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<br /> December 29, 2016 | Page 3 File No. 0504-119-00 <br />bgs. A temporary well screen was set between 6½ and 8½ feet bgs, and a groundwater sample was <br />collected. <br />■ Soil boring B-4 was drilled approximately 25 feet northwest of the former UST excavation. B-4 was <br />advanced to a depth of 8½ feet bgs before meeting refusal, and soil samples collected at the 3- and <br />6-foot-depth intervals for potential chemical analysis. Groundwater was not encountered. <br />■ Soil boring B-5 was drilled approximately 10 feet northeast of the former UST excavation. B-5 was <br />advanced to a depth of 9 feet bgs before meeting refusal. Soil samples were collected at the <br />1½-, 4½- and 8-foot-depth intervals for potential chemical analysis. Groundwater was encountered at <br />about 7½ feet bgs. A temporary well screen was set between 7 and 9 feet bgs, and a groundwater <br />sample was collected. <br />■ Soil boring B-6 was drilled approximately 20 feet east of the former UST excavation. B-6 was advanced <br />to a depth of 9½ feet bgs before meeting refusal. Soil samples were collected at the 3-, 6- and <br />8-foot-depth intervals for potential chemical analysis. Groundwater was not encountered. <br />■ Soil boring B-7 was drilled approximately 20 feet northwest of the former UST excavation. B-7 was <br />advanced to a depth of 8 feet bgs before meeting refusal. Soil samples were collected at the 2- and <br />6-foot-depth intervals for potential chemical analysis. Groundwater was not encountered. <br />Environmental West backfilled each boring with bentonite. Excess soil cuttings and temporary well purge <br />water were removed and disposed by Environmental West. Boring logs associated with the borings are <br />included in Appendix A. <br />4.2. Subsurface Conditions <br />Observed soil conditions varied within the borings with clay with sand, silty sand, silty gravel, fine to coarse <br />gravel with silt, clay with gravel, and silt with sand encountered. In general, coarse material (sand and <br />gravel) was present in most borings to depths between 2 and 5 feet bgs and underlain by fine materials <br />(clay and silt) to the depths explored. Groundwater was encountered in four borings between 4½ and 8 feet <br />bgs. <br />4.3. Field Screening and Sampling <br />Soil samples from each boring were field-screened for the potential presence of petroleum contamination <br />by PID, visual examination and water-sheen testing. PID headspace vapor readings were measured above <br />1 part per million (ppm) in borings B-1, B-2 and B-5. Contaminated soil field screening indicators were also <br />observed in collected soil samples from borings B-1, B-2 and B-5. A slight to moderate sheen was noted, <br />as well as, a slight petroleum odor. Field screening procedures are further described in Appendix A. <br />One soil sample per slip-sleeve sampler was collected in laboratory-supplied containers for chemical <br />analysis. Soil and groundwater sampling procedures also are described in Appendix A. <br />5.0 CHEMICAL ANALYTICAL RESULTS <br />5.1. Soil Chemical Analytical Results <br />Seven soil samples were submitted to TestAmerica for the chemical analyses described in “Section 3.0 <br />Scope of Services.” Submitted samples from the seven borings were collected between 4 and 8 feet bgs.