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Bill Filios 4- 21 November 2017 screening levels. Due to the large quantity of data, the Discharger proposes to spot check the hard copy lab reports to verify the reporting limits. The Closure Work Plan includes spot checking 10%, 20%, 100% and an unknown percentage of the original data sets for the various operational areas. The Report of Findings needs to include the rational for the percentage of data that was spot checked. 5. General Chemical Analysis: The Discharger proposes to collect and analyze six soil and two groundwater samples for general chemical constituents including carbonates, bicarbonates, and nitrates in the operable unit 1 area to evaluate potential impacts from the septic tanks and leach lines. Other potential constituents of concern that need to be evaluated to assess the potential impacts from the septic tanks and leach lines include, but are not limited to: potassium, sodium, ammonium-nitrogen, organic-nitrogen, chloride, sulfate, phosphate. 6 Tetraethyl Lead Analysis: In areas where lead is present at concentrations above screening levels, the Discharger shall analyze samples for tetraethyl lead. The Report of Findings needs to include the tetraethyl lead sampling results and an evaluation of tetraethyl lead impacts on the Site. 7. Pesticides and Herbicides Analysis: The list of pesticides and herbicides the Discharger proposes to analyze soil and groundwater for was not included in the Closure Work Plan. The Report of Findings shall include a discussion detailing why the specific pesticides and herbicides were selected for analysis. Additionally, the Discharger shall include 1,2,3-trichloroproane (1,2,3-TCP) in the pesticides and herbicides analyses. The 1,2,3-TOP analyses shall be completed with low enough reporting limits to compare the concentrations to the California maximum contaminant level for 1,2,3-TOP of 5 nanograms per liter. Central Valley Water Board staff conditionally concur with the proposed investigation scope-of-work detailed in the Closure Work Plan as long as the comments listed above are appropriately addressed. As detailed above, this concurrence with the proposed investigation scope-of-work does not constitute Central Valley Water Board concurrence with the data evaluation and conclusions presented in the Closure Work Plan. Please notify staff of the field schedule at least one week in advance of the start of various field activities. A Report of Findings should be submitted to this office by 45 days after the completion of field work no later than 30 March 2018. All future reports submitted to the Central Valley Water Board shall also be uploaded onto GeoTracker. . If you have any questions regarding this letter please contact me at (916) 464-4682 or Am .Ha • waterboards.ca. ov. Amy Ha, P. Water Resources Control Engineer Private Sites Cleanup Unit cc: Linda Turkatte, San Joaquin County Environmental Health, 1868 E. Hazelton Ave. Stockton, CA 95205 Anthony Wohletz, Kleinflelder, 2882 Prospect Park, Sacramento, CA 95670