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Table 2 <br /> Temporary Well Construction Information <br /> Well IDI, Ground Surface Total Depth Screen Interval <br /> Elevation (msl) (ft) <br /> MW-9 296.92 91.5 70-90 <br /> MW-10 286.33 76.5 65-75 <br /> MW-11 283.27 76.5 64.5-74.5 <br /> After the temporary wells were constructed, the water levels were allowed to <br /> equilibrate for five days to allow measurement of static water levels. <br /> 4.3.2 Temporary Well Sampling <br /> To assess the distribution of VOCs in groundwater, grab samples were collected from <br /> each of the three temporary wells on October 13 and 19, 2011, using disposable <br /> polyethylene bailers. Because temporary well MW-9 exhibited slower recharge, it was <br /> sampled on October 19, 2011. The bailers were lowered down the temporary well <br /> casing using nylon twine. Once filled, the bailers were retrieved, and a bottom- <br /> emptying device was inserted into the bottom of the bailer to transfer the water into <br /> laboratory-supplied 40-milliliter (ml) VOAs with hydrochloric acid preservative. The <br /> filled VOAs were capped and then inverted to check for air bubbles, labeled, and then <br /> placed in a chilled cooler. After all samples were collected, the chain-of-custody form <br /> was completed, and the cooler was delivered to the laboratory courier for transport to <br /> the laboratory. <br /> 4.3.3 Phase I Analytical Results <br /> Samples from the temporary wells were analyzed for VOCs by United States <br /> Environmental Protection Agency (EPA) Method 8260B. The results are summarized <br /> below, and the analytical results and chain-of-custody documentation are presented in <br /> Appendix C. <br /> Table 3 <br /> Phase I Preliminary Analytical Results <br /> VOC Concentrations From Samples Taken October 13 and 19, 2011(µg/[_) <br /> Dichlorodifluoromethane Tetrachloroethene Trichlorofluoromethane <br /> Well ID (DCDFM), (PCE) (TC FM) Total VOC <br /> MW-9 2.1 0.32(trace) 0.61 3.03 <br /> MW-10 0.21(trace) 0.66 0.22(trace) 1.09 <br /> MW-11 2.8 1 1.6 1 0.16(trace) 4.56 <br /> Notes: A trace concentration is one measured between the laboratory's Method Detection Limit(MDL)and <br /> Practical Quantitation Limit(PQL). It is symbolized by a'j"in the laboratory report. <br /> gg/L: micrograms per liter. <br /> EMP Report—Phase II Geo-Logic Page â–  8 <br /> ' Corral Hollow Sanitary Landfill ASSOCIATES <br /> August 21,2012 <br />