• Embalming Services Dubai

    Epa vapor intrusion screening levels. subsurface vapor intrusion.

    Epa vapor intrusion screening levels June 2015 Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air DISCLAIMER This document presents current technical recommendations of the U. . included recommendations, one of which was for EPA to issue final vapor intrusion guidance that incorporates information on how risks from petroleum hydrocarbon vapors should be addressed. What You Should Know About Vapor Intrusion What is Vapor Intrusion? • For health related questions regarding vapor intrusion, contact your local health department or the federal Agency for Toxic Substances and Disease Registry at: 1-888-422-8737 or visit their Web site at www. A screening level based upon a 1 in 10,000 l concern that do not have an Acute Vapor Intrusion Screening June 2015 Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air DISCLAIMER This document presents current technical recommendations of the U. The screening levels for groundwater and soil gas (either sub-slab gas or soil gas collected exterior to buildings) are calculated Screening Levels (RSL) tables (EPA 2011) and will be updated as new versions of the RSL tables are released. Vapor Intrusion Investigation Area – This figure depicts the original vapor intrusion investigation boundary based on the screening levels in place during 2008 and the revised boundary based on the 2013 New Jersey Department of Environmental Protection (NJDEP) groundwater vapor intrusion screening levels. To be consistent with the 2015 OSWER Vapor Intrusion Guidance (PDF) (267 pp, 3 MB), EPA has removed the soil model option and non-aqueous phase liquids models. Vapor Intrusion Screening Level Supporting Equations. This on-line calculator implements the Johnson and Ettinger (J&E) (Johnson and Ettinger, 1991) simplified model to evaluate the vapor intrusion pathway into buildings. Vapor intrusion occurs when there is a migration of volatile chemicals from contaminated groundwater or soil into an overlying building. The following criteria are now used to define a chemical as volatile in the RSLs: 1) vapor pressure greater than 1 mm Hg or 2) Henry's Law constant Conceptual Vapor Intrusion Mitigation System (EPA 2008a) . 1. Brownfields Technology Primer: Vapor Intrusion Considerations for Redevelopment (PDF) (49 pp, 1. This blog post provides a quick summary of human health screening levels for California risk assessments, including recent updates: https://www. The web calculator is linked to the Regional Screening Level databases of toxicity and chemical parameters to provide continuity between the two tools for determining air screening levels and risks. The following criteria are now used to define a chemical as volatile in the RSLs: 1) vapor pressure greater than 1 mm Hg or 2) Henry's Law constant Use of U. kirstin@epa. Stuart Walker Unless the vapor intrusion pathway is determined to be incomplete during the preliminary screening steps, six steps follow that describe the vapor intrusion investigative process (see considerations, guidance for development of screening levels, an indoor air survey form, and a discussion of community stakeholder concerns. c or ca: Cancer is driving screening level: See section 5. Vapor Intrusion Handbook . CONCLUSION If you have any questions about the RVISL calculator, please contact Mr. Final Project Report for the Development of an Active Soil Gas Sampling Method. The OSWER Technical Guide For Assessing And Mitigating The Vapor Intrusion Pathway From Subsurface Vapor Sources To Indoor Air (OSWER Publication 9200. Alternative approaches for risk assessment may be found to be more appropriate at specific sites (e. OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance) (PDF). The Vapor Intrusion Screening Levels were updated based on EPA's on-going evaluation of the toxicity of compounds as well as the EPA methods to calculate risk-based screening values for contaminant concentrations. EPA has prepared several documents and tools to support development of its Final Subsurface Vapor Intrusion Guidance. July 2007. Environmental Protection Agency (EPA) guidance on correlating soil or groundwater levels of radon with indoor radon concentrations at Superfund sites. c The concentrations of each The NJDEP VI Guidance is used in the implementation of vapor intrusion programs throughout New Jersey. Superfund Vapor Intrusion FAQs Page 1 consistent with the Vapor Intrusion Screening Level calculator, which identifies chemicals considered to be sufficiently volatile and toxic to warrant a soil gas intrusion pathway investigation when present as subsurface contaminants. November 2002. 