ARCHIVED REPORTS SECOND SEMIANNUAL AND 2013 ANNUAL GROUNDWATER MONITORING REPORT

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2. Results for Second Semiannual Period 2013 This section presents the groundwater monitoring results for the second semiannual period 2013, the status of remediation and other completed activities for the second semiannual period 2013, and planned activities for the next semiannual monitoring period. 2.1 Groundwater Monitoring The following groundwater monitoring activities were performed in the second semiannual period 2013 (April through September 2013),in accordance with MRP No. R5-2007-0831. • Depth to groundwater was measured on September 13,2013, in 15 shallow (less than 25 feet below ground surface [bgs]) onsite groundwater monitoring wells and 1 deeper (greater than 35 feet bgs) onsite groundwater monitoring well. • Groundwater samples were collected on September 13,2013, from the 13 of the 15 shallow wells and from the 1 deeper well scheduled to be sampled. • Groundwater and quality assurance samples were analyzed by a state-certified laboratory. 2.1.1 Methods The following wells were gauged and sampled: ' Order Well Gauge Method 1 Upgradient wells: M-1, M-2*, M-3* Single-Phase Probe 2 Sentinel wells: M-8, N-18, N-19, N-20 Single-Phase Probe 3 Deep well: N-24 Single-Phase Probe 4 Plume fringe wells: M-10, N-8, 0-1 Single-Phase Probe 5 Plume wells: N-7, N-15, N-16, N-17, RW-1 Single-Phase Probe *Wells M-2 and M-3 were gauged only and not sampled, as scheduled The wells were gauged and sampled in the order indicated above (from cleanest to most contaminated) to minimize the potential for cross contamination. Figure 2 shows the locations of the wells,and Table 1 presents a summary of the construction details of the wells. 1 Field Methods Field gauging and sampling activities were conducted by Blaine Tech Services,located in Sacramento,California. Copies of field notes from Blaine Tech are provided in Appendix A. WBG101513183707SCO MOLT_2SA13-REPORT-FINAL 2-1