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Case Closure Summary <br />Site Name: Ricoh Electronics Case # 083000552T <br />TREATMENT AND DISPOSAL OF AFFECTED MATERIAL <br />Material Amount Action (treatment, disposal)1 Date <br />Destination <br />Soil Unknown Excavated and disposed off-site July -Sept. 1998 <br />Soil Unknown Excavated and disposed off-site Sept. 2006 <br />Groundwater 2,160,000 gallons Extracted and treated using GAC Aug. 1988 -May 1999 <br />Isopar 4,371 gallons Extracted and disposed off-site Feb. 1988 -May 1992 <br />Excavation Water 100,000 gallons Extracted and treated using GAC July -Sept. 1998 <br />III. Release and Site Characterization Information (Continued) <br />Maximum Documented Contaminant Concentration -Before and After Cleanup <br />Contaminant Soil (mg/kg) Groundwater (ug/l) <br />1986 1998 2006 2008 Nov. March Feb. April Sept. <br />1986 1997 2003 2005 2009 <br />TPH 1,000 4,000 360 (C13-28) 490 N/A 95,000 2,100 400 190 (VFH) <br />860 (C29-40) (VFH) 660 (EFH) <br />Free product N/A 1 N/A N/A ND 6' ND 2 ND ND ND <br />Benzene N/A N/A N/A 0.0023 N/A N/A <2.0 N/A ND <br />Toluene N/A N/A N/A 0.003 N/A N/A 5.1 N/A ND <br />Ethyl Benzene N/A N/A N/A ND N/A N/A <0.2 N/A ND <br />Xylene N/A N/A N/A ND N/A N/A <2.0 N/A ND <br />MTBE N/A N/A N/A N/A N/A N/A <5 . N/A ND <br />TBA N/A N/A N/A N/A, N/A N/A <5 N/A 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 (C1 0-C11) and <br />H (C11-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 />1 N/A -Not Analyzed <br />2 ND -Not Detected <br />2