34 3b. Volatile chemicals can emit vapors that may migrate through subsurface soils and into indoor air spaces. The chemical-specific parameter values used in the VISL calculator follow the same hierarchy as used in the EPA's Regional Screening Levels for Chemical Contaminants at Superfund Sites calculator. Determine whether the vapor intrusion pathway poses an unacceptable health risk to building occupants using data collected and the following link: EPA OSWER Vapor Intrusion Screening Level (VISL) Calculator, Version 3. These screening levels are denoted by an asterisk. , where sit Predict indoor air concentrations, and risk, from measured media concentrations? *Chronic selection will retrieve Chronic-only RfDs/RfCs; Subchronic selection will retrieve subchronic values where possible. Terry@epa. 1,4-Dioxane is a potential concern at industrial facilities with groundwater contaminated with 1,4-Dioxane. Where and when is vapor intrusion a potential concern? Vapor intrusion is a potential concern wherever buildings or other enclosed structures are located near an underground source Indoor Air Vapor Intrusion Database. Additional guidance is also provided on sources of parameters and proper VISL use. gov subsurface vapor intrusion. ; Vapor Intrusion Database — Contains site-specific measurements of vapor attenuation factors, which express The chart also details the MPCA Acute Vapor Intrusion Screening Level. 14 of the user's guide. The earliest version of the VISL Calculator was based on November 2011 RLSs and was generally a great improvement over SL Indoor Air Vapor Intrusion Database. gov. epa. 4 of the RSL User's Attached are the indoor air screening levels that we would use ‐ we would use the residential (RES) numbers for the Stilman, Terry <Stilman. In response to stakeholder requests, EPA’s Office of Underground provided in “Sample Collection and Evaluation of Vapor Intrusion to Indoor Air” (Ohio EPA 2020). 9 Response Action Levels and Recommendations to Address Near-Term Inhalation Exposures to TCE in Air from Subsurface Vapor Intrusion (2014). These VISLs, which are calculated by the VISL Calculator (EPA, 2014b), are generally recommended, medium-specific, risk-based screening-level tables in the EPA’s November 2002 draft vapor intrusion guidance (EPA 2002). Some of these principles you In 2016, EPA established advisory Vapor Intrusion Screening Levels (“VISL”) for hundreds of chemicals, including 1,4-dioxane. Why are the Ground Water • EPA Typically, however, vapor concentrations are present at low levels, to which long-term exposure may pose increased risk for chronic health effects. The screening levels for groundwater and soil gas (either sub-slab gas or soil gas collected exterior to buildings) are calculated from the target indoor air concentrations using empirically-based conservative “generic” attenuation EPA’s Vapor Intrusion Screening Level (VISL) Calculator is an essential tool for vapor intrusion (VI) work. The Vapor Intrusion Screening Level (VISL) calculator identifies chemicals that are considered to be sufficiently volatile and toxic to warrant an investigation of the soil gas intrusion pathway when they are present as subsurface contaminants. us. Sample results from residences near the Reilly site will which does not support the route-to-route extrapolations that were used in the now outdated screening tables in the EPA’s November 2002 draft vapor intrusion guidance (EPA 2002). The RVISL calculator: (1) lists three radon isotopes (Rn-219, Rn-220 and Rn NJDEP VAPOR INTRUSION GUIDANCE Ground Water Screening Levels: Default Values and Site-Specific Evaluation Paul Sanders New Jersey Department of Environmental Protection paul. , homes, businesses, schools). Residential Nonresidential ug/m3 ug/m3 Rapid Action Levels b b Levels are the lower value generated using a factor of 100x for carcinogens and a factor of 2x for noncarcinogens using the Table A-5 health-based values. EPA Spreadsheet for Modeling Subsurface Vapor Intrusion — This spreadsheet tool implements the steady-state solution to vapor transport (infinite or non-diminishing source and steady-state vapor concentrations) described by Johnson and Ettinger in 1991. The VISL now uses the same database as the Regional Screening Levels (RSLs) for toxicity values and physiochemical parameters and will be automatically updated during the semi-annual RSL updates. 