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i <br /> GeologicalTecltXicsl�rc. Page 7 <br /> Sinclair&Thompson Property <br /> Additional Soil Gas Survey Report. <br /> June 18,2007 <br /> t <br /> The Site should be considered for"No Further Action". <br /> o All sample points near the dwelling are non-detect and/or significantly below ESLs. <br /> o The additional soil gas investigation indicates all constituents are non-detect and/or <br /> significantly below ESLs near the former shop. <br /> o The excavation has effectively removed the bulk of the soil contamination from the <br /> Property. <br /> 8.0 REFERENCES <br /> Cal/EPA. 1994. ' Preliminary Endangerment Assessment Guidance Manual. State of <br /> California, Environmental Protection Agency; Department of Toxic Substances Control. <br /> January 1994. <br /> Cal/EPA. 2003. Advisory Active, Soil Gas Investigations: California Environmental <br /> Protection Agency, Department of Toxic Substances Control. January.28, 2003. <br /> CRWQCB-SFB. 2005. Screening for Environmental Concerns at Sites with Contaminated <br /> Soil and Groundwater,- Volume 1: Summary Tier 1 Lookup Tables, California Regional <br /> Water Quality Control Board -- San Francisco Bay. Region. Interim Final — February <br /> ` 2005. <br /> US/EPA. 1997. Expedited Site.Assessment Tools for Underground Storage Tank Sites: A <br /> Guide for Regulators (EPA 510-B-97-001). United States Environmental Protection <br /> Agency. March 1997. <br /> 9.0 LIMITATIONS <br /> This report was prepared in accordance with the generally accepted standard of care and <br /> practice in-effect at the time Services were rendered. It should be recognized that definition <br /> and evaluation of environmental conditions is an inexactscience and that the state or.practice <br /> of environmental geology/hydrology is changing and evolving and that standards existing at <br /> the present time may change as knowledge increases and the state of the practice continues to <br /> improve..� Further, that.differing subsurface soil characteristics can be experienced within a' small distance and therefore cannot be known in an absolute sense. All conclusions and <br /> recommendations are based on the available data and information. <br /> The tasks proposed and completed during this project were reviewed and approved by the <br /> local regulatory agency for compliance with the law_ No warranty, expressed or implied, is <br /> made. <br />