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2-5 <br /> `-' At least one sample from each boring will be submitted to a subcontracted analytical Tabora- <br /> tory for the analysis of benzene, ethylbenzene, toluene, and xylene (BTEX), total petroleum <br /> hydrocarbon (TPH)-gasoline fraction, and lead. BTEX analyses will be completed using <br /> U.S. Environmental Protection Agency (EPA) SW-846, Method 8020, TPH-gasoline fraction <br /> by Method 8015, and lead by SW-846, Method 6010. <br /> 2.3.2 Brine Solution Discharge Area <br /> To determine if soils in the brine solution discharge area have been impacted by the past dis- <br /> charges, Remcor anticipates advancing two soil borings (SB-4 and SB-5) (Figure 3). The <br /> first boring will be advanced to a depth of approximately 30 feet and the second to depth of <br /> ~ 20 feet. Split-barrel samples will be collected continuously for visual identification. Sam- <br /> Y� <br /> ples for laboratory analyses will be collected at the ground surface, at a depth of 10 feet, and <br /> at a depth of 20 feet. One additional analytical sample will be collected at the first observed <br /> lithologic change and/or the surface of the water table. Samples submitted to the analytical <br /> laboratory will be analyzed for the Resource Conservation and Recovery Act (RCRA) metals, <br /> hexavalent chromium, and ammonia. <br /> 2.3.3 Septic Leachfield <br /> Remcor anticipates advancing two soil borings (SB-6 and SB-7) (Figure 2) to determine if <br /> fluids entering the Machine Room floor drain have impacted the leachfield of the septic sys- <br /> tem. The fust boring will be advanced to a depth of 25 to 30 feet and the second boring will <br /> :- be advanced to a depth of approximately 15 feet. An analytical sample will be collected <br /> from each boring approximately 5 feet the leach bed piping, unless a low-permeability layer <br /> is encountered at a more shallow depth below the piping, in which case a sample will be col- <br /> lected at that contact. Each soil sample will be analyzed for TPH-diesel fraction, the Target <br /> •— Compound List (TCL) volatile organic compounds (VOCs), ammonia, and total and hexava- <br /> lent chromium. <br /> :2"47 <br />