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T&T Trucking <br /> Subsurface Investigation Results and Site Conceptual Model <br /> Page 2-2 <br /> 57 5-ft deep had low level detections of total petroleum hydrocarbons (TPH) or benzene, toluene, <br /> ' ethylbenzene, and total xylenes (BTEX) <br /> In August 1998, BC was retained by T&T Trucking to oversee the installation of three additional <br /> monitoring wells Monitoring wells MW-2, MW-3, and MW-4 were placed to the north, south, and <br /> southeast of the former UST location (Figure 1-2) Groundwater monitoring for the four <br /> monitoring wells has been conducted quarterly, starting during the first quarter of 2000 Results for <br /> the most recent quarter of sampling (May 2003) show concentrations of Methyl Tertiary-Butyl Ether <br /> (MtBE) from below the measured reporting limit to 53,000 mncrogram per liter (µg/L), Total <br /> Petroleum Hydrocarbons as Gasoline (TPH-g) from below the measured reporting hnut to 170 <br />' ug/L and benzene from below the measured reporting limit to 4 4 lag/L On November 12, 2002 <br /> the unused domestic well north of the former UST location was properly destroyed by T&T <br />' Trucking under the supervision of the County <br /> i <br /> a <br /> i <br /> I <br /> 1 C\Document~and Settings\%henJ%nc\A1y Documents\Wort.1n Projgcss\E&1 1 racking doe <br />