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Work Plan for Groundwater Investigation and Groundwater Monitoring Well Installation Field Maintenance Shop #24, Stockton, California 3.8 SOIL BORING AND GROUNDWATER MONITORING WELL SURVEYING Following abandonment of the direct -push MIP borings and completion of groundwater well installation, a California -registered land surveyor will be contracted to survey the horizontal locations of the MIP borings and the horizontal and vertical locations of the new groundwater monitoring wells. For the wells, horizontal control will be established for the center of the well vault, and vertical control will be established at the top north side of the inner PVC casing. Adjacent land surface elevation and top -of -well vault elevation will also be surveyed. Horizontal datums will be in accordance with the appropriate California State Plane Coordinate System, and elevations will be in accordance with mean sea level per NAVD88. Horizontal and vertical survey accuracies will be ±0.5 feet and ±0.01 feet, respectively. All surveying activities will be in complete accordance with standards for uploading Geo Tracker data. 3.9 INVESTIGATION DERIVED WASTE MANAGEMENT During the advancement of soil borings and the installation, development, and baseline sampling of the new groundwater monitoring wells, investigation -derived waste (IDW) in the form of soil from borings, disposable equipment, development water, decontamination rinsate, and excess purge water will be generated. IDW will be managed separately as follows: • Soil, disposable personal protective equipment (PPE), and other solid waste generated during well installation and/or direct push boring advancement will be temporarily stored on-site in either a 20 -yard roll -off bin with appropriate liners, or containerized in appropriately -labeled 55 -gallon Department of Transportation (DOT) -rated drums. Any solid wastes generated during routine groundwater monitoring events will be containerized in appropriately -labeled 55 -gallon DOT -rated drums. These materials may be stored together or in separate containers based on volume constraints or a field assessment regarding combining wastes. • Development water and decontamination rinsate (well installation), and purge water and decontamination rinsate (groundwater sampling) will be containerized in appropriately - labeled 55 -gallon DOT -rated drums. IDW will be stored on site at locations to be agreed on with site personnel in advance, pending characterization and profiling for disposal as described below. Representative samples of IDW will be collected from each roll -off bin and/or drum and submitted to a California -certified laboratory under appropriate COC documentation. Specific analyses for profiling may vary and will be subject to the specific requirements of the disposal facility. Analyses will likely include: • TPH-d using USEPA Method 8015 -Modified: • VOCs including TPH-g, Naphthalene, BTEX, and Fuel Oxygenates using USEPA Method 826013; and • CAM 17 Metals using USEPA Method 601013/7000. Laboratory analyses will be used to complete the waste profiles submitted to the disposal facility. Upon disposal facility approval of the waste profiles, the roll -off bin(s) and drums will be transported off site by a licensed waste hauler and disposed of at an approved, licensed disposal facility. OTI E 15