SITE INFORMATION AND CORRESPONDENCE

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KennedOcn,s CE:�I.on Mr. Tom Terrill Reynolds and Brown 26 January 1987 Page Three 1 Undisturbed soil samples were collected at five foot intervals using a 2. 5-inch outside diameter California Modified Drive Sampler. The sampler was driven 18 inches below the bottom of f the auger bit using a 140-pound hammer which fell over a 30-inch interval . Each sampler was equipped with three 1. 5-inch diam- eter, 6-inch long brass liners for preservation and handling f collected samples. The sampler and brass liners were steam cleaned initially and between subsequent uses to minimize cross-contamination of samples. p One liner from each sample drive was preserved for chemical analysis. These liners sample were covered on each end with teflon sheets , capped with vinyl end covers , and sealed with plastic tape to minimize the loss of volatile constituents. These samples were chilled and transported to Kennedy/Jenks/ Chilton' s Laboratory Division for analysis. Chain of custody forms were maintained throughout sample collection and trans- port. Two soil samples from each boring were selected for chem- ical analysis. Headspace analysis for the presence of organic vapors was also- performed in the field on a separate soil sample from each sam- pler interval . A portion of the soil sample selected for head- space analysis was extruded into a pre--cleaned glass jar which was covered with aluminum foil and allowed to sit in a warm area for five to ten minutes. The head space ( the space in the jar above, thesoil sample ) was then monitored for total organic vapors by inserting the intake tube of a Foxboro Model 128 por- table organic vapor analyzer through the aluminum foil . The maximum organic vapor concentration detected was recorded. Headspace organic vapor monitoring was performed as a- field method for evaluating the presence of petroleum product in soil , as well as a criterion for selecting soil samples for laboratory analysis . Boring logs that describe subsurface lithology using the Unified Soil Classification System, depths of sampled intervals, mea- sured aroundwa ter levels and details of well construction are presented in Attachment B. The first two borings , Bl and B2 , (see Figure 1 ) , were drilled to a depth of 15 feet, which was the depth of the first soil sample collected below the water table. The third boring , B3 , k was drilled to a depth of 20 feet. This was done because head- space monitoring detected organic vapors in the sample from 10 }