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26 December 1995 <br /> AGE-NC Project No. 95-0118 <br /> Page 4 of 6 <br /> and 602, respectively.The laboratory report and chain-of-custody form are presented in Appendix <br /> D. <br /> 4.0. FINDINGS <br /> 4.1. SOIL PROFILE <br /> Silt and clay were encountered during drilling of MW-4, MW-5 and MW-6 from the surface to a <br /> depth of 10 feet. Interbedded clays and fine-to coarse-grained sands were present in each boring from <br /> 10 to 35 feet. Water was encountered in each boring at a depth of approximately 35 feet bsg. No <br /> samples were collected from any borings at depths in excess of 35 feet; however, auger returns <br /> indicated the presence of silty sands at depths of 40 to 50 feet in each boring. <br /> `. 4.2. FIELD AND LABORATORY RESULTS OF SOIL SAMPLES <br /> Organic vapors were not detected in soil samples collected from MW-4, MW-5 or W-6. Two soil <br /> samples form each boring were submitted to MAI for analysis. Petroleum hydrocarbons were not <br /> detected in any of the soil samples released to MAI for analysis. <br /> 4.3. RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> -: The relative elevation of ground water in each well was calculated by subtracting the ground water <br /> depth from the surveyed relative casing elevation (Table 1). Between May and September 1995, <br /> ground water rose approximately 0.3 feet in each well. In September .1.995, ,ground water flow <br /> direction is divergent from MW-3 to the southwest and northeast. Relative ground water elevation <br /> contours are illustrated in Figure 3, <br /> 4.4. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> 'j TPH-g was detected in water samples from MW-2 and MW-3 at concentrations of 15,000 ppb and <br /> 1,700 ppb, respectively. Volatile aromatic hydrocarbons were detected in the samples from MW-2 <br /> 1 and MW-3 at concentrations ranging from 47 ppb(ethylbenzene,MW-3)to 1,900 ppb (toluene, MW- <br /> 2). Specifically, benzene was detected in groundwater samples from MW-2 and MW-3 at 570 and <br /> 61 ppb, respectively. No detectable concentrations of petroleum hydrocarbons were present in <br /> samples collected from MW-1,MW-4, MW-5 or MW-6. Analytical results of ground water samples <br /> are summarized in Table 2. The laboratory report and chain-of-custody are included as Appendix B. <br /> I <br /> i { <br />