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Work Plan for Re-excavation May 3, 1989 <br /> Former Texaco Service Station, Manteca, California AGS 38053-1 <br /> locations are shown on Plate P-2. Hvdrocarbon�-vapor <br /> sample _ <br /> levels in the soil samples will be characterized using an organic <br /> vapor monitor (OVM) . The OVM measures hydrocarbon levels in the <br /> ambient air or headspace above the brass sample sleeve. As such, <br /> OVM-measured hydrocarbon levels are semiquantitative and may not <br /> correlate directly with levels measured by laboratory analysis. <br /> If hydrocarbon contamination is detected in the soil samples <br /> collected beneath the former location of the underground product- <br /> delivery lines, soil with positive OVA readings will be excavated <br /> and stockpiled onsite and remain the responsibility of the <br /> property owner. Soil samples will be collected at the limits of <br /> the excavation to analyze for contaminants in the base and <br /> sidewalls. it is not currently anticipated that further <br /> excavation will be necessary after removal of the underground <br /> product-delivery lines. <br /> The samples will be collected by driving a hand-o d <br /> _percussion sampler fitted with a clean brass sleeve into the soil <br /> immediately after it is brought to the surface in the excavator <br /> bucket. The sleeve will be removed from the sampler, analyzed <br /> with an organic vapor meter, and sealed with aluminum foil, <br /> plastic caps, and tape. The sample will then labeled and quickly <br /> placed in iced storage. A Chain of Custody Record will be <br /> 10 <br /> `� A,4011e4F Geo:ystems <br />