Laserfiche WebLink
e <br /> Mr.Wiiliarn Rauch <br /> Aprii 30. 1996 <br /> Page 3 <br /> FIELD WORK AND OBSERVATIONS <br /> Methods used to drill, sample, and log the soil borings are described in Attachment A. Soil boring <br /> SB-1 was located on the north side of the office building, approximately half way between North <br /> Tracy Boulevard and the parking area; soil boring SB-2 was advanced near the northeastern corner <br /> of the office building (Figure 2). Beneath the lawn and topsoil, material encountered in the upper <br /> three feet of both soil borings consisted of dark olive brown, moist, moderately plastic silty clay. <br /> Between 3 and 10 feet (the total depth of this boring) of the surface, a similar horizon containing <br /> sand stringers r/4- to r/z-inch thick was present. Ground water was encountered in both soil borings <br /> at a depth of approximately 9 feet below grade. Petroleum product staining was not observed in any <br /> of the recovered soil samples. A soil boring log describing soil conditions encountered in soil <br /> borings SB-1 and SB-2 is contained in Attachment B. <br /> Soil samples were collected from each soil boring using an impact sampler containing brass sample <br /> tubes 2 inches in diameter by 6 inches long. After retrieval of the sampling assembly, the stainless <br /> steel tubes containing the sample were removed. One tube from each sampling interval was <br /> immediately capped using a Teflon-lined cap, and placed on ice, for potential submittal to the <br /> analytical laboratory. The deepest sample collected from each soil boring was eventually designated <br /> for laboratory analysis. <br /> Ground water samples were collected by bailing ground water from each soil boring using laboratory <br /> cleaned, dedicated clear plastic bailers. The recovered ground water did not contain petroleum <br /> product odors or a sheen. <br /> After the total depth of each soil boring was reached and after ground water samples were collected, <br /> both soil borings were abandoned by filling completely with a mixture of Portland cement and 5% <br /> bentonite. The abandonment and grouting procedures were approved by Ms. Mary Meays of San <br /> Joaquin County. <br /> RESULTS OF LABORATORY ANALYSES <br /> A total of two soil samples (one from each soil boring) and two ground water samples were . <br /> submitted for laboratory analysis of: <br /> • TPHg.using EPA Method 8015-modified. <br /> • BTEX using EPA Method 8020. <br /> • Organochlorine pesticides using EPA Method 8080. <br /> r <br /> i <br />