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• r� A E I November 20, 2024 ' r San Juaquin County Health Department Soil Boring Permit Application 1868 East Hazelton Avenue Stockton, California 95295 Re: Work Plan for a Limited Phase II Subsurface Investigation 2641 North Wilson Way Stockton, California 95205 To Whom it May Concern: AEI Consultants (AEI) has provided this work plan outlining the Limited Phase II Subsurface Investigation at 2641 North Wilson Way in Stockton, California 95205 (Site). The November 12, 2024 Draft Phase I Environmental Site Assessment (ESA) prepared by AEI identified former industrial use at the Site as a recognized environmental condition (REC). The purpose of this investigation is to evaluate whether the subsurface at the Site (i.e., soil or soil gas) has been significantly impacted by the REC identified in the Draft Phase I ESA. AEI's proposed fee, scope of work, assumptions, and schedule are provided below. AEI anticipates performing the following tasks as part of its investigation. • Prepare a work plan for submittal to San Joaquin County Environmental Health Department (SJCEHD). • Obtain a drilling permit for the proposed exploratory borings from the SJCEHD. • Prepare a Site-specific health and safety plan (HASP) for the project. • Notify the Client and site contact person with the nature and schedule of the work. • Mark the Site and drilling locations using white paint and notify DigAlert (811) who will contact subscribing utility companies to mark the locations of their underground utilities, on the Site, along Site boundaries, and near proposed investigation locations, as appropriate. Where utilities obstruct investigation locations, the locations will be changed accordingly, if possible. • Arrange for a private utility locating service to check planned drilling locations for possible utilities. Where potential obstructions are detected, the proposed drilling locations will be adjusted accordingly. • AEI will contract a licensed driller to advance four (4) soil borings at the Site with a track- or truck-mounted direct- push drilling rig depending upon access limitations. The locations of the proposed borings are shown in the attached figure but may be modified based on actual Site conditions. The extrerior boring and the 2 borings next to the former inground lifts will be advanced to the planned depth of 10 feet below ground surface (bgs), or to the depth of refusal, whichever is encountered first, for the collection of soil samples. The interior boring will be located next to the spray paint booth and will be advanced to the planned depth of 5 feet bgs, or to the depth of refusal, whichever is encountered first, for the collection of soil samples. • Each boring will be logged by AEI staff, soil core will be logged and described in general accordance with the Unified Soil Classification System; soils will be screened with a photoionization detector as well as sensory perception. Soil samples will be collected for laboratory analyses from the intervals that represent the highest likelihood for contamination based on the field screening results. If no contamination is evident, the soil samples will be collected at 1, 2.5, 5, and 10 feet bgs and one sample per boring will be selected for the analysis listed below. The remaining soil samples will be held at the laboratory. • Additionally, should field observations indicate contaminants in soils, AEI will collect additional soil samples to be placed on hold. Should the samples warrant analysis, AEI will contact the Client to discuss and prepare a change order for the sample analysis. • The soil borings will be completed as temporary soil gas probes between 4-to-5 feet bgs or refusal to collect soil gas samples. Sampling of soil gas will be conducted by vacuum testing and purging the probes and by using a tracer compound. The soil gas samples will be collected using laboratory supplied, 1-liter Summa°canisters each equipped with a calibrated flow controller. • Samples collected for potential laboratory analysis will be sealed, labeled, and entered onto chain-of-custody documentation for transportation for analysis to a state-certified laboratory. • The following types and number of soil analyses are included: Total Petroleum Hydrocarbons (TPH as gasoline (TPH-g), diesel (TPH-d), and oil (TPH-o) using EPA Testing Method 8015B..........................................................................4 samples. Client Initials: Date: