FIELD DOCUMENTS FILE 3 - Laserfiche WebLink

Home Browse Search

"- � CHEVRON #94054 — Page 2 of 2 Nearest Surface water Body (From Plume Boundary) : r <- 250 Feel r > 250 Feel and s 1 ,000 Feet C Unknown • k 2. Media Specific Criteria: Petroleum Vapor Intrusion to Indoor Air- The site is considered /ow-threat for the vapor-intrusion-to-air pathway if site-specificconditions sa fisfyifems 2a, 2b, or 2c - cLEAR secTIGN ANstivi EXEMPTION - Active Commercial Petroleum Fueling Facility r YES C NO Does the site meet any of the Petroleum Vapor Intrusion to Indoor Air specific criteria scenarios? r YES r NO 2a - Scenario 1 fexamolel: Unweathered LNAPL in Groundwater - The bloaftenuation zone Is a continuous zone that provides a separation of at least 30 fast vertically between the LNAPL in groundwater and the foundation ofpsting or potential buildings, and total TPH (TPH-g and TPHA combined) are <100 r YES r NO mglkg throughout the entire depth of the bioatlenuation zone. 2a - Scenario 2exf�a r ple : Unweathered LNAPL in Soil - The bioatlenuation zone is a continuous zone that provides a separation of at least 30 feet both laterally and vertically between the LNAPL in soil and the (pprfdation of existing or potential buildings, and total TPH are <100 mg/kg throughout the entire r YES r NO depth of the bioatlenuation zone. V � 2a - Scenario 3 (examplel: Dissolved Phase Benzene Concentrations Only in Groundwater (Low concentration groundwater scenarios with orwithout 02 measurements must satisfy one i, ii, or III): I. Far bloaflenuation zone without oxygen measurements or oxygen <4% and benzene concentration are <100 uglL, the bioatlenuation 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 r YES r' NO building; and contain total TPH <100 mg/kg throughout the entire depth of the bioatlenuation zone. - IL For bioattenuation zone without oxygen measurements or oxygen <4% and benzene concentration are >100 pglL but <1,000 NgIL, the bioattenuation zone: Is a continuous zone that provides a separation of at least 10 feet vertically between the dlssotved phase benzene and the foundation of existing or r YES r NO potential building, and contain total TPH <100 mglkg throughout the entire depth of the bioattenuation zone. ii. For bioatlenuation zone with oxygen z 4% and benzene concentration are <1 000 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 did foundation of existing or potential building and contain total TPH r YES (7 NO <100 mglkg throughout the entire depth of the bioattenuation zone. 2a - Scenario 4 (exaam iy Direct Measurement of Soil Gas Concentrations 1. Soil Gas Sampling Locations — No BioaHenuation Zone: - Beneath or adjacent to an existing building: Soil gas sample is collected at least 5 feet 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). In YES r NO ii. Sell Gas Sampling Locations — with Bioattenuation Zone: The criteria in Column A in the Soil Gas Criteria table (page 5 of the Policy) apply if the 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. r YES r NO - TPH (TPHO + TPHd) is <1 00 mglkg (measured in at least two depths within the 5-ft zone) r YES r NO - Oxygen is z 40A measured at the bottom of the 5-ft zone. r YES r NO 2b - Petroleum Vapor Intrusion to Indoor Air - A saespecic 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 of 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 nsidered low-threat for direct contact and outdo or air exposure YES If it meei57, 2, or 3 below - CLEAR SECTION ANSWERS ( j. Additional Information Should this case be closed in spite of NOT meeting policy antenna? r YES - NO SPELL CHECK Save in Progress LOGGED IN AS HENOERSONN CONTACTGEOTRACKER HELP https://geotracker.waterboards.ca.gov/regulators/screens/closure_policy.asp?global_id=TO. . . 6/19/2013