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J&L Market - 2 of 3 - 09 November 2023 NFA Internal Justification Site. During the site visit, Central Valley Water Board staff documented cracks in the concrete secondary containment and noted soil with a petroleum odor at the southwest corner of the containment structure. On 21 November 2022, Central Valley Water Board staff requested a work plan to investigate potential diesel contamination at the Site. J&L Market submitted the 30 December 2022 Soil Assessment Workplan (ATLAS, 2022) in response to the Central Valley Water Board staff request. Central Valley Water Board staff concurred with the Workplan via a letter dated 24 January 2023. Setting: The Site is currently an active gas station at 8115 South El Dorado Street in French Camp (Figures 1 & 2). The Site is located in a mixed-use area, with residential, commercial, and agricultural properties located nearby. Geology and Hydrogeology: Soils encountered at the Site during the investigation primarily consisted of silty sand, with clayey silt encountered at approximately 9 feet bgs in boring B2. Groundwater was not encountered or investigated during the 2023 activities, but data from a closed underground storage tank case at the Site provided information on the hydrogeology of the area. Depth to groundwater historically ranged from 20.61 feet bgs to 30.63 feet bgs, and groundwater flow direction varied from southeast to northeast. Source: The AST was the source of potential contamination at the Site. J&L Market has submitted a Scope of Work to SJCEHD to line the diesel AST and increase the capacity of the secondary containment structure to 10,000 gallons. The work will be completed before the AST is put back in service. Actions: On behalf of J&L Market, Atlas Environmental Engineering, Inc. (ATLAS) completed investigation work to assess the potential presence of diesel contamination in shallow soil near the AST. On 30 March 2023, ATLAS advanced three soil borings at the Site and collected six soil samples (Figure 2). The soil borings were advanced using direct push technology to approximately 10 feet below ground surface (bgs). One boring was located on each of the east, south, and north sides of the AST. ATLAS collected soil samples from each boring at 5 feet bgs and 10 feet bgs, field screened the samples using an organic vapor analyzer, and submitted the samples to a California state- certified laboratory for analysis. All soil samples were analyzed by the laboratory for total petroleum hydrocarbons as diesel (TPHd) using Environmental Protection Agency (EPA) Method 8015M and volatile organic compounds (VOCs) using EPA Method 8260B. TPHd and VOCs were