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' Bank of Stockton Page 3 Site Charactertzahon-Work Plan Former Union Facility,-Cutter Lumber 3422&3440 S EI Dorado,Stockton Project No 102 2 October 7,1996 65 feet During the survey, the water between 45 feet and the surface of groundwater at ' 35 feet was totally opaque It is suspected that the casing may not be intact in this interval ' 3.0 USTCFP FUND STATUS On August 23, 1996, a letter was sent to the State Water Resource Control Board, UST 1 Cleanup Fund Program requesting that site characterization and associated remedial activities relating to the newly discovered gasoline UST be covered under the existing claim (#1878) which applies to the three tanks at the Western Lift site which is a part of ' the same Property On October 1, 1996, Mr Steve Marquez of the UST Cleanup Fund verbally informed Phase One Environmental Inc that such coverage would be granted ' insofar as it relates to the gasoline UST leak The diesel impact will not be covered because that material was stored in above ground tanks ' 4.0 PROPOSED INVESTIGATION In order to help assess whether the former tanks may have impacted the water well, the following work is being proposed by the Bank of Stockton 1 Use hollow stem auger drilling equipment to install a total of 8 soil borings to a ' depth sufficient to penetrate the capillary fringe zone (about 35 feet) The borings will be logged and soil samples will be collected for laboratory analysis to help define the lateral and vertical extent of petroleum hydrocarbons in the vadose zone ' The proposed locations of the borings are designed to investigate the area in the r immediate vicinity of the former gasoline UST, the domestic water well, and in the suspected down-gradient direction of groundwater flow 2 The domestic water well will be opened, and a temporary plug will be installed at a P P �'Y P g depth of about 50 feet The well will then be pumped dry to the top of the plug The water level will then be monitored to determine the rate at which water may be entering through the casing at levels near the top of the saturated zone ' 3 The information gathered in the soil borings will be used to help assesses the necessity and extent of a possible soil excavation that may be proposed for the ' purposes of source reduction The same data will also help determine the locations of groundwater monitoring wells 4 A report will be prepared and submitted which describes this work, its findings and implications It is expected that the report will be followed by another work plan 2937 Veneman Ave,#13240 Phase One Environmental Inc Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295