ARCHIVED REPORTS XR0006801 - Laserfiche WebLink

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silty sand containing a slight fuel hydrocarbon odor was present to the bottom of the borehole at 9 feet . Groundwater was encountered at approximately 7 feet . ,t The soil profile encountered while advancing boring EP-4 consisted of 6 inches of concrete and gravel underlain by light-brown, moist silty clay to 3 feet . Light brown clay containing little moisture was present to approximately 5 . 5 feet . A slight odor, consistent with that of fuel hydro- carbons was present between, 4 . 5 and 5 . 5 feet . Light-olive colored compacted clay was encountered at 5 . 5 feet and continued to approximately 6 . 75 feet . The hydrocarbon-like odor was intense in this interval . Dark-grey, fine silty sand was present between 6 . 75 and the bottom of the boring at approximately 8 . 5 feet . The hydrocarbon-like odor was also intense in this interval . Groundwater was encountered at approximately 7 8 feet . Certified laboratory analyses of discrete soil and grab water samples from each of the ten borings advanced on site revealed the presence of detectable concentrations of fuel hydrocarbon compounds . The results of these analyses are summarized in Tables 1 and 2 : Table 1 Analytical Results of SubsurfaceSail Samples Acquired at 2360 East Street , racy, CA March, 1994 Sample No. TPH-D TPH-G B T E X and Depth (ppm) (ppm) - (ppb) -- EP-1 @ 5 ' N.D. N.D. 12 N.D. 14 22 EP-1 @ 6 . 5 ' N.D 25 25 54 74 120 EP-2 @ 5 ' N.D. N.D. N.D. N.D. N.D. 7 . 5 EP-2 @ 7 ' 6. 8 220 1600 1200 2900 5300 EP-3 @ 5 ' 6. 7 N.D. N.D . N.D. N.D. N. D. EP-3 @ 8 ' N D. N. D. N.D. N.D. N D. 5 7 EP-4 @ 5 ' N D. 4 9 . 4 EP-4 @ 7 ' 8. fi 33 8.10 9,300 6Z)� ----------------------------------------------------------- Method Detection 1 1 5 . 0 5 .0 5 . 0 ,01%5 . 0 ^ .00S w% Limit 906 ----------------------------------------------------------- TPH-D. . . Total Petroleum Hydrocarbons as Diesel TPH-G. . .Total Petroleum Hydrocarbons as Gasoline Page 4