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i <br /> 1 <br /> Mr. Ron Valinoti 2 July 25, 1989 <br /> August 18, 1987 Beta Associates drills four soil borings (DH-1 <br /> through DH-4), collects soil samples, and in- <br /> stalls wells in two of the borings <br /> stat l s m g <br /> 9 <br /> (MW-1 and MW-2). The locations of the boreholes <br /> and monitoring wells are shown on Figure I. <br /> f September 21, 1987 Beta f>ssociates reports findings on samples from <br /> DH=2AMW-2'located in the immediate vicinity of:._r. <br /> the underground.diesel storage tanks j <br /> "no diesel was. detected in the ground water <br /> ! sample or the sail sample taken at five feet <br /> below ground surface. Trace amounts of two . <br /> j trihalomethanes, chloroformand bromodi- <br /> chloromethane, were detected in the ground <br /> water sample. These components were present <br /> in concentrations well below the established <br /> ' drinking water standard of 100 ppb combined i <br /> concentration. These components were not s <br /> detected in the soil sample from five foot i <br /> depth. <br /> Additional sample results reported on this date <br /> - . are summarized in Table 1. <br /> March 9, 1989 The 10,000-gallon diesel storage tank is removed <br /> r by Western Meter Service. The location of the <br /> tank excavation is shown on Figure 1, and the ' <br /> dimensions of the excavation are shown on Figure <br /> 1`R 2. Soil samples are collected from each end of <br /> the tank by SCS Engineers and from the water at <br /> r` the base of the excavation. The locations of the _ <br /> soil and water samples are labeled on Figure 2. <br /> Sample results, summarized in Table 1, indicate <br /> ` diesel contamination in the western portion of <br /> the excavation [sample SCS-1 at 350 parts per <br /> million (Ppm)] and in the water at the bottom of <br /> s {; the excavation (sample SCS-3 at 2,400 ppm). A <br /> ' soil sample from the eastern section of the <br />�r7excavation (SCS-2) was non-detect for diesel: i <br /> May 4, 1989 SCS engineers collects a water sample from MW-2 " <br /> r <br /> . (SCS-4 As shown in Table 1, the water sample <br /> r was non-detect for diesel. <br /> i . <br /> ' Comment 2 <br /> ytis Provide scale-drawn cross=sectional-diagrAms-of the excavation area.-This--- -— <br /> will benefit in graphically illustrating the proposed sampling locations. <br /> { <br /> s n®ftneEnvironmental <br /> s <br /> s � <br /> - <br /> r <br />