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1 <br /> Past Site Use: The site was used for dispensing diesel and gasoline fuel. Four above- <br /> ground diesel fuel storage tanks and one underground gasoline storage <br /> tank were present at the site (see Figure 2). <br /> 3.0 PLANNED FIELD ACTIVITIES <br /> 3.1 PRE-FIELD WORK ACTIVITIES <br /> Ground water observation well permits will be acquired prior to drilling. <br /> Underground Service Alert will be notified prior to field activities to mark underground utilities <br /> near the proposed drilling locations. <br /> 3.2 DRILLING, SOIL SAMPLING, 'AND ANALYSIS <br /> Three onsite ground water observation wells will be drilled to depths of approximately 25 feet <br /> below grade (fbg) (Figure 2). The wells will be used as observation wells during aquifer <br /> pumping tests. Drilling will be performed using a 10-inch-diameter hollow-stem auger drill rig. <br /> 77 <br /> Soil samples will be collected continuously for soil description, field hydrocarbon vapor testing, <br /> and possible laboratory analysis. Refer to Appendix A for general field procedures. <br /> Select soil samples will be analyzed for the following: <br /> • total petroleum hydrocarbons as gasoline (TPH-G) and diesel (TPH-D); <br /> • benzene, toluene, ethylbenzene, and total xylenes (BTEX); <br /> • total organic, and fractional organic carbon (TOC & FOC); <br /> • bulk and specific density; and <br /> if. <br /> • sieve analysis. <br /> 3.3 OBSERVATION WELL CONSTRUCTION <br /> Observation wells will be constructed using 4-inch-diameter PVC casing with an expected <br /> screened interval from 5 to 25 fbg. Well construction details and development procedures are <br /> outlined in Appendix A. <br /> 3.4 ELEVATION SURVEY AND FLUID-LEVEL MONITORING <br /> Well top elevations will be surveyed relative to a city benchmark to the nearest 0.01 foot by a <br /> licensed surveyor. Fluid levels in the observation wells will be measured to obtain data <br /> 2 <br /> r <br />