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„s SECTION 3 <br /> y: <br /> SITE INVESTIGATION <br /> SOI.BORING AND SOEL SAMPLING PROCEDURES ` <br /> Three (3) soil borings were installed using 10-inch hollow-stern augers. Boring <br /> locations were described in Section 2 and are shown in Figure 4. Soil borings were <br /> designated as SB-01, SB-02, and SB-03, which correspond to monitoring wells mW-1, <br /> MW-2 and MW-3, respectively. The total depth of each boring was 25 feet below <br /> ground surface (bgs). Total depth was selected based on encountering groundwater at <br /> approximately 15 feet bgs in each well, which allowed construction of monitoring <br /> wens <br /> with 10 feet of screened interval below and 5 feet of screened interval above the water <br /> table. <br /> During soil-boring operations, sail samples were collected at least every five feet in <br /> the unsaturated zone with a split-spoon sampler. Representative portions of the soil <br /> samples were split for head space OVA screening, lithologic description, and laboratory <br /> analysis. Soil samples were collected in brass tubes within the split-spoon sampler. The <br /> ends of each tube were covered with Teflon to and then <br /> Pe capped with plastic caps. The <br /> caps were sealed with duct tape, at the recommendation of the Public Health Services <br /> representative. <br /> During soil-boring operations,geological descriptions of the soil were made by an on- <br /> site geologist, and soil-boring logs were constructed. These soil-boring logs (witlr <br /> monitoring well construction data)are displayed in Appendix B. <br /> The most c mtaminated soil sample above the water table from each boring was <br /> submitted for laboratory analysis. The most contaminated sample was determined by <br /> field OVA analysi�. For each sampling point, soil was preserved in glass jars filled <br /> approximately 1/2 full, and the jar mouth covered with aluminum foil and then capped. <br /> 3-1 <br /> 175VA5 4/24191 <br />