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D the city, Alachua County environmental agency, and the Florida Department of Environmental ProtectionP, with participation by ECT. The total cost for Task 4 was $134,343. RAPs were also prepared for separate phases of the project. Under Task 5, the cost to complete was $254,838. Under Task 6, remediation, the first phase consisted of excavation and remediation of soils and contaminated groundwater associated with the • Akira Wood site. Coal tar impacted soils (1,914 tons) were removed and transported to an approved landfill. Contaminated groundwater (188,000 A . gallons) was disposed of in the city's wastewater treatment plant (WWTP). `�•` During the next phase, 4,856 tons of petroleum-contaminated soils andFgli al- 100,000 gallons of groundwater were removed and treated. The t�Cc�• �` �1 groundwater treatment system consisted of sand beds followed by activated carbon. During the next phase, excavation of the westernmost . - - �r stormwater basin, a total of 5,700 tons of soil contaminated with petroleum and coal tar residues were transported and disposed of at an approved Contamination assessment landfill. Over 9 million gallons of contaminated groundwater was treated onsite by sand filtration and activated carbon prior to disposal in the city's WWTP. Task 6 work was completed in 2006 for $511,902. Under Task 7, the RAP for the next phase was submitted to the State for approval. This plan called for the excavation of petroleum- and coal tar-contaminated soils followed by onsite thermal treatment. It was estimated that 170,000 tons of soil would need to be treated. Contaminated groundwater at the site was proposed to again be treated by sand filtration and activated carbon system. A National Pollutant Discharge Elimination System permit was prepared and obtained for discharging a portion of the treated effluent to Sweetwater Branch and subsequently to Paynes Prairie. Additional effluent was planned to be discharged to the City's WWTP. It was estimated that 30 to 40 million gallons of contaminated groundwater would require treatment. $809,252 ECT subsequently initiated a pilot scale test to evaluate the effectiveness of the thermal treatment system. The pilot testing failed due to the extremely high BTU content of the contaminated soil. The treatment method proposed in the RFP was modified to include excavation and hauling to an approved landfill. ECT is currently completing remediation at the Poole ;� >•- Roofing area and to the south of Depot Avenue. The area ►• � e••=. being remediated has been excavated to a depth of 50 feet. �� • � `" The remediation area is dewatered through 106 wells • surrounding the area at a pumping rate of 300 gallons per >• ' ` '2- , minute (>432,000 gallons per day). An additional .> f•..l-- • E`'� dewatering pump has also been installed to remove excess ,• -‘••••&-;-_'z ... �'' seepage from a sump constructed in the main excavation `1!' g , area. Water recovered from the dewatering system is r e j r� f .• �' a - . t 1 sw•processed through sand filters and activated carbon prior °1,, � to discharge to Sweetwater Branch. Contaminated soils removed from the site are transported to an approved landfill for disposal. The cost of this phase, including additional remediation and lake construction to be completed south of the current site, exceeds $17,000,000. II C / PROJECT PROFILE CIUSERSUYA.\GIAPPDATA1LOCADMICROSOFT INDOWSITEMPORARY INTERNET FILFSICONTENT.OUTLOOI(IOZYSG'IQXISLINISL-PROI.DOC-0i3012