| #Q001 | administrative | unknown | recommended | Obtain implementation guidance | drinking water | Specific guidance related to the implementation of drinking water guidelines should be obtained from the appropriate drinking water authority in the affected jurisdiction. | | high |
| #Q002 | corrective_action | operational | recommended | Develop plan for short-term exceedances | drinking water | For drinking water supplies that occasionally experience short-term exceedances above the guideline values, it is suggested that a plan be developed and implemented to address these situations. | Occasionally experience short-term exceedances above the guideline values | high |
| #Q003 | corrective_action | health | recommended | Consider alternative sources for long-term exceedances | drinking water | For more significant, long-term exceedances that cannot be addressed through treatment, it is suggested that alternative sources of water for drinking, showering, and bathing be considered. | Significant, long-term exceedances that cannot be addressed through treatment | high |
| #Q004 | monitoring | operational | recommended | Characterize groundwater sources | drinking water | Groundwater sources should be characterized to determine if toluene, ethylbenzene and xylenes are present, especially if the land use history is unknown. | Especially if the land use history is unknown | high |
| #Q005 | monitoring | operational | recommended | Conduct quarterly monitoring for impacted sources | drinking water | Quarterly monitoring for toluene, ethylbenzene and xylenes should be conducted for groundwater sources that are or may have been impacted by hydrocarbon spills or other potential contamination with these compounds. | For groundwater sources that are or may have been impacted by hydrocarbon spills or other potential contamination | high |
| #Q006 | monitoring | operational | recommended | Monitor distribution system near plastic pipes | drinking water | Monitoring of the distribution system is recommended when contamination has occurred in soil where there are plastic pipes. | When contamination has occurred in soil where there are plastic pipes | high |
| #Q007 | monitoring | operational | guidance | Consider reduced monitoring for remediated sites | drinking water | Authorities may consider reduced monitoring when it has been demonstrated that a previously contaminated site has been successfully remediated. | When it has been demonstrated that a previously contaminated site has been successfully remediated | high |
| #Q008 | corrective_action | operational | recommended | Develop plan for elevated monitoring levels | drinking water | In the event that monitoring data show elevated levels of toluene, ethylbenzene and xylenes, it is suggested that a plan be developed and implemented to address these situations. | In the event that monitoring data show elevated levels of toluene, ethylbenzene and xylenes | high |