ARCHIVED REPORTS - OZONE PILOT TEST & SEMI-ANNUAL GROUNDWATER MONITORING REPORT - THIRD QUARTER 2014

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' 20 March 2015 AGE Project No. 00-0769 ' Page 5 of 19 • Bromide was detected at concentrations ranging between 2.08 mg/1 (MW-3A) and 8.60 mg/I (MW-8A). • Bromate was detected at concentrations ranging between 1.28 mg/1 (MW-3A) and 6.16 mg/I (MW-1); 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 (Table 5). However, bromate concentrations were significantly above the State of California Primary MCL in baseline samples collected in June 2013, ' prior to ozone injection. • Nitrite as N and Nitrogen were detected at concentrations ranging between 1.20 mg/I in MW-3A and 9.48 mg/I in MW-2A (Nitrite as N) and between 1.23 mg/I in ' MW-3A and 12.4 mg/I in MW-2A (Nitrogen as N). • Chemical Oxygen Demand (COD), pH, electrical conductivity, total dissolved ' solids (TDS), chlorine, sulfate, and total alkalinity were all detected at low to normal background concentrations (Table 5). • Ammonia, dissolved sulfide, orto-phosphate, and fluoride were not detected above laboratory reporting limits in the groundwater samples analyzed in June 2014 (Table 5). ' Analytical results of groundwater samples collected in June 2014 are summarized in Tables 2, 4, and 5. The laboratory reports (CTEL Lab Project. No. CT214-1406022), quality assurance/quality control reports, and chain-of-custody forms are included in Appendix E. Electronic deliverable format (EDF) files and depth to water data were uploaded to the State GeoTracker database system. Graphs illustrating depth to ' groundwater, groundwater elevation and TPH-g concentrations versus time (trend graphs) for each hydrogeologic unit are presented in Appendix F. JUL Y 2014.- On 014:On 01 July 2014, a progress-pilot test monthly monitoring event was performed utilizing ' wells MW-1, MW-2A, MW-3A, MW-5A, MW-6B, MW-7B, MW-8A, MW-9A, and MW-10 as required by the MRP; depth to groundwater was measured; pH, temperature, DO and ORP were measured down-hole in non-CMT wells and from purge water in CMT wells. • Depths to groundwater ranged between 19.26 feet (MW-8A) btoc and 21.87 feet (MW-1) btoc (Table 1). Groundwater elevations at the site ranged between 8.10 feet (MW-10) below NAVD88 and 11.21 feet (MW-1) below NAVD88. • pH was measured between 6.51 and 7.84; temperature was measured between ' 22.0 and 26.6 degrees Celsius; DO was measured between 2.53 and 7.84 mg/I; and ORP was measured between -8.0 and 187.4 mV. Results of YSI Multi- Parameter Meter data is presented in Table 3. ' Advanced GeoEnvironmental Inc.