Updated: August 14, 2019Printable (PDF) Version
At 4:15 p.m., Sunday, Nov. 25, ethylene oxide (EO) was accidentally released into the air from Croda’s ethylene oxide plant. Since EO is very soluble in water, Croda deployed its water deluge system to contain as much of the release as possible. Croda personnel also began transferring the EO from the leaking vessel in the processing equipment to a secure containment vessel. Local responders and DNREC Emergency Response arrived. Water suppression continued. With input from Croda personnel, responders determined that by opening two nitrogen valves in the processing equipment, the remaining EO from the leaking vessel could be transferred to the non-leaking vessel, stopping the release.
DNREC’s Emergency Response Team, the Delaware Fire School, and numerous New Castle County volunteer fire companies under the command of the Holloway Terrace Fire Company were the responders; working with Croda personnel, the release was contained by approximately 11 p.m.
Investigations by Croda, Inc. determined that the release was caused by a failed flange gasket on the water reboiler (“E-430”) piping servicing the purification column (“T-430”). The gasket used was of a material not suitable for the operation. The investigation of the release by the Department of Natural Resources and Environmental Control (DNREC) confirms these findings.
The Delaware Memorial Bridge was closed to traffic as a precautionary measure due to the potentially hazardous nature of ethylene oxide, which is flammable and toxic. The bridge was cleared to be reopened at approximately 11:05 p.m. after the release had been stopped. The decision was made by the Incident Commander and supported by DNREC.
A call was sent out through the Delaware Emergency Notification System (DENS) to advise residents in the nearby area to shelter in place, under an abundance of caution. The Incident Commander directed the New Castle County 911 Center to send the call to areas designated by the Incident Command Team of Holloway Terrace Fire Company and DNREC. The New Castle County Office of Emergency Management sent the call to Swanwyck, Swanwyck Estates, Castle Hills, Buttonwood, and Collins Park communities. The system reported that 3,703 people were called and got through on 1,744 phone numbers, reaching 1,050 people. Individuals who had signed up their cell phone numbers for DENS were included in the universe.
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The Incident Commander, consulting with public safety officials onsite, made the determination based on the conditions on the ground at the time.
No injuries to plant personnel, responders or nearby residents have been reported. Five plant personnel sought medical observation in the week after leaving the facility. Four of the five were evaluated and released immediately, while a fifth person was held for 72 hours of observation as a precautionary measure.
According to the Delaware Department of Health and Social Services (DHSS): The reported level of the chemical from onsite monitoring is below levels that could be applied to characterize risk of health effects. Further, the compound is one that would be expected to disperse and break down relatively quickly once released into the atmosphere. Any risk to the public would have decreased significantly, if not completely, shortly after the end of the release – this is not a scenario that we would expect any lingering or long-term effects.
The DNREC Site Investigation and Restoration Section (now known as the DNREC Remediation Section (RS)) required an investigation to determine the impact of the EO release that occurred on November 25, 2018. During the week of January 22, 2019, soil and groundwater sampling in accordance with the January 3, 2019 DNREC-SIRS-approved sampling plan, took place. All of the samples were collected along the Site’s eastern property boundary, which is closest to, and topographically in the direction of the Delaware River. On March 8, 2019, the results and summary of the January 22, 2019 sampling event were submitted to the DNREC-SIRS.
DNREC-SIRS reviewed the Soil and Groundwater sampling results submitted electronically on March 8, 2019. Ethylene Oxide was not detected in any soil sample or the groundwater sample above the laboratory method detection limits. 1, 4-Dioxane, was detected in two of nine soil samples and in the groundwater sample, and was a known site contaminate prior to the EO Sampling investigation. The reported concentrations, locations of the detections, and the Site’s past detections of 1,4-dioxane do not indicate that the November 25, 2019 EO Release was the source of the detected 1,4-Dioxane. Furthermore, the reported concentrations of 1, 4-Dioxane in the soil samples collected during the week of January 22, 2019 are below DNREC-RS’ strictest screening criteria. Based on the groundwater sampling conducted, the reported groundwater concentration of 1, 4-dioxane was 1/10 of an unacceptable risk levels under the current site use and would not present a risk to site workers, the public or the environment.
