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Port of Stockton - RRI - 2 - September 26, 2017 3. Building 16 Former USTs meet all eight General Criteria and all three of the Media- Specific Criteria of the LTCP_ While the Leaking Underground Fuel Tank (LUFT) manual lists naphthalene as a COC for gasoline, it is more commonly associated with higher carbon chained fuels such as diesel. A review of the site-specific data for the USTs removed at Building 16 shows no detections for diesel range organics in groundwater therefore sampling for naphthalene will not be required. The Building 16 Former USTs are eligible for a no further action status under the LTCP; 4. Site 48: Building 8707 UST and UST 916B meet all eight General Criteria and all three Media-Specific Criteria of the LTCP and therefore are eligible for a no further action status under the LTCP; 5. UST 605 meets all eight General Criteria and two of the Media-Specific Criteria of the LTCP. Media-Specific Criteria 3 — Direct Contact and Outdoor Air Exposure could not be evaluated for naphthalene due to no soil sampling data for this COC. To complete the LTCP analysis and determine if UST 605 is eligible for a no further action status under the LTCP, a soil boring will be required. This boring should be located adjacent to the previously highest area of detections (Soil Borings B-2 and 60502) and include the depths below ground surface (bgs) with the highest previous detections (13 and 16 feet bgs); 6. UST 517 meets all eight General Criteria and two of the Media-Specific Criteria of the LTCP. Media-Specific Criteria 3 — Direct Contact and Outdoor Air Exposure could not be evaluated for naphthalene due to no soil sampling data for this COC. To complete the LTCP analysis and determine if UST 517 is eligible for a no further action status under the LTCP, a soil boring will be required. This boring should be located adjacent to the previously highest area of detections (Soil Boring 517-3) and include the depths below ground surface with the highest previous detections (6 feet bgs); 7. UST 817B meets all eight General Criteria and two of the Media-Specific Criteria of the LTCP. Benzene concentrations in soil borings 817-D5 and 817-D7 exceed the Media- Specific Criteria 3 — Direct Contact and Outdoor Air Exposure screening levels for direct contact to Commercial/Industrial Workers of 8.2 milligrams per kilograms (mg/kg) and 14 mg/kg for Utility Workers. To determine if UST 817B is eligible for a no further action status under the LTCP, confirmation soil borings will be required. These borings should be located adjacent to the previously highest area of detections (Soil Borings 817-D5 and 817-D7) and include the depth below ground surface with the highest previous detections (4 feet bgs); 8. Central Valley Water Board staff recommends the Port of Stockton submit a detailed LTCP analysis for the following USTs so that a no further action status can be formally approved: Building 410A OWS; Building 16 former USTs; Site 48: Building B707 UST and UST 916B. The LTCP analysis should be submitted by December 26, 2017. 9. Central Valley Water Board staff requires the Port of Stockton to submit a work plan to address the above detailed data gaps for the following UST sites: UST 605, UST 517, and UST 817B. The work plan must be submitted by November 27, 2017.