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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 2.0 TREATABILITY STUDY ACTIVITIES 2.1. PRELIMINARY ACTIVITIES In preparation for implementation of the treatability study described in this document, OTIE performed a number of preliminary activities associated with permitting, underground utility clearance, well installation, and management of investigation derived waste (IDW). These activities are described in further detail below. 2.1.1. Permitting The San Joaquin County Environmental Health Department (SJCEHD) is the lead agency providing oversight for well installations in San Joaquin County. On behalf of the CA ARNG, OTIE filed a well permit application addressing all the proposed wells. Installation of the wells, as detailed below, was in strict accordance with SJCEHD requirements, and with California Well Standards, as applicable. In addition, OTIE coordinated appropriate inspections for well constructions with SJCEHD, and provided to that agency a copy of the applicable sections of the Work Plan, as requested. Once all necessary approvals and permits were in place, field activities were scheduled. A copy of the SJCEHD permit is included in Appendix A to this report. The SVE and HVDPE portions of the test did not require a permit from the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) per SJVUAPCD Rule 2020 Section 7.5, which exempts a soil remediation pilot study of up to five days from an Authority to Construct (ATC) and Permit to Operate (PTO). 2.1.2 Underground Utility Clearance Prior to implementing invasive field activities, OTIE ensured that the proposed well locations were cleared for underground utilities or other obstructions. This clearance included: • Reviewing with CA ARNG personnel available site drawings indicating the approximate locations of all underground utilities (e.g., water, sewer, telecommunications, cable television, electric, and gas) associated with site operations, making use of any anecdotal information that may be available through CA ARNG personnel familiar with site operations; • Marking the proposed locations with white spray paint; • Clearing the specific locations using a contracted private utility locator, who employed appropriate geophysical techniques to clear each location from potential underground obstructions; and • Making appropriate notification to Underground Service Alert (USA) at least 48 hours prior to commencement of invasive drilling activities. 2.2. WELL INSTALLATIONS During the interval from 7 to 11 May, 2012, OTIE oversaw the installation of five (5) wells associated with the treatability study. These included SVE well SVE-1, two nested AS wells (AS -1A/1 B), and two HVDPE wells (FMS-DPE1 and FMS-DPE2/MW6). HVDPE well FMS-DPE2/MW6 may be used as part of the site groundwater monitoring program going forward. The locations of the wells relative to historical soil and groundwater sampling locations are shown in Figure 3. All wells were drilled (using HSA drilling), installed, and developed by Woodward Drilling, a California -licensed C-57 drilling contractor, under the oversight of a California Professional Geologist (PG). Boring logs and well completion diagrams are presented as Appendix B. OTIE