9 MB) EPA. Pure Phase Vapor Concentration Groundwater Vapor Concentration Indoor Air Concentration Derived from Soil Gas Concentration tables in the EPA’s November 2002 draft vapor intrusion guidance (EPA 2002). EPA, 2002c), and the chemical-specific Henry's Law constants (HLC) and soil/organic carbon partition coefficients (JC) taken from the VISL Calculator and shown in Table 1. nj. March 2020 . , not above RMLs) typically do not require a prompt U. 2012 RSLs Go to Vapor Intrusion Screening Levels. VOC Volatile organic compound . Author: Martin (Mort) Schmidt, CPG & Craig A. The RVISL calculator provides default parameters that can be modified to reflect site-specific conditions. 94 KB, May 2014) Soil Screening Level: See section 4. For more information consult the VISL Calculator User's Guide (PDF) . Thus is a theoretical risk and not an actual Air Screening Concentrations Table January 15, 2016 The Division has prepared a table listing indoor air remediation goals and action levels for a number of volatile organic compounds to be used at sites where vapor intrusion may be a concern. This guide sets forth a recommended, but not mandatory, approach based upon currently available information with respect to risk assessment at sites. An extensive Tools. com • Risk Based Screening Levels • Bioattenuation . EPA's Regional Screening Levels as Screening Values in Human Health Risk Assessment companion document which provides clarification on implementation of Ohio EPA's “Sample Collection and Evaluation of Vapor Intrusion to Indoor Air” (Ohio EPA 2020). The OSWER Technical Guide For Assessing And Mitigating The Vapor Intrusion Pathway From Subsurface Vapor Sources To Indoor Air EPA-OUST Petroleum VI Workshop February 2010 Vapor Intrusion Fundamentals Vapor Intrusion Fundamentals Dr. In response to stakeholder requests, EPA’s Office of Underground . Applicability of the VISL Calculator Spreadsheet The subsurface target concentrations in the VISL Calculator are based on the generic conceptual model for vapor intrusion described in EPA’s draft vapor intrusion guidance. Vapor Intrusion Assessment EPA New England Region 1 Air Monitoring Team tables in the EPA’s November 2002 draft vapor intrusion guidance (EPA 2002). The model can now calculate output for multiple chemicals simultaneously. Based on the results of the RI, three residences (RP‐039, RP‐047, and RP‐49) were found to have both a complete vapor intrusion pathway and site‐related contamination in indoor air at concentrations 1. 2 Chemical-specific Parameters Hierarchy. T. This website is no longer updated and links to external websites and some tables in the EPA’s November 2002 draft vapor intrusion guidance (EPA 2002). Generally, the most recent version of the U. United States Environmental Protection Agency Region 5 Superfund and Emergency Management Division . Vapor Intrusion guidance and screening levels. gov • For more detailed information on EPA’s vapor intrusion sampling, visit the EPA’s Web site at: DEQ updated its vapor intrusion RBCs in June 2023 by incorporating EPA's vapor intrusion attenuation factors, including lowering the soil vapor and groundwater screening levels. According to EPA’s 2002 Draft Vapor Intrusion Guidance, “EPA does not expect this guidance [sic] be used • Current Spreadsheet input process Web -Based Calculator for Vapor Intrusion Screening Levels (VISL) Galloway, Leslie D 1, Fred Dolislager1, Stephine Smith2, Alicia M. Risk-based target screening levels and incremental risk estimates are now included in the model predictions. Cox, CPG In February 2018, US EPA updated its Vapor Intrusion Screening Level (VISL) Calculator in a number of ways. EPA developed a spreadsheet calculator, the Vapor Intrusion Screening Level (VISL) Calculator (XLSM) (14 pp, 1 MB) that: provides generally recommended, media This document describes the calculation of recommended, but not mandatory, screening levels for use in evaluating the vapor intrusion pathway at CERCLA and RCRA sites. EPA. Petroleum Vapor Intrusion (PVI) Supplemental Guidance: Screening and Evaluating Vapor Intrusion The CalEPA Vapor Intrusion Workgroup released the Final Draft Supplemental Guidance: Screening and Evaluating Vapor Intrusion in February 2023. Details of the chemical-specific parameter hierarchy can be found in section 2. This document does not establish binding rules. gov> VAPOR INTRUSION INDOOR AIR SCREENING LEVELS Author: QUIGGLE, LISA / NONE Subject: Region ID: 05 DocID: 951384; DocDate: 11-05-2019 Vapor Intrusion Assessment EPA New England Region 1 Air Monitoring Team Peter Kahn, Alysha Lynch, Scott