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`mss <br /> PHASE ONE <br /> ENVIRONMENTAL <br /> ADDENDUM TO WORK PLAN <br /> for <br /> Vadose Zone"Site Characterization <br /> Former Union Tanks - Cutter Lumber <br /> 3422 & 3430 & El Dorado <br /> Stockton, California „ <br /> November 18, 1996 <br /> Project No. 102.2 <br /> INTRODUCTION <br /> The following Section 4.0 is intended to replace the section of the same designation in the <br /> original Work Plan dated October 8, 1996 <br /> 4.0 PROPOSED INVESTIGATION <br /> In order to help assess whether the former tanks may have impacted the water well, the <br /> following work is being proposed by the Bank of Stockton. <br /> 1. Use hollow stem auger drilling equipment to install a total of 8 soil borings to a <br /> depth sufficient to penetrate the capillary fringe zone (about 35 feet). The borings <br /> will be logged and soil samples will be collected for laboratory analysis to help <br /> define the lateral and vertical extent of petroleum hydrocarbons in the vadose zone. <br /> The proposed locations of the borings are designed to investigate the area in the <br /> immediate vicinity of the former gasoline UST, the domestic water well, and in the <br /> suspected down-gradient direction of groundwater flow. <br /> 2. The domestic water well will be permanently abandoned by completely pressure <br /> grouting it with a sand /cement slurry. <br /> 3. The information gathered from the soil borings will be used to help assesses the <br /> necessity and extent of a possible soil excavation that may be proposed for the <br /> r <br /> 1 <br />