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 11 of 19 presented in Appendix F. Additionally, graphs illustrating TPH-g, benzene, and 1,2-DCA concentrations versus time for wells MW-1, MW-3/13, and MW-5A are presented in Appendix F. SEPTEMBER 2014 ' On 04 September 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; pH, temperature, DO and ORP were measured down- hole in non-CMT wells and from purge water in CMT wells; depth to water measurements were inadvertently not collected. • pH was measured between 6.18 and 6.93; EC was measured between 243 and 355 pS/cm; temperature was measured between 20.8 and 23.2 degrees Celsius; DO was measured between 1.68 and 2.82 mg/I; and ORP was measured ' between 41.50 and 109.0 mV. Results of YSI Multi-Parameter Meter data is presented in Table 3. ' OCTOBER 2014 On 02 October 2014, a final pilot test monthly monitoring and sampling 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, EC, and temperature were measured during well purging and final values after purging ' was complete were utilized; DO and ORP were measured down-hole prior to purging in non-CMT wells and from purge water during the initial purge volume in CMT wells; and groundwater samples were collected in each of the above-mentioned wells. ' Groundwater samples were analyzed for the constituents required in the MRP (Appendix B). • Depths to groundwater ranged between 20.80 feet (MW-8A) btoc and 22.91 feet (MW-1) btoc (Table 1). Groundwater elevations at the site ranged between 9.19 feet (MW-10) below NAVD88 and 12.25 feet (MW-1) below NAVD88. ' • TPH-g were detected in groundwater samples collected from wells MW-1, MW-2A, MW-3A, MW-5A, MW-6B, MW-713, MW-8A, MW-9A, and MW-10 at concentrations ranging from of 500 pg/1 in MW-9A to 130,000 pg/I in MW-1. BTEX were detected in groundwater samples collected from all nine wells sampled at maximum concentrations of 15,000 pg/I benzene, 65,000 pg/I ' toluene, 4,100 pg/I ethylbenzene, and 30,000 pg/I total xylenes (Table 2). • pH was measured between 7.10 and 7.75; EC was measured between 805 and 1,844 pS/cm; temperature was measured between 19.5 and 23.4 degrees ' Celsius; DO was measured between 0.84 and 5.25 mg/I; and ORP was measured between -4.3 and 112.8 mV. Results of YSI Multi-Parameter Meter data is presented in Table 3. Advanced GeoEnvironmental Inc.