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Type II Work Plan - Addendum <br />UXO Construction Activities and Soil Removal Action <br />Preliminary Assessment/Site Investigation Update <br />California Army National Guard Facility <br />Stock/on, California <br />Contract No. GS-00E-007L/Task Order W91238-05-F-0084 <br />Version 2.0 <br />4.0 SAMPLE LOCATION AND FREQUENCY <br />Pre-characterization samples will comprise eight separate samples to be composited into <br />two samples for analysis. The eight samples will be collected from two borings, at two- <br />foot intervals between 8 and 15 feet bgs, or any depth with indications of staining or <br />debris. Actual sample depths will be selected based on visual observations of the soil in <br />each boring. <br />Background sampling for arsenic will comprise six samples. The six samples will be <br />collected at depths of approximately two and five feet bgs, from three borings within the <br />boundaries of the CA ARNG Stockton facility. <br />Confirmation samples will be collected from the sidewalls and bottom of the soil <br />excavation. Sample collection will be performed at a rate of one sample per 20 linear <br />feet of sidewall with a minimum of one sample per sidewall, and one sample per 100 <br />square feet of excavation bottom. <br />104700.4965.300 Page C FSP-5 April 2007