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- II <br /> d <br /> 1W Harlin Knoll ' <br /> October 19, 1999 <br /> Page 4 of 6 <br /> augered borings HAI and HA4. FID readings from the samples showed concentrations of 3,000 parts per <br /> million (ppm)in borings SBI and SB3,and up to 500 ppm in boring SB2. The highest FID readings were <br /> recorded on samples collected at a depth of 10 feet bgs in each of these borings and attenuatedrapidly' <br /> with depth. FID readings for samples collected from borings SB4 and SB5 were non-detect. Soil boring, <br /> logs are included in Attachment A. <br /> 4.2 Laboratory Analysis <br /> Soil and groundwater samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> methyl text butyl ether (MTBE) using EPA method 8020,E and total petroleum hydrocarbons as gasoline.. <br /> ('TPHg) and diesel (TPHd) using EPA method 8015 modifi�d. Gasoline oxygenate additives were analyzed� <br /> on selected soil and groundwater samples using EPA methodl 8260. <br /> 4.3 Soil Analytical:Results <br /> 4.3.1 Hand Auger Borings <br /> No benzene was detected above the laboratory detectionmits in soil samples collected from any hand <br /> augered soil boring. Borings HAI, HA2, and HA4 contained TPHg, at 330 ppm, 42 ppm, and 230 ppm,j <br /> respectively. Boring HAI also contained TPHd at 96 ppm. No MTBE was detected in any hand angered i <br /> boring using EPA method 8020. However, MTBE was detected in borings HAI and HA4 using EPA i� <br /> method 8260, at concentrations of 2.5 ppm and 0.55 ppm, respectively. No samples collected from borings " <br /> HA2 or HA3 were analyzed for gasoline oxygenate additives using EPA method 8260. Analytical results are <br /> summarized in Table 3. Laboratory reports and chain of custody documentation are included in Attachment <br /> B. <br /> 4.3.2 Direct Push Borin s <br /> G <br /> Soil contamination appeared to be limited primarily to the 1 -foot depth interval in borings SB 1, SB2, and <br /> SB3. TPHg was detected in borings SBI,SB2,and SB3 at 1,100 ppm, 220 ppm and 210 ppm, respectively. <br /> TPHd was present at concentrations of 74 ppm and 440 ppm in borings SB2 and SB3, respectively. Benzene <br /> was detected at 1.6 ppm in the soil sample collected from boiing SB3 at a depth of 10 feet bgs. No benzene it <br /> was detected above laboratory detection limits in any oth30.68 <br /> soil sample. Each sample was analyzed for l� <br /> MTBE using EPA method 8020. MTBE was detected in onone sample,at 26 ppm in the sample collected <br /> from SB3 at 10 feet bgs. However,MTBE was detected in ppm and 37 ppm, respectively, in the 10- <br /> foot depth samples collected from borings SBI and SB3 using EPA method 8260. No other gasoline j` <br /> oxygenate additives were detected in any sample analyzed.1 Borings SB4 and SB5 did not contain. any 11 <br /> petroleum hydrocarbons or gasoline oxygenate additives abovb laboratory detection limits. Analytical results <br /> of soil samples are summarized in Table 3. Laboratory reports and chain of custody documentation are ;l <br /> included in Attachment B. <br /> 4.4 Groundwater Analytical Results <br /> Petroleum hydrocarbons were detected in groundwater sampl s collected from borings SB 1, SB3, SB4, and <br /> SB5. The groundwater sampled collected from boring SB 1 co. tained TPHg at 85,000 parts per billion(ppb), k <br /> benzene at 2,800 ppb, and MTBE at 1,100/930 ppb (EPA 820/8260). The groundwater sample collected <br /> from boring SB3 contained TPHg at 5,000 ppb, benzene at M ppb, and MTBE at 2,200/2,000 ppb (EPA <br /> 8020/8260). Relatively low levels of gasoline constituents were detected in the samples collected from <br /> borings SB4 and SB5, while the sample collected from boring SB2 was non-detect. TPHd was detected only <br /> mmser2lsummary.doe <br />�- 4 <br />