Therefore, based on the results of the January, 2019 soil and groundwater investigation, and subsequent review of the data generated, the EO release of November 25, 2018 does not present a risk at the site. Since no exceedances were noted at the property boundary, and the concentrations of the contaminants do not exceed the DNREC RS acceptable screening values set forth in Notice of Administrative Penalty Assessment and Secretary’s Order No. 2019-A-0014, the DNREC-RS will not be requiring Croda any further investigation into the November 25, 2019 Ethylene Oxide Release. The March 8, 2019 investigation report has been accepted as Final and will become part of the public file.
As noted above, DNREC-RS actively investigated any site worker, public and environmental impacts as a result of the release by performing a soil and groundwater investigation at the Site eastern property boundary. No exceedances were noted at the property boundary, and the concentrations of the contaminants do not exceed the DNREC Remediation Section’s (RS) acceptable screening values set forth in Notice of Administrative Penalty Assessment and Secretary’s Order No. 2019-A-0014. Therefore, the DNREC-RS will not be requiring Croda any further investigation of the soil and groundwater resulting from the November 25, 2019 Ethylene Oxide Release.
Croda’s EO Plant remains shut down. DNREC’s Accidental Release Prevention Program (ARP) is requiring that all of the following be completed by Croda, Inc. prior to obtaining approval from DNREC to restart the EO plant.
DNREC has completed an initial investigation into the cause of the release. The soil and groundwater investigation was completed and the final report was approved on March 8, 2019.
Croda has estimated that 2,688 lbs. of ethylene oxide was lost in the release. The investigation of the release by DNREC confirms these estimates.
No, the release involved ethylene oxide that was inside processing equipment.
DNREC does not regulate the chemicals themselves. For set amounts (called “threshold” amounts) of extremely hazardous substances, we review processing equipment to ensure it is in proper working order, including alarms and back-up systems. We also inspect storage areas, review response plans, and review training records of staff who are responsible for handling the chemicals on-site.
Besides DNREC, OSHA is reviewing the incident.
Ethylene oxide is used to make surfactants – short for surface-acting agents – which are used by other manufacturers to make a variety of consumer products, as well as processed into ethylene glycol, an ingredient in plastic polymers and antifreeze.
The Accidental Release Prevention Program conducted a site visit on August 13, 2019.
Based on the results of the investigation, the use of an improper flange gasket in the construction of the EO Plant was the cause of the release on Nov. 25, 2018. Throughout the incident, a water deluge system was used to minimize the ambient air concentration of ethylene oxide and to minimize the risk of explosion or ignition of the released ethylene oxide.
The Department has determined that Croda, Inc. has violated 7 Del.C. Chapter 60, 7 DE. Admin. Code 1102 and Permit APC-2016/0068-CONSTRUCTION (Amendment 3) as follows:
The Department has determined that Croda, Inc. has violated 7 Del.C. Chapter 60, 7 DE. Admin. Code 7201 and Permit NPDES DE0000621 as follows:
The settlement agreement between DNREC and Croda, Inc., includes a DNREC Secretary’s Order issued on March 4, 2019, citing Croda for Division of Air Quality violations for the EO release and for the improper maintenance and operation of the Atlas Point facility. DNREC’s Division of Water cited Croda for the unpermitted release of deluge water in violation of its NPDES (National Pollutant Discharge Elimination System) permit. The settlement agreement also directs Croda to pursue a plan of sampling and remediation, pursuant to HSCA (the Delaware Hazardous Substance Cleanup Act), administered by the Division of Waste and Hazardous Substances’ Site Investigation and Restoration Section (SIRS). Through the settlement, DNREC Secretary Shawn M. Garvin issued a Notice of Penalty Assessment and Order to Croda, Inc., for the violations of Delaware air quality regulations and the company’s NPDES permit. The Secretary’s Order assesses a penalty of $246,739 to Croda, which includes $16,489 for DNREC cost recovery from responding to and investigating the incident. The settlement, including the Order and penalty assessment, can be found on the DNREC website at dnrec.alpha.delaware.gov/secretarys-orders/. The Department anticipates that additional costs will be incurred in the future in monitoring testing, compliance, and remediation, and the Department reserves the right to recover any such additional costs. Through the settlement agreement, the Department also reserves the right to take additional enforcement regarding these and other violations by Croda.
Members of the public can register for alerts from the DEN system on the DEMA website.
The Atlas Point facility has been in its current location since 1937 (81 years). Croda purchased the facility in 2006. The Delaware Memorial Bridge was built in 1951.