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APEX 11291 Pyrites Way, Suite B <br /> ENVIR0TECH , INC . Gold River, CA95670 <br /> www.apexenvirotech.com <br /> September 7, 2023 <br /> Mr. Alan M. Buehler <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive <br /> Rancho Cordova, California 95670 <br /> Subject: Off-Site Groundwater Well Installation Work Plan <br /> McBillin Real Estate Investment Property <br /> 2154 South El Dorado Street, Stockton, California <br /> Apex Project No. MBR52.001 <br /> Mr. Buehler: <br /> Apex Envirotech, Inc. (Apex) has been authorized by Mr. Min Le of McBillin Real Estate <br /> Investment (McBillin) to provide ongoing environmental services at the McBillin Real Estate <br /> Investment Property(herein after referred to as S ite). On August 14,2023,Apex staff participated in <br /> a conference call with Central Valley Regional Water Quality Control Board Staff(CVRWQCB) <br /> through the Expedited Claim Account Program (ECAP) Joint Execution Team (JET). Through the <br /> call, it was agreed that two (2) additional deep monitoring wells are needed to delineate the <br /> downgradient extent of the Site dissolved hydrocarbon plume. This Off-Site Groundwater Well <br /> Installation Workplan outlined below describes the proposed activities to address the required <br /> delineation. <br /> This report is based, in part, on information obtained by Apex from McBillin, and is subject to <br /> modification as newly acquired information may warrant. Apex Standard Operating Procedures, <br /> field data, and analytical results are provided as appendices. <br /> SITE DESCRIPTION <br /> The Site is located at 2154 South E1 Dorado Street, in Stockton, San Joaquin County, California <br /> (Figure 1). The Site is currently an empty lot that was a former gas station with five(5)underground <br /> storage tanks (USTs) that were removed on October 7, 2010. The current Site layout including <br /> monitoring wells (both on-site & off-site) is included as Figure 2. <br /> BACKGROUND <br /> March 5, 2014—Advanced GeoEnvironmental, Inc. (AGE) supervised the installation of monitoring <br /> wells MW-1 through MW-6. Field activities were detailed in AGE's Groundwater Monitoring <br /> Report, dated April 11, 2014. Subsequent to monitoring well installation, monitoring of the <br /> groundwater at the Site commenced. <br />