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Draft Diesel Impacted Soil Removal Report May 2010 California Army National Guard Armory Lodi, CA EXECUTIVE SUMMARY This report was prepared by Oneida Total Integrated Enterprises (OTIE) on behalf of the California Army National Guard(CA ARNG)under contract W91238-09-D-0017,Delivery Order No. 0004 with the United States Army Corps of Engineers (USACE) Sacramento District. The report describes and documents the excavation and removal of soil impacted with diesel fuel at the CA ARNG Armory at 333 North Washington Street in Lodi, California(hereinafter referred to as the"site"). The objectives for this project were to: • Delineate the lateral and vertical extent of diesel fuel impacted soil at the site and collect soil characterization samples in support of impacted soil removal and disposal; • Oversee excavation and removal of impacted soil,backfill the excavation to support its current use as an unpaved parking area, and dispose of excavated soil at a licensed impoundment with minimal disruption of the site's mission, in accordance with the December 2009 Removal Action Workplan—Diesel Impacted Soil, California Army National Guard Armory(Workplan),prepared by OTIE; • Prepare this report documenting those activities that is suitable for submittal to the interested regulatory oversight agencies,which are the Central Valley Regional Water Quality Control Board (CVRWQCB) and the San Joaquin County Environmental Health Department(SJCEHD); and • Achieve a finding of No Further Action(NFA)by the CVRWQCB and/or SJCEHD. To achieve these objectives,the scope of work consisted of: • Preparing and submitting the December 2009 Workplan,which was verbally approved by the CVRWQCB in January 2010; • Performing pre-characterization soil sampling in the diesel fuel impacted area to define the dimensions of the excavation; • Directing the excavation of impacted soils, as defined by pre-characterization soil sampling results,by a licensed excavation contractor; • Performing confirmation sampling to demonstrate that diesel impacted soils had been removed; • Overseeing the placement and compaction of clean fill within the excavation area by the excavation contractor; • Coordinating the transportation and disposal of the diesel fuel impacted soil with the excavation contractor and a licensed Class 11 impoundment; and • Preparing this report of findings. At an unspecified time prior to August 3, 2009,when the SJCEHD was notified via California Emergency Management Agency Hazardous Materials Spill Report Control#09-5417, approximately 20-30 gallons of diesel fuel reportedly spilled from a CA ARNG vehicle parked in the gravel parking area in the northwestern portion of the site. According to the notice, CA ARNG personnel partially excavated the spill,but staining remained after the removal action. The spill location was subsequently covered with plastic sheeting pending proper excavation,transportation, and off-site disposal of impacted soils.A "Notification of Hazardous Waste Discharge"report was filed on August 3,2009 with the Department of Toxic Substances Control(DTSC) and the CVRWQCB pursuant to Health and Safety Code §25180.7. In a letter dated September 30, 2009,the SJCEHD issued to the CA ARNG a"Notice to Abate Immediately"