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tiioremediatlon of a Yesncide-l,on[aR+~nA*ea one r ~~ ^ vi .~ <br />• • <br />ATTIC CONTROL NUMBER : BT00025 <br />DATE ENTERED :: 07/30!92 <br />LAST UPDATED :07/30/92 <br />LAST REVIEWED :07/30/92 <br />TITLE : Bioremediation of aPesticide-Contaminated Site <br />PUBLICATION DATE :03/01/92 <br />NTIS NUMBER <br />GOVT. PUB. NUMBER : EPA/600/R-92/044 <br />GOVT. CONTACT: <br />GOVT. ORGANIZATION <br />DEVELOPER CONTACT : William Mahaffey <br />ORGANIZATION : ECOVA Corporation, 18640 N.E. 67th Court, Redmond, WA 98052 (206) 883- <br />1900 <br />REGION/STATE : 08/ND <br />QUALITY ASSURANCE DATA :The site characterization was not reported. <br />Sampling strategy was not reported. <br />No information provided on QA plan. <br />QA/QC results were not reported. <br />No information provided on peer review process. <br />SITE NAME(S)/LOCATION(S): Unnamed agricultural distributorship wazehouse, ND <br />SUMMARY: ECOVA managed soil and groundwater bioremediation at this pesticide-contaminated <br />site; the remediation program involved treatability evaluation, extensive material handling, soil and <br />material segregation, and the use ofsolid-phase, slurry-phase, and in situ biological techniques. Initial <br />feasibility studies were designed to establish the effectiveness of biological treatment of pesticide- <br />contaminated soils and groundwater and to identify the treatment conditions needed to maximize <br />biodegradation of the compounds present at the site. These studies showed that moderately <br />contaminated soils containing less than 200 ppm 2,4-D and MCPA court be treated in a solid-phase <br />system to reduce contamination to 10 ppm (meeting regulatory criteria) in about two weeks. Slurry- <br />phase evaluations indicated that highly contaminated soils could be rapidly treated in a slurry system, <br />reducing contaminants from approximately 13,000 ppm to 2,000 ppm in 16 days. <br />Using the treatability data, the biological treatment techniques proven effective in the laboratory were <br />implemented in the field to remediate soil contaminated with the complex mixture of herbicides and <br />insecticides. ECOVA designed and constructed an on-site five-acre, clay-lined treatment bed, and also <br />delivered mobile bioslurry and liquid-phase bioremediation units to the treatment location. The <br />treatment area was constructed with an engineered clay liner 12 inches thick and a drainage system to <br />control water movement both inside and outside the facility. 10,000 cubic yards of soil were removed <br />from the bum site and along the length of the contaminated creek and transported to the treatment <br />location. The soil was spread on the treatment bed to an average depth of I S inches. The so~7 was <br />tested for contaminant levels, sepazated according to the extent of contamination, and prepared for <br />treatment by the removal of rocks and debris. <br />http://www.epagov/bbsnrrnrUattida2BT00025.html 11/15/98 <br />