Clifford, and Dan Curran August 19, 2013 Go to Vapor Intrusion Screening Levels. EPA's Regional Screening Level Tables, applying a 1 x 10E-5 excess lifetime cancer risk or a hazard index of 1 for non-carcinogens. Vapor Intrusion Sampling and Analytical Procedures. g. The Vapor Intrusion Database contains data to support site-specific estimates of vapor attenuation, or the reduction in vapor concentrations as vapor-farming chemicals move from soil and groundwater into indoor air. The Quick Look-Up Table the Radon Vapor Intrusion Screening Level electronic calculator. These ----- these subslab vapor screening levels were calculated using Equation 1, default values for soil properties from EPA's Supplemental Soil Screening Guidance (U. •Risk-based RVISL: the tool calculates screening levels based on a target cancer risk of 10-6. Screening Levels (RSL) tables (EPA 2011) and will be updated as new versions of the RSL tables are released. To use Read More > This California Vapor Intrusion (VI) Blog provides updates on CalEPA’s rule development process associated with increasing attenuation factors (AFs) for volatile organic compounds. A screening level based upon a 1 in 10,000 lifetime cancer risk was calculated for the few chemicals of concern that do not have an Acute Vapor Intrusion Screening Level. 2MB, About PDF) The Brownfields and Land Revitalization Technology Support Center has developed this primer for land revitalization stakeholders concerned about vapor intrusion, including property owners, municipalities, and real estate This document describes the structure and operations of the VISL calculator. Risks were estimated utilizing EPA’s Vapor Intrusion Screening Level (VISL) Calculator using the Groundwater Concentration to Indoor Air Concentration model to estimate vapor intrusion Currently, there is no U. S. Environmental •This tool allows EPA to calculate radon screening levels inside buildings at Superfund sites based on risk, dose, working levels (WLs), or pCi/L. The most protective value is chosen for the summary table. Additionally, soil RBCs were removed because the latest scientific evidence shows that soil data is not a reliable way to screen out risk from vapor intrusion. results in excess of the residential soil vapor intrusion screening level. EPA Project Team: Kirstin Safakas Community Involvement Coordinator safakas. How the In the chart below are screening levels EPA will use to help analyze the sample data. state. Environmental Screening Levels. VISL Vapor Intrusion Screening Level Calculator . To navigate to the current EPA website, Vapor Intrusion Screening Level Calculator; Other Resources. Cancer and noncancer screening levels are presented in the supporting tables. EPA Vapor Intrusion Screening Levels (VISL), March 2012 Toxicity Class (EPA Regionional Screening Levels (RSL) Table, Nov 2018) Value exceeds the theoretical risk that 1 additional case of cancer will occur in a population of 1 million than statistically expected. Sub-slab Soil Gas Sampling Technique The RSL workgroup coordinated with the Vapor Intrusion Screening Level workgroup to ensure a consistent approach to volatility. If all input The screening levels for groundwater and soil gas (either sub-slab gas or soil gas collected exterior to buildings) are calculated from the target indoor air concentrations using empirically-based conservative "generic" attenuation factors that reflect generally reasonable worst-case conditions as described in the EPA's draft vapor intrusion For guidance on vapor intrusion assessment, see EPA's Vapor Intrusion Site. Vapor Intrusion Risk Calculations Results from the August 2014 groundwater sampling were used to estimate potential risks associated with vapor intrusion. It is worth noting that the EPA has committed to release a Final Vapor Intrusion Guidance document by November 2012 (EPA 2010). The VISL Calculator now consists of an online calculator, instead of a downloadable spreadsheet, and it is in most respects, more powerful and easier to use. 5-The Soil Gas Action Level is based on the target sub-slab soli gas concentration In the most current EPA Vapor Intrusion Screening Level calculator, as calculated for the appropriate residential or industrial scenario and target non- cancer or cancer risk. EPA Vapor Intrusion Guidance discusses prompt actions to be taken when measured indoor air concentrations pose an unacceptable human health risk for an acute or short-term exposure scenario (See If you wish to receive notifications when Regional Screening Levels are updated, use the signup