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WZ1 INC <br /> April 6, 1989 sampling are presented in Table 1 Laboratory reports and chain-of-custody <br /> documents have been previously submitted by McLaren, 1989a <br /> The 45 cubic yards of petroleum hydrocarbon-contaminated soil was aerated onsite in <br /> accordance with permission from San Joaquin Valley Unified Air Pollution Control District <br /> At the conclusion of aeration, the remediated soil was left on site (McLaren, 1989a) The <br /> excavation where the tank was removed was backfilled with clean soil and compacted to <br /> grade in order to stabilize the area for future winery expansion <br /> 33 Site Assessment Workplan <br /> Sebastiani Vineyards retained McLaren Environmental to develop a workplan and conduct <br /> a site assessment investigation to determine the horizontal and vertical extent of soil and <br /> groundwater petroleum hydrocarbon contamination at the site The initial approach <br /> proposed by McLaren to investigate the site included the following tasks <br /> 1 The drilling and completion of three exploratory soil borings around the former <br /> tank site and collection of grab samples from the groundwater These samples <br /> were to be analyzed for total petroleum hydrocarbons as gasoline (TPH-G) using <br /> EPA Test Method 8015 (modified) and aromatic volatile organics (VOA) using <br /> EPA Test Method 8020 <br /> 2 If analytical laboratory results from the samples were found to contain petroleum <br /> hydrocarbon contamination, the borings would be completed as four-inch <br /> monitoring wells If significant petroleum hydrocarbon contamination was not <br /> encountered in the groundwater, the borings were planned to be completed as <br /> two-inch diameter monitoring wells <br /> 3 Soil samples were to be collected from each exploratory soil boring at a minimum <br />,18 of five-foot intervals At least two of the soil samples from each boring were to <br /> be analyzed for TPH-G using EPA Test Method 8015 (modified) and for volatile <br /> organic compounds using EPA Test Method 8020 <br /> 19150011005 10 <br />