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Treatability Study Report and Feasibility Evaluation for In Situ Petroleum Hydrocarbon Remediation Field Maintenance Shop #24, 8020 South Airport Way Stockton, California Appendix C (CD-ROM only). These results are addressed in further detail below in the sections addressing the respective components for the AS (Section 4) and HVDPE (Section 5) treatability studies. 2.6. WELL SURVEYING Following completion of well installation and the associated soil and groundwater sampling described above, a California -registered land surveyor was contracted to survey the horizontal and vertical locations of each newly installed well. Horizontal control was established for the center of the well vault, and vertical control was established at the top north side of the inner PVC casing. Adjacent land surface elevation and top -of -well vault elevation were also surveyed. All surveying activities were in accordance with standards for uploading Geo Tracker data. Horizontal datums were in accordance with the appropriate California State Plane Coordinate System, and elevations were in accordance with mean sea level per NAVD88. Horizontal and vertical survey accuracies were ±0.5 feet and ±0.01 feet, respectively. Documentation provided by the land surveyor is included with field documentation in Appendix D. 2.7. WASTE DISPOSITION As described above, various IDW generated during well installation, including soil cuttings, well development water, and purge/decontamination rinseate from groundwater sampling. Soil cuttings were stored in a 15 -ton roll -off bin until soils were characterized for disposal. Development water and purge/decontamination rinseate were stored with water generated during treatability study implementation in a poly tank maintained in the work area. Disposal manifest documentation for these waste streams is presented in Appendix E. OTI E 13