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Work Plan for Re-excavation May 3, 1989 <br /> Former Texaco Service Station, Manteca, California AGS 38053-1 <br /> together is below 100 ppm, Applied GeoSystems may recommend <br /> stopping further excavation to the west; the appropriate <br /> regulators will be contacted to discuss this recommendation. The <br /> estimated extent of the proposed excavation is shown on <br /> Plate P-2. <br /> Hydrocarbon-vapor levels in this soil will also be characterized <br /> during the tank cavity excavation using an organic vapor meter <br /> (OVM) . The OVM is used to measure hydrocarbon levels in the <br /> ambient air or headspace above the sample sleeve. As such, OVM <br /> measured hydrocarbon levels are indicative only and may not <br /> ~' =elate directly with levels measured by laboratory analysis <br /> At the completion of excavation, we estimate approximately 450 <br /> cubic yards of soil will have been removed. Soil removed by <br /> excavation will be stockpiled onsite and remain the <br /> responsibility of the property owner, subject to treatmQn t or <br /> disposal as described below. <br /> Soil samples will be collected from each sidewall and the base of <br /> the excavation. The samples will be collected by driving a hand- <br /> operated percussion sampler fitted with a clean brass sleeve into <br /> the soil immediately after it is brought to the surface in the <br /> excavator bucket. The sleeve will be removed from the sampler, <br /> 12 <br /> .4�rrp/!sd Ge®Systems J <br />