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boring were selected for laboratory analysis. The samples <br /> taped end Caps, <br /> were sealed with aluminum f41C, and transported under <br /> refrigerated to approximately <br /> chain-of-custody protocol to Applied Analytical, a DHS <br /> approved laboratory. Soil samples were analyzed for <br /> orp�troieum <br /> toluene, ethylbenzene, xylenes (BTEX), <br /> hydrocarbons as diesel (TPHD) using CPA methods 8020 and <br /> modified 8015, respectively. The analytical results are <br /> summarized in Table 1. Laboratory data sheets <br /> and chain-of- <br /> custody documentation are included in App <br /> endix3.2 Subsurface Conditions <br /> Soils encountered beneath the project site consist of <br /> sand (SP), and clay (CL/CH) to <br /> interbedded silts (MH), <br /> approximately 36 feet: belo,-r grade, the maximum depth explored. <br /> Site stratigraphy is shown in Figure 5. <br /> Groundwater was encountered at approximately 23.0-26,5 feet <br /> below grade in MW1. It did not appear that saturated soils <br /> were encountered in SHl until 32 feet below grade, however, <br /> this may be due to the very stiff, low permeability soils <br /> encountered in the boring. The logs suggest: the first water <br /> in the area is perched above a clay layer at 25-30 feet. <br /> 3.3 Monitoring well Construction <br /> Soil boring MWl was subsequently completed as a groundwater <br /> monitoring well. The monitoring well was installed to assess <br /> the groundwater quality of the shallow water bearing zone <br /> beneath the site. The well location was selected based on the <br /> groundwater flow direction, believed to be northeasterly <br /> I <br /> according to information received from the SJCPHS. <br /> ucted with 2-inch F480 polyvinyl chloride <br /> The well was constr <br /> (PVC) casing. The screened interval of the well was <br /> positioned from approximately 5 feet above to 15 feet below <br /> the first encountered groundwater to allow for seasonal water <br /> level fluctuations. The screen slot size is 0.01 inch. <br /> The boring was advanced with 8-inch outside diameter hallow <br /> stem augers. When the augers were advanced to the desired <br /> depth of the well, the well casing was lowered down heeacenter <br /> of the augers and set to the appropriate depth^ <br /> space between the augers and the screened portionoffilter pack was <br /> the well <br /> was backfilled with Lonestar #2-12 sand• of the screened <br /> extended to approximately 2 feet above the top <br /> placed <br /> clay was <br /> ortioninfthe annular the casr space abovoe thelfilter pack.of bentonio Since the <br /> 4 <br /> SF56A515.-r <br />