FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

RAYMOND GREER • • Page 2 of 2 Does the site meet any of the Petroleum Vapor Intrusion to Indoor Air specific criteria scenarios? r YES C NO 2a-Scenario 1(example):Unweathered LNAPL in Groundwater-The bioattenuation zone is a continuous zone that provides a separation of at least 30 feat vertically between the LNAPL in groundwater and Me foundation of existing or potential buildings,and total TPH(TPHg and TPH-0 combined)are<100 C, YES 0 NO mglkg throughout the entire depth of the bioattenuation zone. 2a-Scenario 2(example):Unweathered LNAPL in Soil-The bioattenuation zone is a continuous zone that provides a separation of at least 30 feel both laterally and vertically between the LNAPL in soil and the foundation of existing or Potential buildings,and total TPH are<100 mg/kg throughout the entire C YES 9 NO depth of the bioattenuation zone. 2a-Scenario 3(example):Dissolved Phase Benzene Concentrations Only in Groundwater(Low concentration groundwater scenarios with or without 02 measurements must satisfy one i,it,or iii): 1.For bioattenuation zone without oxygen measurements or oxygen<4%and benzene concentration are<100 pg%,the bioattenuation zone:Is a 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 rA NO building;and contain total TPH<100 mg/kg throughout the entire depth of the bioattenuation zone. ii.For bioaftenuation zone without oxygen measurements or oxygen<4%and benzene concentration are>100 pgr-but<1,000 pgrL,the bioattenuation zone:Is a continuous zone that provides a separation of at least 10 feel vertically between the dissolved phase benzene and the foundation of existing or r YES IT NO potential building,and contain total TPH<100 mgfkg throughout the entire depth of the bioattenuation zone. iIi.For bioattenuation zone with oxygen z 4%and benzene concentration are 0,000 pg/L,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 r NO <100 mi throughout the entire depth of the bioattenuation zone. 2a-Scenario 4(example):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 cellected at least 5 feet below the bottom of the building foundation. (g YES O NO -Future construction:The soil gas sample shall be collected from at least 5 feet below the ground surface(bgs). Ft YES 4 NO I.Soil Gas Sampling Locations—with Bioaltenuation Zone:The criteria in Column A in the Soil Gas Criteria table(page 5 of the Policy)apply B the following requirements for a bioattenuation zone are satisfied: -Minrnum of 5 feet of soil between the soil vapor measurement and the foundation of an existing or ground surface of future construction r- YES @ NO -TPH(TPHg+TPI-d)is<100 mi(measured in at least two depths within the 5-fl zone) (' YES 6 NO -Oxygen is z 4%measured at the bottom of the 5-ft zone. r YES 9 NO 2b-Petroleum Vapor Intrusion to Indoor Air-A site-specific risk assessment for the vapor intrusion pathway has been prepared that demonstrates human r YES O NO health is prompted to the satisfaction of the regulatory agency. 2c-Petroleum Vapor Intrusion to Indoor Air-The regulatory agency has deteim ined petroleum vapors migrating from Soil or groundwater will have no significant risk of adversely affecting human health as a result of controlling exposure through the use of mligation measures or through the use of N YES O NO institutional or engineering controls. 3.Media Specific Criteria:Direct Contact and Outtloor Air Exposure-The site is considered/ow-threat for direct contact and outdoor air exposure if it meets 1,2,or 3 below.-CLEAR SECTION ANSMRS AdtlWonal Infomutlon Should this case be closed in spite of NOT meeting policy criteria? r YES r NO SPELL CHECK Save in Progress LOGGED IN AS HENDERSONN CONTACT GEOrM CKER HEL https:Hgeotracker.waterboards.ca.gov/regulators/screens/closure_policy.asp?global_id=T06... 7/2/2013