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Peters Kwikee Food Preliminary Site Assessment Report = _ Project No.01-46.1.1 22 June 1990 Page 3 4.0 CONCLUSIONS AND RECOMMENDATIONS The data presented above suggest that a release of hydrocarbons may have ocurred from the UST at this site. However, without additional work, the full extent of the problem can not be evaluated. There may only be a small plume adjacent to the UST or there may be a large plume that has migrated some distance from the tanks. Or the hydrocarbons may have migrated from adjacent sites. Geological Technics recommends that at least 3 more monitoring wells be installed and that the site be monitored on a quarterly basis for ground water quality and gradient for a period of one year. At the end of a year, the monitoring data would be reviewed and a future course of action proposed. S.o QUALITY ASSURANCE PROGRAM The following measures will be taken by Geological Technics to insure that a high quality study is conducted and that cross contamination does not occur. Soil borings were drilled with a 6 inch (i.d.) hollow stem continuous flight auger, owned and operated by Osterberg and Stewart, Inc. Soil samples were collected using a 2 inch (o.d.) modified California split spoon sampler lined with brass sample tubes. 5.2 Boring Logs Detailed logs were made of each boring. The information gathered includes: sample depths, blow counts, horizons of detectable contamination (using field methods), soil classification utilizing the Unified Soil Classification System and sediment description (color, texture, composition, hardness, moisture content, and post-depositional changes that have occurred in the sediments). i 5.3 Soil Sampling S One soil sample was analyzed from the monitoring well. Brass sample tubes were sealed with aluminum foil, capped, labeled and immediately refrigerated for