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501L ASSESSMENT RELATED TO n <br />REMOVAL OF UNDERGROUND TANKS <br />SHELL SERVICE STATION <br />Nps 2? <br />620 WEST CHARTER WAY <br />STOCKTON, CALIFORNIA <br />DELTA PROJECT NO. 40-88--586 <br />1.0 INTRODUCTION <br />,-'fad <br />CSV U u?U, �, ✓r�� <br />PE[�MJT/ Ef? L JC S LTH <br />Delta Environmental Consultants has been authorized to conduct an assessment to evaluate the <br />distribution of petroleum constituents (if present) in soils beneath a Shell Service Station at 620 West <br />Charter Way in Stockton, California The assessment is being conducted prior to excavation and <br />removal of existing underground storage tanks and installation of new tanks <br />The assessment is intended to determine whether soils surrounding the existing tanks contain <br />petroleum constituents If petroleum constituents are present, the assessment will allow for an <br />estimate of the volume of soils that would be removed during tank placement activities and require <br />treatment to reduce petroleum constituent concentrations to acceptable levels Upon removal of the <br />existing tanks, soil samples will be collected from below the tanks and submitted to a state-cert,faed <br />laboratory for analysis, as required for tank closures <br />1 l _ Purpose <br />The pre -tank pull soil assessment will be undertaken to <br />o Determine if sods adjacent to the existing tank basin contain detectable concentrations <br />of petroleum constituents <br />o If the soils do contain petroleum constituents, determine the distribution and extent <br />of these constituents <br />o Determine if soils in the area of the new tank basin contain detectable concentrations <br />of petroleum constituents <br />o Evaluate the need for additional investigation <br />l 2 Scope of Work <br />To accomplish these objectives, the following work is proposed <br />0 Advance exploratory soil borings with a hollow -stem auger drilling rig <br />