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C�eologicallerltnicslnc Page 11 <br /> Sinclair&Thompson Property <br /> Soil Gas Survey Report <br /> January 29,2007 <br /> i <br /> • All analyzed constituents, collected from the remaining..sample points, were non-detect <br /> and/or significantly below ESLs.: <br /> * SG-3, -4, and' -5- are the closest sample locations to the house and all analyzed <br /> constituents from these sample points were non-detect and/or significantly below <br /> g y E SLs. <br /> • Quality control sample (Probe Blank) was non-detect above laboratory reporting limits <br /> for all analyzed constituents. <br /> • Quality control sample:(SG-1 Duplicate) confirmed the_concentrations detected in SG-1 <br /> were accurate. <br /> • Quality control compounds (leak check) were non-detect above laboratory reporting <br /> limits. <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 <br /> ESLs. <br /> o SG-1 was advanced into a small zone of'residual contamination located more than <br /> 50 feet from the dwelling. <br /> o SG-2 and SG-6 show that.SG-1;°is an isolated area that will not likely impact the <br /> dwelling or future use of the Property. <br /> o The excavation has effectively removed the bulk of the soil contamination,from <br /> the Property. <br /> 9:4 REFERENCES <br /> Cal/EPA. 1994. Preliminary Endangerment Assessment Guidance Manual. State of <br /> California, Environmental Protection. Agency, Department of Toxic ,Substances <br /> Control. January 1994. <br /> Cal/EPA. 2003: Advisory. ry — Active Soli Gas Investigations. California Environmental <br /> Protection Agency, Department of Toxic Substances Control. January 28, 2003. <br /> 1RW <br /> ,C QCB-SFB. 2005. Screening for Environmental Concerns at Sites with Contaminated <br /> Soil and Groundwater, Volume 1: Summary. Tier. 1 Lookup Tables. California <br /> Regional Water Quality Control Board =-San Francisco Bay Region. Interim Final — <br /> February 2005. <br /> USDA/SCS. 1992.. Soil Survey of San Joaquin County, California. United States <br /> Department of Agriculture— Soil Conservation Service. October 1992. <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 /> - 'I <br />