Laserfiche WebLink
2.2 Additional Investigation, August 1993 <br /> To further assess the impacted soil in the area of MW-4, two additional borings were drilled, <br /> B17 and B18. Boring B17 was drilled at an angle of 30° from vertical and extended to a <br />' vertical depth of 38 feet. B17 terminated at a depth of 40 feet at a point approximately 5 <br /> feet north of the sidewalk on Harding Way. Boring B18 was drilled to a depth of 40 feet, <br /> approximately 20 feet south of MW-4. MW-5 was installed approximately 20 feet southwest <br /> of MW-3, which was properly abandoned. <br /> Petroleum hydrocarbons were detected in soil samples from B17 and B18 at depths between <br /> 15 and 43 feet. The laboratory results of the soil samples are summarized in Table 1. <br /> TABLE 1 <br /> ANALYTICAL RESULTS oSOIL SAMPLES <br /> Yellow Submari <br />' August 1993 <br /> (mg/kg) <br /> Sample Sample TPH as TPH as Ethyl- <br /> ID Vertical Gasoline Diesel Benzene Toluene benzene Xylene <br /> Depth <br /> B17-18 15.6 450 370 ND 0.17 1.1 3.0 <br /> ' B17-23 19.9 4000 2000 ND 7.3 37 9 <br /> B17-33 28.5 630 99 ND 1.2 6.3 5.2 <br /> 1 B17-43 37.2 2.1 ND ND ND ND 0.013 <br /> B18-25 25 1.2 ND ND ND ND ND <br /> B18-35 35 55 28 ND ND 0.082 0.13 <br /> B18-40 40 ND ND ND ND ND ND <br /> MW-5-40 40 ND ND ND ND ND ND <br /> mgA-8 = parts per million(ppm) <br /> ND=Not Detected <br /> ' 2.3 Additional Groundwater Investigation <br /> Hydrocarbons were detected in groundwater samples from MW-4 and MW-5 during the <br /> ' September 1993 monitoring (see Table 3). No hydrocarbons had been previously detected <br /> in any groundwater samples at this site. Based on these results, GeoAudit determined that <br /> b E S-Ik-,h- 4 <br /> 6]J.WR-4-9UYa-S-I-i- <br />