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' Surface and Subsurface Contamination Report Page 14 VELASQUEZ PROPERTY September 5,2008 1 WKA No.8237.01 Blue Star 4040 Main Street ' This facility is located approximately 300 to 400 feet southwest of the site, at the southwestern corner of the intersection of the site Oro Avenue and East Main Street. According to a 2007 Quarterly monitoring report for this facility, groundwater contamination from three removed ' USTs has migrated to just beyond the facility boundaries into Oro Avenue (Advanced, 2007), and therefore, does not appear to be a hazardous material threat to the site at this time. , Quik Stop#76 1030 South Olive Avenue This facility is located approximately 600 feet west of the site. According to a 2008 Quarterly ' monitoring report for this facility, groundwater contamination from two removed USTs does not appear to have migrated beyond the facility boundaries at this time (Horizon, 2008), and therefore, does not appear to be a hazardous material threat to the site at this time. ' 4.3.4 Preliminary Screen For Potential Vapor Intrusion Conditions WKA conducted a preliminary screening for potential vapor intrusion conditions (pVIC)beneath the site using a pVIC-screening matrix'. The matrix included performing a Search Distance Test ' to identify if there are any known or suspect contaminated facilities surrounding or upgradient of the site within specific search radii, a Chemicals of Concern (COC) Test(for those known or 1 suspect contaminated facilities identified within the Search Distance Test) to evaluate whether or not COC are likely to be present, and a Critical Distance Test to evaluate whether or not COC in a contaminated plume may be within the critical distance of the site(100 feet for non-petroleum hydrocarbon contaminants, and 30 feet for petroleum hydrocarbon contaminants). The Potential Vapor Intrusion Screening Matrix is included in Appendix G. Based on the completion of the pVIC-screening matrix, it is presumed likely that a pVIC ' 0 currently exists beneath the site. 1 The Preliminary Screen for Potential Vapor Intrusion Conditions was based on the guidelines presented in the ASTM E2600-08 Standard Practice for Assessment of Vapor Intrusion Into Structures on Property Involved in Real Estate Transactions.