Gila River Boundary Site

Harry Allen, USEPA OSCMike Daniel,Pat Mariella,

GRIC Dept. Env. Quality

Site

Site Location

Former Landing Strip

Site Assessment

Conducted in October 2002Toxaphene levels in soil exceeded levels considered

safe.Concentrations as great at 660 parts per million toxaphene

detected.

Pilot Studies

Pilot Studies were conducted to see if the treatment technology would work at the Site.

Small treatment pits were built to attempt treatment.May ’03 – too dryOctober ’03 – demonstrated toxaphene destruction or

“removal”

Pilot Study Results

ResultsDemonstrated 70% removal in 41 days.

Recommendations – “Recipes”U.S. EPA’s Environmental Response Team provided

“recipes” for effective treatment of toxaphene Amendment “fertilizer” will be added at a rate of 2% per total weight

of the soil being treated.

11/12/0310/02/03Date

70.95%260895Recipe 5

65.36%310895Recipe 4

73.18%240895Recipe 3

-34.08%1200895Recipe 2

36.31%570895Recipe 1

RemovalsT 41Avg. T 0

Toxaphene Bioremediation Pilot Study

Construction

Excavate and place contaminated soil in lined pits or “burritos”

Add amendments i.e., fertilizer, and mix Water and seal the burritos Estimated Costs

Estimated $700,000 in construction costs As much as $500,000 in other costs

Next Steps

How long will the project take?Construction will not exceed 6 weeks using heavy

equipment.EPA and GRIC DEQ will monitor the Site until

treatment is completed.Total treatment time will be between 3 and 8 months.

Completion

EPA will collect samples to document effectiveness of treatment.

Once treatment is completed EPA will:Cut open the liners and allow water to drainRegrade the Site if ground surface is unevenRemove all equipment from the Site

Questions?

visit the Site trailer on 51st Avenue at Komatke Lane (until last week of May)

Call 1-800-231-3075 to leave a message - we’ll call you back, or….