2.1 INDOOR SOURCE INSPECTION Los Angeles Region 320 West 4th Street, Suite 200 Vapor Intrusion Guidance Documents. Soil Gas Guidelines - California Advisory – Active Soil Gas Investigations, Section 3.2. The air in those pockets is called soil gas. Table 1-1 35 FOSET #2 NFA Sites EN0811161139SCO CH2M 6 Hutton Centre Drive Suite 700 Santa Ana, CA 92707 O +1 714 429 2000 F +1 714 429 2050 www.ch2m.com Mr. Paul Cho . Indoor Air Sampling - New Regulatory Push for More Testing ... A total of 10 soil gas probes were advanced at the northeast portion of the … Advisory - Active Soil Gas Investigations. Phase II Environmental Site Assessment Report . It does not sampling was performed in general accordance with the Advisory – Active Soil Gas Investigations, July 2015, issued by the California Department of Toxic Substances Control (DTSC), and Los Angeles and San Francisco Regional Water Quality Control Boards. Regional Water Quality Control Board . The following was completed during this Investigation: DTSC Guidance Updates •Guidance documents revised –Preliminary Endangerment Assessment Manual –DTSC J&E Model (December 2014) –Active Soil Gas Advisory (July 2015) Revision in process… –Updated Vapor Intrusion Guidance –Petroleum Risk Assessment Guidance 27 The soil was Additionally, the site-specific Health and Safety Plan will be updated as appropriate to identify and mitigate potential hazards and measures associated with the vapor probe installations and vapor sampling. Equipment blank testing of tubing is explained in Question 3. iv. Reduction of Groundwater Monitoring Frequency to Semi-annual. Substances Control (DTSC) Advisory Active Soil Gas Investigations– dated July 2015 (DTSC Active Soil Gas Investigation Advisory), or any subsequent applicable Advisory • Probes shall be sampled a minimum of once, two (2) to forty-eight (48) hours after installation, depending on installation methods in accordance with the DTSC Active Soil Gas Investigation Advisory • … Requirements for Subsurface Soil Investigations, (RWQCB, 2000b). The document was reviewed by other government organizations and the regulated community. 2015. The soil gas monitoring well casings were constructed with ¼-inch-diameter Teflon tubing equipped with a filter at the base of the tubing. 2.1 INDOOR SOURCE INSPECTION Department of Toxic Substances Control (DTSC) issued several guidance and advisory documents between 2010 and 2015 for conducting SVI assessments and soil gas investigations that may require further revision to comport with the recently published EPA guidance (DTSC 2010, 2011, 2012a; DTSC/RWQCB 2015). Advisory – Active Soil Gas Investigations March 2013 sampling syringes, and pressure gauges. Soil Gas Sampling On October 28, 2019, a supplemental soil gas survey was performed at the Site to evaluate subsurface conditions for the presence of VOCs in soil gas. Control Board have jointly developed the Advisory –Active Soil Gas Investigations. Advisory – Active Soil Gas Investigations (July 2015). This advisory may be used to supplement remedies for sites with multiple contaminants in soil gas, e.g., hydrogen sulfide or volatile organic compounds (VOCs), in addition to methane. DTSC Soil Gas Guidance Changes (Updated Summer 2015) • Site Assessment Changes – Keep drilling deeper until vapors are non-detect – Deeper soil gas samples required if deeper source – Large volume sub-slab sampling • Purge Volume Changes – No more purge volume test – 3 PVs ok YEA!!! February 18, 2015 and were completed on June 26, 2015. VAPOR INTRUSION MITIGATION ADVISORY October 2011 i Revision 1 FOREWORD The California Department of Toxic Substances Control (DTSC) is issuing this Vapor Intrusion Mitigation Advisory (VIMA or Advisory) for use on sites that may be impacted by soil vapor intrusion into indoor air. She oversees environmental site assessments and subsequent site investigations including soil, groundwater, and soil gas investigations. Get it while its hot! The July 2015 version also supersedes previous versions produced in 2003 and 1997. the DTSC Vapor Intrusion Mitigation Advisory [2011b], and the SF Bay Regional Water Board Interim Framework [2014]). Advisory – Active Soil Gas Investigations, dated July 2015 (the “Soil Gas Advisory”; DTSC and RWQCB, 2015). methods for soil vapor sampling. The draft guidance on vapor intrusion released recently by a group of California environmental agencies should help address confusion resulting from varying approaches