form. gov 312-919-4621 Erik Hardin Remedial Project Manager hardin. Vapor Intrusion Screening Level Calculator User Guide (pdf) (559. EPA's Vapor Intrusion Database: Evaluation and Characterization of Attenuation Factors for Chlorinated Volatile Organic Compounds and Residential Buildings; Vapor Intrusion Screening Levels; Related Links Underground Storage Tanks: Petroleum Vapor Intrusion. OSHA also does not apply to adjacent workers, such as administrative staff, who may be exposed to TCE. Please note that To be consistent with the 2015 OSWER Vapor Intrusion Guidance (PDF)(267 pp, 3 MB), EPA has removed the soil model option and non-aqueous phase liquids models. Link to RSL Tables Please use the form below to send questions specific to the Regional Screening Level (RSL), Regional Removal Management Level (RML), Vapor Intrusion Screening Level (VISL), or the Superfund Risk Assessment websites. EPA Region 10 Recommendations Regarding Trichloroethylene Toxicity in Human Health Risk Assessments (December 13, 2012). Disclaimer . Indoor Air Vapor Intrusion Database. EPA Vapor Intrusion Screening Level (VISL) calculator should be applied corresponding to an excess lifetime cancer risk of 1E-5 and a noncancer hazard quotient of 1. erik@epa. EPA-OUST Petroleum VI Workshop February 2010 Vapor Intrusion Fundamentals Vapor Intrusion Fundamentals Dr. gov 312-886-2402 This diagram shows how vapors can rise through soil and into your home. This means that a person exposed to the contamination has a one in a The tapwater screening level of 14 µg/L is based on EPA's RfD and using standard RSL equations. EPA is developing the Radon Vapor Intrusion Level Calculator (RVISL) Calculator which is an online tool. Gaines3 1 The Institute for Environmental Modeling, The University of Tennessee, Knoxville, Knoxville, TN; 2 The University of Tennessee, Knoxville, Knoxville, TN; 3 Office of Superfund The vapor intrusion evaluation was conducted based upon EPA’s 2002 Draft Vapor Intrusion Guidance (EPA 2002) and EPA’s preliminary review of the 2002 guidance document (EPA 2010). The screening levels for groundwater and soil gas (either sub-slab gas or soil gas collected exterior to buildings) are calculated from the target indoor air concentrations using empirically-based conservative “generic” attenuation The EPA's Vapor Intrusion Screening Level (VISL) Calculator User's Guide for Chemical Contaminants provides descriptions, equations, and default exposure parameters used to calculate the risk-based VISLs. EPA personnel (and of course, states) are free to use and accept other technically sound approaches, either on their own initiative, or at the screening levels be applied to these situations. Page 3 of 3 TABLE 2 NJDEP RAPID ACTION LEVELS FOR INDOOR AIR 2021 Cancer/ Noncancer a Chemical CAS No. (178 pp, 1. Wisconsin Vapor Quick Look-Up Table of Indoor Air Vapor Action Levels (VALs) And Vapor Risk Screening Levels (VRSLS) Indoor air vapor action levels (VALs) are based on U. 2. sanders@dep. The Vapor Intrusion Database contains data to support site-specific estimates of vapor attenuation, or the reduction in vapor concentrations as vapor-forming chemicals move from soil and groundwater into indoor air. 0 Nov. The DTSC recommends a step-wise approach as discussed below and depicted in Figure 1 for the evaluation of vapor intrusion. atdsr. To keep VISL Vapor Intrusion Screening Level VOC Volatile Organic Compound v . stuart@epa. Final Project Report for the Development of an Active Soil Gas Sampling Method (PDF The RSL workgroup coordinated with the Vapor Intrusion Screening Level workgroup to ensure a consistent approach to volatility. The recommendations in this guidance may be appropriate for such situations, although But subsurface chemicals entering the building through vapor intrusion are exceptions, and the differences can be confusing. 34 TABLES Table Page 1. Actual Vapor Intrusion Mitigation System (ITRC 2007) . Blayne Hartman Hartman Environmental Geoscience blayne@hartmaneg. e. This website is historical material reflecting the EPA website as it existed on January 19, 2021. EPA determines probability of a non-cancer detrimental health effect to occur by calculating a The EPA's Vapor Intrusion Screening Level (VISL) Calculator User's Guide for Chemical Contaminants provides descriptions, equations, and default exposure parameters used to The Vapor Intrusion Screening Level (VISL) calculator identifies chemicals that are considered to be sufficiently volatile and toxic to warrant an investigation of the soil gas The revised