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6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the results of this additional assessment, it appears that the lateral and vertical extent of TPH- <br /> ' G and MTBE has been adequately defined in all directions, including to the east of the site, in the area <br /> of the soil boring SHP-6, and newly installed groundwater monitoring wells MW-9 and MW-10. TPH- <br />,I ' G and MTBE are present in the shallow groundwater and have migrated only a short distance generally <br /> 1' down gradient on site near groundwater monitoring wells MW-2 and MW-5. The maximum TPH-G <br /> and MTBE concentrations detected in the groundwater samples from this investigation were 8,900 µg/l <br /> for both constituents the sample from SHP-2, which is located near MW-2, approximately 25 feet <br /> down-gradient of the pump island. Concentrations of TPH-G, BTEX compounds, fuel oxygenates and <br /> 1,2-DCA were not detected in the soil sample obtained from soil boring SHP-b located to the east of . <br /> soil boring SB3. <br /> Based on this investigation, ATC recommends the following: <br /> ■ The new down gradient monitoring wells MW-9 and MW-10, and the previously installed site. <br /> monitoring wells should be monitored on a quarterly basis. <br /> ■ Completion of the Feasibility Study described in the ATC's "Workplan for Additional <br /> ' Assessment and Feasibility Study"dated June 1, 2001. <br /> ATC believes that no further assessment work related to the site is needed at this time. <br /> • <br /> 1;41n Y—,—IQ,,W.STOP+llti 1111RE.PI111TS111WIISnil dnn:.and Kell In•I+Il.iinn.Jix ! <br />