Treated affluent from Clyde Mine discharging into Tenmile Creek, Greene County, PA.
MORGANTOWN, W.Va. – Additional testing by the West Virginia Water Research Institute (WVWRI) at Clyde Mine on Tenmile Creek shows acceptable radium levels in drinking water.
Tenmile Creek is the primary watershed within Greene County Pennsylvania, passing through Waynesburg before joining the Monongahela River in Clarksville, Pennsylvania.
“We looked hard and just could not find any evidence of harmful radiation levels,” said Dr. Paul Ziemkiewicz, director of the WVWRI.
WVWRI sampled the Clyde Mine discharge on Tenmile Creek six times over a two-week period beginning in late July to make sure the results were representative. That data showed that the highest minimum detectable concentration (MDC) of alpha radiation was 2.95 pCi/L, while the drinking water limit is 5 pCi/L. The reported values averaged 0.74 pCi/L.
In April 2014, sSampling done by the Pennsylvania Department of Environmental Protection (PADEP) in April 2014 indicated high levels of radium in discharges to Tenmile Creek from the abandoned Clyde Mine and coal refuse piles farther upstream near Waynesburg and another at the Cumberland Mine on Whiteley Creek.
“The radium numbers were high but not consistent with the much lower gross alpha radiation readings,” said Ziemkiewicz. “Radium is an alpha emitter and the gross alpha reading should be the sum of all of the alpha emitters.
Ziemkiewicz said there were to other problems with the data.
“It wasn’t clear from the 2014 PADEP data which analytical method was used to determine radium concentrations, and the MDC were not provided,” he said. “MDC tells you the lowest data value that can be reported with confidence. For example, if the MDC is 100 all you can say is that the actual value is somewhere between zero and 100.”
Ziemkiewicz explained that if the reading is 50 and the MDC is 100 you still can only say that the actual value is somewhere between zero and 100.
“This is extremely important to remember when evaluating radiochemical results,” he said. “When we saw these inconsistencies we decided to resample and reanalyze using approved EPA methods. We guessed that PADEP determined radium by gamma spectroscopy.”
According to Ziemkiewicz, that method is used mainly as a screening tool for solid wastes.
“It’s cheap but not very precise when used for water samples,” said Ziemkiewicz. “It may be the best method for undiluted Marcellus flowback water where interfering ions like strontium and barium measure in the thousands of milligrams per liter. But the Clyde mine discharge had zero barium and only 6.6 milligrams per liter of strontium, so interference is not an issue. That’s why we used the more precise radiochemistry methods.”
In June of this year, WVWRI sampled the same sites that PADEP had sampled in 2014 and sent the water samples to PACE Analytical Services in Greensburg, Pennsylvania, for analysis. PACE is a state-certified radiochemistry lab. The radium results came in well below EPA drinking water levels.
The only parameter that was close to the drinking water limit was gross alpha, which was 13.4 pCi/L. The drinking water limit is 15 pCi/L. However, the total dissolved solids were high in this sample. So in addition to EPA method 900.0, WVWRI asked PACE to use EPA method 7110C, which is recommended for high-total dissolved solids water.
Providing research data for residents
Funded by the Colcom Foundation, the WVWRI’s Three Rivers QUEST (3RQ) REACH program provided the means to initiate this targeted study for radiologicals on Tenmile Creek in response to residents’ concerns.
The 3RQ program brings together academic researchers with grassroots organizations by collecting field water-quality data and information from local water monitoring groups that are in tune with the health of their local watersheds.
“Several watershed organizations have been monitoring along Tenmile Creek. When their field instruments suggest something unusual we can respond with more detailed chemical analysis. Testing for radiologicals is expensive and beyond the means of most citizens,” said Melissa O’Neal, 3RQ project manager. “Results from this targeted study provide reliable data to local residents who are concerned about the quality of their streams.”
The 3RQ program has been monitoring the mouth of Tenmile Creek since 2009 for a suite of chemical parameters. Results from WVWRI and its partner grassroots water monitoring organizations is shared with the public on the program’s website, 3RiversQUEST.org.
CONTACT: Andrew Stacy, West Virginia Water Research Institute