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During the air sampling periods spot checks of hydrocarbon levels were <br />taken using an HNu photo-ionization detector equipped with a 10.2 electron <br />volt lamp. Readings taken by IT Corporation at the landfill site generally <br />ranged from 5 to 30 ppm with one isolated 50 ppm reading. <br />Based on the above data it is concluded that there is currently no <br />apparent air quality problem at the Marina or the landfill since the <br />concentration levels of hydrocarbon constituents measured, are <br />substantially less than state limits. It is recommended however that <br />additional air sampling be undertaken during any remedial activities which <br />may have the potential of liberating volatile hydrocarbons to the <br />atmosphere. <br />4.6 Data Analysis Summary <br />Based upon the water analyses from the monitoring wells, product <br />thickness measurements and chemical analysis of soil samples, it appears <br />that recoverable product is limited to localized areas. One area appears <br />to be in the vicinity of M-9. Based upon field observations, another area <br />would be adjacent to the existing pipeline. At this time, SPPL and their <br />contractors have recovered most of the known hydrocarbon products. This <br />was accomplished through the use of recovery pits and trenches; however, <br />recove/ry operations ceased because not enough product could be skimmed from <br />the water table. Presently, the database suggests that product recovery <br />operations are unnecessary. However, additional site investigation is <br />required to assess the presence of hydrocarbons in the vicinity of M-9 and <br />also along the pipeline. The recommended site investigation program and <br />work plan are outlined in Section 5.0. <br />4-6