Vapor Intrusion Risk Management Decision Matrix identifies appropriate Region 7 response actions (or non-actions) to address a range of potential health risks posed by the The Vapor Intrusion Screening Level (VISL) Calculator is a spreadsheet tool that (1) lists chemicals considered to be volatile and known to pose a potential cancer risk or noncancer To navigate to the current EPA website, please go to www. 978577 vapor intrusion. Final Project Report for the Development of an Active Soil Gas Sampling Method (PDF Welcome to the "Radon Vapor Intrusion Screening Level (RVISL) Calculator Home Page for Radionuclide Contaminants at Superfund Sites". For your convenience, a User's Guide is provided as the first tab of the Excel® file. Some of these principles you VISL Vapor Intrusion Screening Level VOC Volatile Organic Compound v . 2-154; June 2015) can be found there among other resources and information. has recommended Acute Vapor Intrusion Action The chart below defines Reilly Tar site-specific screening levels for indoor air and sub cancer risks equating to a hazard index of 1, and a lifetime cancer risk of 1 in Intrusion Screening Level. This is a summary of the topics we will cover. 8 of the user's guide. The screening levels for groundwater and soil gas (either sub-slab gas or soil gas collected exterior to buildings) are calculated from the target indoor air concentrations using empirically-based conservative “generic” attenuation If you wish to receive notifications when Regional Screening Levels are updated, use the signup form. Environmental Protection Agency (EPA) For the purposes of making Current Human Exposures Under Control El determinations with respect to vapor intrusion under RCRA and CERCLA, EPA generally recommends the use of 10"5 values. Concentrations slightly above screening levels (i. cdc. Do the RSLs factor inhalation from vapor intrusion? Air RSLs represent screening levels for indoor or outdoor air. The RVISL calculator output provides screening values and risk and dose estimates for residential and commercial/industrial exposures to radon in soil gas, air, and groundwater. Background. There Radon Vapor Intrusion Screening Level (RVISL) Calculator Stuart Walker –walker. it may also be necessary to consider the noncancer toxicity of uranium, using Due to the complexity of vapor intrusion, many professional disciplines may be needed to evaluate and mitigate exposure. Because of concerns that subsurface contamination in either soil or groundwater can adversely impact indoor air quality, in 1998, EPA developed a series of models for estimating indoor air concentrations and associated health risks from subsurface vapor intrusion into buildings. This was prompted in response to the U. The screening levels for groundwater and soil gas (either sub-slab gas or soil gas collected exterior to buildings) are calculated from the target indoor air concentrations using empirically-based conservative “generic” attenuation The Vapor Intrusion Screening Level (VISL) calculator is now available as an online calculator, replacing previous versions in MS-Excel workbooks. For guidance on vapor intrusion assessment, see EPA's Vapor Intrusion Site. Note that VISL-based Soil Gas Action Levels may be Inappropriate where groundwater The web calculator is an expansion of the previously provided VISL Spreadsheet for Modeling Subsurface Vapor Intrusion capabilities. n or nc: Noncancer is driving screening level The chart also details the MPCA Acute Vapor Intrusion Screening Level. EPA 530-D-02-004. This level, in EPA's view, serves as a generally reasonable screening mechanism for the vapor intrusion pathway. The contribution of sub slab TCE is determined based on CERCLA vapor intrusion guidance, such as using the vapor intrusion screening level (VISL) calculator (available at For example, EPA provides vapor intrusion screening levels (VISLs) for a variety of volatile chemicals known to pose a potential cancer risk or noncancer hazard through the inhalation pathway. The Vapor Intrusion Screening Level (VISL) calculator is now available as an online calculator, replacing previous versions in MS-Excel workbooks. What is vapor intrusion? Vapor intrusion refers to the migration of chemical vapors from any underground source into structures (e. Accordingly, an appropriate project team should be gathered for all vapor intrusion issues. gov, (703) 603-8748 Office of Superfund Remediation and Technology 1. Frame 3, Linda G. betejs pxaq bzgbacq xgjep ogajxarf ztia tbkz hixdcb mlt lzsrxtj gbcjltc sdah xaaqxs doesa mqaa