The state of Washington is planning to enter into a new legal agreement with 32 parties liable for cleanup of soil and groundwater contaminated from past operations of the Pasco Landfill.
The 32 parties include industries and governments that produced the waste, companies that trucked the waste to the landfill and people who have owned or operated the landfill, according to the Washington State Department of Ecology.
They must participate, or the state will issue an enforcement order compelling them to participate.
The legal agreement, which is in draft form now and open for public comment, calls for an in-depth study to evaluate options for cleaning up contamination. It also requires ongoing work and monitoring that the state has already approved until final cleanup actions are approved.
The landfill covers nearly 250 acres about 1.5 miles northeast of Pasco on Dietrich Road. It operated from 1958 to 2001, including accepting drums of industrial waste and bulk liquids in an industrial waste area from 1972-74.
The industrial waste included 35,000 drums of solvent, paint sludges, cleaners and other industrial waste; 5,000 drums of herbicide-manufacturing waste that were removed in 2002; 3 million gallons of bulk liquid waste, including paint, wood preservative waste and plywood resin waste; and 11,000 tons of sludge from a chlor-alkali process.
Among proposals are expanding a vapor extraction system that was installed in 1997 where the 35,000 drums are disposed. The system captures chemicals being released into the soil from the drums before they reach groundwater.
Improvements are needed for the system to work better, according to the state.
Also proposed is a better protective cover over the area where the herbicide-manufacturing waste was store. Now the area has a temporary cover.
A plume of contaminated groundwater extends nearly two miles past the southern boundary of the landfill and past A Street in Pasco.
Pasco's municipal water supply is not affected but use of well water in the area is restricted, according to the state.
Homes and business with wells potentially contaminated with volatile organic compounds from the landfill are being or will be connected to the city water system. Groundwater is routinely monitored on and off site.
Comments on the legal agreement will be accepted by the state through Sept. 19 by email at email@example.com. The also may be mailed to Chuck Gruenenfelder, Washington Department of Ecology, 4601 N. Monroe St., Spokane, WA, 99205-1295.
-- Annette Cary: 582-1533; firstname.lastname@example.org