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Page 5 <br /> Mr Michael Infurna Jr <br /> June 2, 1998 <br /> where the probeholes were terminated Subsurface lithologies are illustrated in the <br /> cross-section contained in Figure 4 <br /> Based on the thickness and observed confining characteristics of the clay layer, it is not <br /> expected that the depth to groundwater will rise higher than 50 feet, even during "wet" <br /> periods of the year However, groundwater will rise under hydrostatic pressure when <br />' the confining layer is perforated by a well Groundwater in probeholes PH-1 and PH-2 <br /> rose from 50 feet to a depth of 25 feet within several minutes from the penetration of <br />' the confuting layer <br /> Petroleum odors were noted and PID readings were measured in the eight soil samples <br />' collected from probehole PH-1 at depths of 10 feet to 45 feet Petroleum odors and PID <br /> readings were not noted in the probehole PH-2 soil samples, except those collected at <br /> the 30-feet and 40-feet depths The sandy soil and groundwater samples collected from <br /> each probehole at the depth of 50 feet were not noted to contain petroleum odors or PID <br /> measurements <br /> Laboratory Analysis <br /> Soil and groundwater samples were transported chilled and accompanied by chain of <br /> custody documentation to West Analytical Laboratory in Davis, California on April 17, <br /> 1998 Selected soil and both groundwater samples were analyzed for BTEX and TPH-G <br />' using USEPA Methods 8020 and 8015, respectively Soil samples were selected for <br /> analysis based on PID measurements and observed characteristics to assess the profile <br /> of potential petroleum impact <br /> In addition to BTEX and TPH-G, the 45-foot soil sample and the groundwater sample <br /> from probehole PH-1 were analyzed for the oxygenate compounds methyl-tert butyl <br /> ether (MTBE), tert butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether <br /> (ETBE), and tert amyl methyl ether(TAME) using USEPA Method 8260 The <br /> groundwater sample from probehole PH-2 was also analyzed for the previous 5 <br /> oxygenate compounds, plus methanol and ethanol at the direction of Mr Infurna The <br /> methanol and ethanol tests were performed by Kiff Analytical of Davis, California <br /> r <br />