|Phillips 66 (P-66) is the owner/operator of this former petroleum refinery site. The former refinery was built in or around 1904. In 1982, P-66, through a Consent Order with the State, installed a groundwater monitoring system which was followed in 1984 by a groundwater/LNAPL recovery system. The intent of the groundwater recovery system is to contain contaminated groundwater and to recover free-phase hydrocarbon. Because of poor performance, age of the system and diminished amount of recovered LNAPL (light non-aqueous-phase liquid), Phillips ceased operation (with EPA and KDHE approval) of the groundwater and LNAPL recovery system. Phillips continues to monitor groundwater for quality and contaminant containment and has contingency actions in place should this monitoring identify off-site contaminant migration. Phillips, through an amended consent order, is completing a Comprehensive Investigation (CI), Human and Ecological Risk Assessment, and is drafting a Corrective Action Study (CAS) wherein potential remedial alternatives which are suitably protective of human health and the environment are identified/proposed for the site. P-66 completed supplemental investigation tasks required by KDHE and the USEPA. KDHE/USEPA completed review of this supplemental document providing technical review comments which led KDHE/EPA approval. P-66 then completed the draft Risk Assessment (RA) planning documentation and RA report.
Environmental Indicators (EI) for the site where completed consistent with USEPA guidance and show human health exposure (CA725) and migration of contaminated groundwater (CA750) are both under control. Additional EIs include: selection of a remedial alternative protective of human health and the environment (CA400); and, completing construction of the selected remedy (550).
KDHE and EPA completed technical review of the revised CI (including the Focused and Ecological Risk Assessments as an attachment to the Revised CI) and provided technical review comments. The P-66 contractor provided comment responses to the CI and Focused RA on July 12, 2012 which KDHE/EPA approved on November 7, 2012. The P-66 contactor then submitted errata sheets for review on 11-16-2012. These revised pages were also provided to the KDHE Risk Assessment Support contractor for review consistent with USEPA and state RA guidance. The CI including section 8.0 (Ecological Risk Assessment) and Attachment 1 (Human Health Risk Assessment) has been approved. P-66 prepared a Draft Corrective Action Study which KDHE reviewed providing comments to P-66. Since this time, P-66 reevaluated the path forward considering RCRA Corrective Action requirements - a new CAS, based on these considerations was submitted for KDHE BER review August 20, 2018 and approved with comment on November 30, 2018. A draft decision document (Corrective Action Decision - CAD) is in public comment ending December 15, 2019.