Demolition of the gas supply area at the Indianapolis Coke Plant site was completed in August 2012. As an exact timetable for future demolition phases is developed, it will be shared with the community.
The safety of residents living near the plant and the safety of workers at the site will again be top priorities when demolition activities resume. Citizens has plans in place to ensure the demolition activities will not adversely impact the local neighborhood and the environment. As we did during the initial demolition activity, Citizens will be working with the Indiana Department of Environmental Management to monitor air emissions and other potential environmental impacts during the demolition work. Below is environmental monitoring data from the gas supply area demolition:
Odor Control Plan
Dust and Noise Control Plan
Dust and Odor Control Log
Air Monitoring Data
Frequently Asked Questions - Demolition
Q. What is the current timeline for the demolition?
A. Our current plans are to continue demolition activities using a phased approach thru 2016. Citizens will keep the community informed as we develop an exact schedule for the next phases of the demolition.
Q. How has Citizens responded to the odor at the site of the gas holder demolition?
A. The odor problem at the gas holder site did not appear until the onset of record high temperatures and humidity in late June and early July. For the previous six weeks, there had been no complaints about odor at the site. We did anticipate that odor problems could result from the demolition and we were prepared to deal with them.
Once we received the complaints of the significant odors, we responded by investigating possible activities associated with demolition that may be contributing to the odor and we found a solution to contain the compounds that we believe to be driving the odor. We believe that the stretch of unusually high temperature in July allowed the compounds driving the odor to volatilize, much as paint does when it dries. Our primary solution has been to apply a foam suppressant that is designed to coat the exposed surfaces and reduce the likelihood of this volatilization. And it appears the foam is working.
Q. What air quality monitoring was done before demolition started? What air quality monitoring is currently taking place and will it continue during subsequent phases of the demolition?
A. Citizens included provisions for control of nuisance odors and dusts in its demolition workplans. Citizens implemented its fugitive dust control plan as part of all its demolition work as soon as it started and that plan effectively reduced dust emissions from the site. Citizens purged and cleaned all vessels (including the Gas Holder) before demolition to minimize odors. However, odors became a concern during the extremely hot and dry weeks in July. When the first odor complaint was received in mid-July, the Marion County Health Department responded and found no cause for concern.
Nonetheless, Citizens developed and implemented an Odor Control Plan which included amended work practices, air monitoring and continued improvements to control odors
Citizens intends to continue daily and weekly air quality monitoring throughout the completion of this phase of demolition to ensure that levels remain below those identified by the regulatory agencies.
For future phases of demolition, Citizens will consider ambient air quality monitoring prior to demolition, as well as on-going throughout the phases, with the frequency of the monitoring driven by the results.
Q. What chemicals caused the smell at the site of the demolition of the gas holder and do they pose a danger to our health or the environment?
A. We are continuing our analysis of our air monitoring results and relevant standards and have the following observations/recommendations:
- We have performed and continue to perform air monitoring in and around the Gas Holder site.
- Air monitoring consists of continuous daily monitoring for Total Organic Vapors (TOVs) using a portable Photoionization Detector (PID). PID readings are recorded routinely throughout the day from a single background location and five locations in and around the former Gas Holder. Areas where high PID readings are observed are subject to additional odor control measures such as application of additional odor suppressing foam. The highest PID reading recorded at the Gas Holder site was 1.3 parts per million (ppm). PID readings do not reveal what chemical constituent is contributing to the reading only the total amount of vapors in the area.
- Air monitoring also consists of collection and analysis of air samples for laboratory analysis which can identify specifically what chemical constituents are detected in the air in and around the Gas Holder. This sampling has confirmed what Citizens has expected - that naphthalene is present in the air samples from the Gas Holder area. The highest level of napthalene recorded was from a sample collected before implementation of the Odor Control Plan at a concentration of 350 ug/m3. Since the Odor Control Plan has been implemented, no sample has reported napthalene concentrations exceeding 140 ug/m3.
- Napthalene has a very low odor threshold. In the laboratory, napthalene odors have been noticed in concentrations as low as 10 parts per billion (50 ug/m3).
- There are no State of Indiana, USEPA or OSHA standards that apply to the monitoring that has been done and will continue to be done at the site.
- OSHA allows has established a workplace standard for napthalene of 50,000 ug/m3 which is over 100 times greater than the highest concentration recorded near the Gas Holder.
- The State of Wisconsin and New York have guidelines for air monitoring associated with Manufactured Gas Plant (MGP) remediation. Wisconsin sets action levels for PID readings ranging from 0.1 to 1.0 ppm while New York sets an action level of 5 ppm for PID readings. There have been two instances of PID readings in excess of 1 ppm and none greater than 5 ppm. Both of these reading were measured when the temperature was 95 degrees or grreater. In both instances additional foaming reduced the PID readings to below 1 ppm. No detectable PID readings have been observed when the air temperatures are in the 80’s.
- Only the State of Wisconsin has guidelines which specify action levels specifically for napthalene. The Wisconsin guidelines have an action level of 105 ug/m3 for napthalene over a 24-hr sampling period. Citizens tests were conducted over an 8-hr sampling period while the demolition work was proceeding. Extrapolating the data from the Citizens 8hr-tests for a 24 hr period would yield a result below the Wisconsin action level. Citizens is currently performing a 24 hr test to verify this extrapolation.
- The State of Wisconsin also has guidelines which specify action levels for benzene. The Wisconsin action level for benzene is 32 ug/m3 over a 24-hr sampling period. No 8 hr sample collected by Citizens exceeded this level.
Q. What kind of noise will people notice?
A. Neighbors will notice some noise from various construction equipment. Efforts are being made to minimize noise.
Q. Will there be any street closures?
A. We do not anticipate any street closures in the current phase of the demolition.
Q. Will there be increased truck traffic as result of the demolition?
A. Yes. Trucks will be utilized to remove steel, brick and other construction materials from the site.
Q. Will explosives be used?
A. No explosives will not be used during the current phase
Q. Will there be a lot of dust from the demolition and how will it be controlled?
A. The contractor has implemented a plan to minimize dust at the site.
Q. Who is the contractor for the work?
A. O’Rourke Wrecking of Cincinnati is the contractor. The contractor plans to use local trucking firms and other local companies as appropriate.
Q. Where do the bricks and other construction materials go after demolition?
A. Scrap metal debris from the demolition will be recycled; to the extent that bricks and other debris can be recycled, they will. Debris that cannot be recycled will be managed at a properly permitted landfill.
Q. When demolishing the holder and other buildings, how will we prevent the benzene from escaping to homes and land in the neighborhood?
A. The gas holder and other process vessels at the plant were cleaned and purged as part of the plant decommissioning in 2007-2009.