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xr <br /> ' S E C 0 R <br /> ' �GC�OG3 <br /> • �� I I I.I IYY�YI 11 IIIII YYY <br /> 532 B Monitoring Zone Trends <br /> h <br /> Concentrations of TPHg and benzene in on-site B monitoring zone wells MW-6, MW-8, MW-9, <br /> and MW-10 are decreasing Concentrations of TPHG in on-site well MW-5 are fluctuating, but <br /> benzene has decreased to less than the laboratory reporting limit Concentrations of MtBE in <br /> on-site B monitoring zone wells MW-6, MW-7, and MW-8 are reported at low levels periodically <br /> Concentrations of MtBE are increasing in groundwater at MW-5, MW-9, and MW-10 <br /> Concentrations of 1,2-DCA in groundwater at MW-7 were consistent (2 2 to 2 4 ppb) for the first <br /> four quarters of 1,2-DCA analysis but increased during the subsequent two quarters The <br /> ' concentration decreased during the second quarter 2005 event Concentrations of 1,2-DCA are <br /> increasing in groundwater at MW-8 and MW-9 <br /> Concentrations of TPHg in off-site wells MW-11 through MW-14 have fluctuated from less than x <br /> the reporting limit during initial sampling to concentrations ranging from 56 ppb to 120 ppb and <br /> back to less than the reporting limit, with the exception of MW-13, which had a second quarter Y ; <br /> 2005 TPHg concentration of 71 ppb Benzene was reported in off-site wells MW-11 and MW-14 =` <br /> r during one sampling event but is currently less than the reporting limit for both wells MtBE has <br /> been fluctuating in off-site well MW-12 at concentrations ranging from 1 1 ppb to 7 3 ppb 1,2- gip= <br /> DCA has been reported in each of the off-site B monitoring zone wells 1,2-DCA concentrations <br /> within well MW-11, MW-12, and MW-13 have consistently ranged between 7 3 and 35 ppb The <br /> 1,2-DCA concentration in well MW-14 has varied between 3 2 ppb and 4 8 ppb Graphs of <br /> • concentrations vs time and groundwater elevation vs time are included in Appendix G IK <br /> F <br /> 5.33 C Monitoring Zone Trends �q <br /> ' No trends are apparent in the C monitoring zone wells because adequate data for determining a <br /> trend have not been collected ; <br /> t� <br /> 4�s hr4v <br /> K ty <br /> rydF <br /> �M <br /> k <br /> ,e <br /> Updated SCM 2005 doc 15 <br /> 77CP 64409 05 0005 <br /> 't <br /> T , <br />