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Mr. Buehler February 9, 2024 Page 2 of 7 • January 2001 -Property was transferred from Janet Wisecarver to Philip and Irene Henry; • August 27, 2001 - Subsurface investigation performed by UEC was completed under a contract with Philip Henry; • January 2004-Property was transferred from Philip and Irene Henry to Carl McArthur, Jr.; • 2011 - 2015 - Investigation was completed under Department of General Services (DGS) contract with funding generated through the Emergency, Abandoned and Recalcitrant (EAR) account program as EAR Site No. R10-129; • November 2016-Begin Site funding by the OSCF, Project No. B 185; • October - November 2017 - Remedial activities presented in Apex's Feasibility Study and Interim Remedial Action Plan, dated May 20, 2013, were implemented, including installation of a trailer mounted soil vapor extraction (SVE) and air sparge (AS) remediation system. The SVE/AS system consists of a 20 horsepower (HP) Dekker Vacuum Technologies, Inc. Vmax liquid ring blower capable of 300 cubic feet per minute (cfm) at 29-inches of mercury, four 2,000-pound vapor-phase carbon vessels arranged in series, a 60-gallon moisture knock out tank with a high water level shut down sensor, NEMA-4 control panel equipped with safety sensors for automatic system shutdown, equipment cooling exhaust fan, and associated conveyance piping; • November 14, 2017 - Operation of the remediation system begins. After removing approximately 2,480.4 pounds of total contaminant mass, the remediation system was temporarily shut-off on August 31,2018, pending OSCF budget amendment approval. OSCF Budget approval was received on February 24, 2022, and an application for a permit to construct/operate and to replace the carbon vessels with an electric thermal oxidizer was submitted to the San Joaquin Valley Air Pollution Control District (SJVAPCD) on December 5, 2022. Approval was received on February 8, 2023; • April 27, 2023 - The thermal oxidizer began operating. The SVE/thermal oxidizer treatment system consists of a 10 HP Roots URAI 56 blower capable of 250 cfm at 14-inches of mercury, a moisture knock-out tank with a high-water level shut down sensor, control panel equipped with safety sensors for automatic system shutdown, and a platinum coated metal monolithic oxidizer with a 98.5%+destruction efficiency. The treatment system currently utilizes four vapor extraction wells (VW-1, VW-1 D, VW-2, and VW-2D). Vapor extraction wells VW-1 and VW-2 are screened from 30 to 60 feet below ground surface (bgs) and wells VW-1 D and VW-2D are screened from 60 to 80 feet bgs. The Site is also equipped with ten air sparging wells (AS-1 through AS-10), which are currently offline but scheduled for startup in May 2023. The layout of the treatment system and air sparge system are presented on Figure 2. Startup activities are presented in Citadel's Treatment System Startup Monitoring and Sampling Report submitted to RWQCB on May 12, 2023. Since startup, weekly Operation and Maintenance (O&M) Site visits have been conducted and remediation progress are presented in quarterly O&M Reports; and • December 6, 2023-A Joint Execution Team (JET) meeting was held to develop a scope of work for the grant amendment.This grant amendment proposed scope of work is needed to complete approved remedial activities at the Site and move towards closure in compliance with the RWQCB- Low-Threat Closure Policy (LTCP).