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Project No. 034-21033 Page No. 4 workplan that includes a site map showing the proposed soil boring locations, and access agreement with the property owner. Note: Since the depth of the soil vapor boring is less than 10 feet below ground surface, no C-57 license is necessary for hand auguring. General Field Activities Soil Vapor Sampling • Four (4) soil vapor borings will be advanced to a depth of 5.5 feet bgs utilizing a truck -mounted drill rig or hand auger along the east and south property boundaries, as shown on Figure 1. • The soil vapor wells will be sampled using field procedures consistent with the Advisory — Active Soil Gas Investigations published in July 2015 by the DTSC and the Los Angeles and San Francisco Regional Water Quality Control Boards. • Soil vapor samples will be collected in laboratory -grade containers. The samples will be labeled and identified on a chain of custody form and transferred to a State -approved analytical laboratory under chain -of -custody protocol. • Soil vapor samples will be analyzed for TCE and its degradation products by EPA Method TO - 15. Post -Field Activities • The soil vapor probs will be decommissioned by removing he tubing and capping the surface with asphalt patch. • Soil cuttings or investigation derived waste (IDW) may be placed in drums with temporary storage on-site. Krazan can assist in the disposal of the IDW. • Following completion of the field and laboratory investigation activities, we will prepare a report. The report will summarize the investigation methodology and will present the results of the chemical analysis of the soil vapor samples. If contaminants are encountered, we will identify the contaminants and will include a comparison of the contaminant levels to State or Federal regulatory screening levels. In addition to presenting our findings, the report will also include our conclusions and recommendations, based on the results of the laboratory analyses, that we deem prudent for further assessment, if warranted. The laboratory analytical reports for the soil vapor sample analyses will be appended to the report. SCHEDULE Once the soil boring permit is obtained, Krazan will schedule and begin the field activities within approximately five (5) to 10 business days, depending on availability of the driller. We anticipate that the site assessment activities including completion of the soil vapor borings/soil vapor sampling activities would be completed within five (5) business days. KRAZAN & ASSOCIATES, INC. With Offices Serving the Western United States 034-21033 WP for LSA Ripon.doc