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WEI` <br /> Results of Initial Investigation and Work plan <br /> ARCO Service Station iVo. 764, Lodi, December 18, 1990 <br /> California AOS 38048-4 <br /> nclrrsior� <br /> Laboratory results indicate that soil containing waste oil is restricted to depths less than 25 <br /> feet below grade in boring B-1 and between 10 and 15 feet below grade in borings B-2 and. <br /> B-3. The lateral extent of waste oil in soil was not defined south of the former waste-oil <br /> tank cavity. Laboratory analysis of a soil sample from 20 feet below grade in b <br /> � detected total oil and grease at 58 ppm;in oorrng B�•1 <br /> Our Opinion, this sample delineates waste oil in <br /> soil east of the former tank cavity, <br /> Based on the results of our field investigation and laboratory analyses, we conclude tha <br /> gasoline hydrocarbons do nota t <br /> ppear to be present in the soil around the perimeter of the <br /> existing tank cavity or in area of the proposed tank cavity in concentrations that warrant <br /> remediation. However, gasoline is present in soil near the former waste-oil to <br /> 20 and 35 feet below rade n1c between <br /> near borings B-1 and B-2 and extends below 25 feet be <br /> tank cavity. low grade <br /> in boring $-3 Oro water should not be encountered during the excavation of either <br /> PROPOSED VLro - e! <br /> The proposed work is designed to remove soil q- /J'-) <br /> containing hydrocarbons, T� <br /> base of the tank cavities within the safe limits of the operating equipme t and withfrom the <br /> respect <br /> to sidewall stability and the surrounding structures. Excavation will be terminated before <br /> or at the first encounter of ground water. This work will be conducted in accordance with <br /> the following three regulatory documents: (1) Regional Board Staff Recommendons for <br /> ati <br /> Initial Evaluation and Investigation of Underground Tanks,Tri-Regional Recommendations <br /> (California Regional Water Quality Control Board [CRWQCB <br /> ns for Initial Evaluation and InvestMay 1989); (2) Regional <br /> gation of Underground <br /> Board Staff Recommendatio <br /> 11 <br /> —APP11ed GeoSys1ems ----� <br />