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Soil samples shall be retained at changes in lithology, zones of obvious hydrocarbon impact (screening with a photo-ionization detector) for laboratory analysis, and a description of soil stratigraphy (boring log according to ASTM D-2488-06 protocol) will be documented. One soil sample will be collected from the 0-5-feet bgs interval and one sample collected from the 5-10-feet bgs interval of each soil boring, for a total of fourteen (14) soil samples. These depths are selected per the LTCP Direct Contact and Outdoor Air Exposure criteria risk evaluation. Drilling and sampling equipment will be decontaminated before and after each use using Alconoxe (or equivalent) and a hot water pressure washer. Soil cuttings and decontamination rinsate will be stored in labeled Department of Transportation (DOT) approved 55-gallon drums or equivalent, pending evaluation of disposal options. Based on LTCP requirements and that the site had gasoline and diesel underground storage tanks and no waste oil or Bunker C Oil storage tanks the soil samples for chemical analysis will be submitted to a State certified laboratory under proper chain-of-custody procedure for the following analysis: Benzene, toluene, ethyl benzene, and total xylenes (BTEX), and naphthalene by EPA Test Method 8260B. After soil sampling activities are complete, the borehole will be properly abandoned in accordance with local (SJCEHD) regulations. Task 3 — Applying Soil Screening Levels The maximum concentration of petroleum constituents in soil shall be compared to those listed in Table 8 Summary of Soil Screening Levels for Different Exposure Scenarios and Receptors of the State Water Resource Control Board's March 2012 Technical Justification for Soil Screening Levels for Direct Contact and Outdoor Air Exposure Pathways (presented in Appendix B) as a reference for the subsequent assessment recommendations. Those soil screening levels have been designed to be taken into consideration together with Vapor Intrusion Criteria and Groundwater Criteria to aid in the determination of the site as a low-threat to human health from all exposure pathways. In order to complete and pass the LTCP both the 0 to 5 feet bgs concentration limits and the 5 to 10 feet bgs concentration limits for the appropriate site classification (residential and commercial/ industrial) will need to be satisfied. Additionally, if exposure to construction workers and/or utility trench workers is potentially or reasonably anticipated, the concentration limits for the utility worker will need to be satisfied. Task 4 — Letter Report The report of findings will include a description of the field activities performed, a discussion of the findings, tabulated data, an updated map from field measurements and/or survey, a map showing the sample locations, laboratory data reports, results of the soil screening level application, and conclusions with recommendations as appropriate for this site. 03009-10-017 Siebold 2