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3.1.1 Soil Sampling <br /> Drilling was conducted by Exeltech Drilling Company (C57 license #596545) using a hollow <br /> stem auger drill rig An experienced field geologist was present to continuously log all drill <br /> cuttings and soil samples utilizing the Unified Soil Classification System Descriptions of soil <br /> types encountered, sample collection intervals, boring abandonment, and well construction details <br /> were recorded on well/boring logs (Appendix III) Cored soil samples were collected above the <br /> water table at five foot intervals and below the water table at select intervals in accordance with <br /> RESNA's Soil Sampling Protocol (Appendix IV) Soil samples from 5 5 and 10 5 feet below <br /> grade were submitted for laboratory analysis Analysis was conducted for BTEX and TPHG by <br /> 1 Applied Analytical (DHS cert #1211) utilizing EPA methods 8020 and 8015, respectively <br /> Analytical results are summarized on Table 3 Laboratory data sheets and chain-of-custody <br /> documentation are included in Appendix V <br /> To avoid cross-contamination, drilling augers were steam-cleaned before drilling each borehole <br /> Water used to clean the augers was stored in drums approved for hazardous liquid storage and <br /> remains on-site <br /> All soils generated during drilling activities will be aerated along with excavated soils, as <br /> previously described <br /> 3.1.2 Monitoring Well Construction <br /> Soil Borings MW1, MW2, and MW3 were subsequently completed as groundwater monitoring <br /> wells The monitoring wells were installed to assess the extent of groundwater contamination <br /> beneath the site, and to provide measurement points for the determination of groundwater flow <br /> direction and hydraulic gradient Figure 4 shows the locations of the wells <br /> Each well was constructed with 2-inch F480 polyvinyl chloride (PVC) casing The screened <br /> interval of each well was positioned from approximately five feet above to fifteen feet below the <br /> encountered water table to allow for seasonal water level fluctuations The screen slot size is <br /> i0 01 inch <br /> I1,01492 TJL 4 <br />