SITE INFORMATION AND CORRESPONDENCE

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J&L Market • - 5 - • 8 May 2013 8125 S. EI Dorado St., French Camp San Joaquin County 0 to 5 feet bgs protect from ingestion of soil, dermal contact with soil, and inhalation of volatile soil emissions and inhalation of particulate emissions. The 5 to 10 feet bgs concentration limits protect from inhalation of volatile soil emissions. Both the 0 to 5 feet bgs concentration limits and the 5 to 10 feet bgs concentration limits for the appropriate site classification (Residential or Commercial/Industrial) shall be satisfied. In addition, if exposure to construction workers or utility trench workers are reasonably anticipated, the concentration limits for Utility Worker shall also be satisfied The soil contamination that exceeds the LTCP (>100 mg/kg) is between 12.5' bgs and 20' bgs, which is below typical worker depths. The Regional Board staff closure recommendation was also made by review of the site specific data and professional judgment prior to implementation of the LTCP Summary and Recommendations J&L Market has complied with all of the requirements in Regional Board Technical 13267 Order and staff letters. Concentrations of petroleum hydrocarbons in groundwater decreased significantly since 1995. The groundwater plume is stable and concentrations are slowly to very slowly declining. Water quality goals should be reached by 2030. The identified domestic and public supply wells are not threatened. Residual soil contamination poses minimal risk to sensitive receptors, human health, or other beneficial uses of groundwater in the area. Based on the minimal residual contamination in soil, minimal threats from vapor intrusion or groundwater plume migration, a stable and declining groundwater plume, compliance with the tasks of the Regional Board 13267 Order and directives and the LTCP, and an adequately defined vertical and lateral extent of pollution, no further action is warranted for the Site. Staff recommends closure of this Site. The required public participation comment period was conducted from 23 July 2012 to 10 September 2012 with no adverse comments. The monitoring wells (JLM3 through JLM5, and JLM12 through JLM26) and remediation wells (OSI and OS2) were properly destroyed on 8 May 2013. The Responsible Party and the San Joaquin County Environmental Health Department concur with case closure. Attachments: Figure 1: General Site Location Map Figure 2: Site Plan with borings, confirmation sample locations, and 3 wells Figure 3: Site Plan with CPT borings, monitoring and remediation wells Figure 4: 2,000' Radius Map of Sensitive Receptors Figure 5: 500' Radius Map of Sensitive Receptors Table 3: List of 500' radius Sensitive Receptors Figure 6: Geologic Cross Section A-A' Figure 7: Geologic Cross Section B-B' Figure 8: Geologic Cross Section C-C' Figure 9: Shallow Groundwater Isoconcentration Contours Figure 10: Intermediate Groundwater Isoconcentration Contours Figure 11: Deep Groundwater Isoconcentration Contours Figure 12: Data with Graphs of Estimated Times to Reach WQGs Figure 13: Plume Map March 2012