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Work Plan for Groundwater Monitoring Well Installation, <br /> Soil Gas and Groundwater Investigation, <br /> and Groundwater Monitoring <br /> Army Aviation Support Facility Stockton California <br /> constitute the first of four planned quarterly groundwater monitoring events to include all five site <br /> wells. A report documenting groundwater monitoring activities and findings, as described below, <br /> will be submitted following the monitoring event. The first quarterly report will also include <br /> documentation for groundwater monitoring well installation and sampling and the grab <br /> groundwater and soil gas investigation described above. <br /> 3.8 GROUNDWATER MONITORING WELL AND DIRECT-PUSH BORING SURVEYING <br /> Following abandonment of the direct-push borings and completion of groundwater well <br /> installation, a California-registered land surveyor will be contracted to survey the horizontal and <br /> vertical locations of each newly installed well and recently completed boring. For the wells, <br /> horizontal control will be established for the center of the well vault, and vertical control will be <br /> established at the top north side of the inner PVC casing. Adjacent land surface elevation and <br /> top-of-well vault elevation will also be surveyed. Horizontal datums will be in accordance with <br /> the appropriate California State Plane Coordinate System, and elevations will be in accordance <br /> with mean sea level per NAVD88. Horizontal and vertical survey accuracies will be±0.5 feet <br /> and ±0.01 feet, respectively. All surveying activities will be in complete accordance with <br /> standards for uploading Geo Tracker data. <br /> 3.9 INVESTIGATION-DERIVED WASTE (IDW) <br /> During the advancement of soil borings, installation and development of groundwater monitoring <br /> wells, grab groundwater and soil gas sampling, and subsequent quarterly groundwater <br /> monitoring events, investigation-derived waste (IDW) in the form of soil from borings, disposable <br /> equipment, development water, decontamination rinseate, and excess purge water will be <br /> generated. IDW will be managed separately as follows: <br /> • Soil, disposable personal protective equipment (PPE), and other solid generated during <br /> well installation and/or direct push boring advancement will be temporarily stored on-site in <br /> a 20-yard roll-off bin with appropriate liners. Any solid wastes generated during routine <br /> groundwater monitoring events will be containerized in appropriately-labeled 55-gallon <br /> Department of Transportation (DOT)-rated drums. These materials may be stored together <br /> or in separate containers based on volume constraints or a field assessment regarding <br /> combining wastes. <br /> • Development water and decontamination rinseate (well installation), and purge water and <br /> decontamination rinseate (groundwater sampling events) will be containerized in <br /> appropriately-labeled 55-gallon DOT-rated drums. <br /> IDW will be stored on site at locations to be agreed on with site personnel in advance, pending <br /> characterization and profiling for disposal as described below. <br /> Representative samples of IDW will be collected from each drum and submitted to a California- <br /> certified laboratory under appropriate COC documentation. Specific analyses for profiling may <br /> vary and will be subject to the specific requirements of the disposal facility. Analyses will likely <br /> include: <br /> • TPH-d, TPH-g using USEPA Method 8015-Modified: <br /> • VOCs including Naphthalene, BTEX, and Oxygenates using USEPA Method 826013; and <br /> • CAM 17 Metals using USEPA Method 601013/7000. <br /> OTI E 14 <br />