ARCHIVED REPORTS_REMOVAL ACTION COMPLETION REPORT

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Draft Removal Action Completion Report Neighborhood C, Mountain House,CA Page 7 soil movement activities for a total of 18 days between October 18 and November 27, 2013. The last two days (November 26 and 27), air monitoring was conducted because waste soil encapsulated in Great Valley Parkway was being excavated to make room for utility crossings. 3.6.1 Air Monitoring In consultation with DTSC, air monitoring was performed during Site activities in which contaminated or potentially contaminated materials were being disturbed, moved, or otherwise exposed to wind. The Air Monitoring Officer was responsible for implementing the Air and Meteorological Monitoring Plan. Chemical air monitoring procedures and results are discussed in Section 4 and 5 on the following pages. 3.6.1.1 Responsibilities of the Air Monitoring Officer The Air Monitoring Officer was properly trained in the use and maintenance of air monitoring and meteorological monitoring equipment. Responsibilities of the Air Monitoring Officer included: • Monitoring and documentation of dust levels at the work zone and property fencelines. The Site Air Monitoring Officer had the authority to stop work in the event that on Site activities generated dust levels that exceed the dust monitoring action levels defined below. The Air Monitoring Officer maintained on-Site meteorological instrumentation, documented meteorological conditions, and coordinated with off-Site meteorological professionals to identify conditions that may have required cessation of work(e.g., excessive winds). If wind speeds exceeded 25 miles per hour instantaneously or there was visual evidence of wind carrying dust off-Site, then a more aggressive approach to dust control was implemented immediately. Increased dust controls included additional spray-applied water from water trucks. • Assured that all air sampling equipment and media were properly calibrated and in good working condition. Real-time, data-logging dust monitors, Thermo Electron Corp. personaldataRAM, model pDR-1000AN/1200, were used to measure dust levels. The personaldataRAM instruction manual is included in Appendix D. Real-time information was posted daily and discussed with Site workers. • Recordkeeping activities and general Site safety support of the Site Manager. 3.6.1.2 Air Monitoring Strategy and Methods Prior to use each day, air and dust monitors were calibrated according to manufacturer's specifications. The Air Monitoring Officer monitored dust and dieldrin levels in the following general locations (Figure 6, Appendix A): • One fenceline monitoring location upwind using a real-time data-logging (15-minute intervals) dust monitor and an air sampler for dieldrin(west of the Site boundary,"upwind"). • Two fenceline monitoring locations downwind using real-time data-logging dust monitors and air samplers for dieldrin(at western Site boundary, "residences") and along Grant Line Road"Grant Line". • Work Zone: by a real-time mobile personal dust monitor at various locations where daily activities were taking place in the exclusion zone"work zone". The Air Monitoring Officer monitored and recorded the dust concentrations at the work zone and at the fenceline monitoring locations at approximately 30-minute intervals in general accordance with the RAW. The Air Monitoring Officer regularly checked the functionality of the dust monitors and air samplers. Work Zone and Fenceline Action Levels specified in the RAW are included in Table 1 on the following page.