to … 2015. DTSC. Her design experience includes groundwater wells and wellhead treatment facilities, soil vapor extraction systems, storm water, Toxic Substances Control’s (DTSC) Advisory – Active Soil Gas Investigations (Advisory) document dated July 2015 guidelines. Vapor Intrusion Guidance Documents. In accordance with the DTSC guidance documents, 1 DTSC 2015 Advisory for Active Soil Gas Investigations, July In May 2015, a version of HHRA Note 3 was released incorporating review of the May 2014 through January 2015 releases of the RSL tables for soil, tap water, and air. advisory of 0.4 mg/L in drinking water for a 10-kilogram child and a lifetime health advisory of 0.2 mg/L in drinking water (EPA 2012). "Jointly revised by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Regional Water Quality Control Board, this updated Advisory provides technically consistent approaches for collecting and analyzing soil gas samples. July 2015. DUBLIN, Calif. - July 30, 2019 - PRLog-- Lennar is excited … This Cal EPA Advisory was jointly revised and updated July 2015 by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Regional Water Quality Control Board. The following was completed during this Investigation: 5. The EPA Action Level. Project Advisory Committee Update October 30, 2015 This is the latest update from PG&E’s Hunters Point Team to the Project Advisory Committee (PAC) and ... and upcoming PG&E activities on and around the Hunters Point site (Site). Vapor intrusion occurs when a chemical like PCE, which evaporates quickly, mixes with soil gas, rises and enters a building through utility lines (sewer or plumbing), cracks in a foundation (such as a concrete sub-slab), a basement floor, or other openings. Advisory, Active Soil Gas Investigations. TCE Comparison - … This measurement describes how much radioactivity from radon is in one liter of the air found in a home. Due to recent developments in the field of soil gas collection, the 2012 version of the Advisory was revised in July 2015. The Supplemental Guidance incorporates, by reference, the sampling methods described in CalEPA’s 2015 Active Soil Gas Investigations Advisory but makes specific recommendations for where and when sampling should occur. Updating the IUR also created revised recommended residential and commercial/industrial ambient air and soil gas screening levels (SL) for PCE. This document attempts to ensure that high quality data used for regulatory decision making are collected during active soil gas investigations using consistent methodologies. Flow Diagram of DTSC Vapor Intrusion Documents. The Advisory is not a regulation, instead it provides technical framework and reference for addressing soil gas sample collection and analysis. Guidance, the 2011 DTSC Vapor Intrusion Mitigation Advisory and the 2015 EPA Technical In accordance with the Advisory (DTSC, 2015), field duplicate soil vapor samples were collected at a minimum frequency of 1 per every 20 soil vapor samples collected. Department of Toxic Substances Control (DTSC). Final Treasure Island Restoration Advisory Board Meeting Minutes, 10 March 2020 Page 6 of 7 ADAN-6004-0000-0033 New Business—Citizen’s Advisory Board (CAB) Update Becky Hogue (RAB member) and Mr. Brennan are also members of the CAB, which is an advisory board to TIDA. Soil Vapor Survey The soil vapor survey was conducted in accordance with the July 2015 Advisory Active Soil Gas Investigations issued by the Regional Water Quality Control Board (RWQCB) and Department of Toxic Substances Control (DTSC) (the 2015 Advisory). Temporary soil vapor probes were constructed with a polyethylene implant attached to ¼-inch CalEPA, 2017. ... Did you see the new DTSC advisory for active soil gas investigations? Jones Environmental ‏ @jones_env 18 Aug 2015. Appendix E: Advisory Active Soil Gas Investigations (DTSC, 2012) Blaser Office SAP v FEBRUARY 26, 2015 ... 