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sample collected from well MW-9. TPHG, benzene, MTBE, and 1,2-DCA appear to be <br /> adequately delineated to the east and south. Figures 11 through 14 illustrate the distribution of <br /> TPHG and benzene in the upper and lower watcr-bearing zones. <br /> Former Sunland Gasoline Facility <br /> A groundwater sample collected in 2000 from 47 feet bgs in boring B-1 was impacted with <br /> TPHG (100,000 pg/L), benzene (12,000 µg/L), and MTBE (720 µg/L). The dissolved <br /> concentrations of benzene and MTBE exceed the current State of California MCLS of 1 µglL and <br /> 13 pg/L, respectively. Analytical results of this groundwater sample are included in Appendix B. <br /> The fuel oxygenate compound MTBE has only been detected in well MW-5 twice (second <br /> quarter 2001 and second quarter 2002), and in well MW-8 once (second quarter 1999). The <br /> concentrations in all cases have been below the current primary MCL of 13 pg/L and the <br /> secondary MCL of 5 pg/L. The compound TBA is a breakdown product of MTBE. Given the <br /> lack of significant quantities of MTBE at the Apache site, the identification of significant <br /> concentrations of MTBE in groundwater at the Sunland site, and the likelihood that impact from <br /> the Sunland site had co-mingled with the Apache impact, it appears likely that the TBA <br /> identified in the groundwater beneath the Apache site might be emanating from the former <br /> Sunland facility. <br /> p_\Apache PlasticslReports\Apache SCM.doc Page 10 <br />