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BTEX. . .Benzene, toluene, ethylbenzene, total xylenes <br /> Ppm. . . Parts per million <br /> ppb. . .Parts per billion (1 ppm = 1 ,000 ppb) <br /> N.D. —Not detected above method detection limit <br /> Table 2 <br /> Analytical Results of Grab Water Samples Acquired <br /> at 2360 East Street , Tracy, CA <br /> March, 1994 <br /> TPH-D TPH-G B T E X <br /> Sample No. (ppb) (ppb) (ppb) <br /> ----------------------------------------------------------- <br /> EP-1 N.D. 320 ,000 460 680 900 1400 <br /> EP-2 81 84,000 360 170 480 1100 <br /> EP-3 N. D. 1500 3 . 1 4 . 4 9 . 1 9 . 9 <br /> EP-4 N D. 710 ,000 1500 1200 1000 3600 <br /> -------------------------------------------------------------- <br /> Method <br /> Detection 50 100 0 . 5 0 .5 0 . 5 0 . 5 <br /> Limit <br /> ------------------------------------------------------------ <br /> TPH-D. . .Total Petroleum Hydrocarbons as Diesel <br /> TPH-G. . .Total Petroleum Hydrocarbons as Gasoline <br /> BTEX. . . Benzene, toluene, ethylbenzene, total xylenes <br /> ppb. . . Parts per billion <br /> N.D. . . .Not detected above method detection limit <br /> Arrangements have been made to advance three additional <br /> boreholes beyond the eastern boundary of the subject site <br /> subsequent to receiving written approval for drilling from <br /> the owner of the shopping center upon which the borings are <br /> to be placed. While approval is anticipated, EPM requests <br /> that the Environmental Health Division reconsider its <br /> requirement for these additional borings in consideration <br /> of the following: <br /> 1) The area in question is cross gradient of the <br /> source of contamination. j <br /> 2) The presence of subsurface contamination an the <br /> area of the additional borings will be modeled <br /> as part of the design phase for the groundwater <br /> treatment system scheduled for installation at <br /> the site. <br /> Page 5 <br /> i <br />