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Revised Remedial Action Plan McBillin Real Estate Investment Properly 2154 South El Dorado Street,Stockton,Cali Cornia Page 3 January17. 2022—In a letter, the CVRWQCB requested a Revised Remedial Action Plan (RAP) by March 25,2022 (Attachment A). March 24, 2022—In and email, Apex requested to extend deadline for Revised RAP submittal to April 25, 2022. April 18, 2022—In an email, CVRWQCB staff granted deadline submittal of Revised RAP. April 20, 2022 —During a phone conversation, Apex and CVRWQCB staff agreed to extend the deadline for the submittal of the Revised RAP to April 29,2022. GENERAL SITE INFORMATION Site name McBillin Real Estate Investment Pro ert Site address 2154 South El Dorado Street, Stockton,California Responsible party Mr. Min Le McBillin Property. Current Site use Empty Lot Current phase of project Groundwater Monitoring/Remedial Assessment Tanks at site None Number of wells 13 monitoring wells (6 on-site, 7 off-site), 3 vapor extraction wells and 2 airs ar e wells PROJECT OVERVIEW The following section provides a summary of the relevant documents reviewed during the preparation of this Revised RAP. A review of the of the following Apex documents revealed that the soil and groundwater beneath the Site have been impacted by petroleum hydrocarbons and Apex has evaluated two (2)separate forms of potential remediation for the Site: • Second Semi-Annual 2019 Groundlpater Monitoring Report, and Pilot Test Results Report, Apex Envirotech, Inc., March 31,2020 • Dual-Phase Extraction Pilot Test Results Report,Apex Envirotech,Inc., April 16, 2021 November 7, 2019, Apex personnel began the remediation investigation phase of the project by performing an 8-hour SVE/AS pilot test at the Site. The SVE/AS test was performed to determine the feasibility of removing the contaminants of concern, which are TPHg and BTEX, from the subsurface the via specific methodologies. The test was performed on one well identified as vapor well(VW)VW-1 and one air sparge well IAS-1 (Figure 2). The 4-inch polyvinyl chloride (PVC) well utilized for the SVE component of the pilot test has a screen interval of 10 to 25 feet below ground surface(bgs). Based on flow rates and laboratory vapor sample results, the total extracted mass of TPHg and benzene were approximately 0.1 and 0.0 pounds,respectively,during the 8-hour test. Based o❑ this result,Apex