2015 1.0 INTRODUCTION The Inhalation Pathway Interim Measure (IPIM) ... for soil gas sampling (DTSC, 2012). This Kia was not quite like our @picarro research truck but it … Construction of soil gas probes began byadvancing a borehole to approximately 5.5 feet bgs. Under the oversight of the Regional Board, ExxonMobil is investigating soil, soil gas and groundwater impacts at the site, and has started the cleanup process. Alan Enterprise LLC. advisory – active soil gas investigations As a coordinated effort, this document is issued by the California Regional Water Quality Control Board – Los Angeles Region (LARWQCB) and Department of Toxic Substances Control (DTSC) as an Advisory subject to Since May 2015, DTSC is now providing regular updates to the DTSC-SLs, tracking the twice-yearl of HHRA Note 3, and an additional update released 14 July 2014. Additionally, USEPA continues to use the framework set forth in its 2015 Technical The soil gas sampling activities will be conducted in accordance with the attached procedures which incorporate the July 2015 - Active Soil Gas Investigations. EPA eyes health advisory revamp for key ‘forever chemicals’ “EPA has asked agency advisers to reassess the health effects of the two most notorious “forever chemicals,” a move that could translate into stronger regulations. The soil-to-groundwater risk-based SSL is 9.4 x 10-5 mg/kg (EPA 2017b). Big Difference in SS, but not SG. source and move into the surrounding soil pore spaces as soil gas. sampling locations and depths for soil gas plume investigation as well as methods for improving sampling plans for current and future buildings. Laboratory Requirements for Soil and Water Sample Analyses (RWQCB, 2001a). A duplicate soil vapor sample was collected at SVM-19 at the 5-foot depth. EPA and the U.S. The soil gas survey was performed in conformance with the California Environmental Protection Agency – Department of Toxic Substances Control (DTSC) and California Regional Water Quality Control Board – Los Angeles and San Francisco Region’s (LARWQCB and SFRWQCB) Advisory – Active Soil Gas Investigations, July 2015. June 2015 Restoration Advisory Board Meeting ... Sep 2015 – Soil Pad Processing Complete Nov 2015 – Waste Disposal Complete. Evaluate vapor intrusion using soil gas data. A duplicate soil vapor sample was collected at SVM-19 at the 5-foot depth. All probes were placed at the desired Begin Response Plan development for DTSC approval 2020 Phased site remediation begins Early Activation Project construction ... 2015 FINDINGS Feasibility study needed to address human health risks ... access soils and soil gas at depth to collect samples for laboratory analysis Test Pits: uncovers potential buried The Advisory is not a regulation, instead it provides technical framework and reference for addressing soil gas sample collection and analysis. These numbers were mainly applicable during the years 2005 to about 2015. The soil gas probes will be left in place to allow for potential additional sampling events in the future. conducted to evaluate for potential volatile organic compound (VOC) within an occupied building. Soil Gas Data Gaps Sampling and Sites 21 and. The Advisory is not a regulation, instead it provides technical framework and reference for addressing soil gas sample collection and analysis. Due to recent developments in the field of soil gas collection, the 2012 version of the Advisory was revised in July 2015. To evaluate the four soil-gas assessments revealed by Method 1, we used 10 representativeness questions (RepQ) based on US EPA DQA standards and California DTSC soil-gas “requirements” (see Section 3.1; see the authors’ Table 2). Los General Provisions June 12, 2020 Limited Phase II Environmental Investigation Report 2000 University Avenue and 2001 Milvia Street, Berkeley, California Terraphase Engineering Inc. This updated Advisory provides technically consistent approaches and best practices for collecting and analyzing soil … EPA has calculated a residential soil screening level (SSL) of 5.3 milligrams per kilogram (mg/kg) and an industrial SSL of 24 mg/kg. The Advisory – Active Soil Gas Investigations (ASGI or Advisory) provides technically defensible and consistent approaches for collecting and analyzing soil gas samples. Final Treasure Island Restoration Advisory Board Meeting Minutes, 21 June 2016 Page 3 of 10 TRIE-2205-0058-0240 dechlorination, reduced the … In fact, the OEHHA now recommends using HHRA Note 3 (DTSC HERO) for Phase 2 Environmental screening level numbers. DTSC determined that soil excavations and off-site soil disposal to address the areas of greatest PCE contamination, as proposed in the Response Plan, are complete. –https://www.dtsc.ca.gov/SiteCleanup/Vapor_Intrusion.cfm • July 2015 EPA published a guidance document. California Human Health Screening Levels (CHHSLs) are concentrations of chemicals in soil or soil-gas below thresholds of concern for risks to human health—specifically, an excess lifetime cancer risk of one-in-a-million (10 -6) and a hazard quotient of 1.0 for non-cancer health effects. The installation and sampling of the soil gas monitoring wells were performed in accordance with the Department of Toxic Substances Control (DTSC) Final Advisory Active Soil Gas Investigations (July 2015). A vapor extraction system was operated to remove In California, the Department of Toxic Substances Control (DTSC) issued several guidance and advisory documents between 2010 and 2015 for conducting SVI assessments and soil gas investigations that may require further revision to comport with the recently published EPA guidance (DTSC 2010, 2011, 2012a; DTSC/RWQCB 2015). The California Department of Toxic Substances Control (DTSC) is currently carrying out the Community Protection and Hazardous Waste Reduction Initiative (Haz-Waste Reduction Initiative), directed and funded for two years by a budget action approved in 2015. Probes shall be sampled a minimum of once, 2- to 48hours after installation-depending on installation methods in accordance with the DTSC Active Soil Gas Investigation Advisory. vacuum will be recorded on the labels. The soil gas survey generally complied with the DTSC/California Regional Water Quality Control Board (RWQCB) - Los Angeles Region “Advisory - Active Soil Gas Investigations” guidance, dated April 2012 and the soil sampling conformed to current environmental industry standards. Make sure all connections are snug, but do not over tighten fittings. The Advisory is not a regulation. Advisory Active Soil Gas Investigations , Cal EPA, DTSC, LA Regional Water Quality Control Board, San Francisco Regional Water Quality Board, https://dtsc.ca.gov/wp- Page 5 … This purge volume test determined how many purges of the soil gas The July 2015 version also supersedes previous versions produced in 2003 and 1997. Advisory Active Soil Gas Investigations, January 28, 2003 and – July 2015. Methane and pressure shall be recorded for each sample location … As shown on this plate, soil vapor samples will initially be collected beneath each of 10 proposed townhome buildings, and based on the sample results, additional soil vapor samples may be collected from the pre-selected step-out locations to further characterize 1 DTSC, 2015. Cape Technologies, 2009. Radon levels are measured in picocuries ("pee-co-cure-ees") per liter of air, often noted as pCi/L. Substances Advisory for Active Soil Gas Investigations (“the Advisory”; DTSC 2015). San Francisco Bay (Region 2) Water Quality Control Plan (Basin Plan): California Environmental Protection Agency, Regional Water Quality Control Board, San Francisco Bay Region, May 2017. The most common method of collecting an equipment The documentation and results of this leak compound analysis were provided in Attachment C of the The instructions are based on the 2015 DTSC Advisory and are designed to provide general guidance for most projects. August 19, 2015 Page 3 of 11 Soil Vapor Sampling Soil gas samples were collected in gas tight glass syringes equipped with Teflon plungers. Boulevard Casino Grand Opening the same time zones but being able to keep playing at their favorite sites. In accordance with the 2015 DTSC, “Advisory Active Soil Gas Investigations” (the “Advisory”), the sampling activities did not occur during a rain event and a storm front producing a significant rain event (defined by the Advisory as a ½ inch of ADVISORY – ACTIVE SOIL GAS INVESTIGATIONS ACKNOWLEDGMENTS Preparation of this Advisory was achieved through the efforts of the following individuals at the California Environmental Protection Agency: Rafat Abbasi Department of Toxic Substances Control Elizabeth Allen San Francisco Bay Regional Water Quality Control Board1 Bill Bosan … On 25 August 2015 H&P advanced eight temporary soil vapor wells at the Site to an This Advisory applies to both subsurface soil gas samples and soil gas samples collected in sub-slab areas under buildings. Instead, granular bentonite was hydrated to provide a seal. Soil Gas Allowed Levels. soil gas probes were installed and sampled in general accordance with the guidelines presented in the Advisory: Active Soil Gas Investigations, prepared by the California Department of Toxic Substances Control (DTSC), et al., dated July 2015. Advisory Active Soil Gas Investigations, Cal EPA, DTSC, LA Regional Water Quality Control Board, SF Regional Water Quality Board, July 2015 Final Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (Vapor Intrusion