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Treatability Study Report and Feasibility Evaluation for In Situ Petroleum Hydrocarbon Remediation Field Maintenance Shop #24, 8020 South Airport Way Stnrktnn California o On May 14, 2012, conducting one day of SVE-only testing (8.25 hours) to determine technology functionality, mass removal rates, and ROI. Tests include a 6 -hour test in the shallow SVE well and short-term (approximately 1 -hour) tests in three additional wells. • Between May 15 and May 16, 2012, conducting two days of AS testing (one day per nested well) to determine technology functionality and estimate the zone of influence. • Between May 17 and May 18, 2012, conducting two days of HVDPE testing (one day on each of the two HVDPE) wells to determine technology functionality, mass removal rates, and radius of influence. • Based on the results of the treatability study and applicable groundwater monitoring data, performing feasibility screening to identify a suitable approach for remediation of site soil and groundwater, as appropriate. All activities associated with the proposed scope of work were performed to meet the CVRWQCB's directives pursuant to the Clean Water Act and California's Porter -Cologne Water Quality Act. 1.2. PROJECT SITE DESCRIPTION Information provided in this and subsequent sub -sections was derived primarily from the 2004 Versar and 2007 URS reports, along with observations made by OTIE since initiating site investigation activities in March 2010. 1.2.1. Site Setting The site is located at 8010 South Airport Way, Stockton, California (Figure 1). It is one of four state-owned divisional areas operated by the CA ARNG, including the Army Aviation Support Facility (AASF), the Armory, and the Combined Support Maintenance Shop (CSMS). The areal relationship of these divisional areas to each other is indicated in Figure 2. The FMS consists of a one-story maintenance building composed of work bays, supply areas, a latrine, and offices, a vehicle inspection rack, hazardous materials storage sheds, a concrete wash pad with an associated holding tank, and the location of the former USTs and associated fuel dispensers. The two former USTs (one 5,000 -gallon diesel and one 10,000 -gallon gasoline) were removed in April 1996, and soil samples collected during removal and excavation of the USTs and associated piping indicated that releases of diesel fuel and gasoline have impacted site soil. Groundwater grab sampling performed in association with previous site investigation in 2004 (Versar) and 2007 (URS) confirmed that site groundwater has been impacted with petroleum hydrocarbons and related volatile organic compounds (VOCs). Current site features, along with locations associated with historical and current soil, soil vapor, and/or groundwater sampling events, are indicated in Figure 3. Approximately 90 percent of the surface at the site is paved, including the area around the former USTs and groundwater monitoring wells. The site has been graded to promote surface drainage into storm drain inlets. Catch basins collect rainwater and divert the runoff to the north through underground pipes into the adjacent airport storm water system. This system drains approximately 1.5 miles north of the site into Little John Creek, then into French Camp Slough, and finally into the San Joaquin River (Versar, 2004). OTI E