gila river boundary site
DESCRIPTION
Presentation on best practives for bioremediation of organochlorine pesticide sitesTRANSCRIPT
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….