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• Clay between 7 and 8 feet Dark-grey , saturated , fine silty sand ccntaining a slight tuel hydrocarbon odor was Present to the bottom of the borehole at 9 feet Groundwater was encountered at approximately 7 feet The soil profile encountered while advanc) ng boring EP-4 coliszsted of 6 inches of concrete and gravel underlain by lxghi-brown mozst silty clay to 3 feet Light brown clay containing ; ;. tt1e moisture was present to approximately 5 5 feet A slight odor , -onsistent with that of fuel hydro- carbons was present bGcween 4 5 anu 5 5 feet Lignt-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 salty sand was present between 6 75 and the bottom of the boring at approximately 8 5 feet The hydrocarbon-lake 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 Subsurface Soil Samples Acquired at 2360 East Street , Tracy , 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 FP-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 1 4 31 9 4 39 63 EP-4 @ 7 ' 8 5 3300 8100 9300 13000 51000 -- -- ------------ ------------------------------------------- Method Detection 1 1 5 0 5 0 5 0 5 0 1emit ----------------------------------------------------------- 7kn o11 not identified by the laboratory , was observed 40 while advancing EP-I Page 4