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Case Closure Summary <br />Site Name: Ricoh Electronics <br />Case # 033000552T <br />TREATMENT AND DISPOSAL OF AFFECTED MATERIAL <br />Material <br />Amount <br />Action (treatment, disposal)/ <br />Destination <br />Date <br />Soil <br />Unknown <br />Excavated and disposed off -site <br />July —Sept. 1998 <br />Soil <br />Unknown <br />Excavated and disposed off -site <br />Sept. 2006 <br />Groundwater <br />2, 160,000 gallons <br />Extracted and treated using GAC <br />Aug. 1988—May 1999 <br />Isopar <br />4,371 gallons <br />Extracted and disposed off -site <br />Feb, 1988—May 1992 <br />Excavation Water <br />100,000 gallons <br />Extracted and treated using GAC <br />July —Sept. 1998 J <br />Ill. Release and Site Characterization Information (Continued) <br />Maximum Documented Contaminant Concentration -Before and After Cleanup <br />Contaminant <br />Soil (mg/kg) <br />Groundwater(ug/l) <br />1986 <br />1998 <br />2006 <br />2008 <br />Nov. <br />1986 <br />March <br />1997 <br />Feb. <br />2003 <br />April <br />2005 <br />Sept. <br />2009 <br />TPH <br />1,000 <br />4,000 <br />360 (C13-28) <br />860 (C29-40) <br />490 <br />(VFH) <br />N/A <br />95,000 <br />2,100 <br />400 <br />190 (VFH) <br />660 (El <br />Free product <br />N/A' <br />N/A <br />N/A <br />NO <br />6' <br />ND' <br />NO <br />NO <br />NO <br />Benzene <br />NIA <br />N/A <br />N/A <br />0.0023 <br />N/A <br />NIA <br /><2,0 <br />N/A <br />NO <br />Toluene <br />NIA <br />N/A <br />N/A <br />0.003 <br />N/A <br />N/A <br />5.1 <br />N/A <br />ND <br />Ethyl Benzene <br />NIA <br />N!A <br />N!A <br />ND <br />N/A <br />NIA <br /><0.2 <br />N/A <br />NO <br />Xylene <br />NIA <br />N/A <br />NIA <br />NO <br />N/A <br />NIA <br /><2.0 <br />N/A <br />NO <br />MTBE <br />NIA <br />N/A <br />N/A <br />N/A <br />N/A <br />NIA <br /><5 <br />N/A <br />NO <br />TBA <br />NIA <br />WA <br />N/A <br />NIA <br />N/A <br />NIA <br /><5. <br />NIA <br />7.9 <br />Comments regarding investigation and remediation <br />In July 1986, leakage was detected from piping associated with three USTs. The USTs stored ISOPAR G (C10-C11) and <br />H (Cl1-C12), which was used in the manufacture of toner. Based on the results of a soil gas survey, four soil borings <br />were advanced at the site. TPH (C6-C8) were detected at a concentration ranging from 50 to 1000 ppm. Six <br />groundwater monitoring wells and twenty groundwater well points were installed to characterize the groundwater. <br />N/A —Not Analyzed <br />s ND — Not Detected <br />75C-103 <br />