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Mr Harlin Knoll <br /> May 1998 <br /> Page 7 <br /> 1 <br /> On 19 and 20 March 1998, following the additional removal activities, all <br /> ground water removed from the tank excavations during the UST and <br /> additional soil removal activities was treated and discharged to the <br />' sanitary sewer system The ground water was treated to non-detectable <br /> concentrations of TPH-g and BTEX using granular activated carbon In <br /> order to ensure all ground water was properly treated prior to discharge, <br /> a water sample was collected from the discharge stream of each activated <br /> carbon treatment unit The sample results are shown on Tables 1 and 2 <br /> and copies of the analytical reports are included in Attachment 2 <br /> Soil and Ground Water Investigation <br /> n the results of the samples collected following Based o p g the additional <br />' removal activities, ERM conducted a soil and ground water investigation <br /> in the areas surrounding the two UST locations to determine the extent of <br /> soil and ground water contamination in the vicinity of the USTs ERM <br /> submitted a workplan to the County for conducting the investigation on <br /> 27 March 1998 and the County subsequently approved the workplan <br /> The investigation methods and results at each UST location are presented <br /> below <br /> UST#T Investigation <br /> The investigation at the former UST #1 location was conducted on 2 and <br />' 3 April 1998 To determine the extent of soil impact in the vicinity of the <br /> former UST, soil samples were collected in the unsaturated zone <br /> (approximately 3 to 5 feet bgs) and directly above the water table <br />' (approximately 7 feet bgs) from two locations (HB-15 and HB-16) <br /> surrounding the UST #1 excavation (Figure 2) To characterize the extent <br /> of impact to site ground water, ERM collected ground water hydropunch <br />' samples from five locations (HB-6 through HB-10) around UST #1 <br /> (Figure 2) In addition, ERM collected soil samples directly above the <br /> water table (approximately 5 to 7 feet bgs) from each of the ground water <br />' sample locations (HB-6 through HB-10) to determine the extent of <br /> ground water impact to soil The samples were analyzed for the same <br />' compounds that were analyzed for during the previous sampling event <br /> Lithologic logs for all borings installed during the investigation are <br /> !� included as Attachment 3 to this report <br />' e sults are resented on Table 1 For the samples collected in <br /> Th sample re p p <br />' the vicinity of UST #1 (HB-15 and HB-16), the samples collected within <br /> the unsaturated zone did not contain detectable concentrations of TPH-g <br />