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Type 11 Work Plan - Addendum <br />UXO Construction Activities and Soil Removal Action <br />Preliminary Assessment/Site Investigation Update <br />California Army National Guard Facility <br />Stockton, California <br />Contract No. GS-00E-00711Task Order W91238-05-F-0084 <br />Version 2.0 <br />The northwest anomaly was excavated to a depth of four feet bgs, and the excavated <br />material checked thoroughly for debris. No buried objects were detected. <br />The northeast anomaly was excavated to a depth of seven feet bgs. A metal <br />grounding/hold-down strap was unearthed and was removed. <br />During May 2006 a geophysical investigation was performed at the south excavation. A <br />report of the findings of the geophysical investigation (Versar, 2006) identified the <br />potential extent of buried material associated with the former suspected CS (tear gas) <br />excavation. <br />The findings of the report identified two anomalies in the unconsolidated fill west of the <br />former excavation. Please note that the layout of the anomalies is based on two <br />dimensional mapping. The length and depth are indicated in the Geophysical Report, but <br />the width of the anomalies is estimated. Based on these data, Versar estimates between <br />300 and 400 cubic yards (bank yards) of potentially contaminated soil and debris may be <br />present. <br />104700.4965.300 Page C FSP-2 April 2007