Guidance) , … July. Where there is conflict with the above-mentioned guidance documents , this Supplemental Guidance is recommended. (DTSC) held a successful Community Open House to update the on-site and off-site environmental investigation and cleanup activities related to the former Athens Tank Farm. Because of the temporary nature of the probes, grout was not used as a seal between the vapor probes. Mar 2016 – Radiological Field (Final Status) Surveys Complete May 2016 – Site Restoration Complete. California Department of Toxic Substances Control (DTSC) Advisory for Active Soil Gas Investigations (DTSC Advisory) [DTSC, 2015]. The 35 sites included in this ROD are listed in Table 1-1. Also, please see Appendix A Advisory Active Soil Gas Investigation. Control (DTSC), the Regional Water Quality Control Board (RWQCB), Los Angeles Region and the RWQCB, San Francisco Bay Region dated April 2012 (Advisory). Data obtained from soil gas investigations can be used to identify the spatial distribution of volatile … PCE in Soil Gas, Residential Receptor (1e-6 risk) RBSL (ug/m3) DTSC Sub-slab 9.2 SF-RWQCB Sub-slab 240 EPA Sub-slab 367 DTSC –5’ soil gas 230 SF-RWQCB –5’ soil gas 240 EPA –5’ soil gas 367. All located in the heart of Dublin. From 2006 to 2015, the U.S. EPA worked with eight major chemical manufacturers to voluntarily phase out production and use of so-called long-chain PFAS and their precursors (U.S. EPA 2020c) and set a nonenforceable lifetime health advisory level for PFOA and PFOS, individually or combined, of 70 ppt in drinking water (U.S. EPA 2020a). soil gas probes were installed and sampled in general accordance with the guidelines presented in the Advisory: Active Soil Gas Investigations, prepared by the California Department of Toxic Substances Control (DTSC), et al., dated July 2015. by DTSC for evaluating and mitigating vapor intrusion.11 As further described herein, DTSC has published or expects to publish separate advisory guidance for the following: active soil–gas investigations, vapor intrusion mitigation, public participation coordination and the remediation of chlorinated VOCs in vadose zone soil. Title 1. PES on March 17, 2015. Methane concentrations and soil pressures were field measured from each vapor probe using an RKI Eagle2 four-gas meter and magnehelic gauges, in accordance with LADBS P/BC 2014-101, Site Testing Stands for Methane. The Supplemental Guidance emphasizes the importance of collecting soil gas probe samples at least twice in different … Laboratory QA/QC Requirements for Metal Analyses (RWQCB, 2001b). ... We sampled 20 soil gas wells, made 1 well repair and installed 4 new wells. Control (DTSC) Advisory – Active Soil Gas Investigations dated July 2015 (DTSC Active Soil Gas Investigation Advisory). Advisory for Active Soil Gas Investigations published by the Department of Toxic Substances Control (DTSC), the Regional Water Quality Control Board, Los Angeles Region and the RWQCB, San Francisco Bay Region dated April 2012 (Advisory). Advisory – Active Soil Gas Investigations (July 2015) This Cal EPA Advisory was jointly revised and updated July 2015 by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Regional Water Quality Control Board. The July 2015 version also supersedes previous versions produced in 2003 and 1997. • CA-DTSC/OEHHA/Water Boards –New VI Guidance (10/2011) & Soil Gas Advisory (4/2012) –Retracted TPH Guidance • EPA Region 9 –Adopted Higher Value for PCE –oops, but not on CA sites • SF-RWQCB –ESLs updated in December 2013–TPH fractions SL decreased • SWQCB –Low Threat Closure Policy –TPH Not A Concern (DTSC). Appendix E: Advisory Active Soil Gas Investigations (DTSC, 2012) Blaser Office SAP v FEBRUARY 26, 2015 ... 2015 1.0 INTRODUCTION The Inhalation Pathway Interim Measure (IPIM) ... for soil gas sampling (DTSC, 2012). Cal EPA (California Environmental ProtectAgency), 2015, Advisory, Active Soil Gas ion Investigations, August 2015. Tubing placed in the ground for soil gas sampling was purged three different times as recommended by DTSC guidance document. these CSL values are established, DTSC recom-mends that the DTSC PEA Guidance Manual or an equivalent process be referenced. Prepared for . areas based on the results of the 2006 soil gas investigation and HHRA (Geomatrix, 2006). Sources of particulate matter can be … Leak checks involving “shut-in” and tracer tests were performed using a conservative tracer gas (e.g. Mr. Vapor sources may include