16 feet to 17 feet bsg,in the saturated soil below the ground water <br /> ' 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/l to 100,000 µg11 BTEX was detected in eight of eleven <br /> ' samples analyzed at concentrations ranging from 0 55 µg/1 to 1,700 µg11 <br /> Results of soil and grab ground water samples from site investigations are summarized to Tables Al, <br /> ' A2, A3, and A4 of this appendix <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 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 The destruction of momtoring well MW-UST was performed on 15 February 2005 by Mitchell <br /> Drilling Environmental of Rancho Cordova, California under EHD oversight As per verbal <br /> Instructions given In the field by EHD personnel,well destruction activities were performed utilizing <br /> ' a CME-75HT truck-mounted drill rig to pull approximately one-half of the well casing out of the <br /> 15-foot boring The boring,with the remaining portion of the well casing in place,was backfilled <br /> ' to surface grade with type I/II Portland cement <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />