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' GW&SW Monitoring Report COE-WDR Project No. 894.2 ' September 1,2011 ' Field measurements were recorded for the following parameters: • Groundwater Elevation (0.01 ft) • Temperature ' • pH • Specific Conductance (EC) • Dissolved Oxygen(DO) ' 3.4 Groundwater Analytical Discussion The analytical results are discussed below. Summary analytical data are included in Table 2 ' of Appendix A. A site map with monitoring well locations is included as Figure 2. The analytical data lab sheets are included in Appendix B. ' The 3rd quarter 2011 groundwater analytical data are summarized as follows: • Generally the concentrations of the various groundwater analytes showed minor ' fluctuations this quarter with no significant increases or decreases occurring and the concentrations found are within the range observed thus far. ' • Total dissolved solids (TDS) — reported concentrations that ranged from 404 mg/l (MW-7) to 614 mg/l (MW-11) and decreased in all other wells during the 3`d quarter 2011 groundwater monitoring event with the exception of MW-8 and MW-11. • Fixed dissolved solids (FDS) — reported concentrations that ranged from 172 mg/l (MW-3) to 516 mg/l (MW-11) and increased in all other wells during the 3rd quarter 2011 groundwater monitoring event with the exception of MW-3, MW-4 and MW-6. ' • Volatile dissolved solids (VDS) — reported concentrations that ranged from 14 mg/l (MW-5) to 318 mg/l (MW-3) and decreased in all other wells during the 3rd quarter 2011 groundwater monitoring event with the exception of MW-3, MW-4, MW-6, and ' MW-8. • Nitrate as Nitrogen — reported concentrations that ranged from ND<0.5 mg/l (MW-6 and MW-11) to 29.6 mg/1 (MW-8) and decreased in all other wells during the 3rd ' quarter 2011 groundwater monitoring event with the exception of MW-3, MW-8, MW-9, and MW-10. • Sodium concentrations were reported to range from 23 mg/1 (MW-9) to 86 mg/l ' (MW-3) and decreased or remained the same in all other wells during the 3`d quarter 2011 groundwater monitoring event with the exception of MW-7. • Chloride concentrations were reported to range from 22 mg/l (MW-10) to 88 mg/l ' (MW-1) and increased in all other wells during the 3`d quarter 2011 groundwater monitoring event with the exception of MW-9 and MW-10. • BOD5 — was reported in concentrations that ranged from ND<1 mg/l (MW-3 and ' MW-4) to 13.7 mg/L (MW-6) and decreased in all other wells during the 3`d quarter 2011 groundwater monitoring event with the exception of MW-6, MW-9, MW-10 ' and MW-11. ' Geological TechAics Inc. 5 894 3rd QMR l Ldoc