contaminated soil in the vadose zone, free-phase or residual non-aqueous phase CalEPA, 2015. DTSC/RWQCB Soil Gas Guidelines (July 2015) Subsurface Injection of In Situ Remedial Reagents (LARWQCB 09/2009) CCR Chapter 16 (UST … This guid-ance may include the Regional Water Quality Control Board’s (RWQCB) guidelines for reuse of non-hazardous petroleum hydrocarbon con-taminated soil as applied to Total Petroleum Hy-drocarbons (TPH) only. Advisory for Active Soil Gas Investigations (DTSC and RWQCB, 2012). The Supplemental Guidance incorporates, by reference, the sampling methods described in CalEPA’s 2015 Active Soil Gas Investigations Advisory but makes specific Los Angeles Regional Water ... •Soil gas concentrations in samples collected from soil gas probes or headspace of ... (California DTSC, 2015) ¥ California DTSC (2015) present soil drainage curves for a simulated instantaneous infiltration of 1 cm. iii. The soil gas survey generally complied with the DTSC/California Regional Water Quality Control Board (RWQCB) - Los Angeles Region “Advisory - Active Soil Gas Investigations” guidance, dated April 2012 and the soil sampling conformed to current environmental industry standards. Incident Name: Soil Removal in Mecca (June-July 2015) Department of Toxic Substances Control (DTSC) Emergency Response staff oversaw the removal of several hundred yards of soil contaminated with copper, chromium, and arsenic from an abandoned vineyard near the town of Mecca. Tetra Tech Advisory – Active Soil Gas Investigations (July 2015) This Cal EPA Advisory was jointly revised and updated July 2015 by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Regional Water Quality Control Board. A total of 23,203 tons of soil were disposed of as non-hazardous waste. Soil Gas Sampling using the Helium shroud techniquedescribed in Appendix C, page 57, CA DTSC Soil Gas Advisory Document (March2010) is employed to ensure valid soil gas samples are collected. CHHSLs are concentrations of chemicals in soil-gas that are below the theoretical thresholds of concern for human health risks. Advisory (ASGI) published jointly by the DTSC, Regional Water Quality Control Board, Los Angeles Region(RWQCB-LA), and Regional Water Quality Control Board, San Francisco Region (RWQCB-SF). Soil gas samples were collected from thirteen locations at 5 feet bgs (SV1 through SV13) and at 10 feet bgs at four locations (SV1, SV2, SV10, and SV-12). This advisory provides guidance on investigations and common remedies for school sites where methane gas is the only chemical of concern present in subsurface soils. Soil gas samples SV1 through SV7 were Ms. Hogue said there is a new board chair, Tim Molinare. 22690 Stevens Creek Boulevard, Cupertino, California 95014 (Three parcels with APNs 342-14-04, 342-14-05, and 342-14-66) Flow Diagram of DTSC Vapor Intrusion Documents. • Soil vapor sampling for determination of a release should be Draft Treasure Island Restoration Advisory Board Meeting Minutes, 21 April 2015 Page 3 of 9 TRIE-2205-0058-0009 (CDPH). – Always purge the sand and dry bentonite, no matter Currently, the work plan for the upcoming SWDA removal is being reviewed by the regulatory agencies. She can also be reached by phone at her office at (510) 540-3779. d) Three nested soil vapor probes will be installed at depths of 5, 30, and 55 feet bgs in each of the eight 55-foot borings, in accordance with the Department of Toxic Substances Control (DTSC) 2015 . Here are links to relevant documents: Soil vapor samples will be analyze d by a California certified independent analytical laboratory for All of the soil and debris excavated from the SWDAs will be radiologically scanned. areas based on the results of the 2006 soil gas investigation and HHRA (Geomatrix, 2006). of Toxic Substances Control (DTSC) Advisory for Active Soil Gas Investigations (DTSC, July 2015). For Interim Site Assessment and Cleanup Guidebook (RWQCB, 1996b). Advisory – Active Soil Gas Investigations (July 2015) Interim Framework for Assessment of Vapor Intrusion at TCE-Contaminated Sites in the San Francisco Bay Region (2014) Final Guidance for the Evaluation & Mitigation of Subsurface Vapor Intrusion to Indoor Air (2011) Advisory – Active Soil Gas Investigations (July 2015) This Cal EPA Advisory was jointly revised and updated July 2015 by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco Regional Water Quality Control Board. 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