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Off-Site Groundwater Well Installation Work Plan McBillin Real Estate Investment Property 2154 South El Dorado Street Stockton,San Joaquin County,California Page 4 SITE-SPECIFIC HEALTH AND SAFETY PLAN Prior to the completion of any field work, a site-specific Health and Safety Plan (HASP) will be prepared and will be retained onsite during all field activities. All work will be conducted according to the HASP. The HASP will contain information on the properties of the hazardous materials known to be onsite. This information is equivalent to that contained within Safety Data Sheets (SDS) (formerly Material Safety Data Sheets). UTILITY CLEARANCE Apex will mark each area proposed for soil boring/monitoring well installation and monitoring well destruction with white marking paint and/or wood stakes and notify Underground Service Alert(811 North) a minimum of 72 hours prior to commencement of field activities to allow for the marking of buried utilities. In addition to this step, each boring location (including well installation) will have the top five (5) feet cleared through use of hand auger equipment. PERMITTING Upon receipt of written concurrence with this workplan from CVRWQCB staff, Apex will submit a completed permit package to the San Joaquin County Environmental Health Department(SJCEHD). Additional permits may be required to be issued for right-of-way entry/encroachment through the City of Stockton or a right-of-entry agreement with the City of Stockton Parks and Recreation Department. Depending on the final placement of the proposed groundwater monitoring wells, a traffic control plan is likely to be required as part of the submittal for any of the agreements/permits referenced above. If it is determined that a traffic control plan is indeed required, one will be obtained through an appropriately experienced and licensed professional prior to the submittal of the permitting packages. Subsequent to obtaining the permits, Apex staff will contact SJCEHD and any of the other permitting entities in accordance with permit conditions so that legal notices are provided and inspector(s)will have an opportunity to observe the construction and completion of the groundwater monitoring wells. Copies of well completion reports for all newly completed monitoring wells will be forwarded to SJCEHD and the State of California, Department of Water Resources to close out the permitting process. Monitoring Well Installation Based on the August 14, 2023 ECAP/JET meeting, Apex completed a review of the well installation/boring logs associated with the existing MW-12 which is installed within the Deep Zone (Figure 3) and completed a brief visual reconnaissance of the generally proposed monitoring well locations to ascertain the most viable locations (overhead conditions, traffic, obvious utility markings, and other constraints). A review of the MW-12 data found that it was drilled and installed by Gulf Shore Drilling on November 28, 2017 and overseen by AdvancedGeo Environmental. The total depth of the boring is listed as 125 feet below ground surface (bgs)with a screen interval of 110 feet to 125 feet bgs utilizing a two (2) inch diameter 0.010-inch slotted casing. The filter pack is