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Quik Stop Station No. 76 March 18,2009 <br /> Stockton,California Soil Gas Investigation Work Plan <br /> Human Health Screening Levels for Indoor Air and Soil Gas published by the 2 <br /> Office of Environmental Health Hazard Assessment (OEHHA, Cal EPA, ,r <br /> January 2005). <br /> Task 3 Compare the results of the soil gas analyses to Region 2 OEHHA values as <br /> presented in the California Human Health Screening Levels (CHHSLs, Cal <br /> EPA January. 2005) and, as appropriate, to the Environmental Screening <br /> Levels (ESLs)_listed in Screening For Environmental Concerns At Sites With !_- <br /> Contaminated Soil and Groundwater (February 2005). <br /> Task 4 Prepare a_report documenting the description of the soil gas investigation <br /> fieldwork; a site map showing the soil gas sampling points; a summary of <br /> analytical results;-comparisons to the appropriate screening levels; and an <br /> evaluation of the potential for soil gas to intrude into the station building and <br /> to complete the inhalation exposure pathway. <br /> If you have any questions, please contact Horizon at (916) 939-2170. SS�a�AL G'�O <br /> Sincerely, _ `CORD <br /> HORIZON ENVIRONMENTAL INC. �y <br /> * No. 530 <br /> P. 09 <br /> Gary D. Barker Rexford K. Smith, P.G. No, 5307 <br /> Senior Project Manager Project Manager <br /> Attachments <br /> SJCEHD Correspondence <br /> Figure 1: Site Vicinity Map <br /> Figure 2: Site Plan with.UST Soil Sample Map Locations <br /> Figure 3:. Site Plan with Proposed-Soil Gas Sampling Locations <br /> Table 1: Soil Analytical Data <br /> Table 2: Groundwater Analytical Data <br /> Horizon's Field Methods and Procedures <br /> cc: Mr. Mike Karvelot, Quik Stop Market <br /> Mr. James L.L. Barton, Regional Water Quality Control Board <br /> SCI W.P Mar09 <br /> Project No,7076.15 4 HORIZON ENVIRONMENTAL INC. <br />