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FIELD INVESTIGATION <br /> Based on site conditions as disclosed through research and <br /> reconnaissance, a total of four exploratory borings were drilled at <br /> the site (sec Figure 2). One of these oorings ?S-R) was drilled <br /> north of the easternmost product island, and one of the borings (S-B) <br /> was drilled north of the westernmost product island. Borings S-1 and <br /> S-2 were drilled northweoti and south of the tank complex, <br /> respectively) Boring S-2 was also located immediately north of the <br /> middle product island. Borings S-1 and S-2 both extended to S0.5 <br /> feet in depth. These borings encountered ground water and were <br /> converted to ground-water observation wells. Detailed descriptions <br /> of the field procedures and boring logs are included in Appendix A. <br /> Re us lts <br /> 2 The four exploratory borings drilled at the site encountered similar <br /> y conditions. The site it, underlain primarily by clayey sand to sandy <br /> 1 clay (which contains occe5ional poorly graded sand interbeds) to a <br /> depth of approximately 70 feet (the total depth of Borings S-A and <br /> 5-8). Below this depth. Borings S-1 and S-2 encountered interbedded <br /> sand and clay to a depth of approximately 30 feet, clay to a depth of <br /> approximately 40 feet, then clay and sand or clayey sand to the total <br /> depth explored of 50.5 feet. <br /> Ground water was encountered in Borings S-1 and 5-2 at a depth of <br /> approximately 40 feet. The ground water level stabilized at depths <br /> ! of approximately 38.5 feet. . With only two wells at the site, the <br /> .} site gradient cannot be calculated. However, it is assumed that <br /> ground water is moving in the direction of regional flow, to the <br /> northwest. <br /> ANALYTICAL RESULTS <br /> Selected soil samples were analyzed for total hydrocarbons according <br /> i to GPA Method 413.2. The groundwater samples from the Observation <br /> wells were analyzed for volatile organic compounds, including <br /> f benzene, toluene and xylenes (BTX), according to EPA Method SO2. <br /> Various other samples were analyzed for quality assurance/quality <br /> control CQA/RC) purposes, as described below. The analytical <br /> techniques are described in Appendix C. which also contains the <br /> is <br /> 1 Certified Analytical Reports. Table 15unnari:es the analytical <br /> results. <br /> t <br /> , <br /> 1 . <br /> w 100-13.01 <br /> tr <br /> IN Mimi on <br />