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Ranch Market -2 - 15 May 2018 23569 South Santa Fe Road Riverbank, San Joaquin County 2. In the Report, Condor states that the petroleum hydrocarbons detected in samples collected from MW-7 are the result of an unreported petroleum release from a suspected UST at the 23659 S. Santa Fe Road property, south (downgradient) of the Site. However, an evaluation of chromatograms from recent groundwater monitoring samples did not indicate that petroleum hydrocarbons detected in MW-7 came from a different release. Condor contends that the presence of petroleum hydrocarbons at greater concentrations in MW-7 than in MW-5 and anecdotal evidence of suspected former UST on the downgradient property sufficiently substantiate a second release. Due to the limited available data, Central Valley Water Board staff requests that you conduct additional investigation to confirm the second release. As the extent of petroleum hydrocarbons in groundwater downgradient of MW-7 remains undefined and soil assessment near the alleged downgradient former UST has not been completed, Central Valley Water Board staff requests that you conduct additional downgradient assessment of soil and groundwater. By 20 July 2018, please submit a Work Plan which proposes to collect shallow soil samples in the vicinity of the suspected downgradient former UST, and to assess groundwater in the vicinity of the suspected former UST and further downgradient from MW-7. 3. In the Report, Condor recommends destroying remaining remedial wells and MW-5D. While Central Valley Water Board staff does not concur with the destruction of MW-5D at this time, we do concur with the destruction of remaining Site remedial wells. In the Work Plan requested above, please include a proposal to destroy the remaining remedial wells. 4. Central Valley Water Board files contain incomplete well construction data for the domestic wells on and around the Site: DW-1 R, DW-2R, DW-3, DW-4. Please include well construction details for these wells in the Work Plan requested above. If complete construction details cannot be located, please include in the Work Plan a proposal to determine the construction of each of these wells. Please also include all historical groundwater sampling from these wells in the Work Plan. 5. Central Valley Water Board staff concurs with Condor's recommendation to reduce semi-annual groundwater sampling to include only wells MW-1, MW-3, MW-5, MW-7, and DW-3. The next groundwater sampling event should be performed during 3rd quarter 2018, with a Groundwater Monitoring Report (GMR) due by 30 October 2018. 6. Please be aware that reimbursement of project costs from the State Water Resources Control Board's Underground Storage Tank Cleanup Fund (Fund) is contingent upon compliance with regulatory agency directives. Failure to perform work in a timely manner may result in reimbursement delays. In summary, Central Valley Water Board staff request that you conduct the following: • By 20 July 2018, please submit a Work Plan which includes: o A proposal to destroy remaining Site remedial wells