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Diesel Impacted Soil Removal Report May 2010 California Army National Guard Armory Lodi, CA 1.0 INTRODUCTION 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"). 1.1 PROJECT OBJECTIVES AND SCOPE 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, 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 a report of findings. This report is organized as follows: • Section 2—Description of the site and history related to the diesel spill; • Section 3—Activities related to diesel impacted soil removal and associated sampling; • Section 4—Findings related to pre-characterization and confirmation soil sampling; • Section 5—Evaluation of confirmation sampling data; and • Section 6—Conclusions and recommendations associated with this removal action.