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V, XON#7-3942 Page 2 of 2 continuous zone that provides a separation of at least 5 feel vertically between the dissolved phase benzene and the foundation of existing or potential f YES r NO building:and contain total TPH<100 mgft throughout the entire depth of the bioattenuation zone. ii.For bioattenuation zone without oxygen measurements or oxygen<4%and benzene concentration are>100 pi but<1,000 pglL,the bioattenuation zone:Is a continuous zone that provides a separation of at least 10 feet vertically between the dissolved phase benzene and the foundation of existing or r YES f NO potential building,and contain total TPH<100 mglkg throughout the entire depth of the bioattenuation zone. iii.For bioattenuation zone with oxygen z 4%and benzene concentration are<1,000 pg1,the bioattenuation zone:Is a continuous zone that provides a separation of at least 5 feet vertically between the dissolved phase benzene and the foundation of existing or potential building,and contain total TPH r YES C NO <100 mglkg throughout the entire depth of the bioattenuation zone. 2a-Scenario 4 fexa pllg]:Direct Measurement of Soil Gas Concentrations L Soil Gas Sampling Locations—No Bioattenuation Zone: -Beneath or adjacent to an existing building:Soil gas sample is collected al least 5 feel below the bottom of the building foundation. r YES r NO -Future construction:The soil gas sample shall be collected from at least 5 feet below the ground surface(bgs). r YES r NO ii.Sal Gas Sampling Locations—with Bioattenuation Zone:The criteria in Column A in the Soil Gas Criteria table(page 5 of the Policy)apply M the O following requirements for a bioattenuation zone are satisfied -Minimum of 5 feet of soil between the soil vapor measurement and the foundation of an existing or ground surface of future construction. rrYES r INC -TPH(TPHg*TPHd)is<100 mglkg(measured in at least two depths within the 5-fl zone) //YES r NO -Oxygen is z 4%measured at the bottom of the 5-R zone. r YES r NO 2b-Petroleum Vapor Intrusion to Indoor Air-A site-spec risk assessment for the vapor intrusion pathway has been prepared that demonstrates human r YES r NO health is protected to the satisfaction of the regulatory agency. 2c-Petroleum Vapor Intrusion to Indoor Air-The regulatory agency has determined petroleum vapors migrating from soil or groundwater will have no significant risk of adversely affecting human health as a result a controlling exposure through the use of mitigation measures or through the use of r YES r NO institutional or engineering controls. 3.Media Specific Criteria:Direct Contact and Outdoor Air Exposure-The site is considered low-fhreat for direct contact and outdoor airexposurs, YES dIt meets 1,2,or 3 below.-CLEAR SECTION ANSMRS Does the site meet any of he Direct Contact and Outdoor Air Exposure cdtede scenarios? R YES r NO 3.1-Maximum concentrations of petroleum constituents in soil are less than or equal to those listed in the following table(LINK I for the specked depth Or YES r NO below ground surface. Additional InWmutlon __ _ Should this case be closed in spite of NOT meeting policy criteria? r YES #/No Save in Progress LOGGED IN AS HENDERSONN CONTACT GEOTRACxER HELP https://geotracker.waterboards.ca.gov/regulators/screens/closure—Policy.asp?global_id=TO... 6/27/2013