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2. Results for Second Semiannual Period 2011 <br /> This section presents the groundwater monitoring results for the second semiannual period <br /> 2011, the status of remediation and other completed activities for the second semiannual <br /> period 2011,and planned activities for the next semiannual monitoring period. <br /> L 2.1 Groundwater Monitoring <br /> L The following groundwater monitoring activities were performed in the second semiannual <br /> period 2011 (April through September 2011),in accordance with MRP No. R5-2007-0831. <br /> e Depth to groundwater was measured on September 1,2011, in 15 shallow (less than <br /> L 25 feet below ground surface [bgs]) onsite groundwater monitoring wells and 1 deeper <br /> (greater than 35 feet bgs) onsite groundwater monitoring well. <br /> e Groundwater samples were collected on September 1,2011,from 13 of the shallow wells <br /> and the 1 deeper well. Well N-18 was resampled on June 1,2011, during the second <br /> semiannual period of 2011, due to the detection of low concentrations of total petroleum <br /> lye hydrocarbons (TPH) and benzene,toluene,ethylbenzene,and total xylenes (BTEX) <br /> during the first semiannual 2011 sampling and N-18 resampling events in March 2011. <br /> e Groundwater and quality assurance samples were analyzed by a state-certified <br /> laboratory. <br /> In addition,HydraSleeve samples were collected from six shallow wells and one deeper <br /> L well on September 1,2011,during the second semiannual sampling event. The HydraSleeve <br /> samples were collected as SFPP requested and were approved in an email from the RWQCB <br /> on October 29, 2010.The standard purge and HydraSleeve samples were collected to <br /> compare the analytical results of both sampling methods to evaluate using the HydraSleeve <br /> sampling method in future sampling events instead of using the general standard purge <br /> methodology. The HydraSleeves were set in the wells during the first semiannual <br /> b„ monitoring event on March 2,2011,and the HydraSleeve samples were collected for the <br /> current event on September 1,2001. <br /> 2.1.1 Methods <br /> The following wells were gauged and sampled: <br /> Order well Gauge Method <br /> 1 Upgradient wells: M-1, M-2`, M-3` Single-Phase Probe <br /> 2 Sentinel wells: M-8, N-18, N-19, N-20 Single-Phase Probe <br /> 3 Deep well: N-24 <br /> Single-Phase Probe <br /> 4 Plume fringe wells: M-10, N-8, 0-1 Interfere Probe <br /> 5 Plume wells: N-7, N-15, N-16, N-17, RW-1 Interface Probe <br /> `Wells M-2 and M-3 were gauged only, not sampled. <br /> ES102411163308SCO/LW3521.DOCXH12g70003 21 <br />