Laserfiche WebLink
1 <br /> silty sand containing a slight fuel hydrocarbon odor was <br /> . present to the bottom of the borehole at 9 feet. <br /> Groundwater was encountered at approximately 7 feet . <br /> The soil profile encountered while advancing boring EP-4 <br /> consisted of 6 inches of concrete and gravel underlain by <br /> light-brown, moist silty clay to 3 feet . Light brown clay <br /> containing little moisture was presents to approximately 5 . 5 <br /> feet . A slight odor, consistent with that of fuel hydro- <br /> carbons was present between 4 . 5 and 5.5 feet . Light-olive <br /> colored compacted clay was encountered at 5 . 5 feet and <br /> continued to approximately 6 . 75 feet . The hydrocarbon-like <br /> odor was intense in this interval . Dark-grey, fine silty <br /> sand was present between 6. 75 and the bottom of the boring <br /> at approximately 8 . 5 feet . The hydrocarbon-like odor was <br /> also intense in this interval . Groundwater was encountered <br /> at approximately 7 . 8 feet . <br /> Certified laboratory analyses of discrete soil and grab <br /> water samples from each of the ten borings advanced on site <br /> revealed the presence of detectable concentrations of fuel <br /> hydrocarbon compounds . The results of these analyses are <br /> summarized an Tables 1 and 2 • <br /> Table 1 <br /> Analytical Results of subsurface Soil Samples Acquired <br /> at 2360 East Street , Tracy, CA <br /> March, 1994 <br /> Sample No . TPH-D TPH-G B T E X <br /> and Depth (ppm) (ppm) (ppb) <br /> EP-1 @ 5 ' N.D. N D. 12 N.D. 14 ---22 <br /> EP-1 @ 6 . 5 ' N.D. 25 25 54 74 120 <br /> EP-2 @ 5 ' N.D. N.D. N.D. N.D. N.D. 7 . 5 <br /> EP-2 @ 7 ' 6.8 220 1600 1200 2900 5300 <br /> EP-3 @ 5 ' 6 .7 N D. N. D . N.D N.D. N D. <br /> EP-3 @ 8 ' N.D. N. D N. D. N.D. N.D. 5 . 7 <br /> EP-4 @ 5 ' N.D. 1 . 4 31 9. 4 39 63 <br /> EP-4 @ 7 ' 8 . 6 3300 8100 9300 13000 51000 <br /> ---------------------------- <br /> Method <br /> Detection 1 1 5 .0 5 .0 5 .0 5 .0 <br /> Llmi.t <br /> ----------------------------------------------------------- <br /> TPH-D. . .Total Petroleum Hydrocarbons as Diesel <br /> TPH-G. . .Total Petroleum Hydrocarbons as Gasoline <br /> Page 4 <br />