PROJECT SUMMARY
WHAT:
Environmental Risk Evaluation
WHO:
Jennifer Lindquist, PG Ray Kirk, P.E.
WHERE:
Petroleum Refining South Louisiana
WHEN:
2012-2015
BACKGROUND
n 2012, a major refinery located in southern Louisiana discovered that a sewer collection system was leaking hydrocarbons. An assessment discovered that leaks were occurring from nearly 10% of the approximately 500 junction boxes in the system. CK designed and implemented an LNAPL recovery system, characterized the constituents of concern in soil and groundwater, and worked with LDEQ to develop site specific risk standards based upon conditions at the most severely impacted junction box.Risk standard development included an evaluation of potential receptors, additivity effects, aquifer characteristics, and groundwater fate and transport mechanisms. Each impacted junction box was considered a separate area of investigation (AOI). The LDEQ- approved site-specific standards developed for the most severely impacted AOI were immediately applied to the AOIs that exhibited no LNAPL, and LDEQ issued a no further action (NFA) determination for those AOIs. Once LNAPL recovery was completed, the LNAPL-impacted AOIs were reassessed. The approved site-specific risk standards were applied to the remaining junction boxes in order to obtain an NFA for the site. A reevaluation of all data enabled the entire site to be closed under a non-industrial scenario requiring no institutional controls. Perimeter groundwater monitoring will continue until four consecutive monitoring events have been recorded.
PROJECT SUMMARY
WHAT:
Environmental Risk Evaluation
WHO:
Jennifer Lindquist, PG Ray Kirk, P.E.
WHERE:
Petroleum Refining South Louisiana
WHEN:
2012-2015
BACKGROUND
n 2012, a major refinery located in southern Louisiana discovered that a sewer collection system was leaking hydrocarbons. An assessment discovered that leaks were occurring from nearly 10% of the approximately 500 junction boxes in the system. CK designed and implemented an LNAPL recovery system, characterized the constituents of concern in soil and groundwater, and worked with LDEQ to develop site specific risk standards based upon conditions at the most severely impacted junction box.Risk standard development included an evaluation of potential receptors, additivity effects, aquifer characteristics, and groundwater fate and transport mechanisms. Each impacted junction box was considered a separate area of investigation (AOI). The LDEQ- approved site-specific standards developed for the most severely impacted AOI were immediately applied to the AOIs that exhibited no LNAPL, and LDEQ issued a no further action (NFA) determination for those AOIs. Once LNAPL recovery was completed, the LNAPL-impacted AOIs were reassessed. The approved site-specific risk standards were applied to the remaining junction boxes in order to obtain an NFA for the site. A reevaluation of all data enabled the entire site to be closed under a non-industrial scenario requiring no institutional controls. Perimeter groundwater monitoring will continue until four consecutive monitoring events have been recorded.