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12 June 2012 AGE-NC Project No. 99-0682 Page 4 of 7 • Hexavalent chromium was not detected above the laboratory reporting limit (0.2 pg/1) in ground water samples collected from wells MW-1A, MW-6, MW-7, and MW-8. • Bromide was detected in samples collected from wells MW-1A, MW-6, MW-7, and MW-8 at concentrations ranging between 1.68 mg/I (MW-7)and 6.12 mg/I (MW-6). • Bromate was detected in samples collected from wells MW-1A, MW-6, and MW-8 at concentrations ranging between 1.55 mg/I (MW-1A) and 2.86 mg/I (MW-6). Bromate concentrations were significantly above the State of California Primary MCL of 0.01 mg/I for drinking water. Additionally, the laboratory detection limit for bromate (1.0 mg/1) was above the Primary MCL of 0.01 mg/I. • Nitrate as N and Nitrite as N were detected in ground water samples collected from wells MW-1A, MW-6, MW-7, and MW-8 at concentrations ranging between 0.300 mg/I and 0.900 mg/1 (Nitrate as N) and between 4.00 mg/I and 11.00 mg/I (Nitrite as N). • Nitrate as NO3was detected in samples collected from wells MW-1A, MW-6, MW-7, and MW-8 at maximum concentrations of 3.90 mg/I (MW-1A); concentrations were below the Primary MCL (Table 4). • Dissolved oxygen (DO), pH, electrical conductivity, total dissolved solids (TDS), chloride, sulfate, redox potential (ORP), and salinity were all detected at low to normal background concentrations. • Ammonia was detected in samples collected from wells MW-1A, MW-6, MW-7, and MW-8 at concentrations of 0.900 mg/I, 1.80 mg/1. 0.620 mg/I, and 4.98 mg/1, respectively. No additional analyteswere reported atorabove laboratory detection limits in ground water samples analyzed. Analytical results of water samples collected in April 2012 are summarized in Table 2. Graphs depicting trends in depth to ground water measurements and contaminant concentrations in the monitoring well network are included in Appendix E. The laboratory report(Cal Tech Environmental Laboratories Project No. CT214-1204159), quality assurance/quality control reports, and chain-of-custody forms are included in Appendix F. Electronic deliverable format (EDF) files and depth-to-water data will be uploaded to the State GeoTracker database. Advanced GeoEnvironmental,Inc.