Operators of the Tammah tent hotel on state land in Teton County have resolved a septic system violation, Wyoming water quality regulators said Friday, but the source of groundwater pollution remains a mystery.
The Wyoming Department of Environmental Quality said the development near Teton Village has corrected deficiencies outlined in an Oct. 29 violation order. High ammonia levels in a monitoring well led regulators to inspect a sand mound septic system for the resort’s 11 fabric-covered geodesic domes.
Regulators found water leaking from a raised leach field. A clay layer beneath the sand mound caused the leak at Tammah, the DEQ said in Friday’s notice of compliance.
Tammah’s parent company, Utah-based Basecamp Hospitality, “implemented corrective actions that addressed the underlying confining [clay] layer so that treated effluent can now infiltrate into the ground as the system was designed to do,” the DEQ stated.
“The cause of elevated ammonia in the groundwater monitoring well is currently unknown.”
DEQ notice
The DEQ hasn’t determined, however, the source of the pollution in a Tammah monitoring well. It cleared the resort to resume operating the septic system after Basecamp produced groundwater samples from between the septic system and the polluted monitoring well.
“The cause of elevated ammonia in the groundwater monitoring well is currently unknown,” the notice states. “[T]he Basecamp septic system has been ruled out as the source,” DEQ wrote.
Wyoming officials authorized the hotel, sued to prevent Teton County from inspecting it, and now continue to investigate the pollution it has uncovered on state school trust land. Teton County leaders want to know more about the probe.
“I don’t have a comment until DEQ has released the data, including the background monitoring results, and independent water quality scientists have an opportunity to review that data,” Teton County Commission Chairman Luther Propst said.
Dan Heilig, a representative of Protect our Water Jackson Hole, agreed, saying he wouldn’t comment “until we are able to independently verify the data, study protocols and other records that led them to make this determination.”
The yearslong debate over the glamping complex, constructed near a wetland despite protests in Teton County, intensified with the discovery of the monitoring well pollution.
The well produced a sample on May 15 that showed the groundwater at Tammah was within standards for the Class 1 Fish Creek watershed. By the end of the month, Tammah was open for business and collecting monitoring samples every quarter as required by a state permit.
In September, samples from the well showed ammonia levels above state standards. A second sample in October found even higher readings.
DEQ ordered the system shut down and said human waste had to be trucked away for treatment instead. Basecamp and Tammah then did more testing, according to regulators.
“Basecamp conducted additional groundwater sampling, taking a sample from a location between the sand mound septic system and the groundwater monitoring well with elevated ammonia,” the DEQ notice stated. “The sampling results indicate the sand mound system is not the cause of the elevated ammonia levels.”
The agency will continue to look for the source of the pollution, it said.
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